KR20160130655A - Powerless mixing flocculation tank and dissolved air flotation device using the same - Google Patents

Abstract

The present invention relates to a powerless mixing flocculation tank and a dissolved air flotation device using the same, and more specifically, to a powerless mixing flocculation tank, which generates two or more different turbulent flows in a mixing flocculation tank into which raw water has been introduced, and thus fine particles included in the raw water are circulated by a water current and come into contact with one another to thus flocculate together in the form of masses having a predetermined size, and a dissolved air flotation device using the same. A separate powered device is not used, and thus power consumption can be reduced. An inside of the powerless mixing flocculation tank is constructed in multiple stages having different filling materials and filling densities and flow velocity can be controlled by forming turbulent flows in raw water, and thus the raw water and flocculant are uniformly mixed together, thereby increasing flocculation efficiency. Accordingly, the powerless mixing flocculation tank simultaneously implements mixing and flocculation in a front end part of a water treatment plant, thereby making overall water treatment equipment small-sized, an electric motor and a stirrer do not need to be installed, thereby reducing equipment costs, and a separate powered device is not used, thereby reducing power consumption. As a result, capital expenditures (CAPEX) and operating expenditures (OPEX) are reduced, and thus an economic effect can be achieved.

Description

[0001] The present invention relates to a non-powered mixed flocculation tank and a dissolved air floatation apparatus including the flocculation tank,

The present invention relates to a non-powered mixed flocculation tank and a dissolved air floatation apparatus using the same, wherein two or more different turbulent flows are generated in an admixed flocculation tank into which raw water flows, and even if a power unit for stirring is not separately provided, To coagulate the fine particles in a predetermined size by circulating and contacting with each other by a flow of water, and a dissolved air floating apparatus using the coagulation tank.

Generally, the suspended solids contained in the raw water in the water treatment process or the seawater desalination process should be removed to meet the water and drinking water standards. For this purpose, a water treatment process consisting of mixing basin, coagulation basin and flotation basin is used to remove suspended particulate matter.

In the mixing tank, the chemical and raw water are rapidly mixed to coagulate the finely suspended material, and the coagulated mixture is discharged to the coagulation tank. In the coagulation tank, the flocculated material primarily aggregated by the mixing tank is grown to a size capable of floating separation in the floating tank In the conventional mixing tank and the flocculation tank, the water is discharged to the floating tank disposed at the rear end. To this end, in order to form a circulating water stream for the induction of flocculation by contacting the flocculant or the auxiliary coagulant and the floating material, agitator) was installed.

In the float bath, particles float on the surface and can be collected and removed by a skimming action. That is, by adhering fine bubbles to the suspended phase contained in the dispersing medium by the physical action, it floats up to the limit surface where the dispersion medium and the air are in contact, thereby inducing solid-liquid separation.

The shape of the floating separation tank may be divided into two types depending on the method of generating fine bubbles: Dissolved Air Flotation (DAF), Dispersed Air or Cavitational Air Flotation (DaF), Induced Air Flotation IAF, Vacuum Flotation, Electro Flotation, and Microbiological Auto Flotation.

The dissolved air flotation method (DAF) is a method of sufficiently dissolving air in water at a high pressure and injecting it into raw water to be treated. When the water is decompressed in water, the supersaturated air is formed into fine bubbles, , And the bubble-floc coupler rapidly rises to the water surface in water to achieve solid-liquid separation.

Therefore, in order to remove suspended particulate matter in a water treatment process or a seawater desalination process, the injection of a drug is essential. Generally, most of the coagulants used for water treatment are formed to form a flock immediately (within 1 second) when they are added to the raw water and perform the coagulation function, so that it is possible to rapidly mix with the raw water as soon as possible after the coagulant is input It is important. This is because the coagulation efficiency is lowered when the coagulant is rapidly mixed, that is, when the coagulant is not distributed evenly throughout the raw water. Therefore, the point and method of injection at the time of coagulant injection, the flow pattern of the raw water and the structure of the mixing tank are the key elements of the design.

Mixing methods include mechanical, water flow, and pump diffusion methods. Mechanical mixing is the most commonly used mixing method in the water treatment process, and one or several mechanical mixing devices are installed in the tank or water channel. Typical design criteria are agitation strength of 300 sec ^-1 (G value), mixing time of 10 ~ 30 sec, power requirement is 2.23 ~ 2.62 hp per 10,000 m ³ / d. Mechanical rapid mixing is difficult to blend instantaneously and short circuit occurs frequently. For metal salt coagulant, blending time is too long, energy is high, and sometimes rotation shaft and gear drive are broken.

In addition, since a mechanical stirrer in the form of an impeller is installed in the mixing tank and the flocculation tank, the mechanical stirrer must be driven continuously for the sewage treatment. This increases the installation cost of the equipment and the maintenance cost of the electric power for operating the mechanical stirrer There was a problem. In addition, since the conventional full-speed mixing tank has a clogging structure in which the upper part is opened, there is a problem that when the mechanical stirrer is driven, the odor spreads to the surroundings.

Patent Document 1133174 (published on Apr. 4, 2012) is related to a self-powered mobile water treatment system using a dissolved air flotation method and a method of sub-processing an automatic control system for small and medium sized water bodies, Although a water treatment apparatus using a dissolved air floatation (DAF) is proposed for a movable vehicle having a self-powered power source so that supply is not required, the mechanical stirrer must be continuously driven for water treatment, Costs and maintenance costs to operate the mechanical stirrer.

Registered Patent No. 1133174 (Announcement of Apr. 06, 2012)

Disclosure of Invention Technical Problem [8] The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for depositing and filling different materials in an agglomerated coagulant tank to generate turbulence in raw water, A coagulation tank having a non-dynamic agitated coagulation tank for coagulating the coagulated gas to a predetermined size, and a dissolved air floating apparatus using the same.

In order to achieve the above-mentioned object, an embodiment of the present invention is a mixed flocculation tank (100) for flocculating and coagulating flocculant and raw water in raw water to form and grow floc, A first mixed flocculation unit 110 generating a high-speed turbulent flow for forming a floc primarily in the raw water filled with the first turbulent forming derivative 111; And a second turbulent-forming derivative (121) filled in the inner space to generate a slow turbulent flow at a lower rate than the first mixed flocculent for secondarily floc growing on the raw water passing through the first mixed flocculation portion 2 agglomerated agglomerate 120. The agglomerated agglomerator is a non-

In order to maintain different turbulence intensities between the first mixed coagulation part 110 and the second coagulated flocculating part 120, a porous separator (not shown) for partitioning the first coagulated flocculating part 110 and the second coagulated flocculating part 120 (130) < / RTI >

The first mixed cohesion unit 110 is provided in the upper side region of the second cohesion unit 120 so that the raw water passing through the first cohesion unit 110 is supplied to the second mixed cohesion unit 120).

The first turbulent flow-inducing material 111 may be a multilayered mesh-type material or a plurality of fiber bundles intertwined with each other.

Preferably, the second turbulent flow-inducing body 121 is formed of a plurality of pall ring type materials, and the second mixed flocculation unit 120 is a stage in which the poling type material is filled. A plurality of them may be provided separately from each other. The plurality of stages may be provided so that the packing density of the poling type material becomes smaller as the material flows toward the downstream side.

Another embodiment of the present invention is a mixed flocculation tank (100) for flocculating flocculated flocculant by adding flocculant to raw water to form and grow floc, flocculating tank (100) for inflating microbubbles in raw water to float and remove flocs The mixed flocculation tank 100 provided at the upstream end of the floatation tank 200 includes a first turbulent flow inducing unit 111 in the inner space, A first agglomerated agglomerator 110 for generating high-speed turbulence to form flocks on the raw water; And a second turbulent-forming derivative (121) filled in the inner space to generate a slow turbulent flow at a lower rate than the first mixed flocculent for secondarily floc growing on the raw water passing through the first mixed flocculation portion 2 mixed flocculation unit 120. The suspended air floatation apparatus includes a non-powered mixed flocculation tank.

An additional flocculation tank 150 provided with an agitator between the flocculation flocculation tank 100 and the flotation tank 200 is connected to the second flocculation flocculation unit 120 A bypass passage 140 may be provided at a lower portion of the first agglomerated agglomerator 100 so as to be conveyed to the rear end without passing through the first agglomerated agglomerator 100.

The first mixed cohesion unit 110 is provided in the upper side region of the second cohesion unit 120 so that the raw water passing through the first cohesion unit 110 is supplied to the second mixed cohesion unit 120).

The first turbulent flow-inducing material 111 may be a multilayered mesh-type material or a plurality of fiber bundles intertwined with each other.

Preferably, the second turbulent flow-inducing body 121 is formed of a plurality of pall ring type materials, and the second mixed flocculation unit 120 is a stage in which the poling type material is filled. A plurality of them may be provided separately from each other. The plurality of stages may be provided so that the packing density of the poling type material becomes smaller as the material flows toward the downstream side.

The present invention relates to a non-powered mixed flocculation tank and a dissolved air floatation apparatus using the same, wherein a mesh type material is inserted into the mixed flocculation tank to generate turbulence to rapidly mix and a packing material (Pall Ring) It is an apparatus for constructing two or more different turbulence intensities at the upper and lower portions by filling up and forming a continuous flocculation, and there is an advantage that power consumption can be reduced because no separate power device is used.

In addition, the present invention provides a non-powered mixed flocculation tank in a multistage form having filling materials and filling densities different from each other to form turbulent flow in the raw water to control the flow rate, thereby uniformly mixing the raw water and the flocculant, It is effective.

Therefore, the non-dynamic agitation coagulation bath can realize the miniaturization of the entire water treatment facility by simultaneously realizing the mixing and coagulation at the front end of the water treatment facility, and it is possible to reduce the cost of the equipment because there is no need to install the electric motor and the agitator, Because the device is not used, the power consumption can be reduced, which reduces the capital expenditures (CAPEX) and operating expense (OPEX), which is economical.

1 is a schematic view showing a non-powered mixed flocculation tank according to an embodiment of the present invention.
2 is a schematic diagram illustrating a non-powered agitation coagulation bath according to another embodiment of the present invention.
3 is a schematic diagram showing a dissolved air floating apparatus including a non-powered mixed flocculation tank according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical concept of the present invention.

Throughout this specification, when an element is referred to as "including" an element, it is understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Unless otherwise specified in the present specification, 'raw water' means wastewater containing various pollutants and seawater, and means a subject requiring water treatment. Accordingly, the term " fine particles " included in the raw water mentioned below refers to various kinds of contaminants such as algae, various pollutants including high concentration organic matter, and the like. The term " treated water " means a raw material having passed through stages or stages, and " coagulation " means a phenomenon in which fine particles contained in raw water are entangled by coagulant and mutual contact, In general, the term "flocculation", which indicates a phenomenon of coagulation in a larger mass, is not to be distinguished from the meaning and it should be understood in a broad sense including the same.

Hereinafter, a non-powered mixed flocculation tank and a dissolved air floating apparatus using the same according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic view showing a non-powered agitation coagulation bath 100 according to an embodiment of the present invention. More specifically, FIG. 1 is a schematic view illustrating a coagulation bath for coagulating a flocculant and raw water, In the mixed flocculation tank, the first turbulent flow forming body 111 is filled in the inner space so as to replace the function of the conventional mechanical flocculation flocculating tank, and a first mixed flocculating flocculating unit The first turbulent flow forming body 110 and the second turbulent flow forming body 121 are filled in the inner space so that a slow turbulent flow at a lower rate than the first mixed flocculating portion for secondary floc growth on the raw water passing through the first mixed flocculating portion The second agglomerated agglomerator 120 generates agglomerated agglomerate particles 120, which can circulate the particulate matter contained in the raw water internally, Is agglomerated non-motorized mixing Joe that allows aggregation into a predetermined size is shown.

The non-dynamic agitation coagulation bath 100 may further include a first agitation agglomeration unit 110 and a second agglomerated agglomeration unit 120. The non-aggressive agglomerated agglomeration tank 100 may include a first agglomerating unit 110, a second agglomerating agglomerator 120, The separation membrane 130 may further be provided.

First, the first mixed cohesion unit 110 can form a floc by circulating fine particles contained in the raw water by the turbulence generated by the raw water flowing into the first turbulent flow generating unit 111 And the upper side region may include an inflow pipe into which raw water flows.

The raw water flowing in the form of a straight water stream through the inflow pipe passes through the first turbulent flow forming body 111 filled in the first mixed cohesive portion 110 to form a rapid turbulent flow, The flocs are formed while the fine particles and the flocculant contained in the slurry contact each other. The first turbulent flow-inducing element 111 may be a multilayer structure of a plurality of mesh-type materials or a plurality of bundles of fibers intertwined with each other. Preferably, the first turbulent- The holes may be stacked asymmetrically so that the holes do not coincide vertically. Since the holes between the materials of the mesh type are stacked asymmetrically in the vertical direction, it is possible to generate turbulence while the raw water passes through the mesh type material by gravity and control the turbulence speed generated according to the size of the holes .

The second agglomerated agglomerate 120 can be formed by flowing the treated water passing through the first agglomerated agglomerate 110 through the second turbulent flow forming body 121 and by allowing the flocculant contained in the raw water to grow As the space, the lower side region may include a process water discharge pipe through which the process water containing the flux is discharged.

The second turbulent flow-forming derivative 121 is filled with a plurality of polling ring-type materials, and preferably, the plurality of pollen-type materials filled with the plurality of polling-type materials are stacked in a plurality of separated stages, Lt; / RTI >

FIG. 2 is a schematic view illustrating a non-powered agitation coagulation bath 100 including a second agglomerated agglomerator 120 in which a plurality of stages filled with poling type materials are stacked in a plurality of stages. The second agglomerated agglomerating unit 120 of the non-powered agglomerated agglomerator 100 can control the number of the plurality of separated stages in which a plurality of poling type materials are filled according to the state of the raw water, It is preferable that the plurality of stages are separated from each other and the packing density is decreased toward the downstream region because the lower the packing density, the lower the turbulent flow rate and the flocs can be grown into a larger lump to be.

The separation membrane 130 separates the first mixed flocculation part 110 and the second mixed flocculation part 120. The separation membrane 130 is a separation membrane that separates the first mixed flocculation part 110 and the second mixed flocculation part 120, Compartment to maintain speed. The first mixed cohesion unit 110 generates rapid turbulence and the second mixed cohesion unit 120 generates a slow turbulent flow to coagulate the fine particles contained in the raw water to form and grow flocs. And can be defined as the relative difference in the turbulence intensity in the mixed flocculation tank.

 Therefore, in the non-powered mixer of the present invention, the first mixed flocculation unit 110 is provided in the upstream region as compared with the second mixed flocculation unit 120, and the raw water introduced into the first mixed flocculation unit is supplied to the first turbulent- 111 of the second mixed flocculation portion to generate first turbulent flow to generate a rapid turbulence, and a plurality of flocculated flocculated flocculated flocculated flocculated flocculated flocculated flocculated flocculated flocculated flocculent flocculated flocculated flocculent flocculated It is possible to grow the flocs formed in the first agglomerated agglomerated portion due to the slow turbulence formed while passing through the first agglomerations 120a, 120b, and 120c.

FIG. 3 is a schematic view illustrating a dissolved air floatation apparatus including a non-powered mixed flocculation tank according to another embodiment of the present invention. The floatation flocculation tank includes a coagulation flocculation tank for flocculating foreign matters by injecting coagulant into raw water, A first turbulent flow inducing body 111 is filled in an inner space of the first turbulent flow inducing body 111, and the first turbulent flow inducing body 111 is filled with the first turbulent flow inducing body 111, The first mixed flocculation unit 110 for generating turbulence and the second turbulent flow forming unit 121 are filled in the inner space to form the first flocculation flocculation And a second agglomerated agglomerator 120 for generating a slow speed turbulent flow at a lower speed than that of the agglomerated agglomerator 100 can be provided at the front end of the float tank 200.

In addition, the dissolved air floating apparatus according to the present invention may further include an agitator between the mixed flocculation tank 100 and the floating tank 200 in order to sufficiently grow flocs in the raw water that has passed through the mixed flocculation tank, A bypass channel 140 may be provided to allow the additional flocculation tank 150 and the first flocculation flocculation unit 110 to be transferred directly to the additional flocculation tank 150.

The first agglomerated agglomerator 110 is provided on the upstream side of the second agglomerated agglomerator 120 and the raw water injected into the first agglomerated agglomerator can pass through the second agglomerated agglomerator due to gravity .

The dissolved air floating apparatus including the non-powered agitation flocculation tank of the present invention adjusts the number of the plurality of stages 120a, 120b and 120c of the second agglomerated agglomerate 120 according to the state of the raw water requiring water treatment, RTI ID = 0.0 > 140 < / RTI > and stirrer operation. More specifically, when the additional flocculation tank 150 is required to increase the flocculation efficiency of the flock, the agitator included in the additional flocculation tank is operated so that the first flocculated flocculation unit 110 and the second flocculation flocculation unit 120 The first flow toward the floating tank 200 via the additional flocculation tank 150 and the second flow toward the floatation tank 200 via the additional flocculation tank 150 through the bypass flow path 140 in the first flocculation flocculation unit 110 If the additional flocculation tank 150 is not needed, the operation of the stirrer is stopped, and the flocculation tank 200 is connected to the first flocculation flocculation unit 110 through the second flocculation flocculation unit 120, And the fourth flow toward the floatation vessel 200 through the bypass flow path 140 in the first mixing flocculation unit 110 can be selected and controlled.

Therefore, the flow of the treatment water can be selectively controlled to the first to fourth flows according to the state of the enemy water, the temporary problem, and the situation, and the operation cost can be reduced.

Hereinafter, an embodiment of the present invention will be described. However, the scope of the present invention is not limited to the following preferred embodiments, and a person skilled in the art can carry out various modifications of the contents described in the present invention within the scope of the present invention.

In order to confirm the usefulness of the non-motorized agglomerated tank of the present invention, the treated water discharged before and after the non-motorized agglomerated tank of the present invention was installed on the float tank front of the dissolved air floating apparatus was measured as turbidity and total suspended solids Suspended Solids, TSS) were measured.

The dissolved air floating apparatus was operated at a loading rate of 30 m / h, a recycle ratio of 10%, and a pressure of 5 bar.

Before installation after installing Turbidity
(NTU) enemy 10.3 10.3 Treated water 4.06 3 Total Suspended Solids (TSS)
(mg / L) enemy 18.8 18.8 Treated water 4 2.8

From the results of Table 1, it can be seen that the turbidity of treated water after the installation was reduced by 1.06 NTU and the TSS by 1.2 mg / L, respectively, compared with before installation of the non-powered agglomerating device.

Therefore, it was found that the fine particles contained in the raw water can be efficiently agglomerated and removed when the non-powered agglomerating and agglomerating apparatus of the present invention is installed in the floatation front end of the dissolved air floating apparatus.

100: non-motorized mixed coagulation tank
110: first mixed coagulating portion
111: First turbulent flow-forming derivative
120: second mixed cohesive portion
121: Second Turbulent Formation Derivative
130: separator
140: Bypass Euro
150: additional flocculation tank
200: Flotation tank
A: Dissolved air floating device

Claims (16)

A mixed flocculating tank (100) for flocculating a raw material and coagulating fine particles in raw water to form and grow a floc,
A first mixed flocculation unit 110 generating a high-speed turbulent flow to fill the raw water filled with the first turbulent flow inducing body 111 in the inner space and to form flocks first; And
The second turbulent flow forming body 121 is filled in the inner space to generate a slow turbulent flow at a lower rate than the first mixed flocculation portion for secondarily floc growing on the raw water passing through the first mixed flocculation portion, A mixed flocculating portion 120;
A non-motorized agglomerating tank. The method according to claim 1,
In order to maintain different turbulence intensities between the first mixed coagulation part 110 and the second coagulated flocculating part 120, a porous separator (not shown) for partitioning the first coagulated flocculating part 110 and the second coagulated flocculating part 120 (130);
Wherein the non-dynamic agglomerated coagulation bath further comprises: The method according to claim 1,
The first mixed cohesion unit 110 is provided in the upper side region of the second cohesion unit 120 so that the raw water passing through the first cohesion unit 110 is supplied to the second mixed cohesion unit 120). ≪ / RTI > The method according to claim 1,
Wherein the first turbulent-shaped derivative (111) is a multilayered mesh-type material. The method according to claim 1,
Wherein the first turbulent-shaped derivative (111) is a plurality of fiber bundles intertwined with each other. The method according to claim 1,
Wherein the second turbulent flow-generating derivative (121) is a material of a plurality of pall rings type. The method according to claim 6,
Wherein the second mixed flocculation unit (120) is provided with a plurality of stages, each of which is filled with the poling type material, separated from each other. 8. The method of claim 7,
Wherein the plurality of stages are provided such that a packing density of the poling type material becomes smaller as it goes to the downstream side. (100) for flocculating the fine particles to form and grow flocs by injecting coagulant into the raw water, and a float tank (200) for flocculating and removing flocs by injecting microbubbles into raw water. Dissolved Air Flotation (DAF) In a device A,
The mixed flocculation tank 100 provided at the upstream side of the flotation tank 200,
A first mixed flocculation unit 110 generating a high-speed turbulent flow to fill the raw water filled with the first turbulent flow inducing body 111 in the inner space and to form flocks first; And
The second turbulent flow forming body 121 is filled in the inner space to generate a slow turbulent flow at a lower rate than the first mixed flocculation portion for secondarily floc growing on the raw water passing through the first mixed flocculation portion, And an agglomerating unit (120) for agitating the mixed air. 10. The method of claim 9,
Wherein an agglomeration tank (150) provided with an agitator is provided between the mixed flocculation tank (100) and the floating tank (200). 10. The method of claim 9,
A bypass channel 140 is provided at a lower portion of the first agglomerated agglomerate 100 so that the treated water having passed through the first agglomerated agglomerator 100 can be transferred to the rear end without passing through the second agglomerated agglomerator 120 Wherein the immersion flocculating tank is provided with a non-dynamic agitation flocculation tank. 10. The method of claim 9,
The first mixed cohesion unit 110 is provided in the upper side region of the second cohesion unit 120 so that the raw water passing through the first cohesion unit 110 is supplied to the second mixed cohesion unit 120). ≪ RTI ID = 0.0 > 15. < / RTI > 10. The method of claim 9,
Wherein the first turbulent-shaped derivative (111) is a mesh-type material having a plurality of layers or a plurality of fiber bundles intertwined with each other. 10. The method of claim 9,
Wherein the second turbulent-forming derivative (121) is a plurality of pall-ring type materials. 15. The method of claim 14,
Wherein the second mixed flocculation unit (120) is provided with a plurality of stages separated from each other in a form filled with the poling type material. 16. The method of claim 15,
Wherein the plurality of stages are provided such that a packing density of the poling type material becomes smaller as it goes to the downstream side.

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