JP2023182508A - Waste water treatment system with flocculation tank to which flocculant is added - Google Patents

Abstract

To improve a technology of agitating flocculant powders in a technology where the flocculant powders are added into waste water, a target material in the waste water is flocculated and solid-liquid separation is performed.SOLUTION: A flocculation device 20 to flocculate a target material in waste water comprises: a flocculation tank 40; and two agitation shafts 104, 104 respectively and parallelly arranged in a posture to extend in an almost vertical direction in the flocculation tank. Each of the agitation shafts rotates matching two or two groups of agitation blades 106, 106 in a same direction and then a downward swirl is formed in the waste water so as to form hollows opening toward a liquid surface. Flocculant powders are charged toward the hollows of the swirl, drawn by the swirl and precipitated toward the bottom 43 of the flocculation tank.SELECTED DRAWING: Figure 14

Description

The present invention is a technology or powder that adds a flocculant to the cleaning water sprayed onto the surface of a structure, which is recovered as wastewater after use, to flocculate the target substance in the wastewater and separate it into solid and liquid. This technology relates to adding particles to a liquid and stirring or mixing the particles.

A wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after use is already known (see Patent Documents 1 to 5, etc.).

This type of wastewater treatment system is configured to include a flocculation device that flocculates target substances in the wastewater into flocs using a powder or granular flocculant added to the wastewater for solid-liquid separation. There are cases.

In that case, the flocculation device is specifically configured to include a flocculation tank, and a flocculant is added to the flocculation tank in order to flocculate the target substance in the wastewater and perform solid-liquid separation. .

Throughout this application, the term "flocculant" is used in a broad sense, and the broader term "flocculant" is replaced by the narrower term "flocculant," "heavy metal insolubilizer," and "adsorbent such as activated carbon." inclusive or inclusive. Definitions of each of these terms are detailed below.

By the way, in certain cases, for example, it has been confirmed that hazardous substances such as lead are present in the existing paint film attached to the base of a structure, and the Ministry of Health, Labor and Welfare has issued a notice dated May 30, 2014. When it is necessary to comply with the notification, buildings (houses, buildings, etc.), steel towers that are elongated structures constructed using steel frame structures (e.g. power transmission towers, communication towers, etc.), civil engineering works etc. In order to repaint the surface of structures such as structures (bridges, etc.), ships, vehicles (automobiles, trains, etc.), airplanes, etc., the existing coating film that has already been applied to the surface of the structure ( A type of construction is performed in which the paint is stripped from the substrate (the substrate) and a new paint is then applied on the same surface of the structure.

Here, there are physical methods and chemical methods as methods for peeling off the existing coating film.

Physical methods include hand tools such as scrapers, electric rotary tools that use electric motors to rotate removal tools such as wire brushes, air rotary tools that use air motors to rotate similar removal tools, and high-pressure water jets. This is a method in which a worker uses a peeling machine or the like to peel off the existing paint film from the structure. In contrast, the chemical method is a method in which a stripping agent containing a chemical is applied to the existing coating film to dissolve or swell the existing coating film, thereby peeling the existing coating film from the structure. This method is also called a wet coating removal method using a coating stripping agent, that is, a wet stripping method.

When employing the wet stripping method, cleaning water is sprayed onto the surface of the structure to clean the surface of the structure after the stripping agent is applied to the surface of the structure. Since the washing water may contain harmful substances, it is desirable to collect it as wastewater and treat it after use.

In short, the wet paint film removal method described above uses a remover to remove the existing paint film from the surface of a structure using a brush, a brush, a roller, a sprayer, an air spray gun, an airless sprayer, etc. The method includes a coating step of coating the surface of the structure using an applicator such as a gun. The method further includes a cleaning step of spraying cleaning water onto the surface of the structure to clean the surface of the structure after application thereof. The method further includes a wastewater treatment step of recovering and treating the injected wash water as wastewater after its use.

For the wastewater treatment process, the wastewater is put into a flocculation tank, and a powder or granular flocculant is added to the wastewater, whereby the target substances in the wastewater are flocculated as flocculation flocs. Flock is separated from the wastewater.

Regarding this wastewater recovery treatment, there are several requests from the viewpoint of environmental protection, as follows.

1. Harmful substances mixed in the cleaning water after stripping and cleaning as wastewater (or waste liquid) (for example, those contained in the existing paint film, those contained in the plating layer of the base of the structure, and those eluted into the cleaning water) to detoxify wastewater by separating and removing substances including

2. To reuse the detoxified wastewater as new cleaning water.

Against this background, prior to the present invention, the present inventor developed a technology to collect and treat the cleaning water sprayed onto the surface of a structure after application of a release agent as wastewater, and obtained a patent for the technology. No. 6853599 was obtained. This patent publication is cited as Patent Document 1 in this specification.

Furthermore, Patent Documents 2-5 disclose that a flocculant is added to wastewater, the flocculant is stirred using a stirrer, and target substances (for example, harmful substances) in the wastewater are treated (for example, by using a flocculation tank). Discloses technology for coagulation-sedimentation treatment, coagulation-sedimentation treatment, separation treatment using a separation tank, etc.). Each of these documents discloses a conventional example of a technique for dispersing powder in a liquid.

Here, as a stirrer, for dispersing powder in a liquid, there are, for example, a rotary type that rotates stirring blades in the liquid, and an air bubble type that uses a pump to inject air bubbles into the liquid. be. Examples of rotary stirrers include an electric motor type using an electric motor driven by electricity, and an air drive type using an air motor driven by compressed air.

Further, Patent Document 6 discloses a technique in which a powdery material (powder, powder, etc.) or a granular material is stirred using a rotating sieve and then dispersed and added to an object. This document discloses a conventional example of a technology for dispersing powder in air.

Here, for example, there are sieves that are used in a stationary state, and sieves that are used in a dynamic state where reciprocating rotation, vibration, or sound waves are generated.

Further, Patent Document 7 discloses a technique in which a liquid flocculant, that is, a flocculating liquid agent is stirred using a stirrer and added to industrial wastewater.

Specifically, the stirrer includes a stirring shaft having a hollow housing and a plurality of stirring blades attached to the stirring shaft. The hollow housing has an axial hole coaxial therewith for passage of the flocculating liquid.

The stirring shaft has a liquid inlet at the upper end of the axial hole into which the flocculating liquid is injected, and further has a plurality of through holes radially penetrating the hollow housing at a downstream portion thereof. They are arranged in a line in the direction. The flocculating liquid agent injected into the stirring shaft from the liquid inlet is discharged into the industrial wastewater from the plurality of through holes during stirring.

Further, Patent Document 8 discloses a technique in which cleaning water sprayed onto the surface of a structure is collected as waste water after use, treated, and reused.

Specifically, this document discloses a flocculation device that performs sedimentation separation on the wastewater using a flocculant. This document discloses a conventional example of the flocculation device, in which the wastewater is injected into a filter cloth bag together with an aqueous flocculant solution, the wastewater is subjected to sedimentation separation, and then the wastewater is The filtered water is filtered using a filter cloth bag, and the treated water is pumped up and reused using a pump instead of a drain.

Patent No. 6853599 Japanese Patent Application Publication No. 2006-0007176 Japanese Patent Application Publication No. 2020-0025919 Japanese Patent Application Publication No. 2020-0065964 Japanese Patent Application Publication No. 2000-0325704 Publication No. 58-077638 China Utility Model No. 210764511 Utility Model Publication No. 7-24497

The inventor subsequently conducted various tests and conducted various research and developments in order to improve the practicality of the developed wastewater treatment technology.

As a result, the present inventor realized that it is important to satisfy the following several requirements in order to improve the practicality of the wastewater treatment technology.

1. On-site wastewater treatment and portability of equipment for this purpose

Regarding wastewater treatment, there are two types of treatment: the carry-in treatment method, in which wastewater is transported from the site where it is generated to a treatment facility in another location, and treated there, and the on-site treatment method, in which the wastewater is treated on-site.

On the other hand, from a worker's perspective, it is important to easily, quickly, and efficiently carry out the entire process from paint film removal (removal agent application) to paint film cleaning and wastewater treatment on-site. It is also important from the perspective of the person who owns or manages the property.

Therefore, regarding the work of wastewater treatment, there is a demand for transporting wastewater treatment equipment to the site and treating the wastewater there simply, quickly, and efficiently.

2. Maximizing the flocculating effect of the flocculant, that is, optimizing the dispersion state

In wastewater treatment, a flocculant is added to the wastewater and then the wastewater is stirred to disperse the flocculant in the wastewater.

By the way, in the field of wastewater treatment, flocculants are solid while wastewater is liquid, so flocculants are used for stirring solid-liquid dispersion systems. In this case, the purpose of stirring the flocculant is, for example, mainly the movement of particles, specifically, the dispersion of particles (preventing sedimentation or flotation, or dispersing without forming lumps). It is in. Proper dispersion of the particles means that the particles have been uniformly stirred.

However, if the agitation of the flocculant is poor, the flocculant cannot be thoroughly dispersed throughout the wastewater, making it difficult for the flocculant to fully exert its flocculating effect, resulting in unnecessary waste of flocculant and Work time may also be consumed. When using a flocculant, it is important to consider how to stir the flocculant with high stirring ability (stirring efficiency, etc.) and how to thoroughly disperse it throughout the wastewater.

Here, "stirring capacity" or "stirring efficiency" refers to the total time (man-hours, etc.) required for uniform stirring of particles such as flocculants (e.g., achieving a target particle dispersity or particle density) and the energy consumed. It is quantified as a value divided by equipment size, equipment cost, etc.

Therefore, in the work of wastewater treatment, there is a need to maximize the flocculating effect by effectively stirring the flocculant and completely dispersing it throughout the wastewater.

3. Normalization of paint film removal work when reusing treated water

The wastewater after treatment is separated into treated water and coagulated flocs, and the treated water may be reused for paint film removal, which is one example of its use. For example, in that case, the presence of unexpected residues in the treated water may impede paint film removal. Such residual substances are, for example, other substances added to the wastewater in order to suppress phenomena occurring unexpectedly during stirring of the wastewater.

Therefore, regarding the work of wastewater treatment, there is a desire to perform the paint film removal work normally when the treated water generated by the treatment is reused for the paint film removal work.

4. Preventing clogging of the drain when wastewater that has been subjected to the treatment of agglomeration in the filter bag and filtration through the filter bag is discharged from the flocculation tank using the drain.

The wastewater treatment system may be configured to include a flocculation device that flocculates the wastewater using a flocculant. In this case, the flocculation device includes a flocculation tank that can contain the wastewater and has a drain at the bottom, and a filter bag installed in the flocculation tank, and the water is poured into the filter bag. In the process of draining the wastewater from the drain, the drain may be configured to filter the wastewater.

In embodiments in which these possibilities are realized, the portion of the bottom of the filtration bag facing the drain can cause clogging of the drain, either alone or in combination with flocs present in the filtration bag. There is sex.

Therefore, when it comes to wastewater treatment, it is important to prevent the drain at the bottom of the flocculation tank from clogging and to properly discharge the treated wastewater from the flocculation tank or transfer it from the flocculation tank to another downstream tank. There is a request.

Some of the demands explained above are not limited to the specific use of wastewater treatment, but also exist for other uses, such as adding granular material to a liquid and stirring or mixing it.

In view of these circumstances, the present invention aims to add a flocculant to the cleaning water sprayed onto the surface of a structure and collected as wastewater after its use to flocculate target substances in the wastewater. In the solid-liquid separation technology, improving the technology of stirring the flocculant, and/or improving the technology of adding powder or granular material to a liquid and stirring or mixing it. This was done as a challenge.

In order to solve the problem of improving the technique of stirring a flocculant, according to one aspect of the present invention, a wastewater system is provided for recovering and treating the cleaning water sprayed onto the surface of a structure as wastewater after its use. A processing system,
comprising a flocculation device that flocculates the target substance in the wastewater and separates solid and liquid,
The flocculation device is
a coagulation tank containing the wastewater;
an addition stirring unit that stores a flocculant outside the flocculation tank, adds the contained flocculant to the wastewater in a dispersed manner, and stirs the added flocculant inside the flocculation tank;
a movement mechanism that allows the addition stirring unit to move relative to the flocculation tank in plan view, thereby enabling the dispersion of the flocculant to the wastewater;
and a stirrer that stirs the added flocculant in the coagulation tank by rotation of a stirring blade.

In order to solve the same problem, according to another aspect of the present invention, there is provided a wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after its use, comprising:
A flocculation device that flocculates target substances in the wastewater as flocs using a powdery or granular flocculant added to the wastewater to separate solid and liquid,
The flocculation device is
a coagulation tank containing the wastewater;
two first stirring shafts, each of which is arranged in parallel with a longitudinal gap extending substantially vertically in the aggregation tank in a posture extending substantially vertically;
The first stirring shafts rotate two or two groups of first stirring blades corresponding to each other in the same direction, thereby creating a downward swirl in or around a portion of the wastewater that corresponds to the gap. produced to have a depression opening to the liquid level of the wastewater,
A wastewater treatment system is provided in which the flocculant is dropped towards the recess of the vortex and is then drawn in by the vortex and settled towards the bottom of the flocculation tank.

In order to solve the problem of improving the technique of adding powder or granular material to a liquid and stirring or mixing, according to one aspect of the present invention, a powder or granular material is added to a liquid and stirred or mixed. an agitation/mixing system comprising:
a tank containing the liquid;
one stirring shaft or a plurality of stirring shafts arranged close to each other in parallel, arranged in a posture extending substantially in the vertical direction in the tank;
Rotating the one or more stirring shafts and rotating stirring blades coaxially therewith, thereby creating a depression in the liquid contained in the tank that opens a downward spiral to the surface of the liquid. generate to have,
The powder or granular material is dropped toward the recess of the spiral,
A powder agitation/mixing system is provided in which the dropped powder is drawn into the vortex and settled toward the bottom of the tank.

In order to solve the same problem, according to another aspect of the present invention, there is provided a granular material stirring/mixing method in which granular material is added to a liquid and stirred or mixed,
By rotating one stirring shaft or a plurality of stirring shafts arranged close to each other in a substantially vertical direction within the tank containing the liquid, and rotating the stirring blade coaxially with the stirring shaft, the inside of the tank is a step of generating a downward spiral in a liquid contained in the liquid so as to have a depression opening to the surface of the liquid;
a dropping step of dropping the granular material toward the depression of the generated swirl;
There is provided a method for stirring/mixing powder and granular material, which includes a settling step of drawing the dropped powder and granular material into the swirl and settling it toward the bottom of the tank.

According to one aspect of the present invention, in order to solve the problem of improving the technology of performing sedimentation separation in a filtration bag in a coagulation tank and filtration of wastewater using the filtration bag, according to one aspect of the present invention, a method in which wastewater is sprayed onto the surface of a structure is provided. A wastewater treatment system for collecting and treating washed water as wastewater after its use,
A flocculation device that flocculates the target substance in the wastewater using a flocculant and separates the wastewater into solid and liquid,
The flocculation device is
a flocculation tank capable of accommodating the wastewater and having a drain at the bottom thereof;
A filtration bag installed in the flocculation tank, which filters the wastewater injected into the filtration bag in the process of being drained from the drain;
a spacer placed on the upper surface of the bottom of the flocculation tank, the spacer pushing away at least a portion of the bottom of the filtration bag facing the drain upwardly from the drain, thereby preventing clogging of the drain; A wastewater treatment system is provided that includes: and.

The following aspects can be obtained by the present invention. Each aspect is divided into sections, each section is numbered, and the numbers of other sections are cited as necessary. This is to facilitate understanding of some of the technical features that can be adopted by the present invention and their combinations, and the technical features that can be adopted by the present invention and their combinations are limited to the following aspects. It should not be interpreted as such. That is, it should be interpreted that technical features not described in the following embodiments but described in this specification may be appropriately extracted and adopted as technical features of the present invention.

Furthermore, it should be noted that the description of each section in the form of quoting the numbers of other sections does not necessarily prevent the technical features described in each section from being separated and independent from the technical features described in other sections. It should be interpreted that the technical features described in each section can be made independent as appropriate depending on the nature of the technical features described in each section.

(1) A wastewater treatment system for collecting and treating cleaning water sprayed onto the surface of a structure as wastewater after its use,
A flocculation device that flocculates target substances in the wastewater as flocs using a powdery or granular flocculant added to the wastewater to separate solid and liquid,
The flocculation device is
a flocculation tank for accommodating input wastewater, in which when the flocculant is added to the contained wastewater, the target substance is flocculated to produce flocculated flocs;
The flocculant is stored outside the flocculation tank before being added to the wastewater, and the contained flocculant is dispersed and added to the wastewater, whereby the flocculant is dispersed in the air, and the flocculant is dispersed in the air. an addition stirring unit that stirs the flocculant in the flocculating tank, thereby dispersing the flocculant in the liquid;
The addition stirring unit is capable of moving in plan view (e.g., horizontally translating) relative to the flocculating tank during the dispersed addition of the flocculant to the wastewater, and a moving mechanism that enables the dispersion of the flocculant into the wastewater as another aerial dispersion of the flocculant;
The added flocculant is stirred by the rotation of a stirring blade in the flocculation tank, which is provided as a part of the addition stirring unit and/or separately from the addition stirring unit, and thereby the flocculant liquid is stirred. and at least one agitator for dispersion.

(2) The movement mechanism is such that the addition stirring unit moves one-dimensionally or two-dimensionally in plan view relative to the flocculating tank during addition of the flocculant to the wastewater. The wastewater treatment system according to item (1).

(3) The addition stirring unit includes:
frame and
a container attached to the frame for dispersing and discharging the input flocculant and adding it to the wastewater;
At least one first stirring blade is mounted on the frame and rotates in order to stir the flocculant added to the wastewater without using air bubbles in the flocculation tank, thereby stirring the flocculant added to the wastewater without using air bubbles. at least one first stirrer that performs dispersion in the liquid,
The at least one first agitator is configured to cause the at least one first stirring blade to rotate and translate in translation relative to the aggregation tank while the addition stirring unit is moving relative to the aggregation tank. The wastewater treatment system according to item (1) or (2), wherein the flocculant is dispersed in the liquid by both rotation and translation.

(4) The container is a hopper that discharges the introduced flocculant downward or to the side,
A wastewater treatment system according to clause (3), wherein the hopper optionally comprises a sieve for manually or automatically dispersing the flocculant.

(5) The wastewater according to any one of items (1) to (4), wherein the addition stirring unit is manually or automatically moved relative to the coagulation tank along a spiral or zigzag path. processing system.

(6) The flocculation tank is assigned a movable range in which the addition stirring unit is movable and a non-movable range in which the addition stirring unit is not movable in plan view,
The wastewater treatment system further includes rotating at least one second stirring blade attached to the flocculating tank to stir the added flocculant without using air bubbles, thereby rotating the added flocculant. at least one second stirrer that performs dispersion of the coagulant in the liquid in addition to the dispersion of the flocculant in the liquid by the at least one first stirrer,
Items (1) to (5) above, wherein the at least one second agitator is attached such that the at least one second agitating blade is located in the immovable range of the aggregation tank in plan view. A wastewater treatment system according to any of the above.

(7) The moving mechanism includes:
a first moving unit attached to a tank body of the flocculation tank and movable in a first direction relative to the tank body;
a second moving unit attached to the first moving unit and movable in a second direction intersecting the first direction relative to the tank;
The wastewater treatment system according to any one of items (1) to (6), wherein the second moving unit is equipped with the addition stirring unit.

(8) The wastewater treatment system according to item (6), wherein the at least one first agitator and the at least one second agitator generate mutually different flow patterns by rotation of each stirring blade.

(9) The at least one first agitator and the at least one second agitator generate mutually different flow patterns as to whether they are axial flow or swirling flow by rotation of each stirring blade. The wastewater treatment system described in (6).

(10) In a side view of the addition stirring unit, the at least one first stirrer includes two first stirrers that face each other and extend downward across the container (3) The wastewater treatment system according to any of item 9).

(11) The wastewater treatment system according to item (10), wherein the two first agitators rotate their respective first stirring blades in opposite directions.

(12) the at least one second agitator includes two second agitators,
These second agitators are arranged so as to be staggered with respect to the flocculation tank in plan view, and thereby, in the flocculation tank, in plan view, the second agitators cooperate with each other to improve the inner wall surface of the flocculation tank. The wastewater treatment system for wet paint film stripping according to any one of items (6) to (11), which generates a unidirectional circulating flow along.

(13) The at least one first stirrer has a motor that rotates the first stirring blade, and the motor is driven by compressed air rather than electricity. Wastewater treatment system as described in.

(14) The at least one second stirrer has a motor that rotates the second stirring blade, and the motor is driven by compressed air rather than electricity. Wastewater treatment system as described in.

(15) Furthermore,
A bag-shaped flexible floc trapping net placed in the flocculation tank so as to partition the inner space into an outer space and an inner space to prevent water in the wastewater from leaking out as treated water. Items (1) to (14) include those that are capable of capturing coagulated flocs generated in the wastewater while allowing the flocs to settle and float selectively in the flocculation tank. A wastewater treatment system according to any of the above.

(16) The floc-trapping net is allowed to settle in the flocculation layer before adding the flocculant to the wastewater, and is floated from the flocculation tank after the flocs are formed, so that the flocculation net is separated into the treated water leaking from the floc trapping net and the flocs trapped and remaining in the floc trapping net, so that the floc trapping net functions as both the flocculation stage and the separation stage. The wastewater treatment system according to item (15), which is used for.

(17) The wastewater treatment system according to item (15) or (16), wherein the addition stirring unit is moved in a range inside the floc trapping net in plan view.

(18) The addition stirring unit is equipped with at least one first stirrer,
The at least one first stirrer is arranged such that its first stirring blade is located inside the floc trapping net in plan view,
The wastewater treatment system according to item (17), wherein at least one second stirrer is arranged such that its second stirring blade is located outside the floc trapping net in plan view.

(19) The addition stirring unit is equipped with at least one first stirrer,
The at least one first stirrer is arranged so as to be located inside the floc trapping net in plan view,
The wastewater treatment system according to any one of (15) to (18), wherein at least one second agitator is arranged so as to be located inside or outside the floc trapping net in plan view.

(20) The floc trapping net is made of a flexible material and does not have the ability to self-retain its own shape, but by being at least locally reinforced by the three-dimensional frame, its shape is substantially maintained. The wastewater treatment system according to any one of items (15) to (19), wherein the wastewater treatment system is maintained as follows.

(21) Items (15) to (20) in which the floc trapping net is attached to the frame so as to extend over at least the bottom and side surfaces of the frame, thereby forming a floc trapping cage. A wastewater treatment system according to any of the above.

(22) The flocculation device can be transported to the site where the wastewater is generated in an assembled state, or can be transported to the site in an unassembled state and assembled at the site. The wastewater treatment system according to any one of items (1) to (21), which is capable of.

(23) The addition stirring unit includes:
frame and
a container attached to the frame for dispersing and discharging the input flocculant and adding it to the wastewater;
at least one agitator mounted on the frame and extending generally downwardly from the frame to agitate the flocculant added to the wastewater within the flocculation tank without the use of air bubbles; including parts that are not driven by a motor;
The at least one stirring member is moved in translation relative to the flocculation tank in a state in which the addition stirring unit is moved relative to the flocculation tank, and the translational movement agitates the wastewater, thereby causing the The wastewater treatment system according to any one of items (1) to (22), which performs dispersion of a flocculant in a liquid.

(24) A wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after its use,
A flocculation device that flocculates target substances in the wastewater as flocs using a powdery or granular flocculant added to the wastewater to separate solid and liquid,
The flocculation device is
a flocculation tank for accommodating input wastewater, in which when the flocculant is added to the contained wastewater, the target substance is flocculated to produce flocculated flocs;
A bag-shaped flexible floc trapping net is placed in the flocculation tank so as to partition the internal space into an outer space and an inner space to prevent water in the wastewater from leaking out as treated water. A wastewater treatment system comprising: a wastewater treatment system capable of capturing coagulated flocs generated in the wastewater while allowing the flocs to settle and float selectively in the coagulation tank.

(25) The floc-trapping net is allowed to settle in the flocculation layer before adding the flocculant to the wastewater, and is floated from the flocculation tank after the flocs are formed, so that the flocculation net is separated into the treated water leaking from the floc trapping net and the flocs trapped and remaining in the floc trapping net, so that the floc trapping net functions as both the flocculation stage and the separation stage. The wastewater treatment system according to item (24), which is used for.

(26) A flocculation device that flocculates a target substance in wastewater to separate solid and liquid,
a flocculation tank that accommodates wastewater;
an addition stirring unit that stores a flocculant outside the flocculation tank, adds the contained flocculant to the wastewater in a dispersed manner, and stirs the added flocculant inside the flocculation tank;
a movement mechanism that allows the addition stirring unit to move relative to the flocculation tank in plan view, thereby enabling the dispersion of the flocculant to the wastewater;
and a stirrer that stirs the added flocculant in the flocculation tank by rotating a stirring blade.

(27) The wastewater treatment system cleans the surface of the structure after the stripping agent is applied to the surface of the structure in order to strip the existing paint film from the surface of the structure using a stripping agent. The wastewater treatment system according to any one of (1) to (25), which is used to collect and treat cleaning water sprayed onto the surface of the structure as wastewater after use.

(31) A wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after its use,
A flocculation device that flocculates the target substance in the wastewater using a flocculant and separates the wastewater into solid and liquid,
The flocculation device is
a flocculation tank capable of accommodating the wastewater and having a drain at the bottom thereof;
A filtration bag installed in the flocculation tank, which filters the wastewater injected into the filtration bag in the process of being drained from the drain;
A spacer installed between the bottom of the filtration bag and the drain, the spacer creating a gap between the bottom of the filtration bag and the drain so that at least a liquid component of the wastewater can pass through the gap. and preventing clogging of the drain by forming the wastewater treatment system.

(32) The filtration bag is either a hard type that stands on its own in terms of shape when left alone, or a soft type that does not stand on its own in terms of shape when left alone, and its own shape is The wastewater treatment system according to item (31), which is determined depending on the shape of the flocculation tank after being installed in the flocculation tank.

(33) The filtration bag is a hard type that does not substantially deform even if an external force is applied to it in the installation state installed in the flocculation tank, or it is a hard type that does not substantially deform when an external force is applied to it in the installation state. The wastewater treatment system according to item (31) or (32), which is a soft type that substantially deforms in a flexible or elastic manner.

(34) The bottom of the flocculation tank has a configuration in which a portion where the drain is present and a peripheral portion thereof have approximately the same height in a side view;
(31) to (33), wherein the spacer is placed on an upper surface of the bottom of the flocculation tank, thereby displacing at least a portion of the bottom of the filtration bag facing the drain upwardly from the drain; A wastewater treatment system according to any of the above.

(35) In a side view, the bottom of the aggregation tank has a shape in which the part where the drain exists is lower than the peripheral part thereof, and the part where the drain exists and the peripheral part are a cylinder extending in the height direction. connected to each other by shaped connections;
any of clauses (31) to (34), wherein the spacer is retained within the cylindrical connection, thereby displacing at least a portion of the bottom of the filtration bag facing the drain upwardly from the drain; Wastewater treatment system as described.

(36) The wastewater treatment system according to item (35), wherein the spacer is configured to have a three-dimensional shape with a cavity inside using a sheet-like wire mesh or a perforated panel.

(37) The spacer has a support surface that supports the filtration bag from below at a position floating above the upper surface of the bottom of the coagulation tank over the entire length thereof, or having a support surface that supports the filtration bag from below at a position floating higher than other parts in the central part of the bag;
The wastewater treatment system according to any one of (31) to (36), wherein the spacer is placed on the upper surface of the bottom of the coagulation tank so that the support surface faces the drain with a gap in between.

(38) The spacer has a length dimension substantially equal to the length dimension of the bottom of the flocculation tank, such that the spacer is longitudinally displaced during flow of the wastewater in the flocculation tank. The wastewater treatment system according to any one of items (31) to (37), in which this is suppressed.

(39) The spacer has a length dimension shorter than the length dimension of the bottom of the flocculation tank, and the support surface is arranged so that the spacer is displaced in the length direction during the flow of the wastewater in the flocculation tank. 38. The wastewater treatment system according to item (37), wherein the support surface has a length dimension that allows the support surface to be maintained opposite the drain across a gap.

(40) The drain is arranged at a substantially central portion of the bottom of the coagulation tank in plan view,
The wastewater treatment system according to any one of items (31) to (39), wherein the spacer has a top surface in a substantially central portion of the spacer when viewed from the side.

(41) The spacer has a configuration in which the top surface and a pair of sloped surfaces sandwiching the top surface from both sides are arranged in a line in a plan view,
The top surface and the pair of slopes are continuously connected without having a substantial step in a side view,
In a side view, each slope slopes toward the bottom of the coagulation tank as it moves away from the top surface,
The wastewater treatment system according to item (40), wherein the top surface faces the drain with a gap in between.

(42) The wastewater treatment system according to any one of (31) to (41), wherein the spacer is removably installed in the coagulation tank.

(43) Furthermore,
By filtering the wastewater discharged from the flocculation tank, the target substance of the same type as the target substance in the flocculation tank is removed from the wastewater, and the target substance is removed from the treated water as wastewater after filtration. including a separation device having a separation tank for separating
The minimum captured particle diameter of the filtration bag is set larger than the minimum captured particle diameter of the separation tank, so that the primary filtration in the flocculation tank has higher filtration accuracy than the primary filtration in the separation device. The wastewater treatment system according to any one of items (31) to (42), wherein the secondary filtration is performed sequentially.

(44) The filtration bag is integrated with the spacer at the bottom of the filtration bag before installation in the flocculation tank, so that the spacer is integrated with the spacer when installed in the flocculation tank. The wastewater treatment system according to any one of items (31) to (43), wherein the wastewater treatment system moves integrally with the coagulation tank and is placed on the upper surface of the bottom of the coagulation tank.

(45) The wastewater treatment system according to any one of (31) to (44), wherein the flocculant is in powder, granular, or liquid form.

(46) Furthermore,
an addition device that adds the flocculant to the wastewater in the flocculation tank;
The wastewater treatment system according to any one of (31) to (45), further comprising: a stirring device that stirs the added flocculant in the flocculating tank.

(47) The flocculant is in the form of powder or granules,
The addition device and the stirring device are
an addition stirring unit that stores the flocculant outside the flocculation tank, disperses and adds the contained flocculant to the wastewater, and stirs the added flocculant within the flocculation tank;
A movement mechanism that allows the addition stirring unit to move two-dimensionally in a plan view relative to the flocculation tank, thereby enabling the dispersion of the flocculant to the wastewater;
The wastewater treatment system according to item (46), further comprising: a stirrer that stirs the added flocculant by rotation of a stirring blade in the flocculating tank.

(48) A wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after its use,
A flocculation device that separates the wastewater into solid and liquid by flocculating target substances in the wastewater as flocs using a flocculant,
The flocculation device is
A flocculation tank that contains the waste water when it is injected, and has a drain at the bottom thereof, and the collected waste water can be drained by gravity through the drain. With something,
A filtration bag installed in the flocculation tank, which captures solid components of the wastewater while passing through and releasing liquid components in the process in which the wastewater injected into the filtration bag is drained from the drain. filtering the wastewater by;
A spacer placed on the upper surface of the bottom of the flocculating tank, the spacer lifting up and floating at least the part of the bottom of the filter bag that faces the drain from the upper surface of the bottom of the flocculating tank, thereby A wastewater treatment system comprising: preventing the bottom of the filter bag alone or together with the flocs from clogging the drain during drainage of wastewater from the flocculation tank.

(49) The wastewater treatment system cleans the surface of the structure after the stripping agent is applied to the surface of the structure in order to strip the existing paint film from the surface of the structure using the stripping agent. The wastewater treatment system according to any one of items (31) to (48), which is used to collect and treat cleaning water sprayed onto the surface of the structure as wastewater after use.

(50) Cleaning flexible used sheets in which liquid agents and/or multiple solids of varying sizes remain as waste, thereby making it possible to recycle the used sheets. A sheet cleaning system that can be used or disposed of,
a sheet guide mechanism that takes the used sheet as a sheet to be cleaned and guides the sheet to be cleaned along a feeding path in an unfolded state;
a first removal device that separates and removes larger solids among the plurality of solids from the sheet to be cleaned by blowing air onto the surface of the sheet to be cleaned;
The surface of the sheet to be cleaned may be manually sprayed with cleaning water at high pressure by an operator to wash the sheet to be cleaned, or the surface of the sheet to be cleaned may be automatically sprayed using a power source. a second removing device that separates and removes smaller sized solids among the plurality of solids and the liquid agent from the sheet to be cleaned by spraying cleaning water at high pressure to wash the sheet to be cleaned; including,
The sheet guide mechanism includes:
a pair of guide wires installed on a stationary member and extending parallel to the feed path on each of both sides of the sheet to be cleaned in the unfolded state;
A plurality of slide rings are attached to each of both sides of the sheet to be cleaned so as to be arranged discretely along each side, and the slide rings move integrally with the sheet to be cleaned along the feeding path. things and,
including;
Each slide ring is slidably connected to a corresponding side of the pair of guide wires in the length direction thereof, so that the sheet to be cleaned is supported at both ends from the pair of guide wires. A sheet cleaning system that is suspended and slidably movable along the feeding path and integrally with the plurality of slide rings relative to the pair of guide wires.

(51) A wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after its use,
A flocculation device that flocculates target substances in the wastewater as flocs using a powdery or granular flocculant added to the wastewater to separate solid and liquid,
The flocculation device is
a coagulation tank containing the wastewater;
two first stirring shafts, each of which is arranged in parallel with a longitudinal gap extending substantially vertically in the aggregation tank in a posture extending substantially vertically;
The first stirring shafts rotate two or two groups of first stirring blades corresponding to each other in the same direction, thereby creating a downward swirl in or around a portion of the wastewater that corresponds to the gap. produced to have a depression opening to the liquid level of the wastewater,
The flocculant is dropped toward the recess of the vortex, and is then drawn in by the vortex and settled toward the bottom of the flocculation tank.

(52) The flocculation device further includes at least one second stirring shaft attached to the flocculation tank,
(51) wherein the at least one second stirring shaft rotates the respective at least one second stirring blade, thereby dispersing the flocculant drawn in by the swirl in the wastewater; Wastewater treatment system as described.

(53) The two or two groups of first stirring blades respectively corresponding to the two first stirring shafts include an upper stirring blade disposed at a position close to the liquid level of the wastewater in the coagulation tank. ,
The upper stirring blade is attached to the corresponding stirring shaft so that its axial position can be adjusted in the assembled state of the stirring shaft, so that the vertical distance from the liquid level can be adjusted (51) or ( The wastewater treatment system according to item 52).

(54) The two or two groups of first stirring blades respectively corresponding to the two first stirring shafts include lower stirring blades arranged near the bottom of the coagulation tank,
The lower stirring blade is used to supplementally accelerate the flocculant drawn in by the swirl to promote the diffusion of the flocculant, and to collect the flocculant and the sediment on the bottom of the flocculation tank. The wastewater treatment system according to any one of items (51) to (53), which is used for at least one of the following uses: promoting re-diffusion of materials containing the coagulated flocs.

(55) The aggregation device further includes:
a drain formed at the bottom of the flocculation tank;
A filtration bag installed in the flocculation tank, which filters the wastewater in the process of draining the wastewater injected into the filtration bag from the drain;
A spacer installed between the bottom of the filtration bag and the drain, the spacer creating a gap between the bottom of the filtration bag and the drain so that at least a liquid component of the wastewater can pass through the gap. The wastewater treatment system according to any one of items (51) to (54), further comprising: preventing clogging of the drain by forming the wastewater treatment system.

(56) The wastewater treatment system cleans the surface of the structure after the stripping agent is applied to the surface of the structure in order to strip the existing paint film from the surface of the structure using the stripping agent. The wastewater treatment system according to any one of items (51) to (55), which is used to collect and treat cleaning water sprayed onto the surface of the structure as wastewater after use.

(57) The wastewater treatment system according to item (56), wherein the target substance is selected from the group consisting of lead, chromium, asbestos, and PCB.

(58) A granular material stirring/mixing system that adds granular material to a liquid and stirs or mixes the granular material, the system comprising:
a tank containing the liquid;
one stirring shaft or a plurality of stirring shafts arranged close to each other in parallel, arranged in a posture extending substantially in the vertical direction in the tank;
Rotating the one or more stirring shafts and rotating stirring blades coaxially therewith, thereby creating a depression in the liquid contained in the tank that opens a downward spiral to the surface of the liquid. generate to have,
The powder or granular material is dropped toward the recess of the spiral,
A powder stirring/mixing system in which the dropped powder is drawn in by the swirl and settled toward the bottom of the tank.

(59) A method for stirring/mixing powder and granular material in which the powder and granular material are added to a liquid and stirred or mixed, the method comprising:
By rotating one stirring shaft or a plurality of stirring shafts arranged close to each other in a substantially vertical direction within the tank containing the liquid, and rotating the stirring blade coaxially with the stirring shaft, the inside of the tank is a step of generating a downward spiral in a liquid contained in the liquid so as to have a depression opening to the surface of the liquid;
a dropping step of dropping the granular material toward the depression of the generated swirl;
and a settling step of drawing the dropped powder and granular material into the swirl and settling it toward the bottom of the tank.

FIG. 1 is a perspective view, partially disassembled, of a flocculation device of a wastewater treatment system according to a first exemplary embodiment of the invention. FIG. 2 is a perspective view showing an aggregation tank, an addition stirring unit, a horizontal movement unit, and a vertical movement unit taken out of the aggregation apparatus shown in FIG. 1. FIG. 3 is an enlarged perspective view showing the addition stirring unit, the horizontal movement unit, and the vertical movement unit shown in FIG. 2 together with a hopper and a first stirrer attached to the addition stirring unit. FIG. 4(a) is a partial cross-sectional view showing the flocculation tank, addition stirring unit, horizontal movement unit, and vertical movement unit shown in FIG. 2, and FIG. FIG. 3 is a partial cross-sectional view showing the mobile unit. FIG. 5(a) is a plan view for conceptually explaining an example of the flow pattern generated in the flocculation tank by the two second agitators, and FIG. FIG. 2 is a side view for conceptually explaining an example of a flow pattern generated in the aggregation tank by the two first agitators; FIG. FIG. 7 is a side view for conceptually explaining another example of a flow pattern. FIG. 6 is a perspective view of the flocculation apparatus shown in FIG. 1, which includes a flocculation tank, a drain pipe attached to the flocculation tank, and a separation tank. FIG. 7 is a process diagram conceptually showing how the aggregation device shown in FIG. 1 is assembled, installed, and dismantled and removed. FIG. 8 is a block diagram conceptually showing a process in which wastewater as raw water is separated into solid and liquid by the action of the flocculation device shown in FIG. 1. FIG. 9 is a process diagram conceptually illustrating the assembly of the flocculation device shown in FIG. 1 and the wastewater treatment using the flocculation device in chronological order. FIG. 10 is a perspective view, partially disassembled, of a flocculation device of a wastewater treatment system according to a second exemplary embodiment of the present invention. FIG. 11 is a plan view showing the flocculation tank shown in FIG. 10 together with a floc trapping cage installed inside the flocculation tank. FIG. 12 is a process chart conceptually representing the assembly of the flocculation device shown in FIG. 10 and the wastewater treatment using the flocculation device in chronological order. FIG. 13 is a perspective view showing an example of an agglomerated floc collection sheet assembly that replaces the floc trapping cage shown in FIG. 10. FIG. 14(a) shows that in the first or second embodiment, a coagulation tank is generated by a pair of first agitators arranged in parallel or facing each other and a pair of second agitators arranged staggered. 6 is a side view for conceptually explaining an example of a flow pattern that is partially different from some examples shown in FIG. 5, and FIG. 6B is a plan view. FIGS. 15(a) to 15(c) are photographs of actual performance tests of an example (prototype) using a coagulation tank equipped with a coagulation device according to the first or second embodiment. Specifically, figure (a) shows the pair of first agitators arranged oppositely (in the figure, the term "parallel air rotary agitator" is used). ) and the hopper (represented by the term "flocculant injector" in the figure), showing a photograph taken with an operator adjusting the rotation of each agitator, In addition, the same figure (b) shows a photograph taken of a situation in which a downward spiral has occurred in the flocculation tank, and the same figure (c) shows a photograph of a situation in which a powdered flocculant is added from the above-mentioned hopper into the flocculation tank. Or show a photo of the situation in which it will be introduced. FIG. 16 is a front sectional view showing a coagulation device of a wastewater treatment system according to a third exemplary embodiment of the present invention together with a separation device. FIG. 17(a) is a perspective view showing the spacer shown in FIG. 16 together with a waste water outlet, and FIG. 17(b) is a side sectional view. FIG. 18 is a perspective view showing an example of the filtration bag shown in FIG. 16 together with a spacer and a flotation prevention device. FIG. 19 is a process diagram conceptually chronologically representing a plurality of steps performed using the wastewater treatment system shown in FIG. 16. 20(a) is a side sectional view showing another example of the spacer shown in FIG. 16, FIG. 20(b) is a side sectional view showing still another example, and FIG. 20(c) is a side sectional view showing another example of the spacer shown in FIG. It is a side sectional view showing still another example, and the same figure (d) is a side sectional view showing still another example. FIG. 21(a) is a partially sectional side view showing a sheet cleaning system according to a fourth exemplary embodiment of the present invention, and FIG. 21(b) is a partially sectional plan view. FIG. 22 is a process diagram schematically showing a sheet cleaning method carried out using the sheet cleaning system shown in FIG. 21 in chronological order along with other preceding steps and other subsequent steps. FIG. 23 is a process chart showing the sheet cleaning method shown in FIG. 22 in chronological order. FIG. 24 is a diagram showing, in a table format, the correspondence between a plurality of elements configuring the seat cleaning system shown in FIG. 21 and a plurality of processes configuring the seat cleaning method shown in FIG. 23. 25(a) is a perspective view showing the sheet guide mechanism of the sheet cleaning system shown in FIG. 21, and FIG. 25(b) is a cross-sectional view. FIG. 26(a) is a perspective view showing the paint film fragment collection sheet assembly of the first removing device in the sheet cleaning system shown in FIG. 21, and FIG. FIG. 6 is a longitudinal sectional view for explaining the opening/closing operation of the entrance opening/closing door in the piece collection sheet assembly. FIG. 27(a) is a perspective view partially showing the first injection unit of the first removing device shown in FIG. FIG. 3(c) is a side view showing the joint shown in FIGS. FIG. 28 is a perspective view showing the cleaning water collection sheet assembly of the second removal device of the sheet cleaning system shown in FIG. 21. FIG. 29 is a perspective view showing the work floor of the second removal device of the sheet cleaning system shown in FIG. 21. FIG. 30 is a front view showing the second removal device of the sheet cleaning system shown in FIG. 21 together with several coagulation filter tanks attached thereto. FIG. 31(a) is a perspective view showing the sheet guide mechanism and sheet feeding device of the sheet cleaning system according to the fifth exemplary embodiment of the present invention, and FIG. FIG. 3 is a vertical sectional view partially showing the mechanism. FIG. 32(a) is a perspective view showing the injector movement device of the second removal device of the sheet cleaning system according to the fifth embodiment, and FIG. It is a longitudinal cross-sectional view showing the main part of the device, and the same figure (c) is a perspective view showing the injector propulsion device of the injector moving device shown in the same figures (a) and (b). FIG. 33 illustrates the relationship between a plurality of steps constituting a sheet cleaning method according to a sixth exemplary embodiment of the present invention and a plurality of elements constituting a sheet cleaning system used to carry out the sheet cleaning method. FIG. FIG. 34 is a perspective view showing an example of a filter sheet as an example of a used sheet cleaned by the sheet cleaning method according to some embodiments of the present invention.

[First embodiment]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wastewater treatment system (hereinafter simply referred to as "system") 10 for wet paint film stripping according to a first exemplary embodiment of the present invention will be described in detail based on the drawings.

As shown in FIG. 1, the system 10 includes solid-liquid separation by adding a coagulant to the wastewater generated in the paint film cleaning process during the above-mentioned wet paint film stripping work to coagulate target substances in the wastewater. used to.

More precisely, this system 10 uses a stripping agent (liquid, fluid, foam, air bubble, etc.) to remove existing coatings from the surface of structures (steel towers, bridges, roads, buildings, ships, vehicles, aircraft, etc.). ), after the stripping agent has been applied to the surface of the structure for stripping, the cleaning water sprayed onto the surface of the structure to clean the surface of the structure is recovered as waste water after its use. used for processing.

To realize that application, the system 10 typically includes (a) a water collection device (not shown) for recovering the injected wash water as wastewater, as shown in FIG. 6; and (b) a flocculation device 20 having a flocculation tank that flocculates the target substance in the wastewater as flocculation flocs using a powdery or granular flocculant added to the wastewater; and (c) filtering the wastewater in the flocculation tank. Separation that separates the wastewater into solid hazardous substances (an example of "target substances") and filtered wastewater from which the hazardous substances have been removed (hereinafter also referred to as "treated water"). The separation device 30 has a tank 50.

The treated water may be reused, for example, for the same use or other industrial use, or it may be detoxified and discharged as normal sewage or industrial wastewater.

The target hazardous substances to be removed from the wastewater are selected from the group consisting of, for example, lead, chromium, asbestos and PCBs, and are selected to contain all of these components.

Of these water collection devices, flocculation device 20 and separation device 30, the flocculation device 20 and the separation device 30 located immediately downstream of the flocculation tank will be described in detail herein; , by citing Patent Document 1, duplicate explanations will be omitted and a simple conceptual explanation will be given without reference to the drawings.

<Water collection device>

As shown in Patent Document 1, the water collection device is installed on a scaffold installed in the structure (an example of an object to be cleaned) for workers, and is installed below the flooring of the structure. Contains a double seat installed in the position. The double sheet includes an upper filter sheet and a lower water collection sheet, each of which is arranged so as to overlap each other in a plan view.

The filter sheet is configured to receive the wastewater, filter the wastewater, and remove paint film particles as solids from the wastewater. The water collection sheet receives the filtered wastewater from the filter sheet, and uses its own weight to collect the filtered wastewater from the wastewater outlet (for example, when the water collection sheet is in a state of use (stretched state, unfolded state)). , a tensioned state, a tensioned state, etc.).

<Separation device 30>

In the flocculation device 20, the harmful substances in the wastewater are flocculated at the target level, and when the flocculation stage is completed, the supernatant liquid (treated water) and the precipitate (flocculated flocs of the hazardous substances) are separated between the two in the flocculation tank 40. Due to the difference in specific gravity, solid and liquid are separated into upper and lower parts.

In one example, after the aggregation stage is completed, the wastewater in the aggregation tank 40 is filtered (eg, manually by an operator) using a filter (not shown). As a result, precipitates (toxic substances or target substances) are captured in the wastewater, and as a result, only the supernatant liquid of the wastewater is discharged from the flocculation tank 40 via the wastewater outlet 44.

The discharged wastewater is put into the separation tank 50 of the separation device 30. The separation tank 50 filters the input wastewater using a sieve 52, thereby removing harmful substances in the form of solids and filtered wastewater from which the harmful substances have been removed, that is, treated water ( Treated water in the final process).

An example of the separation tank 50 is conceptually shown in a cross-sectional view at the bottom of FIG. 6 . The separation tank 50 has a sieve 52 (for example, in a stationary state or in a dynamic state such as reciprocating rotation, vibration or sound waves), and the wastewater is passed through the sieve 52 into the separation tank. Once introduced into the sieve 50, the sieve 52 traps harmful substances (eg, finely divided flocs or fine particles), while moisture passes through the sieve 52. The water that has passed through the sieve 52 is treated water.

As shown in the figure, the bottom of the sink 42 of the flocculation tank 40 (for example, if the bottom is in the shape of a mortar pointing downward, the most drooping position of the bottom). A waste water outlet 44 is formed in the bottom portion, etc.) 43, and a drain pipe (or flexible drain hose) 46 that bends two-dimensionally or three-dimensionally is connected to the waste water outlet 44. The drain pipe 46 is arranged so that its outlet faces the opening of the separation tank 50.

Since the sink 42 has a generally rectangular container shape, its outer wall is composed of a front part, a back part, and a pair of side parts. Among them, the front part and the back part face each other in the longitudinal direction of the sink 42, while the pair of side parts face each other in the width direction of the sink 42.

<Agglomeration device 20>

<Overview>

As shown in FIG. 1, in this system 10, the aggregation device 20 is generally configured to include a coagulation tank 40, an addition stirring unit 60, a horizontal movement unit 80, and a vertical movement unit 90. be done. This aggregation device 20 further includes two (more or fewer) first agitators 100 and two (more or fewer) second agitators 110. There is.

The flocculating device 20 uses the powdered flocculant as an example of the aforementioned "powder", the wastewater as an example of the aforementioned "liquid", and the flocculating tank 40 as an example of the aforementioned "container". This is also an example of the above-mentioned "powder stirring/mixing system".

<Basic specifications of stirrers 100 and 110>

The stirrers 100 and 110 have common basic specifications, and both are the above-mentioned rotary type and the above-mentioned air-driven type. Specifically, as shown in FIG. 3, each of the agitators 100, 110 has a main body 102 that houses an air motor, and from the main body 102, the air is coaxially or parallel to the output shaft of the air motor. A connected shaft 104 protrudes. The shaft 104 has, for example, a circular cross section and extends linearly, and its outer peripheral surface is a smooth surface with no irregularities. Stirring blades (eg, paddle blades, inclined paddle blades, turbine blades, inclined turbine blades, propeller blades, etc.) 106 and 116 are attached to the tip (lower end) of this shaft 104. When the stirring blades 106 are tilted paddle blades, tilted turbine blades, or propeller blades, the stirrer 100 generates a discharge flow parallel to its axial direction (for example, as shown in FIGS. 5(a) and 14(a)). See b).

Since each agitator 100, 110 is air-driven, it is explosion-proof and does not cause ignition during aggregation work, which improves worker safety.

<Technical background for developing the flocculation device 20>

By the way, in addition to the rotary type, there are also air bubble type stirrers. Prior to the present invention, the present inventor conducted a test to confirm the effectiveness of an air bubble type stirrer (for example, high stirring ability or stirring efficiency). Specifically, the inventor targeted the wastewater generated in the above-mentioned paint film cleaning process during the above-mentioned wet paint film stripping work, and jetted air bubbles into the wastewater from a nozzle to remove the wastewater. The effectiveness of the method of stirring the flocculant inside was confirmed.

However, the stripping agent used in the wet coating stripping operation contains a surfactant as a dispersant. Therefore, the same surfactant was contained in the wastewater. As a result, when the flocculant is agitated by jetting air bubbles into the wastewater, the surfactant causes a violent bubbling phenomenon in the wastewater (for example, a bubbling phenomenon so intense that the generated bubbles overflow from the flocculating tank). It was discovered that this occurs.

In order to suppress the foaming phenomenon, the present inventor proposed and implemented adding an antifoaming agent to the wastewater prior to injection of air bubbles into the wastewater. However, the inventors have found that there is room for improvement in that proposal.

Specifically, many commonly available antifoaming agents contain silicone as a component. Therefore, even if the defoaming agent is effective in defoaming the wastewater, the silicone component may not be completely removed from the final treated water and may remain.

If the silicone component remains in the final treated water and the treated water is used for wet stripping work on another structure (the target of this peeling), the silicone component will adhere to the surface of the target of this peeling. It ends up.

Therefore, the inventor of the present invention discovered that if the silicone component is attached to the surface to be removed and the surface is repainted, the paint will not adhere to the surface of the structure as planned, resulting in a new problem of poor coating. I was concerned that this might happen.

Therefore, even though an air bubble type stirrer has a higher stirring capacity than a rotary type stirrer, the inventor of the present invention has developed an air bubble type stirrer in order to give priority to avoiding the above-mentioned new problem. We decided to give up on the idea and use a rotary agitator instead.

Furthermore, the present inventor conducted research on how to effectively disperse the flocculant in order to compensate for the relative lack of stirring ability when a rotary stirrer is employed.

As a result of the research, the present inventor has discovered that the air dispersion (static air dispersion, primary air dispersion) at each instantaneous position (stationary state) of the addition stirring unit 60, and the We have achieved additional aerial dispersion (aerial dispersion, dynamic aerial dispersion, secondary aerial dispersion) through two-dimensional movement, and liquid dispersion through the appropriate deployment of multiple rotary stirrers. We obtained the knowledge that it is important to maximize the effect.

The present inventor further found that in order to maximize the stirring effect of dispersion in liquid, it is also important to optimize the flow pattern synthetically generated by a plurality of stirrers.

Therefore, the present inventor created a technical idea to embody these findings, as will be detailed later.

<Configuration and effects of flocculation tank 40>

As shown in FIG. 6, the flocculation tank 40 has a sink (tank body, housing, etc.) 42 made of stainless steel and generally shaped like a container. The shape of the sink 42 is, for example, square, forming a hexahedron with an opening at the top. The sink 42 is of a sealed type and has the function of containing liquid in an airtight manner. In this embodiment, the coagulation tank 40 and the sink 42 have separate structures, but they may have an integral structure.

The flocculation tank 40 further includes a frame 120 that supports the sink 42. The frame 120 includes a main body 122 that supports the sink 42, a plurality of legs 124 (e.g., four legs, or fewer or more legs), and a plurality of casters corresponding to the legs 124. , a grounding portion, etc.) 126, a drain pipe (drain pipe, etc.) 46, and a pair of stoppers (for example, configured as an angle member, see FIG. 2) 128, 128.

The main body portion 122 is configured using a plurality of horizontal members (a horizontal member and a vertical member) and a plurality of vertical members. Among these horizontal members, in plan view, the upper surface of one horizontal member (a pair of vertical members 48, 48) forming a pair of long sides functions as a pair of vertical rails 130, 130.

Each of the plurality of legs 124 is in contact with a support surface (ground, leveled surface, floor surface, etc.), and extends upward from there to reach the main body 122 .

Each of the plurality of casters 126 is attached to the lower end of the corresponding leg 124. By rolling these casters 126, an operator can apply a lateral force to the flocculation tank 40 and freely steer the flocculation tank 40 to move it to an arbitrary target position.

The drain pipe 46 extends two-dimensionally or three-dimensionally from the waste water outlet 44 formed in the bottom 43 of the sink 42 to the separation tank 50.

As shown in FIG. 2, the pair of stoppers 128, 128 are in contact with the addition stirring unit 60, so that the movement range when the addition stirring unit 60 moves along the pair of vertical rails 130, 130 of the coagulation tank 40 is Define.

The frame 120 is constructed by an operator assembling a plurality of members using tools. These members include a plurality of pipes (for example, square pipes), a plurality of angle members, a plurality of fittings, a plurality of fasteners, and the like.

In one example of the flocculation device 20, the flocculation tank 40 has a horizontal dimension (width dimension) of about 800 to about 1100 mm, a vertical dimension (length dimension) of about 1700 to about 2000 mm, and a height. It has a size with dimensions of about 400 to about 600 mm, which is small compared to those used for industrial wastewater.

Therefore, this flocculation device 20 can be transported to the site where wastewater is generated in its assembled state. Further, the aggregation device 20 can be transported to the site in a pre-assembly state, that is, in a state where the members are assembled, and assembled at the site.

<Addition stirring unit 60>

<Function>

As shown in FIGS. 1-4, the aggregation device 20 includes an addition stirring unit 60. This addition stirring unit 60 accommodates the coagulant outside the coagulation tank 40 before adding it to the wastewater, disperses and adds the accommodated coagulant to the wastewater, and thereby causes air dispersion of the coagulant. conduct.

Further, during the dispersion and addition of the flocculant to the wastewater, the addition stirring unit 60 can be moved two-dimensionally in plan view relative to the flocculating tank 40 thanks to the horizontal movement unit 80 and the vertical movement unit 90. The dispersion of the flocculant into the wastewater is carried out as a re-aerial dispersion of the flocculant.

Further, the addition stirring unit 60 is equipped with the two first stirrers 100 described above, thereby causing the two stirring blades 106 to rotate, thereby transferring the added flocculant into the flocculating tank 40. , thereby dispersing the flocculant in the liquid.

<Configuration>

Addition stirring unit 60 has a frame 140. A hopper 142 is attached to the frame 140 for dispersing and discharging the input flocculant and adding it to the wastewater. Furthermore, two first agitators 100 are also mounted on the frame 140. The first stirrers 100 rotate two first stirring blades 106 in order to stir the flocculant added to the wastewater in the flocculating tank 40 without using air bubbles.

However, in this embodiment, since the frame 140 is shared with the frame of the lateral movement unit 80, the hopper 142 and the two first agitators 100 appear to be in the frame of the lateral movement unit 80. It is installed.

The hopper 142 is a container that discharges the introduced flocculant downward or to the side. The hopper 142 has a sieve 143 that manually or automatically disperses the introduced flocculant.

By the way, Patent Document 6 discloses an example of a hopper having a sieve for manually dispersing an introduced flocculant. The hopper 142 in this embodiment is of the same type as that disclosed in the same document, and specifically, as illustrated in FIG. The rotation causes the flocculant in the form of powder to be dispersed in the air.

In this embodiment, an operator operates the sieve 143 manually or manually, as illustrated in FIG. Alternatively, the operator may operate the sieve 143 automatically, for example by driving a motor. The automatic control may be performed unmanned as program control, or manned as wired or wireless remote control by an operator.

As illustrated in FIG. 3, a holder 146 is attached to the frame 140. The holder 146 has a housing (made by folding a stainless steel panel, for example) that surrounds the hopper 142 from the outer periphery, with escape holes on both sides for the handle 148 of the hopper 142 to escape. Thereby, the holder 146 holds the hopper 142 in a vertically removable state by an operator.

Due to the joint action of the addition stirring unit 60, the horizontal movement unit 80, and the vertical movement unit 90, the flocculant is dispersed and added from the hopper 142 (primary aerial dispersion), and the flocculant is added by the two-dimensional movement (translational movement). Sprinkling (secondary aerial dispersion), stirring of the flocculant by the rotation of each first agitator 100 (primary in-liquid dispersion), and stirring of the flocculant by the translational movement of each first agitator 100 (Secondary in-liquid dispersion) is performed in parallel.

FIG. 3 shows this addition stirring unit 60 more specifically. This addition stirring unit 60 includes a holder 146 for holding the hopper 142 in a fixed position, a first through hole 150 formed in the frame 140 so as to match the discharge hole of the hopper 142 in the fixed position. and two second through holes 152 formed in the frame 140 for attaching the two first agitators 100.

Each stirrer 100 is mounted in its main body 102 using a corresponding second through-hole 152 .

<Configuration and effects of vertical movement unit 90>

As shown in FIGS. 1 to 4, especially FIG. 2, the vertical movement unit 90 extends horizontally across the aggregation tank 40 and straddles the sink 42, and both ends of the unit 90 extend horizontally across the aggregation tank 40. They are supported by rails 130, 130, respectively.

As shown in FIG. 3, the vertical movement unit 90 has a longitudinal frame 91, and has at least one wheel (rolling element) at each end of the frame 91, as shown in FIGS. 3 and 4(a). etc.) 92 is rotatably mounted. As shown in FIG. 4A, each wheel 92 rolls on the corresponding vertical rail 130 of the coagulation tank 40, so that the vertical movement unit 90 is vertically moved.

In this embodiment, the vertical movement unit 90 is manually moved by the user (for example, by holding the handle 86 of the horizontal movement unit 80), but it may be self-propelled using an electric motor or the like.

As shown in FIG. 4(a), the frame 91 is equipped with a pair of guides 94, 94 separated from each other in the length direction (lateral direction) thereof. The guides 94, 94 are guided by engaging the pair of vertical members 48, 48 so that the vertical movement unit 90 is vertically moved without derailing from the vertical members 48, 48. In one example, during vertical movement, the outer surface of each guide 94 slides against the inner end surface of the corresponding vertical rail (vertical member 48 made of angle material) 130 .

As shown in FIG. 3, the frame 91 has an elongated hole 96 penetrating in the thickness direction thereof, and the elongated hole 96 is inserted into the hopper 142 and each of the first agitation units when the addition agitation unit 60 moves laterally. It extends along the trajectory drawn by the aircraft 100. The elongated hole 96 allows the dispersion of the flocculant and the passage of the shaft 104 of each first agitator 100 and the first agitation blade 106 at any position during its longitudinal movement.

As shown in FIG. 3, the opposite sides of the frame 91 with the elongated hole 96 in between function as a pair of lateral rails 98, 98 for the lateral movement unit 80.

<Configuration and effects of lateral movement unit 80>

As shown in FIGS. 1 to 4, and particularly in FIG. 2, the lateral movement unit 80 is supported by a pair of lateral rails 98, 98 of the vertical movement unit 90 on both sides of the frame 140 thereof in the width direction. There is.

The lateral movement unit 80 has a longitudinal frame 140, and at least one wheel (such as a rolling element) is provided on each side of the frame 140 in the width direction, as shown in FIGS. 3 and 4(b). 84 is rotatably mounted. As shown in FIG. 4B, each wheel 84 rolls on the corresponding horizontal rail 98 of the vertical movement unit 90, so that the horizontal movement unit 80 is moved laterally.

The lateral movement unit 80 further includes a pair of handles 86, 86 at both longitudinal ends of the frame 140, which can be grasped by a user.

In this embodiment, the lateral movement unit 80 is manually moved by the user (for example, by holding a pair of handles 86, 86), but it may be self-propelled using an electric motor or the like.

As shown in FIG. 4(b), a pair of guides 88, 88 are attached to the frame 140, which are spaced apart in the width direction (vertical direction). These guides 88, 88 guide the horizontal movement unit 80 to move laterally without derailing from the elongated hole 96 by engaging with the opposing inner wall surfaces of the elongated hole 96 of the frame 91 of the vertical movement unit 90. be done. In one example, during lateral movement, the outer surface of each guide 88 slides against the opposing inner wall surface of the elongated hole 96, that is, the inner end surface of the corresponding lateral rail 98.

<Two-dimensional movement of addition stirring unit 60>

In one example, the lateral movement unit 80 is manually or automatically moved relative to the aggregation tank 40 along a spiral or zigzag path, integrally with the addition stirring unit 60 . As a result, the addition stirring unit 60 is moved two-dimensionally so that the flocculant is thoroughly spread over the entire surface of the wastewater in the flocculating tank 40.

As shown in FIG. 2 and FIG. 11 for another embodiment, the flocculating tank 40 has a movable range in which the addition stirring unit 60 can move in two dimensions (in FIG. In FIG. 11, a "vertical movement range" and a "horizontal movement range") and an immovable range in which the addition stirring unit 60 is not movable are assigned.

In this embodiment, for convenience of explanation, the horizontal movement unit 80 constitutes an example of the above-mentioned "first movement unit", and the vertical movement unit 90 constitutes an example of the above-mentioned "second movement unit". However, it is also possible to consider that the horizontal movement unit 80 and the vertical movement unit 90 cooperate with each other to constitute an example of the above-mentioned "moving mechanism."

In this embodiment, an operator moves a horizontal movement unit 80 and a vertical movement unit 90 (which are an example of the above-mentioned "moving mechanism" and hereinafter collectively referred to as a "two-dimensional movement unit") as shown in FIG. Manually or human-powered, as shown.

Alternatively, the operator may operate the two-dimensional movement unit automatically, for example by driving a motor. The automatic control may be performed unmanned as program control, or manned as wired or wireless remote control by an operator.

<Two movable first agitators 100>

As shown in FIG. 1 and FIGS. 5(b) and (c), each first agitator 100 is arranged with respect to the agglomerating tank 40 so as to perform, for example, center stirring or bottom stirring with respect to the aggregating tank 40. be done.

In one example, as shown in FIG. 5(b), both of the two first stirrers 100 rotate their respective first stirring blades 106 in the same direction.

Thereby, the two first agitators 100 cooperate with each other to create a first flow pattern, that is, a downward flow at any position of the agitator 100, and eventually the inside of the right and left sides of the coagulation tank 40. There is an upward flow on both wall surfaces, and at the positions of the two first agitators 100, the respective vertical water flows form a parallel flow pattern (parallel flow, parallel flow, symmetrical flow in one vertical cross section). generate.

However, for convenience of explanation, the illustrated flow pattern is drawn with the influence of the water flow caused by the two second agitators 110 ignored.

In another example, as shown in FIG. 5(c), two first stirrers 100 rotate their respective first stirring blades 106 in opposite directions.

As a result, the two first agitators 100 cooperate with each other to form a second flow pattern, that is, a downward flow at the position of the agitator 100 on the left side in the figure, and eventually reach the left inner wall surface of the coagulation tank 40. At the same time, the flow becomes upward at the position of the agitator 100 on the right side in the figure, and eventually becomes a downward flow along the right inner wall surface of the coagulation tank 40, and at the position of the two first agitators 100. In this case, each vertical water flow generates a flow pattern in opposite directions (opposed flow, asymmetric flow in one vertical section).

However, for convenience of explanation, the illustrated flow pattern is drawn with the influence of the water flow caused by the two second agitators 110 ignored.

Comparing these two flow patterns from the viewpoint of whether or not they increase the agitation efficiency of the flocculant, the flow pattern shown in FIG. It may be effective.

In this embodiment, in order for the addition stirring unit 100 to realize the stirring function, the stirring blades 106 rotate and translate relative to the coagulation tank 40. As a result, the first dispersion in the liquid due to the rotation of the stirring blade 106 and the shaft 104 acting as a stirring member that can perform stirring without depending on the stirring blade 106 during translational movement can stir the wastewater in the coagulation tank 40. Alternatively, a second in-liquid dispersion by stirring is performed together.

In the example shown in FIG. 1, the two first agitators 100, 100 are arranged in parallel in the horizontal direction in a plan view, but instead of this, for example, they may be arranged in parallel in the vertical direction, Further, they may be arranged in parallel in a direction that is inclined both in the horizontal direction and in the vertical direction.

<Two second agitators 110 fixedly installed>

As shown in FIG. 1 and FIG. 5(a) which is a plan view, two second agitators 110 are attached to the aggregation tank 40. As shown in FIG. 1, each agitator 110 is attached to the flocculation tank 40 by having its main body 112 removably attached to a mounting bracket 160 attached to the frame 120 of the flocculation tank 40.

These second stirrers 110 rotate two second stirring blades 116 in order to stir the flocculant added to the wastewater without using air bubbles, thereby dispersing the flocculant in the liquid. , in addition to the dispersion of the flocculant in the liquid by the two first stirrers 100.

As shown in FIGS. 1 and 5(a), the two second agitators 110 are arranged at different positions in the aggregation tank 40 in a plan view, and in the sink 42 (for example, in one pair). ) (side surfaces extending parallel to the axial direction of each stirrer 110) that are adjacent to each other.

In plan view, each second stirrer 110 realizes, for example, side stirring, as shown in FIG. 5(a).

In one example, as shown in FIG. 5(a), the two second agitators 110 cooperate with each other to create a third flow pattern, i.e., a rightward discharge at the position of the left agitator 110 in the figure. Eventually, the discharge flow collides with the right inner wall surface of the coagulation tank 40 and changes its course downward toward the agitator 110 on the right side in the figure, while the position of the agitator 110 on the right side changes. , the discharge flow becomes a leftward discharge flow, and eventually the discharge flow collides with the left inner wall surface of the coagulation tank 40 and changes its course upward toward the agitator 110 on the left side in the figure (a flow pattern (one horizontal cross section) , a unidirectional circulating flow or a swirling water flow is generated along the inner wall surface of the sink 42.

However, for convenience of explanation, the illustrated flow pattern is drawn with the influence of the water flow caused by the two first agitators 100 ignored.

Three-dimensionally, each of the second stirrers 110 is arranged so as to realize, for example, eccentric tilt stirring, as shown in FIG. Therefore, each second stirrer 110 generates a flow pattern representing a water flow that is a combination of the water flow generated by the side stirring shown in FIG. 5(a) and the water flow generated by the eccentric inclined stirring shown in FIG. It is expected that

<Synthesis flow pattern generated by first and second agitators 110>

The third flow pattern described above is simultaneously generated in the sink 42 together with the adopted one of the first and second flow patterns shown in FIGS. 5(b) and (c), respectively. These two different types of flow patterns, ie, the two types of individual flow patterns, are mixed in the sink 42 to form one composite flow pattern.

The composite flow pattern represents a more turbulent water flow than either of the two individual flow patterns. Therefore, the composite flow pattern may be more advantageous than either of the two individual flow patterns in that it contributes to increasing the agitation efficiency of the flocculant.

In one example, the first agitator 100 and the second agitator 110 generate mutually different flow patterns through the rotation (rotation) of each agitating blade 106, 116.

In another example, the first agitator 100 and the second agitator 110 generate flow patterns that are different from each other in terms of whether the flow is an axial flow or a swirling flow by rotation of each stirring blade 106, 116. .

As shown in FIG. 11 for explaining another embodiment, the two second agitators 110 are attached to an immovable range of the coagulation tank 40 in plan view. As a result, while the addition stirring unit 60 is moving, at any two-dimensional position, the two first stirrers 100 mounted on the addition stirring unit 60 are replaced by the two first stirrers 100 mounted on the addition stirring unit 60. Interference with the stirrer 110 of No. 2 is prevented.

<Definition of flocculant>

As mentioned above, the term "flocculant" herein means "flocculant" in a broad sense. Therefore, the term "flocculant" in the broad sense can be equivalently replaced with terms such as "in-liquid target substance capture agent," "hazardous substance capture agent," or "heavy metal capture agent." The "flocculant" in the broad sense selectively or inclusively includes "flocculant" in the narrow sense, "heavy metal insolubilizer" and "adsorbent such as activated carbon."

For example, a "flocculant" in the narrow sense is added to agglomerate a plurality of particles of a pre-selected harmful substance by neutralizing their charge.

In addition, the "heavy metal insolubilizer", for example, solidifies and insolubilizes heavy metals in paint film pieces in wastewater in situ, thereby suppressing the elution of heavy metals into washing water as a solvent in the wastewater, As a result, if paint film chips are captured, heavy metals are also added to ensure that they are captured without leaking.

Further, "adsorbent such as activated carbon" is added to adsorb and capture heavy metal ions in wastewater through ion exchange. It is effective to configure the activated carbon as a plurality of particles or as a filter.

Regardless of the use of any of these three types of heavy metal scavengers, heavy metals or objects containing heavy metals will be captured and form aggregates in the wastewater. Moreover, two or more of these three types of heavy metal scavengers may be used in combination in the same wastewater. Combined use is expected to improve the capture effect and broaden the types of substances to be captured.

<Test results of stirring work>

By using the system 10 shown in FIG. 1, the inventor added a flocculant to the wastewater in the flocculation tank 40 and performed stirring work.

When the agitators 100 and 110 were suddenly rotated at high speed while the wastewater was stationary, air was mixed into the wastewater unexpectedly and air bubbles were generated. In order to prevent this, the inventor of the present invention gradually accelerates the rotational speed of the stirrers 100 and 110 in synchronization with the water flow generated in the wastewater, thereby effectively preventing the generation of air bubbles in the wastewater. suppressed.

When a flocculant is sprayed from the additive stirring unit 60 in a state where a water flow (for example, turbulent flow) that is synchronized with the agitators 100 and 110 is generated in the wastewater, the flocculant is sucked into the vortex in the wastewater. I was drawn into it smoothly. As a result, the flocculant was thoroughly dispersed throughout the wastewater.

In a state where turbulent flow is occurring in the wastewater, even if the agitators 100, 110 are stopped, the turbulent flow continues due to inertia, and the agitators 100, 110 do not substantially interfere with this. Ta.

In this test, it took only about 10 minutes from the start of spraying the flocculant into the wastewater until substantially all of the target substances in the wastewater flocculated into flocs. . The reason why the flocculating work was completed in such a relatively short time is that the flocculant is thoroughly dispersed throughout the wastewater, and each part of the flocculant does not cluster unnecessarily. It is presumed that this is because it effectively came into contact with the substance and acted on it.

<Example of assembly and installation and disassembly and removal of the flocculation device 20>

FIG. 7 conceptually shows how the assembly, installation, and disassembly and removal of the aggregation device 20 are handled in a process diagram.

First, in step S11, the worker himself or a commissioned third party transports the agglomerating device 20 in an unassembled state, that is, in a state where a plurality of its parts are assembled, from the base by means of transportation such as a truck. is used to transport the product to the destination site, that is, the location where the above-mentioned wet paint film removal work is scheduled to be performed.

Next, in step S12, after arriving at the site, the worker assembles the plurality of parts to complete the flocculation device 20, and then moves and installs the flocculation device 20 to a required position. do.

Subsequently, in step S13, the worker or another person performs the above-mentioned wet paint film stripping work at the site, and in the process, the wastewater generated in the paint film cleaning process is treated using the coagulation device 20. do.

Thereafter, in step S14, after completing a series of steps, the operator disassembles the aggregation device 20 into a plurality of parts and removes them from the site.

Finally, in step S15, the worker or another person returns the collection of parts to the home base using a means of transportation such as a truck.

<An example of changes in wastewater>

FIG. 8 conceptually shows in a block diagram a process in which wastewater as raw water is separated into solid and liquid by the action of the flocculating device 20.

First, in the coagulation stage, an operator uses the coagulation device 20 to add (spray) a coagulant to wastewater as raw water.

Next, in the separation stage, an operator performs solid-liquid separation of the raw water into treated water as a liquid and flocs as solids.

This solid-liquid separation is performed, for example, in two stages.

Specifically, in the first stage, a worker separates and collects the flocs (hazardous substances) from the coagulation tank 40 (for example, the worker scoops them up with a net (for example, using a collection method). ), then the operator discharges the wastewater from the wastewater outlet 44 of the flocculation tank 40 as completely or incompletely treated water.

In the second stage, the operator feeds the discharged wastewater (with large harmful particles removed) to the separation tank 50. In the separation tank 50, remaining harmful substance particles are captured by a sieve 52. The operator may reuse the wastewater that has passed through the sieve 52 as treated water, for example, in another wet film stripping operation.

However, this solid-liquid separation may be performed in one step or through three or more steps. Moreover, the above-mentioned first stage may be omitted, and the solid-liquid separation of the waste liquid may be performed all at once by the same method as the above-mentioned second stage.

<Example of wastewater treatment work>

In FIG. 9, assembly of the flocculation device 20 and wastewater treatment using the flocculation device 20 are conceptually represented in a time-series process diagram.

First, in step S21, a worker assembles the aggregation tank 40 using the plurality of parts described above at the site or at the base.

Next, in step S22, an operator installs the vertically moving unit 90 (for example, transported in a completed state to the site or base) on the coagulation tank 40 using a pair of guides 94, 94.

Subsequently, in step S23, the worker installs the horizontal movement unit 80 (for example, transported in a completed state to the site or base) on the vertical movement unit 90 using a pair of guides 88, 88.

Thereafter, in step S24, the operator attaches the holder 146 to the frame 140 of the addition stirring unit 60, which is also the frame 140 of the lateral movement unit 80, loads the hopper 142 into the holder 146, and further attaches two A first stirrer 100 is installed. As a result, the addition stirring unit 60 is integrated with the lateral movement unit 80.

Subsequently, in step S25, the operator installs the two second agitators 110 in an inclined state on the frame 120 (the above-mentioned front and rear parts) of the aggregation tank 40 using the mounting fittings 160.

Thereafter, in step S26, the operator pours the wastewater into the sink 42 of the coagulation tank 40 as raw water. As a result, both the two first agitators 100 and the two second agitators 110 are allowed to settle in the wastewater with their respective agitating blades 106, 116 rotating.

Next, in step S27, the operator puts the flocculant into the hopper 142, and while the hopper 142 disperses and adds the flocculant to the wastewater, the two first agitators 100 rotate to remove the flocculant. Stir. Here, "dispersed addition" corresponds to primary dispersion in air, and "stirring by rotation" corresponds to primary dispersion in liquid.

Further, in step S28, the operator moves the addition stirring unit 60 two-dimensionally above the aggregation tank 40 using its handle 86. Thereby, flocculant is dispersed onto the surface of the wastewater. Here, "dispersion" corresponds to secondary aerial dispersion.

Further, in step S29, the two first stirrers 100 are rotated and moved two-dimensionally (translationally), thereby stirring the flocculant. Here, "stirring by translational motion" corresponds to secondary dispersion in liquid.

Further, in step S30, the coagulant is stirred by the rotation of the two second stirrers 110. Here, "stirring by rotation" corresponds to tertiary dispersion in liquid.

These steps S27-S30 are not performed sequentially but in parallel.

Thereafter, in step S31, an operator performs solid-liquid separation of raw water into treated water and coagulated flocs.

Subsequently, in step S32, the operator discharges the treated water from the separation tank 50 or directly from the aggregation tank 40.

In order to spray the flocculant from the hopper 142 into the flocculating tank 40, the operator moves the addition stirring unit 60 two-dimensionally with one hand, and in parallel moves the handle 148 of the hopper 142 with the other hand. Grasp the trigger 144 continuously or intermittently with the fingers of the same hand. .

If the operator operates the trigger 144 continuously, the flocculant will be sprayed continuously while the addition stirring unit 60 is moving, and if the operator operates the trigger 144 intermittently, the flocculant will be sprayed intermittently while the addition stirring unit 60 is moving. It will be scattered (while leaving a section where it will not be scattered).

As a result, the flocculant is finally sprayed as uniformly as possible over the entire surface of the wastewater in the flocculation tank 40 that is within the movable range.

[Second embodiment]

Next, a second exemplary embodiment of the present invention will be described. However, for elements common to the first embodiment, duplicate explanations will be omitted by citing the same reference numerals, and only different elements will be explained in detail.

FIG. 10 shows a partially disassembled perspective view of a flocculating device 210 of a wastewater treatment system 200 according to this embodiment.

This aggregation device 210 has common components with the aggregation device 20 in the first embodiment and new components that are not present in the aggregation device 20. The novel component is, for example, a floc capture cage 220, as shown in FIG.

The floc trapping cage 220 has a bag-like flexible net 222 mounted on a rectangular box-like frame 224, and at least the bottom part and the outer peripheral part (the above-mentioned front part, back part, and a pair of side parts) of the frame 224. It is constructed by being attached so that it is stretched over the entire area.

The net 222 is made of a flexible material and does not have the ability to self-retain its own shape, but is at least locally reinforced by a three-dimensional rigid frame 224 (made of metal, synthetic resin, wood, etc.). By doing so, its shape is substantially maintained. Therefore, the net 222 itself is an example of a soft type filtration bag, but the floc trapping cage 220 formed by the net 222 reinforced by the frame 224 is an example of a hard type filtration bag.

As shown in a plan view in FIG. 11, the net 222 is arranged in the coagulation tank 40 so as to partition the internal space into an outer space and an inner space. This net 222 is capable of trapping flocs generated in the wastewater while allowing moisture in the wastewater to leak out as treated water.

In order for the net 222 to perform a filtration action in the coagulation tank 40 in this way, the net 222 can be manufactured using, for example, a mesh sheet.

As shown in plan view in FIG. 11, the two first stirrers 100 are moved within the longitudinal and lateral movement ranges assigned to the inside of the floc capture cage 220. The two first agitators 100 are prevented from moving beyond the boundaries of the floc capture cage 220.

An operator can selectively cause the floc trapping cage 220 to sink or float relative to the coagulation tank 40. The floc trapping cage 220 may be raised or lowered manually or mechanically.

<How to raise and lower the floc trapping cage 220>

In one example, floc-trapping cages 220 are settled into the flocculation layer 40 prior to addition of flocculant to the wastewater.

When the generation of the flocs in the wastewater is completed, the floc trapping cage 220 is floated from the flocculation tank 40.

Due to the floating, the wastewater is separated into treated water leaking from the net 222 and agglomerated flocs trapped and remaining within the net 222. Thus, net 222 is used for both aggregation and separation stages. The treated water leaking from the net 222 is discharged to the drain pipe 46 via the waste water outlet 44.

In another example, before the flocculant is added to the wastewater, the floc trapping cage 220 is placed in the flocculation layer 40, and the bottom surface of the floc trapping cage 220 is attached to the upper surface (inner surface) of the bottom portion 43 of the sink 42 of the flocculating tank 40. ) to a position where it floats a predetermined distance (for example, about 3 to about 10 cm). In this state, a plate-shaped gap extending in the horizontal direction is formed between the lower surface of the floc trapping cage 220 (net 222) and the upper surface (inner surface) of the bottom portion 43 of the sink 42.

In order to form the gap, a spacer may be inserted between the lower surface of the floc trapping cage 220 (net 222) and the upper surface (inner surface) of the bottom part 43 of the sink 42, or the floc trapping cage 220 may be lifted. This may be achieved by adjusting the position.

When the generation of the flocs in the wastewater is completed, the wastewater outlet 44 is opened while the floc trapping cage 220 remains settled. Thereby, the wastewater is filtered by the net 222, and treated water of the wastewater leaks out from the net 222 while the flocs remain trapped within the net 222. The treated water passes through the gap to the waste water outlet 44, and the flow is not obstructed by the solids in the net 222, and eventually collects at the waste water outlet 44, and is then discharged into the drain pipe 46.

Due to the drainage, the wastewater is separated into treated water leaking from the net 222 and agglomerated flocs trapped and remaining within the net 222. Thus, net 222 is used for both aggregation and separation stages.

In this example, after all the treated water has been discharged from the coagulation tank 40, the floc trapping cage 220 is floated from the coagulation tank 40, whereby the coagulated flocs are collected individually (for example, in a bulk collection method). ) will be disposed of. For example, the flock catching cage 220 is constructed by winding up a wire rope (for example, see the lifting cord-like body 240 shown in FIG. 13) by a hoisting machine that is at least temporarily fixed in a space. It is a lift type that lifts up aggregated flocs using a lifter such as a hoist type lifter that raises and lowers the flocs.

As shown in a plan view in FIG. 11, the two first stirrers 100 are located inside the floc trapping cage 220 in a plan view of the coagulation tank 40 configured to include a floc trapping cage 220. be arranged to be located. On the other hand, the two second stirrers 110 are arranged so as to be located outside the floc capturing cage 220 in plan view.

However, the two second stirrers 110 may be arranged such that at least a portion thereof is located inside the floc capture cage 220 in plan view.

In FIG. 12, the assembly of the flocculation device 210 shown in FIG. 10 and the wastewater treatment using the flocculation device 210 are conceptually represented in a time-series process diagram.

First, in step S51, an operator assembles the coagulation tank 40 using the plurality of parts described above.

Next, in step S52, the operator assembles the floc trapping cage 220 and settles it into the coagulation tank 40.

Subsequently, in step S53, the operator places the vertical movement unit 90, the horizontal movement unit 80, and the addition stirring unit 60 in the aggregation tank 40 in the same manner as steps S22 to S24 shown in FIG.

Thereafter, in step S54, the operator installs the two second agitators 110 on the frame 120 of the aggregation tank 40 in an inclined state using the mounting fittings 160.

Subsequently, in step S55, the operator pours the wastewater into the sink 42 of the coagulation tank 40 as raw water. As a result, both the two first agitators 100 and the two second agitators 110 as well as the floc trapping cage 220 are settled into the wastewater. The floc trapping cage 220 is completely or partially submerged within the wastewater.

Thereafter, in step S56, in the same manner as step S27 shown in FIG. The flocculant is stirred by the rotation of the stirrer 100. Here, "dispersed addition" corresponds to primary dispersion in air, and "stirring by rotation" corresponds to primary dispersion in liquid.

Further, in step S57, the operator moves the addition stirring unit 60 two-dimensionally above the aggregation tank 40 using its handle 86, similarly to step S28 shown in FIG. Thereby, flocculant is dispersed onto the surface of the wastewater. Here, "dispersion" corresponds to secondary aerial dispersion.

Further, in step S58, the two first stirrers 100 are rotated and moved two-dimensionally (translationally) to stir the flocculant, as in step S29 shown in FIG. Here, "stirring by translational motion" corresponds to secondary dispersion in liquid.

Further, in step S59, the flocculant is stirred by the rotation of the two second stirrers 110, similar to step S30 shown in FIG. Here, "stirring by rotation" corresponds to tertiary dispersion in liquid.

These steps S56-S59 are not performed sequentially but in parallel.

Thereafter, in step S60, the operator pulls up the floc trapping cage 220 from the coagulation tank 40 and floats it from the wastewater. Thereby, the raw water is separated into solid and liquid into treated water in the coagulation tank 40 and coagulated flocs in the floc trapping cage 220.

Subsequently, in step S61, the operator directly discharges the treated water from the flocculation tank 40, or feeds the treated water discharged from the flocculation tank 40 to the separation tank 50, where the solid-liquid is again separated. Perform separation.

Additionally, in this embodiment, as illustrated in FIG. 10, the net 222 is at least locally reinforced by a rigid frame 224, so that its shape is substantially maintained.

Instead, as illustrated in FIG. 13, one or more mesh sheets 230 are three-dimensionally joined (or three-dimensionally processed) without using the frame 224, thereby achieving self-retention regarding its own shape. The present invention may be implemented in such a manner that a net that achieves this is used as the flocculation collection sheet assembly 234 that filters wastewater in the flocculation tank 40 and separates and collects flocs from the wastewater. In this embodiment, the net or floc collection sheet assembly 234 functions as a filter sheet.

Here, the phrase "to join three-dimensionally (or three-dimensionally process)" may refer to, for example, a method of sewing mesh sheets 230 as a joining method that cannot be disassembled, or a joining method that can be disassembled after use. The mesh sheets 230 may be fastened together (for example, by a clamp type in which the overlapping margin of one mesh sheet 230 or the overlapping margin between a plurality of mesh sheets 230 is tightened with screws).

In this aspect, for example, as shown in FIG. 13, the agglomerated floc collection sheet assembly 234 has a hexahedron opening at the top surface, that is, four side surfaces arranged on the front, rear, left and right sides (front and back sides, left and right sides). ) and a bottom surface.

Here, the "pentahedron" is a thin triangular pyramid formed by locally processing another sheet into a thin triangular pyramid shape at each of the four thin triangular pyramid corner parts on the bottom surface of the pentahedron. may be reinforced by overlapping them.

In this example, the aggregated floc collection sheet assembly 234 has a vertical dimension of 900 mm, a horizontal dimension of 1800 mm, and a height dimension of 500 mm in plan view.

In this example, the belt-like upper edge 236 (for example, the original The upper edge, the folded part where the original upper edge was folded back to the main body side of the mesh sheet 230 and doubled and reinforced, or the original upper edge was reinforced by overlaying another band-shaped body. A plurality of through holes 238 are formed discretely along the upper edge 236 of the object. Each through hole 238 may be reinforced, for example, by attaching a metal fitting called an eyelet.

In this example, the agglomerated floc collection sheet assembly 234 further includes one or more lifting strings (e.g., ropes, wires, chains, etc.) 240 in at least some of the plurality of through holes 238. are concatenated. Each lifting string-like body 240 is an example of a traction tool that pulls the aggregated floc collection sheet assembly 234.

The "connection" is, for example, as shown in FIG. 13, by connecting the tip of each lifting string-like body 240 to each through hole 238, the other end of each lifting string-like body 240 becomes a free end. (for example, at the upper end), or by connecting both ends of the same lifting string-like body 240 to two through holes 238, 238 facing each other, although not shown, the lifting string Both ends of the shaped body 240 serve as fixed ends (connecting ends), so that the lifting string shaped body 240 cooperates with the main body (for example, the upper edge 236) of the aggregated floc collection sheet assembly 234. It may also be realized in a loop-like manner.

In the above example, when the flocculation work using the flocculation tank 40 is completed, the portion of the lifting string-shaped body 240 exposed from the flocculation tank 40 is automatically pulled up by the operator or by using a power source. It will be done. Thereby, the coagulated floc collection sheet assembly 234 is floated from the coagulation tank 40 and drained.

At this time, the treated water (supernatant liquid) leaks out from the coagulated floc collection sheet assembly 234 and is retained in the coagulation tank 40, while the coagulated flocs are captured in the coagulated floc collection sheet assembly 234 and is stored in the coagulation tank 40. 40, whereby the treated water and the flocs are separated from each other. Therefore, in this separation step, it is possible to consider that the flocculation collection sheet assembly 234 cooperates with the flocculation tank 40 to constitute a separation tank.

<About flow analysis in the coagulation tank>

Here, a technique will be described in which the powdered flocculant is dispersed and added to wastewater in a positionally stable manner by installing two first agitators 100, 100 in parallel in the flocculating tank 40.

However, since the essence of this technology includes the parallel arrangement of two first stirring shafts 104, 104 among the two first stirring machines 100, 100, in order to adopt this technology, those two The first stirring shafts 104, 104 may be driven by a common main body 102 (drive source). This configuration can be recognized as one first agitator 100 if we focus on the total number of drive sources. Therefore, it is not essential to use two first stirrers 100, 100 to employ the above technique.

First, to explain the background behind the development of this technology, unlike liquid coagulants, when powdered coagulants are dropped into wastewater, they float to the surface and do not settle due to their porous nature. They tend not to disperse in wastewater.

Therefore, the disadvantage of powdered flocculants is that simply stirring the wastewater after dropping the flocculant does not effectively disperse the flocculant throughout the wastewater, maximizing the portion of the wastewater that comes into contact with the flocculant. Therefore, it is difficult to maximize the flocculating efficiency of the flocculant. That is, with regard to the powdered flocculant, mere stirring cannot achieve high uniform stirring performance within the flocculating tank 40.

Furthermore, even if a flocculant is dropped into wastewater, the flocculant itself immediately clusters into clumps, reducing the portion of the wastewater that comes into contact with the flocculant, which reduces the uniform dispersion effect of the flocculant. As a result, the flocculating efficiency of the flocculant decreases.

Furthermore, in recent years, the use of solvent-based strippers has been avoided due to social demands for environmental protection and improved work environment safety, and water-based strippers have been in the spotlight instead. A surfactant is added to prepare the emulsion system. Therefore, when wastewater mixed with a stripping agent is stirred using air bubbles, a large amount of air bubbles are generated in the wastewater, which makes it difficult to collect flocs as a product of the flocculant. Therefore, there is also a demand for stirring wastewater without using air bubbles.

Therefore, the present inventor arranged the two first stirring shafts 104, 104 in parallel (opposed arrangement, parallel arrangement close to each other) across a longitudinal gap extending substantially in the vertical direction, and A technique has been devised in which the stirring shafts 104, 104 are both rotated in the same direction, for example, clockwise as illustrated in FIGS. 1, 5, 10 and 14.

According to this technique, the joint action of the stirring shafts 104, 104 (for example, two solid vortices generated by the stirring shafts 104, 104 to rotate in the same direction, respectively, are brought close to each other, and the solid vortices are removed from the wastewater). By applying a rotational force to the portion sandwiched by the vortices), a downward vortex (for example, a forced vortex) is generated near the stirring shafts 104, 104. As a result, when the flocculant powder is dropped into the recess of the vortex, the flocculant powder is then drawn into the vortex, causing the flocculant powder to settle toward the bottom 43 (tank bottom) of the flocculant tank 40. It will be done.

Here, the act of ``flocculant powder being dropped into the hollow of the spiral'' means, for example, the act of ``flocculant powder being dropped into the inside of the hollow of the spiral, that is, into the cavity'', and/or `` "A flocculant powder is dropped onto the upper edge of the spiral recess or near its outer periphery."

Further, each stirrer 100, 100 is configured such that the water flow generated by the corresponding stirring blade 106 is mainly an axial flow.

When the wastewater swirls, a generally inverted cone-shaped depression is created on the free surface of the wastewater level. This ``hollow'' is also called a cavity. The vortex is created in the wastewater in such a way that a generally inverted cone-shaped depression is formed opening into the liquid level.

Further, the term "downward spiral" means a spiral in which a downward driving force is applied to the solid material when the solid material is introduced into the spiral.

By the way, an example of a powdery flocculant is one produced from naturally occurring volcanic ash and is porous. Therefore, this type of flocculant tends to float in wastewater. However, this type of flocculant is harmless, and the pH of the wastewater after it is added is approximately 8, which is within the neutral range.

Therefore, by creating the above-mentioned downward swirl in wastewater, it is easier to achieve improved agitation capacity and thus improved flocculation efficiency while enjoying the physical property advantages of such flocculants. .

FIG. 14(a) shows a pair of first agitators 100, 100 arranged in parallel or facing each other and a pair of first agitators 100 arranged in a staggered manner (in a pair of diagonal positions in the aggregation tank 40, respectively) in the first or second embodiment. 5 is an example of a flow pattern generated in the aggregation tank 40 by a pair of second agitators 110, 110 arranged in a diagonal inclined position, which is different from some of the examples shown in FIG. FIG. 4 is a side view for conceptually explaining what is different from the other, and FIG.

Regarding the flocculation device 20 configured in this way, as a result of tests by the present inventor, when the two first stirring shafts 104, 104 rotate in the same direction, as shown in FIG. It was confirmed that a downward spiral was generated in or around the vertical gap between the shafts 104, 104, that is, in the vicinity of the pair of first stirring shafts 104, 104.

FIGS. 15(a) to 15(c) show actual performance tests of an example (prototype) using a flocculating tank 40 equipped with the flocculating device 20 according to the first or second embodiment. Shows multiple photos taken.

Specifically, the figure (a) shows the pair of first agitators 100, 100 (expressed as "parallel air rotary agitators" in the figure) and the hopper 142 ( In the same figure, a photograph is shown of the flocculating device 20 equipped with a flocculating agent feeder (expressed by the term "flocculant injector") in a state in which the rotation of each of the stirrers 100, 100 is adjusted. In this photo, the parallel air rotary agitator is visible.

Here, "rotation adjustment" means that air in the atmosphere is drawn into the wastewater by the stirring blades 106 (for example, in a vortex generated near the pair of first stirring shafts 104, 104) (and Preventing or reducing the situation in which excessive foam is generated in the wastewater (or air bubbles previously mixed in the wastewater are concentrated at the center of the vortex as a result of the pressure being lower at the center of the vortex than in the surrounding area) This refers to an operator's action or act of adjusting the number of rotations (rotational speed) of the stirring shaft 104 of each stirrer 100, 100.

In addition, FIG. 4B shows a photograph of a situation in which a downward spiral has occurred in the flocculation tank 40. In this photograph, swirls generated near the pair of first stirring shafts 104, 104 can be visually recognized. Furthermore, in this photo, it can be seen that there are no bubbles in the wastewater near the swirl.

For each stirrer 100, 100, if it is an axial flow type that generates a discharge flow in the axial direction, three propeller blades, for example, are selected as the corresponding stirring blades 106.

A plurality of stirring blades 106, 106 are attached to each first stirring shaft 104, 104. In the example shown in FIG. 2A, the stirring blades 106 have different diameters along the axial direction of the stirring shaft 104.

Specifically, in the illustrated example, a large-diameter stirring blade 106 is arranged on the upper side, and a small-diameter stirring blade 106 is arranged on the lower side. In this example, the diameter of each of the plurality of stirring blades 106 becomes smaller as it approaches the free end (tip) of the stirring shaft 104.

FIG. 4C shows a photograph of a situation in which powdered flocculant is added or thrown into the flocculating tank 40 from the hopper 142. In this photo, it can also be seen that powdery material falls from the bottom of the hopper 142 aiming at the hollow of the spiral.

Said vortices are generated in the wastewater in a substantially stable manner with respect to position. That is, the swirl is within a specific region near the pair of first stirring shafts 104 (for example, a region at most about 30 cm to about 50 cm away from each stirring shaft 104 in the radial direction in plan view). There is a strong tendency for the swirl to occur only in limited locations, and therefore the swirl is always generated at approximately the same relative position with respect to the hopper 142 in plan view.

Therefore, according to this embodiment, the flocculant dropped from the hopper 142 is thrown into the cavity of the generated swirl without leaking, and is then drawn downward by the swirl to the bottom 43 of the flocculation tank 40. It is made to sink toward the earth.

In this way, according to this embodiment, the flocculant that easily floats can be sent to the bottom 43 of the flocculating tank 40 without leaking, thanks to the positionally stable generation of the swirl.

Rather, based on the fact that the spiral is stably generated within the specific region, which has been previously confirmed by the inventor, as illustrated in FIGS. 1, 5, 10, and 14, The hopper 142, which is a feeder for the flocculant powder, or the position at which the flocculant powder is dropped, is installed in the area sandwiched between the pair of first agitators 100, 100 in plan view.

Here, the flocculant powder thrown into the wastewater from the hopper 142 branches into a portion that collides with the bottom 43 of the flocculation tank 40 and a portion that does not collide.

As shown in FIG. 14(a), the part of the flocculant powder that collides with the bottom 43 of the flocculant tank 40 is dispersed in multiple directions (for example, in all directions) and diffused in the wastewater. I am made to do so.

As shown in FIG. 14, the aggregation device 20 further includes two second stirring shafts 104, 104 of two second stirrers 110 (the total number of which is one or three). or more). The second stirring shafts 104, 104 rotate at least one corresponding second stirring blade 106, 106, respectively, thereby stirring the portion of the flocculant powder that does not collide with the bottom 43 of the flocculating tank 40. , thereby dispersing that portion within the wastewater, thereby dispersing the flocculant powder throughout substantially the entire flocculation tank 40 .

Each of the second stirring shafts 104 may be removably attached to the wall of the flocculating tank 40 in an inclined position, or may be removably attached to the wall of the flocculating tank 40 (tank wall) in a substantially horizontal position. It's okay.

In the installation mode in an inclined position, the discharge flow from each stirring shaft 104 has a horizontal component (which can be converted into a circulating flow mainly in the circumferential direction within the flocculating tank 40) and a vertical component (in the flocculating tank 40). (which can be converted into a circulating flow mainly in the vertical direction). On the other hand, in the case of installation in a substantially horizontal position, the discharge flow from each stirring shaft 104 mainly contains only a horizontal component (which can be converted into a circulating flow mainly in the circumferential direction within the coagulation tank 40). .

As described above, in this embodiment, the active settling effect of the flocculant powder by the pair of first stirring shafts 104, 104 and the diffusion effect of the flocculant powder by the pair of second stirring shafts 104, 104 are achieved. Due to the synergistic effect, the diffusion of the flocculant powder in the flocculant tank 40 is maximized, and as a result, the flocculating efficiency of the flocculant is maximized.

Here, each stirrer 110, 110 is configured such that the water flow generated by the corresponding stirring blade 106 is primarily an axial flow.

By the way, according to the present inventor, as a comparative example, when a test was conducted in which only one stirring shaft 104 was used and rotated to stir wastewater, a downward spiral ( For example, a forced vortex or a solid vortex co-rotating with its stirring blade 106 was generated. When the flocculant powder was introduced into the recess of the spiral, it was confirmed that the flocculant powder was settled toward the tank bottom 43.

However, when the wastewater was circulated by the pair of second stirring shafts 104, 104 in the coagulation tank 40, the position of the swirl moved in plan view accordingly. That is, in this comparative example, the generated swirl was not stable in terms of position and was fluid.

Therefore, in this comparative example, in order to reliably feed the flocculant powder into the cavity of the spiral, the operator must use the hopper 142 (flocculant injector, flocculant powder) to follow the change in the position of the spiral. It has been found that the disadvantage of this method is that it is necessary to move the drop location (e.g., the dropping position), making the work unavoidably complicated.

Further, in this comparative example, only one first stirring shaft 104 generates a swirl around itself. In contrast, in this embodiment, two or more first stirring shafts 104, 104 create water flows in mutually opposite directions, that is, two countercurrents or A countercurrent flow occurs, resulting in the creation of a downward vortex or vortex within the vicinity region.

Therefore, when this comparative example and the present example are tested under the condition that the rotational speed of each stirring shaft 104 is the same, the rotational speed of the swirl is faster in the present example, and as a result, the flocculant is removed from the waste water. It was confirmed that the ability to transport the flocculant powder within the container, that is, the ability to draw the flocculant powder into the tank bottom 43, was high, and as a result, the dispersion ability and flocculation ability of the flocculant powder were improved.

Here, by referring to FIG. 14, the flow within the coagulation tank 40 will be analyzed more specifically.

The flow of flocculant powder (hereinafter also simply referred to as "flocculant") drawn into the tank bottom 43 by the swirl collides with the tank bottom 43, as conceptually shown in side view in FIG. There is a tendency for the flow to reverse and turn into an upwardly circulating flow with an upward component.

The flocculant transported by the upward circulation flow is then transported in the circumferential direction generated by the joint action of the pair of second agitators 110, 110, as conceptually shown in plan view in FIG. It is transported by a circulating flow and an up-and-down circulating flow (not shown). As a result, the flocculant drawn into the tank bottom 43 by the swirl is agitated so as to be dispersed over substantially the entire flocculation tank 40.

In addition, as conceptually shown in FIG. 4B, the horizontal component of the axial discharge flow from each second agitator 110 collides with the wall of the coagulation tank 40, etc. It is assumed that the flow is converted into a circumferential circulation flow (or rotational flow).

On the other hand, although not shown, the vertical component of the axial discharge flow from each second agitator 110 collides with the bottom 43 of the aggregation tank 40, resulting in a vertical circulation flow (or reciprocating flow). It is assumed that it will transform.

<Layout of stirring blades on the first stirring shaft>

In the embodiment shown in FIGS. 14 and 15, two groups of first stirring blades 106, 106 corresponding to two first stirring shafts 104, 104 are connected to one corresponding stirring shaft 106, respectively. It is configured as a plurality of stirring blades 106A, 106B, each of which is mounted at a plurality of different positions in the axial direction thereof.

That is, in this embodiment, there are a plurality of stirring blades 106A and 106B as a group of first stirring blades 106 corresponding to one first stirring shaft 104, and the other first stirring shaft There are a plurality of stirring blades 106A and 106B as a group of first stirring blades 106 corresponding to 104.

More specifically, in this embodiment, as shown in FIG. 14(a), for each stirring shaft 104, the upper stirring blade 106A closest to the liquid level of the wastewater and the lower stirring blade 106A closest to the tank bottom 43 A stirring blade 106B is attached.

The upper stirring blade 106A is attached to the stirring shaft 104 so that its axial position can be adjusted in the assembled state of the stirring shaft 104 (for example, in the completed state of the stirrer 100).

An example of the adjustment mechanism is a relative that is movable in the axial direction and includes a first member attached to one of the stirring shaft 104 and the upper stirring blade 106A, and a second member attached to the other. configured to include a moving portion (e.g., a sliding fitting portion) and a lock/unlock portion for locking or unlocking the first member and the second member at selected relative axial positions. . In the unlocked state, the first member and the second member can move relative to each other in the axial direction.

In one example, the first member is a shaft member having a circular or square cross section like a male part, and the second member is a shaft member such that the rod-shaped member is slidable in the axial direction like a female part. a hollow member to be inserted; the relative movement part is a slide fitting part; and the lock/unlock part is a fastener screwed into one of the shaft member and the hollow member. The distal end thereof engages with the other to enter the locked state, and the distal end separates from the other to enter the unlocked state.

According to this adjustment mechanism, the operator can adjust the vertical distance of the upper stirring blade 106A from the wastewater level when the stirrer 100 is assembled and completed as a product. .

For example, the operator may change the height direction position of the upper agitating blade 106A near the liquid level so that even a portion of the upper agitating blade 106A is exposed above the liquid level while the upper agitating blade 106A is rotating, and the exposed portion is exposed to the atmosphere. Adjustments should be made so that air is not entrained and mixed into wastewater, or is reduced.

In the present embodiment, two or two groups of first stirring blades 106, 106 corresponding to the two first stirring shafts 104, 104 are configured as one or multiple stages of stirring blades 106, respectively. It's okay.

Specifically, each stirring shaft 104 may have only one stage of stirring blades 106 or multiple stages of stirring blades 106 for each stirring shaft 104 . In the former case, one stage of stirring blades 106 constitutes one stirring blade per one stirring shaft 104, while in the latter case, multiple stages of stirring blades 106 constitute one stirring blade per one stirring shaft 104. It constitutes one group of stirring blades.

In this embodiment, the upper stirring blade 106 (in the example shown in FIG. 14A, for example, the uppermost stirring blade 106A) is mainly used for generating the swirl.

In this embodiment, the lower stirring blade 106 (in the example shown in FIG. 14(a), for example, the lowest stirring blade 106B) mainly collects the flocculant drawn into the tank bottom 43 by the swirl. The purpose is to accelerate the diffusion of the flocculant by accelerating the speed at which it collides with the tank bottom 43 (by accelerating the settling of the flocculant that has been drawn in), and to reduce the amount of sediment on the tank bottom 43. It is used for at least one of the following purposes: a coagulant and promoting the re-diffusion of materials containing flocs.

In another example, in order to prioritize the swirl generation efficiency, one or more stages of stirring blades 106 may be attached to one stirring shaft 104 only at positions close to the liquid surface.

<Hood as a wind shielding member that prevents the flocculant powder from being scattered by the wind>

Furthermore, in this embodiment, although not shown, the bottom surface 250 of the hopper 142, which is an example of a flocculant feeder (for example, as shown in FIG. 3, the passage surface of the sieve 143, the first through hole 150, etc.) There is a hood extending downwards from the flocculant powder drop starting area). This hood is installed so that its free end or tip faces the liquid level.

Since the flocculant in this case is a powder, it is more easily affected by wind than if it were a liquid, but if the above-mentioned hood is present, it will be a drop route for the flocculant powder and will connect the drop starting area and the liquid level. Almost the entire area located in between is not disturbed by the wind.

The hood is configured, for example, as a surrounding member, a shielding member, or a windbreak member. Moreover, this hood is configured to have a cylindrical shape, for example. Further, the hood may be made of metal, plastic, or a composite material thereof. Further, the hood may be made of a porous or transparent material so that the operator's observation of the swirl is not visually obstructed by the hood.

The effect of this hood is that when the flocculant is dropped from the hopper 142, the flocculant is shielded from the outside air along substantially the entire dropping path, thereby making the path of the flocculant less likely to be adversely affected by wind.

As a result, the flocculant powder is actually dropped as a relative position to the actual position of the dropping start area, that is, the position of the addition stirring unit 60 (which may be constant or variable during stirring). The position above the liquid level becomes stable. This makes it easy for the operator to target the swirl depressions generated on the liquid surface and inject the flocculant powder with high accuracy without straying from the target.

As a result, if the operator moves the addition stirring unit 60 two-dimensionally so that the position of the dropping start area matches the position of the depression of the swirl actually generated, then the swirl As long as the position does not change, it becomes easy to accurately drop the flocculant into the recesses of the spiral at the fixed position of the addition stirring unit 60 without being affected by wind.

<Adjustment mechanism for rotational speed of stirring shaft 104>

Furthermore, in the present embodiment, the operator can connect the main body 102 itself having a drive source (for example, an air motor) or the air hose (not shown, connected to an external high pressure source, etc.) extending from the main body 102. A worker who is in the vicinity of the stirring shaft 104 installs a regulating valve (for example, a variable throttle valve) or a regulator (for example, a controller that remotely adjusts the pressure of the high pressure source) for adjusting the rotational speed of the stirring shaft 104. It has to be able to be operated by a person.

As a result, it becomes easier for the operator to adjust the rotational speed of the stirring shaft 104 than in the case where neither the regulating valve nor the regulator is present. It becomes easy to adjust the depth.

By the way, when the above-mentioned downward spiral is used, almost all of the dropped powdered flocculant (for example, it is porous and therefore easily floats in the wastewater) is drawn into the tank bottom 43 and then removed. While there is an advantage that the flocculant (flocculant powder) can be easily dispersed almost throughout the flocculation tank 40, since the swirl is generated by the rotation of the stirring blade 106 near the liquid surface, the atmosphere There is a drawback that the air therein may be dragged into the wastewater by collision with the stirring blade 106, making it difficult to recover the flocs from the wastewater.

As a result of numerous test studies, the present inventors have determined that the height position of the upper stirring blade 106A is adjusted as described above in order to eliminate or alleviate the above-mentioned disadvantages without impairing the above-mentioned advantages. Both this and the rotational speed of the upper stirring blade 106A were adjusted as described above.

In this example, the following powder stirring/mixing method is carried out.

That is, this method includes (a) rotating one stirring shaft 104 arranged in a posture extending substantially in the vertical direction in the tank 40 containing the waste water as an example of a liquid, or placing it in parallel (parallel adjacent arrangement); By rotating the plurality of stirring shafts 104 in the same direction and rotating the stirring blades 106 coaxially with the stirring shafts 104, a downward swirl is created in the wastewater contained in the tank 40 at the liquid level of the wastewater. (b) a dropping step of dropping flocculant powder, which is an example of powder or granular material, toward the created spiral depression; , (c) a settling step in which the dropped flocculant powder is drawn in by the swirl and allowed to settle toward the tank bottom 43.

In addition, in this embodiment, the two first stirrers 100, 100 combine a swirl generation part (for example, upper stirring blade 106A) and an original stirring part (for example, lower stirring blade 106B). However, the swirl generator and the original stirring section are separated separately, and the swirl generator has a pair of rotary blades that rotate in the same direction, and at least one first stirrer 100 that generates the swirl. The present invention may be implemented in such a manner that components that mainly contribute to the above are installed in the aggregation tank 40 as individual components.

<About the stirring capacity of the stirrer>

Here, considering the stirring function of each part of the first stirrer 100, since the first stirring blades 106 are actively rotated by the motor, the first stirrer 100 may be in translational motion or stationary. It goes without saying that it has a stirring function for surrounding wastewater, regardless of its state.

On the other hand, the shaft 104 of the first stirrer 100 is actively rotated by the motor like the first stirring blade 106, but there are no substantial irregularities on the surface of the shaft 104. Therefore, when the first agitator 100 is in a stationary state, this shaft 104 does not substantially affect the surrounding water flow and does not have a stirring function for surrounding wastewater.

However, this shaft 104 stirs the surrounding water flow and influences the surrounding water flow during the translational movement of the first agitator 100, thereby having a stirring function for surrounding wastewater. Shaft 104 will effectively function as a "passive stirring member."

Therefore, the first stirrer 100 includes the stirring blades 106 as an active stirring member (a member that can perform a stirring action without depending on the translational movement of the first stirrer 100) and a passive stirring member. It also has a shaft 104 (a member that cannot perform the stirring action without depending on the translational movement of the first stirrer 100).

Therefore, in some of the embodiments described above, the first stirrer 100 is equipped with the stirring blades 106 as active stirring members in order to realize the stirring function in the addition stirring unit 60, but the present invention , for example, the first stirrer 100 is replaced by a shaft that does not rotate with respect to the first stirrer 100 (a non-rotating member, a non-rotating member, etc.) in place of the motor, the rotating shaft 104, and the rotating stirring blade 106. It may also be implemented in such a manner that it is mounted as a passive stirring member.

This is because as the addition stirring unit 60 is moved relative to the flocculating tank 40, the stirring member is moved in translation relative to the flocculating tank 40, and due to the translational movement, the stirring member is moved inside the flocculating tank 40. This is because the wastewater is stirred or agitated, thereby dispersing the flocculant in the liquid.

Here, the "passive stirring member" is defined as, for example, during the translational movement of the first stirrer 100, due to an external force (relative water flow, etc.), at least in the rotational direction, the front-back direction, or the left-right direction in a plan view. Defined as having movable parts that move passively in a continuous or reciprocating manner.

Therefore, the "passive stirring member" is specifically configured as a rod-shaped member (round, square, etc.) as a non-rotating member that extends generally downward from the main body 102 of the first stirrer 100. , it is possible to configure it as a plate-like member (blade, spiral body, etc.).

If the above-mentioned aspect is adopted, the structure of the first stirrer 100 and, by extension, the structure of the addition stirring unit 60 will be improved, compared to the case where the first stirrer 100 is equipped with the motor and stirring blades 106 to realize the stirring function. The structure is simplified and the overall weight is reduced, which allows the operator to move the addition stirring unit 60 with less force, improving workability in this respect.

Further, in some of the embodiments described above, the addition stirring unit 60 is configured to perform both dispersed addition of the flocculant and stirring of the flocculant, but instead of this, the present invention The flocculant may be added in a dispersed manner and the flocculant is not stirred, thereby reducing the weight and simplifying the structure of the addition stirring unit 60.

Furthermore, in those embodiments, in addition to the movable first agitator 100, a fixedly installed second agitator 110 is also provided in the flocculation tank 30, but instead of this, the present invention When the stirring capacity of the first stirrer 100 is sufficient, the second stirrer 110 is not installed in the flocculation tank 30, thereby realizing weight reduction and structural simplification of the flocculation device 20. Good too.

Several embodiments have been described above in which the present invention is applied to a wastewater treatment system used in a paint film cleaning process in wet paint film stripping work, but these are merely illustrative, and the present invention is applicable to other applications, such as , buildings (houses, buildings, etc.), steel towers (e.g., power transmission towers, communication towers, etc.) that are long and narrow structures constructed using steel frame structures, and civil engineering structures (such as power transmission towers, communication towers, etc.), without using a release agent. For wastewater treatment systems used for cleaning the surfaces of structures or structures such as bridges, etc.), ships, vehicles (automobiles, trains, etc.), airplanes, etc., where wastewater that may contain harmful substances is generated during work. It is possible to apply.

[Third embodiment]

Next, a third exemplary embodiment of the present invention will be described. However, for elements that are common to the first or second embodiment described above, the same reference numerals are used to omit redundant explanation, and only different elements will be explained in detail.

FIG. 16 is a front sectional view showing the coagulation device 310 of the wastewater treatment system 300 according to this embodiment together with the separation device 30.

The flocculation device 310 has a flocculation tank 40 capable of containing the wastewater, and has a wastewater outlet 44 as a drain at the bottom 43 of the flocculation tank 40 .

This flocculation device 310 further includes a flexible filtration bag 312 installed in the flocculation tank 40, in which the wastewater injected into the filtration bag 312 is drained from the wastewater outlet 44. It has something to filter.

This flocculation device 310 further includes a spacer 320 installed between the bottom 314 of the filtration bag 312 and the wastewater outlet 44, and a spacer 320 is installed between the bottom 314 of the filtration bag 312 and the wastewater outlet 44. The waste water outlet 44 is formed in a state through which at least the liquid component of the waste water can pass, thereby preventing clogging of the waste water outlet 44. In this embodiment, the spacer 320 is an example of a clogging prevention device.

FIG. 17(a) is a perspective view showing the spacer 320 together with the waste water outlet 44, and FIG. 17(b) is a side sectional view.

As shown in the figure, the spacer 320 has a support surface that supports the filtration bag 312 from below at a position floating above the upper surface of the tank bottom 43 along its entire length, or A support surface that supports the filtration bag 312 from below is provided at a central portion of the filter bag 312 at a position higher than other portions. The spacer 320 is placed on the upper surface of the tank bottom 43 so that the support surface faces the waste water outlet 44 with a gap in between.

As shown in the figure, the spacer 320 is constructed using a sheet-like wire mesh and has a three-dimensional shape with a cavity inside. It may be configured as follows. The spacer 320 forms a trapezoidal cavity between the spacer 320 and the surface of the tank bottom 43 when viewed from the side.

As shown in the figure, the tank bottom 43 has a configuration in which the portion where the waste water outlet 44 exists and the surrounding portion thereof have approximately the same height when viewed from the side. In this configuration, the spacer 320 is placed on the upper surface of the tank bottom 43, thereby displacing at least the portion of the bottom of the filtration bag 320 facing the wastewater outlet 44 upwardly from the wastewater outlet 44.

In the coagulation tank 40, the waste water and the coagulant powder flow through the spacer 320 or flow through the cavity below the spacer 320, as shown by the plurality of arrows in FIG. It is possible for the waste water to flow and reach the waste water outlet 44 .

In one example, spacer 320 has a length dimension substantially equal to the length dimension of tank bottom 43 such that spacer 320 is not longitudinally displaced during flow of the wastewater within flocculation tank 40. is suppressed.

In another example, the spacer 320 has a length dimension that is shorter than the length dimension of the tank bottom 43, and the support surface is such that the spacer 320 is displaced longitudinally during flow of the wastewater in the flocculation tank 40. The support surface has a length dimension that allows the support surface to be maintained opposite the wastewater outlet 44 across a gap.

In the example shown in FIG. 17, the waste water outlet 44 is arranged at approximately the center of the tank bottom 43 when viewed from above, and the spacer 320 has a top surface located approximately at the center of the spacer 320 when viewed from the side. has a form of

In this example, the spacer 320 has a configuration in which the top surface and a pair of slopes sandwiching the top surface from both sides are arranged in a line in plan view, and the top surface and the pair of slopes are: In side view, they are connected continuously without having any substantial step. In side view, each slope slopes toward the tank bottom 43 as it moves away from the top surface. The top surface faces the waste water outlet 44 with a gap in between.

Furthermore, the spacer 320 is removably installed in the aggregation tank 40.

FIG. 18 is a perspective view showing an example of the filtration bag 312 together with a spacer 320 and a flotation prevention device 322.

The filtration bag 312 is a soft type that does not stand on its own when left alone, and its shape is determined depending on the shape of the inner wall of the flocculation tank 40 after it is installed in the flocculation tank 40. . Alternatively, the filtration bag 312 may be configured as a hard type that stands independently in shape when left alone.

When the filtration bag 312 is the above-mentioned soft type, the upper edge of the filtration bag 312 can be removably attached and fixed to the upper edge of the coagulation tank 40 using a fitting or the like (not shown). be.

On the other hand, since there is a risk that the bottom of the filter bag 312 may unexpectedly float up from the tank bottom 43 during stirring of the wastewater, several floating preventers 322 are installed at the bottom of the tank, as shown in the figure. 43 in a removable manner. The anti-surfacing device 322 is, for example, something that presses the bottom of the filtration bag 312 against the tank bottom 43 using its own weight (e.g., a weight, a plumb bob), and may be configured as a metal angle member or other material. It is constructed as a heavy object with the shape of

FIG. 19 is a process diagram conceptually chronologically representing a plurality of processes performed using the wastewater treatment system 300 according to this embodiment.

In order to perform wastewater treatment using the wastewater treatment system 300, first, in step S301, an operator carries a flocculation tank 40 kit to the site where the above-mentioned wet stripping work will be performed, and installs the flocculation tank 40 at the site. assemble. In this embodiment, at the site where wet stripping is performed and wastewater is generated, the wastewater is treated using the coagulation tank 40. This is an example of an on-site wastewater treatment method.

Next, in step S302, the operator seats the spacer 320 on the surface of the bottom 43 of the assembled coagulation tank 40. Subsequently, in step S303, the operator installs the soft filter bag 320 inside the flocculation tank 40. Thereafter, in step S304, the operator installs several flotation prevention devices 322 on the surface of the bottom 314 of the filtration bag 312.

In another example, the filtration bag 312 is integrally coupled to the spacer 320 at the bottom 314 of the filtration bag 312 using a connector that sandwiches the pair of plates. be converted into Thereby, upon installation in the aggregation tank 40, the spacer 320 moves together with the filtration bag 312 and is placed on the upper surface of the tank bottom 43. According to this example, the worker can omit the work of placing the floating preventer 322 on the bottom 314 of the filtration bag 312, improving work efficiency.

After installing the filtration bag 320 inside the aggregation tank 40, the operator installs an addition stirring unit 60 equipped with a pair of first agitators 100, 100 and a pair of second agitators, as shown in FIG. 110, 110 is installed in the aggregation tank 40.

Subsequently, in step S305, the operator collects the wastewater (also referred to as "raw water" in the sense of the object to be filtered, separated, and detoxified) in a flocculation tank in parallel with or after the wet stripping work. Inject within 40 minutes.

Thereafter, in step S306, after the operator starts the pair of first agitators 100, 100 and the pair of second agitators 110, 110, the above-mentioned information about the pair of first agitators 100, 100 is activated. The equipment adjustment work, including the rotation adjustment of This will be done while taking into consideration that it will be generated in a consistent manner.

Subsequently, in step S307, the operator adds the flocculant powder to the wastewater by dropping it from the hopper 142. At this time, the operator drops the added flocculant powder into the downward spiral hollow formed in the wastewater.

Furthermore, by moving the addition stirring unit 60 two-dimensionally in a plane relative to the flocculating tank 40, the operator moves the dropping position of the flocculant powder over almost the entire wastewater, and transfers the flocculant powder into the plane two-dimensionally. Dimensional distribution improves stirring efficiency.

Thereafter, in step S308, the flocculant powder added into the flocculating tank 40 is stirred almost entirely within the flocculating tank 40 by the stirring action of the first and second agitators 100, 100.

Subsequently, in step S309, the wastewater is subjected to solid-liquid separation by coagulation. Thereafter, in step S310, the wastewater is drained from the wastewater outlet 44.

Subsequently, in step S<b>311 , the wastewater is primarily filtered by the filter bag 312 during the process in which the wastewater passes through the filter bag 312 . Thereafter, in step S312, the primary filtered wastewater is put into the separation device 50, and the separation device 50 performs secondary filtration on the wastewater.

In the present embodiment, the minimum captured particle diameter of the filtration bag 312 is set larger than the minimum captured particle diameter of the separation tank 50, so that the primary filtration in the coagulation tank 40 and the primary filtration in the separation device 50 are performed. Secondary filtration with higher filtration accuracy is performed in sequence.

20(a) is a side sectional view showing another example of the spacer 320 shown in FIG. 16, FIG. 20(b) is a side sectional view showing still another example, and FIG. , FIG. 3D is a side cross-sectional view showing still another example, and FIG.

In the examples shown in Figures (a) to (c), the tank bottom 43 has a configuration in which the portion where the waste water outlet 44 exists and the surrounding portion thereof have approximately the same height when viewed from the side. have

On the other hand, in the example shown in FIG. 4(d), the surface of the tank bottom 43 is a stepped surface when viewed from the side, and the tank bottom 43 has a portion where the waste water outlet 44 is present (lower portion). has a lower form than its peripheral portion (basic or high portion), and the low portion and the high portion are connected to each other by a cylindrical connection portion 326 extending in the height direction.

In this example, a spacer 320 is disposed within the tubular connection 326, thereby displacing at least the portion of the bottom 314 of the filter bag 312 that faces the waste water outlet 44 upwardly from the waste water outlet 44.

In the example shown in FIG. 4A, the spacer 320 has a chevron-shaped cross section so that a triangular cavity is formed on the surface of the tank bottom 43. In this example, spacer 320 does not have a flat top surface, but instead has a pair of sloped surfaces connected to each other.

In the example shown in FIG. 4B, the spacer 320 has a stepped shape having a high part and a pair of low parts sandwiching the high part so that a stepped cavity is formed on the surface of the tank bottom part 43. It has a cross section. In this example, the spacer 320 has a flat top surface as a high portion, and further has a pair of flat surfaces sandwiching the flat top surface as a pair of low portions.

In the example shown in FIG. 4C, the spacer 320 has a flat top surface over its entire length so that a rectangular cavity is formed on the surface of the tank bottom 43.

In the example shown in FIG. 3D, the spacer 320 has a cylindrical shape so as to be inserted into the cylindrical connecting portion 326 with a radial gap left. In this example, the upper surface of the spacer 320 is substantially the same as the surface of the peripheral portion of the cylindrical connection portion 326 of the tank bottom 43 (the basic surface of the tank bottom 43).

However, spacer 320 can be configured to have other shapes.

[Fourth embodiment]

Technical field

The embodiments described below relate to a technique for cleaning a used sheet, and in particular, to a flexible used sheet in which a liquid agent and/or a plurality of solids of non-uniform size remain as waste. technology that allows used sheets to be reused or disposed of. That is, the present embodiment embodies a technical idea regarding a method and system for cleaning used flexible sheets.

Background technology

2. Description of the Related Art A technique is already known in which a member on which unnecessary materials remain is used as a member to be processed, and the unnecessary materials are removed from the member to be processed.

Patent Document 11, listed below, describes a process in which blasting (a method of projecting particles to collide with a surface to be treated) is applied to used parts that have been painted, for the purpose of recycling them. A dry paint film stripping technique is disclosed in which paint is removed from the member as an unnecessary substance.

The document further discloses a dry cleaning technique in which, after the removal, the surface of the base material that appears due to the removal is blown with air to remove paint film fragments and the like from the surface.

On the other hand, Patent Document 12 listed below discloses a technique for removing asbestos from a building material sprayed with asbestos using a mechanical removal method for the purpose of protecting the human body from health damage caused by asbestos. There is.

The same document further describes "mechanical removal methods" such as a method for scraping asbestos from building materials using a sharp blade such as a knife or a steel brush, and a method for scraping asbestos from construction materials using a rotating brush. A method of scraping is disclosed.

The document further discloses a technique for sealing a removal work area with a plastic sheet and installing a suction blower having a filter inside the work area to suck out asbestos.

By the way, in certain cases, for example, it has been confirmed that hazardous substances such as lead are present in the existing paint film attached to the base of a structure, and the Ministry of Health, Labor and Welfare has issued a notice dated May 30, 2014. When it is necessary to comply with the notification, buildings (houses, buildings, etc.), steel towers that are elongated structures constructed using steel frame structures (e.g. power transmission towers, communication towers, etc.), civil engineering works etc. In order to repaint the surface of structures such as structures (bridges, etc.), ships, vehicles (automobiles, trains, etc.), airplanes, etc., the existing coating film that has already been applied to the surface of the structure ( A type of construction is performed in which the paint is stripped from the substrate (the substrate) and a new paint is then applied on the same surface of the structure.

Against this background, the present inventor developed a coating film peeling method prior to completing the present embodiment (see FIG. 22).

The developed coating film removal method consists of a wet stripping process in which a liquid stripping agent is made into air bubbles and applied to the surface of the structure, thereby peeling off the existing coating film from the surface of the structure, and after the application, the existing coating film is removed from the surface of the structure. and a wet cleaning step of spraying cleaning water onto the surface of the structure in order to clean the surface of the structure. This coating film removal method is disclosed in Patent Document 13 listed below.

By the way, when implementing this coating film peeling method, a wastewater treatment step is required in which the cleaning water sprayed onto the surface of the structure is recovered and treated as wastewater after its use.

Regarding this wastewater recovery process, for example, from the viewpoint of effective resource utilization, the present inventors have realized that there is a demand for partially or completely detoxifying the wastewater and reusing it as new cleaning water. I noticed.

Based on such knowledge, prior to the present invention, the present inventor developed a wastewater treatment process in which cleaning water sprayed onto the surface of a structure after application of a release agent is recovered and treated as wastewater, and patented the process. No. 6853599 was obtained. This patent publication is cited herein as the aforementioned Patent Document 13.

Specifically, in the wastewater treatment step, a water collection step of collecting the wastewater, a coagulation step using a coagulation tank, and a separation step using a separation tank are performed in order.

Here, the "water collection step" includes a step of filtering the wastewater using a filter sheet that is a flexible mesh sheet, which will be described in detail later.

Further, in the "flocculation step", for example, after the filtration, the wastewater is put into a flocculation tank, a powdery or granular flocculant is added to the wastewater, and thereby the target substance in the wastewater is converted into flocculation flocs. This is a coagulation process.

Further, in the "separation step", for example, after the coagulation step is completed, the waste liquid is introduced from the coagulation tank into a separation tank, and the waste liquid is passed through a filtration section in the separation tank, whereby the waste liquid is This is a process in which solid-liquid separation is performed into treated water and flocs.

Prior art documents Patent Document 11: Japanese Patent Application Publication No. 2003-200349 Patent Document 12: Japanese Patent Application Publication No. 3-221669 Patent Document 13: Japanese Patent No. 6853599

problem to solve

The inventor subsequently conducted various tests and conducted various research and developments in order to improve the practicality of the developed wastewater treatment technology.

As a result, the inventors of the present invention have also noticed that there are additional demands regarding this wastewater recovery treatment, for example, from the viewpoint of effective use of resources.

That is, the present inventor cleans the parts used to carry out this wastewater treatment process and the parts used in the processes carried out prior to it, such as the above-mentioned wet stripping process and wet cleaning process. They realized that there were also requests for reuse.

Furthermore, the present inventor has proposed that "components used to carry out this wastewater treatment process" include, for example, a member for filtering used wash water when collecting used wash water in the water collection process described above. We have found that it is effective to select a filter sheet or a filter sheet used in the aggregation tank or separation tank mentioned above.

Because the filtration sheet is a mesh sheet, the filtration sheet usually contains part of the above-mentioned stripping agent (an example of a liquid agent) and fragments of the existing paint film (solids) as unnecessary materials. (example) remains.

Specifically, the stripping agent as an unnecessary substance remaining on the filter sheet is, for example, a stripping agent applied to the surface of the structure in a wet stripping process that precedes the wastewater treatment process, and then the wastewater is removed. This is an example of a substance that is dissolved in washing water and turned into droplets in the wet washing process that precedes the treatment process.

Moreover, the coating film pieces as another unnecessary matter remaining on the filter sheet are, for example, an example of solid matter incidentally generated in the wet cleaning process that precedes the wastewater treatment process.

Furthermore, the present inventor found that it is effective to select, as "members used in the wet peeling process," auxiliary members to support the wet peeling process, rather than the direct target of the process. I also noticed that.

In the wet stripping process, as such an auxiliary member, a release agent scattering prevention sheet is used to prevent droplets from scattering when the liquid called release agent hits the surface of the structure and the droplets are generated. There is. There is a possibility that droplets of the release agent will be scattered on the release agent scattering prevention sheet, and the liquid component of the release agent (including paint film chips in some cases) may adhere as an unnecessary residue.

Furthermore, the present inventor found that it is effective to select auxiliary members to support wet peeling as "members used in the wet cleaning process" rather than the direct target of the process. I also noticed that.

In the wet cleaning process, as such an auxiliary member, when the liquid called cleaning water hits the surface of the structure, its splashes (splashes of the cleaning water used in the wet cleaning process, and those that precede the wet cleaning process) are used. Prevents droplets and paint film fragments from scattering when they are generated together with paint film fragments attached to the surface of the structure (e.g., droplets of the remover applied to the surface of the structure during the wet peeling process) There is a sheet to prevent paint film fragments from scattering. The droplets and the paint film fragments may adhere to the paint film fragment scattering prevention sheet as unnecessary residue.

Here, the present inventor has proposed that the "filter sheet," the "removal agent scattering prevention sheet," and the "paint film fragment scattering prevention sheet" all have flexibility in order to meet the requirement of high storage performance. It was proposed to configure the device as a member, that is, a member that does not have self-retention properties regarding its shape and is deformed by external force.

This type of flexible sheet can be easily folded, folded, or rolled into a compact storage form, and can also be unfolded into a three-dimensional shape or flattened into a flat shape. It has the characteristic that it is easy to unfold and realize the state of use.

Here, a "flexible sheet" may be constructed using a soft material or a hard material, but it may be divided into multiple blocks and the blocks may be foldable or bendable. In some cases, they are configured to be joined, and in other cases.

However, the materials for the above-mentioned "filter sheet," "release agent scattering prevention sheet," and "paint film fragment scattering prevention sheet" are not necessarily of the same type due to their different uses.

In response to such a proposal by the present inventor, Patent Documents 11 to 13 disclose a method in which a flexible sheet having material properties that does not have self-retention properties is selected as the object to be cleaned, and the sheet is cleaned and reused. It is not disclosed that

Furthermore, in each of Patent Documents 11 to 13, there is disclosed that a used sheet that has been used during a different process prior to the sheet cleaning process has a liquid agent and/or a plurality of solid particles that are not uniform in size. There is also no disclosure of selecting items that remain as unnecessary items as objects to be cleaned, cleaning them, and reusing them.

Here, a "liquid agent" is defined as a substance that is used on the object to be cleaned, for example, in a corresponding process to achieve the purpose or to facilitate the achievement of the purpose. Moreover, a "solid substance" is defined as, for example, a substance to be separated from an object to be cleaned.

Further, none of Patent Documents 11 to 13 discloses wet cleaning and reuse of used sheets.

In addition to the above-mentioned requests, there are also requests to remove harmful substances from used sheets and legally dispose of the used sheets.

By the way, the term "sheet" is used throughout this application to mean, for example, a thin strip-shaped member, a thin rectangular member, a thin flat member, etc.

Further, to explain the manufacturing method, this type of sheet is manufactured, for example, by weaving a plurality of threads made of synthetic resin.

Therefore, for the sheet manufactured in this way, whether or not the sheet has air permeability and its degree are determined depending on, for example, the size of the gaps between the plurality of threads in the woven state and the characteristics of the surface coating.

There are two types of sheets, such as blue sheets and flame-retardant sheets, which have almost no air permeability, are highly waterproof and airtight, and others are mesh-like and highly breathable. It is classified into a highly breathable type (for example, type 1 mesh sheet, etc.).

According to the classification, among the aforementioned "filtration sheet," "removal agent scattering prevention sheet," and "paint film fragment scattering prevention sheet," which all belong to the sheet category, "release agent scattering prevention sheet" and "paint film fragment scattering prevention sheet" Since the priority purpose of the "preventive sheet" is to prevent scattering, the former low-air permeability type is basically used, for example. On the other hand, since the purpose of a "filter sheet" is filtration, the latter highly breathable type or mesh type are used.

With these circumstances as a background, the present embodiment (technical idea) is a flexible used sheet in which a liquid agent and/or a plurality of solid objects of varying sizes remain as unnecessary materials. The purpose of this project was to provide a technology that would enable the cleaning of used sheets and the reuse or disposal of the used sheets.

Problem solving means

Hereinafter, the sheet cleaning system (hereinafter simply referred to as "system") 10 according to the present embodiment will be described in detail with reference to FIGS. 21 to 34, along with a sheet cleaning method performed using the system.

FIG. 21(a) is a partially sectional side view showing the system 10, and FIG. 21(b) is a partially sectional plan view.

The system 10 cleans sheets with residual debris that were used during another process (e.g., the wet stripping process, wet cleaning process, and wastewater treatment process described above) that precedes the sheet cleaning method. , thereby allowing the used sheet to be reused or disposed of.

FIG. 22 shows how the above-described sheet cleaning method carried out using the system 10 can be carried out using the above-mentioned other preceding steps and other subsequent steps (e.g., reusing used sheets for other steps after cleaning). FIG.

In this embodiment, as the "used sheet", for example, as shown in FIG. It is possible to select the aforementioned coating film fragment scattering prevention sheet used during execution of the wet cleaning process, or to select the filtration sheet used during execution of the preceding wastewater treatment process.

<Wastewater treatment unit>

An example of a filter sheet used during the wastewater treatment process is disclosed in Patent Document 13.

FIG. 34 of the present application shows an example of a filtration sheet as an example of a used sheet cleaned by a sheet cleaning method according to some embodiments of the present invention. An example of a double sheet 202 as part of a wastewater treatment unit 200 is shown in perspective view along with scaffolding 210.

As is well known, the scaffold 210 includes a plurality of pillars 212 extending vertically from the ground as an example of a support surface (foundation surface), and is suspended (supported) in a horizontally extending position by the pillars 212. ), which supports the feet of the worker from below and allows the worker to perform high-pressure cleaning work (the wet cleaning process) using a cleaning gun 216 that sprays cleaning water at high pressure. It is configured to have a plurality of members including a handrail and a plurality of handrails (not shown).

The flooring material 214 is configured, for example, by a member having a plurality of openings (through which cleaning water passes) in a plan view.

The scaffolding 210 is provided as a scaffolding for a worker who cleans and strips a structure 218, which is an example of an object to be cleaned, and therefore, the scaffolding 210 is usually installed on the ground adjacent to the structure 218.

The double sheet 202 is installed on a scaffold 210 installed in a structure 218 for workers at a position below the flooring 212 thereof. The double sheet 202 is composed of an upper filter sheet 220 and a lower water collection sheet 222, which are arranged so as to overlap each other in a plan view.

<Filtration sheet>

The filter sheet 220 receives the cleaning water jetted from the cleaning gun 216 (mainly used cleaning water that collided with the surface of the structure 218 and bounced there) as wastewater, filters the wastewater, and removes it from the wastewater. It is configured to capture and recover paint film chips and the like as solid objects.

The filtration sheet 220 is a flexible mesh sheet, and is suspended by a plurality of handrails selected from among the plurality of handrails in a horizontally stretched state. The filter sheet 220 captures some of the paint film fragments from the received wastewater through the mesh of the mesh sheet.

To explain specifically about its filtration action, wastewater introduced into the filtration sheet 220 is size-sorted into those that are captured and those that pass through without being captured, depending on the size and shape of the mesh of the filtration sheet 220. Or sorted by shape.

The filtration sheet 220 captures a plurality of paint film pieces (such as peeled off debris) and debris that are larger than the mesh, which are initially mixed into the wastewater, and thereby separates them from particles that are smaller than the mesh. and collect it. The main purpose of this recovery is, for example, to prevent clogging of the drain pipe 138 (see FIG. 30) or other pipes connected to it due to the wastewater flowing together with large solids into the drain pipe 138 (see FIG. 30). The purpose is to prevent it.

This filter sheet 220 allows cleaning water (fresh water) of the wastewater to pass through, as well as pieces smaller in size than the mesh among a plurality of paint film pieces (such as peeled off debris) and debris that are initially mixed into the wastewater. and drain it.

<Water collection sheet>

The water collection sheet 222 is configured to receive the wastewater filtered by the filter sheet 220 from the filter sheet 220 and guide the filtered wastewater to the wastewater outlet 224 using its own weight. This water collection sheet 222 is mainly composed of a flexible sheet without mesh, and is suspended in a horizontally stretched and expanded state by a plurality of handrails selected from the plurality of handrails. Ru.

The water collection sheet 222 has a bottom portion 222b lower than the peripheral portion 222a at the center thereof, and has a generally mortar-like shape as a whole. When this water collection sheet 222 receives wastewater from the filter sheet 220 at the peripheral portion 222a, the wastewater descends along the peripheral portion 222a due to its own weight, and eventually joins at the bottom portion 222b. At its bottom 222b, a waste water outlet 224 is installed for sending waste water downstream.

The waste water outlet 224 is connected to a coagulation tank and a separation tank via a connecting pipe 230 and a drain pipe (not shown). The aggregation step is performed using the aggregation tank, and the separation step is performed using the separation tank.

As mentioned above, there are several candidates for the "used sheet" on which the sheet cleaning method according to the present embodiment is performed, but in this embodiment, the filter sheet 220 is selected as the "used sheet". ing.

As mentioned above, the filter sheet 220 is used to filter the used wash water used in the wet washing process. The used cleaning water contains the stripping agent applied to the surface of the structure in the wet stripping process, and a plurality of paint film pieces that appeared on the surface of the structure in the wet cleaning process (the existing paint film mentioned above). There is a possibility that fragments (such as those that have been crushed or otherwise fragmented) may be mixed into the used washing water.

In the field of paint film removal, multiple paint film pieces that appear on the surface of a structure are generally not uniform in size, and may be large in size (for example, on the order of cm) or small in size (for example, on the order of cm). mm order and smaller than 1 mm) are mixed.

Therefore, when the filtration sheet 220 is selected as the "used sheet", the stripping agent (an example of "liquid") and the plurality of coating film pieces (" There is a possibility that "multiple solids of uneven size" (for example, "multiple solids of uneven size") remain.

On the other hand, the filter sheet 220 is configured as a mesh sheet, as described above. Therefore, the filter sheet has high air permeability because it is constructed by weaving a plurality of threads with larger gaps than the low air permeability sheet.

Therefore, in the used filter sheet 220, some of the solids may adhere to or become entangled with the fibers of the filter sheet 220, and some of the solids may remain as unnecessary materials.

Therefore, in the present embodiment, the above-mentioned sheet cleaning method removes the residue from the used filtration sheet 220 as completely as possible, that is, the filtration sheet can be reused or legally The objective is to separate and remove the waste so that it can be disposed of.

Further, the filter sheet 220 is constructed by weaving a plurality of threads made of a soft material, and has a thin plate shape as a whole. Therefore, this filter sheet 220 does not have self-retention properties regarding its overall shape, and therefore has flexibility. As a result, while this filter sheet 220 can easily transition between, for example, the unfolded state and the deformed state, it is necessary to apply an external force to this filter sheet 220 in order to maintain it in the unfolded state. .

Furthermore, this filter sheet 220 has a length dimension and a width dimension and has a generally rectangular shape in a planar unfolded state.

Based on the circumstances described above, the system 10 was developed for the purpose of cleaning the filter sheet 220 as the sheet to be cleaned SC.

Generally speaking, as shown in FIG. 21, this system 10 includes a scaffold 20 that is temporarily constructed as a support frame by, for example, an operator assembling structural materials such as a plurality of steel pipes on site. This system 10 is assembled by an operator attaching, for example, a plurality of components required for sheet cleaning to the scaffold 20 in a removable manner. As shown in FIG. 21, a plurality of necessary scaffold boards 22 are attached to the scaffold 20.

<Overall schematic configuration of system 10>

As shown in FIG. 21, a plurality of components required for sheet cleaning according to the present embodiment are installed on the scaffold 20, including a sheet guide mechanism 30, a first removal device 32, a second removal device 34, and a sheet recovery device. There are 36 etc. The floor surface (including the ground) on which the scaffolding 20 comes into contact is protected by a non-ventilated sheet (floor curing sheet) so as not to be contaminated by substances generated by the implementation of the current sheet cleaning method. Each of these components will be explained below.

<Sheet guide mechanism 30>

The sheet guide mechanism 30 uses the scaffolding 20 to guide the sheet to be cleaned SC in the unfolded state along a feeding path FP (e.g., equal to the trajectory drawn by the sheet to be cleaned SC when the sheet to be cleaned SC is sent). will be installed on the

<First removal device 32>

The first removing device 32 uses the first injection unit 40 to blow air onto the surface of the sheet to be cleaned SC in a first working space WS1 that is at least partially surrounded at a first position P1 on the feed path FP.

Thereby, this first removing device 32 blows off the larger pieces of the plurality of coating film pieces from the sheet to be cleaned SC and suspends them in the air, thereby removing the plurality of coating film pieces from the sheet to be cleaned SC. Remove the larger pieces.

<Second removal device 34>

The second removal device 34 is operated manually by an operator using a high-pressure cleaning gun 42 in a second work space WS2 that is at least partially surrounded at a second position P2 downstream of the first position P1 in the feed path FP. To make it possible to wash a to-be-cleaned sheet SC by spraying cleaning water at high pressure onto the surface of the to-be-cleaned sheet SC.

Thereby, this second removing device 34 washes and separates the small-sized ones among the plurality of coating film pieces and the above-mentioned stripping agent from the sheet to be cleaned SC with the cleaning water that has come into contact with them, and separates the pieces from the separated sheet SC. is carried by the cleaning water and dropped, thereby being removed from the sheet to be cleaned SC.

The second removing device 34 further includes, after the sheet to be cleaned SC has been washed with water, a second jetting unit 46 blowing air onto the surface of the sheet to be cleaned SC in the same second working space WS2. The sheet to be cleaned SC is drained.

<Sheet collection device 36>

The sheet collecting device 36 is configured to collect the cleaned sheet SC as a sheet roll 50 by winding up the cleaned portion of the cleaned sheet SC on the most downstream side of the feed path FP.

In this embodiment, when the handle 52 is rotated by the operator, the core 54 is manually rotated, and the cleaned portion of the sheet SC to be cleaned is wound around it.

Instead, this sheet collection device 36 uses a power source (for example, an electric motor) and, for example, by remote control by an operator, continuously or intermittently collects the sheets SC to be cleaned at an appropriate timing. Alternatively, the cleaning sheet SC may be automatically wound up.

<Sheet cleaning method>

FIG. 23 is a process diagram chronologically illustrating an exemplary sheet cleaning method according to the present embodiment performed using the system 10. Further, FIG. 24 is a diagram showing in a table format the correspondence between a plurality of elements constituting the system 10 and a plurality of processes constituting this sheet cleaning method.

S1: Seat installation process

As shown in FIG. 23, this sheet cleaning method includes a sheet attaching step as step S1. This sheet attachment step S1 is a step in which an operator attaches the sheet to be cleaned SC to the sheet guide mechanism 30 in a horizontally unfolded state.

As shown in FIG. 24, this sheet mounting step S1 is performed using the sheet guide mechanism 30, but instead, the sheet guide mechanism 130 in the fifth embodiment, which will be described in detail later with reference to FIG. 31, is used. May be used.

As mentioned above, the sheet to be cleaned this time is the filter sheet 220, so basically, unnecessary substances mainly remain on one of both surfaces (action surface) of the sheet to be cleaned. become.

Based on this, the sheet to be cleaned SC is attached to the sheet guide mechanism 30 with the working surface of the sheet to be cleaned SC facing downward, so that in the first removal process described below, the air blow is applied to the sheet to be cleaned SC. The air blow is then blown onto the surface opposite to the action surface, and then the air blow passes through multiple openings (spaces between knitted yarns, gaps within the fibers, etc.) of the sheet to be cleaned SC and is blown away from the action surface. It is discharged.

As a result, in the first removal step S3, almost all of the unnecessary matter adhering to the sheet to be cleaned SC falls downward due to both the wind pressure from the air blow and the gravity, and is separated from the sheet to be cleaned. be done.

In the present embodiment, the sheet to be cleaned SC is continuously or intermittently fed in the unfolded state within the system 10, but throughout this application, the term "in the unfolded state" means that the sheet to be cleaned SC is constantly or It does not necessarily mean that it is in a deployed state along its entire length. The term "deployed state" refers to the part (area) in which the sheet to be cleaned SC passes through the cleaning processing section of the system 10, or more precisely, at least the first removal device 32 and the second removal device 34, which will be described in detail later. It is sufficient that the cleaning sheet is in the expanded state at , and this means that the portion (region) in the expanded state may transition from the downstream side to the upstream side over time over the entire length of the sheet to be cleaned SC.

In order to support this, as shown in FIG. 21, there is a pre-cleaning section waiting before cleaning on the upstream side of the sheet SC to be cleaned, that is, a section to be cleaned in the upstream space of the sheet guide mechanism 30. There is a part where the sheet SC is folded and kept on standby, and there is also a collected part where the sheet SC to be cleaned is wound up and collected after cleaning, on the downstream side of the same sheet SC to be cleaned. .

S2: Sheet feeding process

As shown in FIG. 23, this sheet cleaning method further includes a sheet feeding process as a subsequent step S2. This sheet feeding step S2 is a step of feeding the sheet to be cleaned SC in a developed state along the feeding path FP continuously or intermittently, or in one direction or in both forward and reverse directions.

In this embodiment, the sheet to be cleaned SC is manually fed by the operator, but instead, as in the fifth embodiment, which will be detailed later with reference to FIG. It may also be sent automatically using .

S3: First removal step

As shown in FIG. 23, this sheet cleaning method further includes a first removal step as a subsequent step S3. This first removal step S3 is a step of separating and removing larger pieces among the plurality of coating film pieces by blowing air onto the surface of the sheet to be cleaned SC in the first working space WS1. .

As shown in FIG. 24, this first removal step S3 is performed using the first injection unit 40 (described in detail later) of the first removal device 32. Further, the object to be removed from the sheet to be cleaned SC in this first removal step S3 is a large piece of paint film or the like.

S4: Second removal step

As shown in FIG. 23, this sheet cleaning method further includes a second removal step as a subsequent step S4. This second removal step S4 is performed in the second working space WS2 by spraying cleaning water at high pressure onto the surface of the sheet to be cleaned SC and washing the sheet to be cleaned with water, thereby removing the plurality of sheets from the sheet to be cleaned SC. This is a step of separating and removing small-sized paint film pieces and the stripping agent.

As shown in FIG. 24, this second removal step S4 is performed using a high pressure cleaning gun 42 (described in detail later) of the second removal device 34. Further, the objects removed from the sheet to be cleaned SC in this second removal step S4 include small-sized paint film pieces, stripping agents, and the like.

S5: Third removal step

As shown in FIG. 23, this sheet cleaning method further includes a third removal step as a subsequent step S5. This third removal step S5 is a step in which the surface of the sheet to be cleaned SC is drained (eg, forced drying) by blowing air onto the surface of the sheet to be cleaned SC in the second work space WS2.

As shown in FIG. 24, this third removal step S5 is performed using the second injection unit 46 (described in detail later) of the second removal device 34. Further, the object to be removed from the sheet to be cleaned SC in this third removal step S5 is water or the like.

In this embodiment, this third removal step S5 is performed in the same second work space WS2 together with the second removal step S4, but instead, from the second position P2 on the feed path FP. In the third work space WS3 located at the third position P3 on the downstream side, air may be blown onto the surface of the sheet to be cleaned SC to drain the sheet to be cleaned.

S6: Sheet collection process

As shown in FIG. 23, this sheet cleaning method further includes a sheet recovery process as a subsequent step S6. This sheet recovery step S6 is a step of winding up the cleaned portion of the sheet SC to be cleaned and recovering it as a sheet roll 50 at a fourth position P4 downstream from the third position P3 on the feed path FP.

As shown in FIG. 24, this sheet collection step S6 is executed using a sheet collection device 36 (described in detail later).

<Specific configuration of each component of system 10>

<Sheet guide mechanism 30>

As illustrated in FIGS. 25(a) and 25(b), in one example, the sheet guide mechanism 30 includes a plurality of slide rings 60 (for example, (b) a pair of carabiners installed on the scaffold 20 as a stationary member and extending parallel to the feed path FP; Guide wires 62, 62 (an example of a "pair of guide rails").

As illustrated in FIG. 21, the pair of guide wires 62, 62 are fixedly installed on the scaffold 20. As illustrated in FIGS. 25(a) and 25(b), each slide ring 60 is slidably connected to the corresponding one of the pair of guide wires 62, 62 in the length direction thereof.

As illustrated in FIGS. 25(a) and 25(b), in one example, the sheet to be cleaned SC has a plurality of eyelets 66 arranged discretely along both sides thereof. As is well known, the eyelet 66 is a metal fitting attached to the sheet to be cleaned SC for each through hole 162 (see FIG. 31(b)) to reinforce the through hole 162 of the sheet to be cleaned SC. (through-hole reinforcement).

As illustrated in FIGS. 25(a) and 25(b), the corresponding slide ring 60 connects each eyelet 66 (through hole 162) and the guide wire 62 so as to bundle the guide wire 62 on the corresponding side. 62 and is loosely attached and connected. Thereby, the sheet to be cleaned SC can be slid in the feeding direction integrally with the slide ring 60 relative to the guide wire 62, which serves as a substantially stationary member.

The sheet to be cleaned SC is connected to a pair of guide wires 62, 62 at both ends thereof in the width direction, and is thereby suspended from the pair of guide wires 62, 62 with both ends supported. At this time, as illustrated in FIG. suspended in contact with (slidably in contact with) a sheet support surface that is substantially continuous along the feed path FP; It is suspended floating from the ground.

As illustrated in FIGS. 25(a) and 25(b), in this embodiment, a plurality of eyelets 66 are attached along the width direction to the tip of the both ends in the length direction of the sheet to be cleaned SC. has been done. A pull-out rope 70 is detachably attached to at least one of the eyelets 66 as an example of a pulling tool for manually pulling the sheet to be cleaned SC in the feeding direction.

In this example, for example, in the first step before the leading end of the sheet SC to be cleaned reaches the sheet collecting device 36, the operator uses the pull-out rope 70 to pull the sheet SC to be cleaned in the longitudinal direction. In the second stage after the leading end of the sheet SC to be cleaned reaches the sheet collecting device 36, the sheet SC to be cleaned is manually or automatically wound up using the sheet collecting device 36. It is possible to send.

<First removal device 32>

<First mesh plate 72>

As shown in FIG. 21, the first removing device 32 has a first mesh plate 72 that faces the lower surface (the above-mentioned working surface) of the sheet to be cleaned SC in a non-contact state and generally parallel to it.

The first mesh plate 72 has a mesh shape in a plan view, and is made of expanded metal (for example, a metal plate is expanded by making cuts in a staggered manner using an expander and expanding it. It is a mesh-like member in which the cuts are formed into a rhombus or hexagonal shape, but instead, it may be, for example, a wire mesh (for example, a member made into a mesh by weaving a plurality of metal wires). This first mesh plate 72 is attached to and fixed to the scaffold 20.

For example, when a large piece of paint film attached to the sheet to be cleaned SC falls from the sheet to be cleaned SC, each opening of the first mesh plate 72 is opened to the opening of the first mesh plate 72. It has a size that allows it to pass through each opening of the plate 72.

<Paint film fragment collection sheet assembly>

As shown in FIG. 21, the first removing device 32 further removes large-sized pieces (for example, floating particles and floating objects) from among the plurality of coating film pieces separated from the sheet to be cleaned SC by air blowing. For collection, a paint film chip collection sheet assembly 74 having a generally hexahedral shape is provided.

A first work space WS1 is defined inside this paint film piece collection sheet assembly 74. As shown in FIG. 26(a), this paint film piece collection sheet assembly 74 completely surrounds the hexahedral first work space WS1, and thus constitutes an example of a "first enclosure". .

As shown in FIG. 3(a), the paint film fragment collection sheet assembly 74 completely covers the first working space WS1 by folding a plurality of sheets or removably joining them together using a fastener or the like. It is three-dimensional so that it surrounds you from all directions.

As shown in FIG. 4A, the coating film piece collection sheet assembly 74 is partitioned into an upper body 76 and a lower body 78 with the feeding path FP as a boundary.

The upper body 76 includes a top plate 80, a front plate 82, a rear plate 84, and left and right side plates 86, 86, and does not have a bottom plate. On the other hand, the lower body 78 includes a bottom plate 90, a front plate 92, a rear plate 94, and left and right side plates 96, 96, and does not have a top plate. This paint film piece collection sheet assembly 74 is positioned with respect to the scaffolding 20 such that the bottom surface (non-existent surface) of the upper body 76 is disposed below the feeding path FP.

In the upper body 76, a top plate 80, a front plate 82, a rear plate 84, and left and right side plates 86, 86 are all configured as flexible sheets.

Among these plates, the front plate 82, the rear plate 84, and the left and right side plates 86, 86 are all a plurality of plates floating in the first working space WS1 by air blowing onto the sheet to be cleaned SC in the first removal step S3. In order to prevent the paint film pieces from scattering outside the first working space WS1, it is constructed as an air-impermeable sheet. The front plate 82, the rear plate 84, and the left and right side plates 86, 86 are all examples of "scattering prevention means."

On the other hand, the top plate 80 is configured as a (porous) mesh sheet having a plurality of openings so that the air blow can be dissipated into the outside air, that is, gas can be vented.

On the other hand, in the lower body 78, the bottom plate 90, the front plate 92, the rear plate 94, and the left and right side plates 96, 96 are all configured as flexible sheets.

Among these plates, the front plate 92, the rear plate 94, and the left and right side plates 96, 96 are made of air-impermeable sheets in order to prevent the floating paint film pieces from scattering outside the first working space WS1. Consisted of.

Most of the plurality of coating film pieces separated from the sheet to be cleaned SC fall directly from the sheet to be cleaned SC by their own weight and land on the bottom plate 90, or even if there is only a small number, they are floating. Later, it falls due to its own weight and lands on the bottom plate 90, and in any case, it ultimately lands on the bottom plate 90 and is accumulated. Therefore, the bottom plate 90 is also made of an air-impermeable sheet.

As shown in FIG. 7A, the lower end of the horizontal strip of the front plate 82 of the upper body 76 is partially cut off to form a horizontally elongated flap. Similarly, the horizontal strip-shaped lower end of the rear plate 84 of the upper body 76 functions as the exit opening/closing door 102. Here, the "opening/closing door" is a movable piece that can be equated with, for example, a curtain, curtain, or blind.

In the front plate 82, a horizontal bending line BL is formed as a hinge between the entrance opening/closing door 100 and the part above it, so that the entrance opening/closing door 100 can be bent in the part above it in response to external force. On the other hand, bending starting from the bending line BL is promoted.

Specifically, as shown in FIG. 2(b), the entrance opening/closing door 100 is always in a closed state where it hangs down due to its own weight and closes the front plate 82, so that the first work space WS1 is closed. Obstructed.

On the other hand, when the sheet to be cleaned SC approaches the outer surface of the entrance door 100 from the upstream side and the downstream end of the sheet to be cleaned SC comes into contact with the outer surface of the entrance door 100, the sheet to be cleaned SC moves forward. The entrance opening/closing door 100 bends due to the force, and as a result transitions to an open state in which the front plate 82 is partially opened.

At this time, the lower end of the entrance door 100 contacts the surface of the sheet to be cleaned SC, so the entrance door 100 is bent only at an angle sufficient to allow the sheet to be cleaned SC to pass through, and the front plate 82 is wasted. This prevents a large area from being opened for an unnecessarily long time.

Similarly, the exit opening/closing door 102 is always in a closed state where it hangs down due to its own weight and closes the rear plate 84, thereby closing the first work space WS1.

On the other hand, when the sheet to be cleaned SC approaches the inner surface of the outlet opening/closing door 102 from the upstream side, and eventually the downstream end of the cleaning sheet SC comes into contact with the inner surface of the exit opening/closing door 102, the sheet to be cleaned SC moves forward. The force causes the exit opening/closing door 102 to bend from the bending line BL as a starting point, and as a result transitions to an open state in which the rear plate 84 is partially opened.

At this time, the lower end of the exit door 102 comes into contact with the surface of the sheet to be cleaned SC, so the exit door 102 is bent only at an angle sufficient to allow the sheet to be cleaned SC to pass through, and the rear plate 84 is wasted. This prevents a large area from being opened for an unnecessarily long time.

As shown in FIG. 1, when the sheet to be cleaned SC passes through the paint film fragment collection sheet assembly 74 in the feeding direction, both the entrance opening/closing door 100 and the exit opening/closing door 102 are in the open state with respect to the cleaning sheet SC. However, as described above, the entrance opening/closing door 100 and the exit opening/closing door 102 prevent the front plate 82 and the rear plate 84 from opening over an unnecessarily large area.

Therefore, the floating paint film pieces are prevented from passing through the respective opening areas of the entrance opening/closing door 100 and the exit opening/closing door 102 and leaking into the outside air.

This paint film piece collection sheet assembly 74 is discarded after use, for example.

<First injection unit 40>

As shown in FIG. 21, the first removal device 32 further includes a dry type first injection unit 40 that injects compressed gas toward the sheet to be cleaned SC. As shown in FIGS. 21 and 27, the first injection unit 40 has a frame-shaped body in which a plurality of tubes 104 are connected by a plurality of joints 106.

The tube 104 and the joint 106 cooperate with each other to form a continuous flow path, to which an external pneumatic source 108 is connected via a hose (not shown). A nozzle 110 is connected downward to each joint 106, and air is injected from the nozzle 110 in a conical or fan shape.

As shown in FIGS. 21 and 27, the first injection unit 40 has two straight parts 112, 112 facing each other in parallel, and each straight part 112 has a plurality of nozzles 110. They are lined up in a straight line with a gap between them. As a result, the first injection unit 40 has two rows of multiple nozzles 110.

As shown in FIG. 21, the first injection unit 40 crosses the feed path FP above the feed path FP (above the sheet to be cleaned SC), and has two nozzle rows that emit air blow downward. It is removably suspended horizontally on the scaffolding 20 so as to be attached to the scaffolding 20.

<Second removal device 34>

<Second mesh plate 116>

As shown in FIG. 21, the second removal device 34 has a second mesh plate 116 that faces the lower surface (the above-mentioned working surface) of the sheet to be cleaned SC in a non-contact state and generally parallel to it. The second mesh plate 116 has a mesh shape in plan view, and is made of reinforcing mesh, but may instead be made of wire mesh, for example. This second mesh plate 116 is also attached and fixed to the scaffolding 20 similarly to the first mesh plate 72.

Each opening of the second mesh plate 116 is arranged such that, for example, when a small piece of paint film attached to the sheet to be cleaned SC falls from the sheet to be cleaned SC, the piece of paint film is inserted into the second mesh plate 116. It has a size that allows it to pass through each opening of the plate 116. Each opening of this second mesh plate 116 may be smaller than each opening of the first mesh plate 72, for example.

<Cleaning water collection sheet assembly 118>

As shown in FIG. 21, the second removing device 34 further removes the cleaning water that has rebounded from the sheet to be cleaned SC and removes the size of the paint film pieces that are separated from the sheet to be cleaned by colliding with the cleaning water. In order to collect small particles and substances carrying stripping agent, a cleaning water collection sheet assembly 118 having a generally C-shaped cross-section extending back and forth is provided.

A second work space WS2 is defined inside this cleaning water collection sheet assembly 118. As shown in FIG. 28, this cleaning water collection sheet assembly 118 partially covers the hexahedral second work space WS2, that is, on three sides excluding the top, front, and rear surfaces (all non-existent surfaces). ), and thereby constitutes an example of a "second enclosing body".

As shown in the figure, the cleaning water collection sheet assembly 118 surrounds the second work space WS2 from three directions by folding a plurality of sheets or removably joining each other using a fastener or the like. It is three-dimensionalized to look like this.

As shown in the figure, this cleaning water collection sheet assembly 118 is composed of left and right side plates 120, 120 and a bottom plate 122, and has no top plate, front plate, or rear plate. This cleaning water collection sheet assembly 118 is positioned with respect to the scaffolding 20 so that the bottom plate 122 is disposed below the feed path FP. The left and right side plates 120, 120 and the bottom plate 122 are both configured as flexible sheets.

The cleaning water collection sheet assembly 118 is directly opposite and adjacent to the rear plate 84 of the upper body 76 of the coating film fragment collection sheet assembly 74 at its front surface along the feeding direction. At this time, the lower end position of the front surface and the lower end position of the rear plate 84 are substantially aligned in the horizontal direction. Thus, the cleaning water collection sheet assembly 118 is fluidly isolated from the paint chip collection sheet assembly 74 by the rear plate 84 of the paint chip collection sheet assembly 74.

In a state in which the cleaning water collection sheet assembly 118 is adjacent to the paint film fragment collection sheet assembly 74 in the feeding direction, there must be a gap between the two so large that leakage of harmful substances is expected. Sometimes, a sealing member to close the gap is installed so as to straddle the cleaning water collection sheet assembly 118 and the paint film fragment collection sheet assembly 74.

The sealing member is configured, for example, as a transverse member having a horizontal surface below it so as not to disturb the feed path FP. As a result, the feed path FP is substantially continuous from the paint film fragment collection sheet assembly 74 to the cleaning water collection sheet assembly 118 without any gaps.

In the second working space WS2, the second removal device 34 injects cleaning water from the high-pressure cleaning gun 42 targeting the entire sheet SC to be cleaned or a portion that requires cleaning, and collides with the target. The collided cleaning water carries larger pieces of the plurality of paint film pieces and the stripping agent generated by the collision.

The cleaning water as a transport medium either directly passes through each through-hole of the sheet to be cleaned SC (through-hole of each eyelet 66) and falls, or it bounces off the sheet to be cleaned SC and floats, and eventually it is carried by its own weight. It is expected that it will fall and then pass through each through hole of the sheet to be cleaned SC and fall. In any case, if the cleaning water that has been affected by the unnecessary substances on the sheet to be cleaned SC (used cleaning water that has fulfilled its mission of separating and peeling from the sheet to be cleaned SC) falls, the cleaning water finally lands on the bottom plate 122 of this cleaning water collection sheet assembly 118.

The bottom plate 122 has a mortar shape and is generally in the shape of an inverted pyramid or cone such that it hangs down the most at the waste water outlet 124 located generally in the center. As a result, no matter where the used washing water lands on the bottom plate 122, it ultimately collects at the waste water outlet 124 due to its own weight and the action of the slope of the bottom plate 122.

This cleaning water collection sheet assembly 118 is also discarded after use, for example, similarly to the aforementioned paint film fragment collection sheet assembly 74.

<High pressure washing gun 42>

As shown in FIG. 21, the second removal device 34 further includes a high-pressure cleaning gun 42 as an example of a "high-pressure injector" that manually injects cleaning water at high pressure toward the sheet to be cleaned SC by an operator.

The high-pressure cleaning gun 42 may have a structure common to the cleaning gun 216 disclosed in Patent Document 3, and is configured to spray cleaning water at high pressure from a spray nozzle.

In one example, like the cleaning gun 216, this high-pressure cleaning gun 42 has a trigger as an operating tool that is operated with one hand of the operator, and the high-pressure cleaning gun 42 is turned on and off according to the amount of operation of the trigger. and a flow rate adjustment valve that adjusts the flow rate. The above injection nozzle is selected to perform, for example, conical injection or fan-shaped injection (see FIG. 27(c)).

<Second injection unit 46>

As shown in FIG. 21, the second removal device 34 further includes a dry second injection unit 46 that injects compressed gas toward the sheet to be cleaned SC. This second injection unit 46 has a common structure with the above-described first injection unit 40, so a redundant explanation will be omitted.

As shown in FIG. 21, the second injection unit 46 crosses the feed path FP above the feed path FP (above the sheet to be cleaned SC), and has two nozzle rows that emit air blow downward. In addition, each nozzle row is removably suspended horizontally on the scaffolding 20 so as to extend in the width direction of the feed path FP.

As described above, this second injection unit 46 has the same structure as the first injection unit 40 described above, but in terms of use, after the sheet to be cleaned SC is washed with water, the second injection unit 46 is a first injection unit having the purpose of separating and removing large-sized paint film pieces from the sheet to be cleaned SC in that the sheet to be cleaned SC is drained by blowing air onto the sheet to be cleaned SC; It is different from 40.

<Working floor 126>

As shown in FIG. 21, the second removal device 34 further includes a work floor 126 as a scaffolding board on which a worker performs high-pressure cleaning work in an upright position in the second work space WS2. As shown in FIG. 29, the work floor 126 is, in one example, configured as a longitudinal hollow assembly of a plurality of square timbers, angle timbers, etc., and a mesh board 128 is attached to the surface thereof. There is. The mesh plate 128 is manufactured using, for example, the aforementioned expanded metal.

As shown in FIG. 21, the work floor 126 is removably installed horizontally on the scaffold 20 above the second injection unit 46 and across the feed path FP.

FIG. 30 is a front view showing the second removal device 34 together with several filter tanks attached thereto.

In the second work space WS2, at the installation position of the work floor 126, from top to bottom, the work floor 126, the sheet to be cleaned SC stretched across the pair of guide wires 62, 62 in an expanded state, and the second mesh-shaped The plate 116, the support (eg, horizontal bar) 136, and the bottom plate 122 of the cleaning water collection sheet assembly 118 are aligned.

The used cleaning water flowing out from the sheet to be cleaned SC lands on the bottom plate 122, flows down along the bottom plate 122, collects at the waste water outlet 124, and then passes through the drain pipe 138 to the equipment for the coagulation process. be transferred. In one example, the equipment for the aggregation process is configured such that a primary coagulation filter tank 140 and a secondary coagulation filter tank 142 are connected in series.

[Fifth embodiment]

Next, a fifth exemplary embodiment of the present invention will be described. However, for elements that are common to the fourth embodiment described above, the same reference numerals will be cited to omit redundant explanation, and only different elements will be explained in detail.

<Differences from the fourth embodiment>

In the fourth embodiment described above, the sheet to be cleaned SC is manually fed by the operator along the feeding path FP while being guided by the sheet guide mechanism 30.

On the other hand, in the sheet cleaning system 148 according to the present embodiment, the sheet SC to be cleaned is automatically (in some cases, according to a remote operation by an operator) using the sheet feeding device 132 having a power source. sent along. Therefore, according to this embodiment, it is possible to unattend the operation of feeding the sheet to be cleaned SC.

Furthermore, in the fourth embodiment described above, the high-pressure cleaning gun 42 manually sprays cleaning water onto the surface of the sheet to be cleaned SC by the operator.

In contrast, in the system 148 according to the present embodiment, the high-pressure injector 152 is automatically (in some cases, under remote control by an operator) covered with cleaning water using an injector moving device 150 that has a power source. Spray onto the surface of the cleaning sheet SC. Therefore, according to the present embodiment, it is possible to perform the high-pressure cleaning operation of the sheet to be cleaned SC unmanned.

<Unmanned/automated sheet feeding>

As shown in FIG. 31(a), in order to automate the feeding of the sheet to be cleaned SC, the system 148 according to the present embodiment additionally adds a sheet that does not exist in the fourth embodiment to the fourth embodiment. A feeding device 132 is provided, and a sheet guide mechanism 130 having a different structure is provided.

In short, the present embodiment is equipped with a transmission device for transmitting the rotational force of a motor as a power source to the sheet to be cleaned SC as a propulsive force along the feeding direction of the sheet SC. This is different from the fourth embodiment.

<Sheet guide mechanism 130>

As shown in FIG. 4A, the sheet guide mechanism 130 includes two conveyor belts 154, 154 each extending in the feeding direction as an example of an "endless track body". These two conveyor belts 154, 154 are operated in synchronization with each other.

This sheet guide mechanism 130 further includes a pulley set comprising a driving pulley (an example of a "driving rotating body") 156 and a driven pulley (an example of a "following rotating body") 158, around which each conveyor belt 154 is wound in a tensioned state. It is equipped with The driving pulley 156 and the driven pulley 158 are positioned and attached to the scaffolding 20 so as to be separated from each other in the feeding direction.

The two conveyor belts 154, 154 are arranged relative to the sheet to be cleaned SC so as to face each other from below (or from above) on both sides of the sheet to be cleaned. As shown in FIG. 2B, a plurality of projections (engaging projections, convex portions, etc.) 160 are discretely arranged in a line on the surface of each conveyor belt 154. These protrusions 160 fit into a plurality of through holes 162 (grommets 66) formed discretely in a line on each side of the sheet to be cleaned SC.

Therefore, in a state where each protrusion 160 is fitted into the corresponding through hole 162, the sheet to be cleaned SC does not move relative to the scaffold 20 in either the feeding direction or the left/right direction. Therefore, in this embodiment, the sheet guide mechanism 130 is configured by the two conveyor belts 154, 154 and the pulley set, and the plurality of through holes 162 of the sheet to be cleaned SC are It is configured using a method that uses

<Sheet feeding device 132>

As shown in FIG. 5A, the sheet feeding device 132 includes a motor 164 as a power source, a reducer 166, and a shaft 168 as a member that transmits the output of the reducer 166 to the drive pulley 156 as rotational force. It is equipped with The motor 164 is driven by electrical energy from a power source (not shown). The motor 164 can be started and stopped, reversed, accelerated and decelerated according to instructions from the operator.

<Automation of high pressure injection>

As shown in FIG. 32(a), the system 148 according to the present embodiment uses a power source to automatically spray cleaning water from a high-pressure injector 152 onto the sheet to be cleaned, in order to automate high-pressure cleaning of the sheet to be cleaned SC. An injector moving device 150 is provided that moves the injector in the width direction of the sheet to be cleaned SC while injecting the injector at high pressure toward the SC.

<Injector moving device 150>

As shown in FIG. 2A, the injector moving device 150 includes a high-pressure injector 152 having an injection nozzle 170. The high pressure injector 152 is connected to an external water pressure source 174 via a flexible hose 172.

The injector moving device 150 further includes a base support 176, which is attached to the scaffolding 20 so as to be placed at a predetermined position in the second work space WS2 in a posture that traverses the sheet to be cleaned SC. It is removably suspended horizontally.

As shown in FIG. 4B, the injector moving device 150 further includes a linear guide 178 for slidably mounting the high-pressure injector 152 on the base support 176. The linear guide 178 includes, on the base support 176, a rail 180 that extends linearly in the width direction (left-right direction) of the sheet to be cleaned SC, and a slider 182 that slidably fits into the rail 180. The slider 182 moves integrally with the high pressure injector 152. Here, the rail 180 is an example of a "track body," and the linear guide 178 is an example of a "coupling mechanism."

As shown in FIG. 4C, the injector moving device 150 further includes an injector propulsion device 184. The injector propulsion device 184 includes a motor 186 as a power source and a conversion mechanism 188 that converts the output of the motor 186 into the propulsive force of the high-pressure injector 152. An example of motor 186 is an electric motor.

An example of the conversion mechanism 188 is a mechanism that converts the rotation of the motor 186 into the endless rotation of a belt 190 and applies the propulsive force of the linear portion 196 of the belt 190 to the high-pressure injector 152. In this example, the belt 190 is wound around a drive pulley 192 and a driven pulley 194 that are separated in the direction of movement of the high-pressure injector 152, and one of the two straight portions 196, 196 of the belt 190 , high pressure injector 152 are mechanically coupled to each other.

In this embodiment, in one example, the controller 204 controls the motor 186 in accordance with commands issued in real time from an on-site worker or preprogrammed commands, thereby controlling the high pressure injector 152 in the left and right direction. It is possible to advance, stop, or retreat the high-pressure injector 152 and to control the flow rate control mechanism of the high-pressure injector 152, thereby controlling the injection amount of the high-pressure injector 152. In this case, the controller 204 scans the entire surface of the sheet to be cleaned SC by reciprocating the high-pressure injector 152, and controls the injection amount of the high-pressure injector 152 according to the position of the high-pressure injector 152 at each moment. is possible.

In one example, the controller 204 moves the high-pressure injector 152 in the left-right direction to a target position and stops it, and at the stopped position, the high-pressure injector 152 injects at a target injection amount for a target time. is possible. In this case, it is possible to locally high-pressure wash one target area of the sheet to be cleaned SC, or to sequentially locally high-pressure wash a plurality of target areas of the cleaning sheet.

[Sixth embodiment]

Next, a sixth exemplary embodiment of the present invention will be described. However, for elements that are common to the fourth embodiment described above, the same reference numerals will be cited to omit redundant explanation, and only different elements will be explained in detail.

FIG. 33 shows, in a table format, the correspondence between a plurality of steps constituting the sheet cleaning method according to the present embodiment and a plurality of elements constituting the sheet cleaning system used to implement the sheet cleaning method. It is expressed as.

<Differences from the fourth embodiment>

This embodiment differs from the fourth embodiment described above in the following several points.

1. As shown in the table format at the top of FIG. 33, the third removal process S5 is performed in the third work space WS3 located at the third position P3 downstream from the second position P2 in the feed path FP. It is executed independently from S4.

2. As shown in the figure, the new fourth removal step S6 uses the fourth removal device 206 in the fourth work space WS4 located at the fourth position P4 downstream from the third position P3 on the feed path FP. After the sheet to be cleaned SC has been drained, the sheet to be cleaned SC is beaten out with a brush and/or sucked using a suction tool.

According to this fourth removal step S6, fine paint film fragments and sharp objects attached to or entangled with the fibers of the sheet to be cleaned SC, which could not be separated and removed from the sheet to be cleaned SC in the step executed upstream, are removed. It is possible to remove such coating film fragments from the sheet to be cleaned SC by the impact force of a brush or the suction force of a suction tool.

In one example, as conceptually illustrated in the functional block diagram at the bottom of the figure, the fourth removal device 206 is configured to include a motor-driven rotating brush device used in a vacuum cleaner head. The motor-driven rotary brush device includes a motor 207, a brush 208 rotated (for example, rotated) by the motor 207, and a rotating brush 207 that knocks out paint film fragments (solid matter) from the sheet to be cleaned SC. It is configured to include an air pump 209 (an example of a "suction tool") that sucks the air.

In the several embodiments described above, the first removal device 32 and the second removal device 34 of each sheet cleaning system 10, 148 are fixed in the space when viewed from the side, while the sheet to be cleaned SC is , in a side view, by being moved relative to space, relative movement between the two in the feeding direction is realized.

Alternatively to some of the embodiments described above, the first removal device 32 and the second removal device 34 of each sheet cleaning system 10, 148 are moved relative to the space in side view while The present invention may be implemented in such a manner that the SC is fixed in space when viewed from the side, thereby realizing relative movement between the two in the feeding direction.

In this aspect, when the first removal device 32 and the second removal device 34 each have equipment that has a common structure (for example, the first injection unit 40 and the second injection unit 46), one equipment is used as the It may be used to execute the first removal step S3 and the second removal step S4. In that case, the number of parts in each sheet cleaning system 10, 148 is reduced.

Several embodiments have been described above in which the present invention is applied to cleaning used sheets used in wastewater treatment for wet paint film stripping work, but these are merely examples, and the present invention is used for other purposes, such as buildings (houses, buildings, etc.), steel towers that are long and narrow structures constructed using steel frame structures (e.g., power transmission towers, communication towers, etc.) without the use of stripping agents. ), civil engineering structures (bridges, etc.), ships, vehicles (automobiles, trains, etc.), airplanes, and other structures or cleaning of surfaces of structures where wastewater that may contain harmful substances is generated during the work. It is possible to apply this method to cleaning used sheets.

Some of the exemplary embodiments of the present invention have been described above in detail based on the drawings, but these are merely examples, and those skilled in the art will be able to understand the embodiments including the embodiments described in the above [Summary of the Invention] column. It is possible to implement the present invention in other forms with various modifications and improvements based on knowledge.

In order to solve the same problem, according to another aspect of the present invention, there is provided a wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after its use, comprising:
A flocculation device that flocculates the target substance in the wastewater as flocculation flocs using a powder or granular flocculant added to the wastewater,
The flocculation device is
a coagulation tank containing the wastewater;
two first stirring shafts, each of which is arranged in parallel with a longitudinal gap extending substantially vertically in the aggregation tank, with each shaft extending substantially vertically;
The first stirring shafts are rotated so that two corresponding first stirring blades or two groups of first stirring blades rotate in the same direction, thereby causing the first stirring blades to correspond to the gaps among the wastewater in the coagulation tank. a driving source that generates a downward spiral in or around the part so as to have a depression opening to the liquid level of the waste water;
A dosing device that accommodates the flocculant and has a dosing start area of the coagulant facing the liquid surface, and is capable of injecting the flocculant into the wastewater from the dosing start area, wherein the dosing starts. The area shall be arranged with respect to the flocculation tank so as to correspond to the area where the depression occurs.
A wastewater treatment system is provided that includes:
In order to solve the same problem, according to yet another aspect of the present invention, a powder or granular flocculant is used to flocculate the target substance in the flocculation tank as flocculation flocs. A device for adding water to raw water within
two first stirring shafts, each of which is arranged in parallel with a longitudinal gap extending substantially vertically in the aggregation tank, with each shaft extending substantially vertically;
The first stirring shafts are rotated so that two corresponding first stirring blades or two groups of first stirring blades rotate in the same direction, thereby causing the first stirring blades to correspond to the gaps in the raw water in the coagulation tank. a driving source that generates a downward spiral in or around the part so as to have a depression opening to the liquid surface of the raw water;
A dosing device that accommodates the flocculant and has a dosing start area of the coagulant facing the liquid surface, and is capable of injecting the flocculant into the wastewater from the dosing start area, wherein the dosing starts. The area shall be arranged with respect to the flocculation tank so as to correspond to the area where the depression occurs.
A flocculant addition device is provided.
In order to solve the same problem, according to yet another aspect of the present invention, a powder or granular flocculant is used in the flocculant to flocculate the target material in the flocculant as flocculation flocs. A method of adding to raw water within
Each of the two first stirring shafts, which are arranged in parallel with each other with a longitudinal gap extending substantially vertically in the coagulation tank, are connected to two or two groups of corresponding first stirring shafts. The first stirring blades are rotated so as to rotate in the same direction, thereby creating a depression in which a downward spiral is opened to the liquid level of the raw water in a portion of the raw water in the flocculation tank corresponding to the gap or around it. a rotation process of generating the
a charging step of charging the flocculant toward the recess of the spiral;
A flocculant addition method is provided.
In order to solve the same problem, according to yet another aspect of the present invention, there is provided a wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after its use, comprising:
A flocculation device that flocculates target substances in the wastewater as flocs using a powdery or granular flocculant added to the wastewater to separate solid and liquid,
The flocculation device is
a coagulation tank containing the wastewater;
two first stirring shafts, each of which is arranged in parallel with a longitudinal gap extending substantially vertically in the aggregation tank in a posture extending substantially vertically;
The first stirring shafts rotate two or two groups of first stirring blades corresponding to each other in the same direction, thereby creating a downward swirl in or around a portion of the wastewater that corresponds to the gap. produced to have a depression opening to the liquid level of the wastewater,
A wastewater treatment system is provided in which the flocculant is dropped towards the recess of the vortex and is then drawn in by the vortex and settled towards the bottom of the flocculation tank.

In order to solve the same problem, according to another aspect of the present invention, there is provided a wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after its use, comprising:
A flocculation device that flocculates the target substance in the wastewater as flocculation flocs using a powder or granular flocculant added to the wastewater,
The flocculation device is
a coagulation tank containing the wastewater;
two first stirring shafts, each of which is arranged in parallel with a longitudinal gap extending substantially vertically in the aggregation tank, with each shaft extending substantially vertically;
The first stirring shafts are rotated so that two corresponding first stirring blades or two groups of first stirring blades rotate in the same direction, thereby causing the first stirring blades to correspond to the gaps among the wastewater in the coagulation tank. a driving source that generates a downward spiral in or around the part so as to have a depression opening to the liquid level of the waste water;
A dosing device that accommodates the flocculant and has a dosing start area of the coagulant facing the liquid surface, and is capable of injecting the flocculant into the wastewater from the dosing start area, wherein the dosing starts. arranged with respect to the flocculation tank such that a region corresponds to the region where the depression occurs.
In order to solve the same problem, according to yet another aspect of the present invention, a powder or granular flocculant is used to flocculate the target substance in the flocculation tank as flocculation flocs. A device for adding water to raw water within
two first stirring shafts, each of which is arranged in parallel with a longitudinal gap extending substantially vertically in the aggregation tank, with each shaft extending substantially vertically;
The first stirring shafts are rotated so that two corresponding first stirring blades or two groups of first stirring blades rotate in the same direction, thereby causing the first stirring blades to correspond to the gaps in the raw water in the coagulation tank. a driving source that generates a downward spiral in or around the part so as to have a depression opening to the liquid surface of the raw water;
A dosing device that accommodates the flocculant and has a dosing start area for the coagulant facing the liquid surface, and is capable of injecting the flocculant into the raw water from the dosing start area, wherein the dosing starts. and an apparatus for adding a flocculant that is arranged with respect to the flocculating tank so that the area corresponds to the area where the depressions occur.
In order to solve the same problem, according to yet another aspect of the present invention, a powder or granular flocculant is used in the flocculant to flocculate the target material in the flocculant as flocculation flocs. A method of adding to raw water within
Each of the two first stirring shafts, which are arranged in parallel with each other with a longitudinal gap extending in the vertical direction in the aggregation tank, are arranged in a posture extending in the vertical direction in the coagulation tank, respectively. The first stirring blades are rotated so as to rotate in the same direction, thereby creating a depression in which a downward spiral is opened to the liquid level of the raw water in a portion of the raw water in the flocculation tank corresponding to the gap or around it. a rotation process of generating the
A method for adding a flocculant is provided, which includes the step of charging the flocculant toward the recess of the spiral.
In order to solve the same problem, according to yet another aspect of the present invention, there is provided a wastewater treatment system for recovering and treating cleaning water sprayed onto the surface of a structure as wastewater after its use, comprising:
A flocculation device that flocculates target substances in the wastewater as flocs using a powdery or granular flocculant added to the wastewater for solid-liquid separation,
The flocculation device is
a coagulation tank containing the wastewater;
two first stirring shafts, each of which is arranged in parallel with a longitudinal gap extending substantially vertically in the coagulation tank in a posture extending substantially vertically;
The first stirring shafts rotate two or two groups of first stirring blades corresponding to each other in the same direction, thereby creating a downward swirl in or around a portion of the wastewater that corresponds to the gap. produced to have a depression opening to the liquid level of the wastewater,
A wastewater treatment system is provided in which the flocculant is dropped towards the recess of the vortex and is then drawn in by the vortex and settled towards the bottom of the flocculation tank.

Claims (9)

A wastewater treatment system for collecting and treating cleaning water sprayed onto the surface of a structure as wastewater after its use, the system comprising:
A flocculation device that flocculates target substances in the wastewater as flocs using a powdery or granular flocculant added to the wastewater to separate solid and liquid,
The flocculation device is
a coagulation tank containing the wastewater;
two first stirring shafts, each of which is arranged in parallel with a longitudinal gap extending substantially vertically in the aggregation tank in a posture extending substantially vertically;
The first stirring shafts rotate two or two groups of first stirring blades corresponding to each other in the same direction, thereby creating a downward swirl in or around a portion of the wastewater that corresponds to the gap. produced to have a depression opening to the liquid level of the wastewater,
The flocculant is dropped toward the recess of the vortex, and is then drawn in by the vortex and settled toward the bottom of the flocculation tank. The flocculation device further includes at least one second stirring shaft attached to the flocculation tank,
2. The at least one second stirring shaft rotates each corresponding at least one second stirring blade, thereby dispersing the flocculant drawn in by the vortex within the wastewater. wastewater treatment system. The two or two groups of first stirring blades corresponding to the two first stirring shafts each include an upper stirring blade disposed at a position close to the liquid level of the wastewater in the coagulation tank,
2. The upper stirring blade is attached to the corresponding stirring shaft so that its position in the axial direction can be adjusted when the stirring shaft is assembled, so that the distance in the vertical direction from the liquid level can be adjusted. wastewater treatment system. The two or two groups of first stirring blades respectively corresponding to the two first stirring shafts include lower stirring blades disposed near the bottom of the coagulation tank,
The lower stirring blade is used to supplementally accelerate the flocculant drawn in by the swirl to promote the diffusion of the flocculant, and to collect the flocculant and the sediment on the bottom of the flocculation tank. The wastewater treatment system according to claim 1, wherein the wastewater treatment system is used for at least one of the following purposes: promoting re-diffusion of materials containing the flocs. The aggregation device further includes:
a drain formed at the bottom of the flocculation tank;
A filtration bag installed in the flocculation tank, which filters the wastewater in the process of draining the wastewater injected into the filtration bag from the drain;
A spacer installed between the bottom of the filtration bag and the drain, the spacer creating a gap between the bottom of the filtration bag and the drain so that at least a liquid component of the wastewater can pass through the gap. The wastewater treatment system according to claim 1, further comprising: a drain that prevents clogging of the drain by forming the drain. The wastewater treatment system uses a stripping agent to remove an existing paint film from the surface of the structure, and then uses the stripping agent to clean the surface of the structure after the stripping agent is applied to the surface of the structure. The wastewater treatment system according to claim 1, wherein the wastewater treatment system is used to collect and treat cleaning water sprayed onto the surface of a structure as wastewater after use. 7. The wastewater treatment system of claim 6, wherein the target material is selected from the group consisting of lead, chromium, asbestos, and PCBs. A granular material stirring/mixing system that adds granular material to a liquid and stirs or mixes the granular material, the system comprising:
a tank containing the liquid;
one stirring shaft or a plurality of stirring shafts arranged close to each other in parallel, arranged in a posture extending substantially in the vertical direction in the tank;
Rotating the one or more stirring shafts and rotating stirring blades coaxially therewith, thereby creating a depression in the liquid contained in the tank that opens a downward spiral to the surface of the liquid. generate to have,
The powder or granular material is dropped toward the recess of the spiral,
A powder stirring/mixing system in which the dropped powder is drawn in by the swirl and settled toward the bottom of the tank. A granular material stirring/mixing method in which granular material is added to a liquid and stirred or mixed, the method comprising:
By rotating one stirring shaft or a plurality of stirring shafts arranged close to each other in a substantially vertical direction within the tank containing the liquid, and rotating the stirring blade coaxially with the stirring shaft, the inside of the tank is a step of generating a downward spiral in a liquid contained in the liquid so as to have a depression opening to the surface of the liquid;
a dropping step of dropping the granular material toward the depression of the generated swirl;
and a settling step of drawing the dropped powder and granular material into the swirl and settling it toward the bottom of the tank.

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