JP2003300077A - Waste water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste water treatment apparatus, the object of which can waste water containing hazardous materials such as dioxins and heavy metals and solid materials capable of efficiently and reliably removing the hazardous materials upon efficiently separating the solid materials in a form permitting an easy detoxification treatment, which is extremely simple in apparatus configuration and can be easily transferred. <P>SOLUTION: The apparatus has an inclined separator 1 for separating and removing the coarse grain solids in the waste water W<SB>0</SB>, a precipitation tank 2 for precipitating the fine grain solids, a reaction flocculation tank 3 having a reaction tank section 31 and a flocculation tank section 33 to insolubilize and flocculate the heavy metal components, a precipitation separation tank 4 for the floc, filters 5A and 5B for capturing suspended particles, and an active carbon adsorber 6. The liquid of the waste water is allowed to flow down into the tank 2 by a slatted drainboard-like water passage port 12 of an inclined path 10 of the inclined separator 1 and the coarse grain solids failing to pass the same are discharged from a discharge port 13 at the bottom end of the inclined path 10. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus used for treating wastewater containing heavy metals and dioxins and solids such as wastewater for cleaning waste combustion furnaces and wastewater for cleaning waste from a waste combustion furnace.

[0002]

2. Description of the Related Art In recent years, environmental pollution due to dioxin, which is an extremely toxic and mutagenic substance, has become a serious social problem, and its control measures have become an urgent issue. This dioxin is generally generated by the thermal decomposition of chlorine-containing substances such as vinyl chloride resin contained in municipal waste and industrial waste materials when they are incinerated, and this is released to the atmosphere along with fly ash. However, the lower the combustion temperature, the more likely it is to occur, especially when the combustion temperature is 6
It is said that it is remarkably generated at a temperature of 00 ° C. or lower, but is hardly generated at a high temperature of higher than 800 ° C. because the decomposition further proceeds.

However, most of the old garbage incineration facilities
Due to the structure and processing capacity of the combustion furnace, high temperature incineration cannot be performed, and it is a source of dioxin. Therefore, in order to protect the environment, existing waste incineration facilities that cannot be incinerated at high temperatures must immediately stop operation and be remodeled to allow high temperature incineration, or the combustion furnace must be dismantled and discarded.

However, since the inside wall of the combustion furnace in operation, the flue, the chimney, etc., which is covered with the refractory material, is polluted with a large amount of harmful substances such as dioxins and heavy metals attached thereto. It is necessary to remove the harmful substances attached during the remodeling work and the dismantling work. In the removal of this harmful substance, the contaminated part is surrounded by a pipe material or a strong sheet to completely shield it from the external environment, and special filters are used to prevent the scattering of the harmful substance to the outside. so,
A worker wearing special protective clothing can remove the contaminated refractory material from the surface by using high-pressure jet water (usually at a water pressure of 300 Kg).
It is common to crush and wash with a jet etc. of about 1 / cm ² ) to wash away harmful substances together with water.

However, since the above washing wastewater naturally contains a high concentration of harmful substances, it is collected and collected in a pit or the like and used for wastewater treatment. However, crushed materials of refractory materials and furnace materials, incinerated ash, dust, etc. Since a large amount of solid substances are mixed, in order to purify to a harmless and clear and dischargeable state, it is possible to remove harmful substances such as dioxins and heavy metals without being disturbed by these solid substances, and A difficult treatment operation is required to separate the substance from the wastewater in a form that can be easily detoxified.

In view of the above-mentioned circumstances, the present invention includes, as a wastewater treatment device, harmful substances such as dioxins and heavy metals and solid substances like the above-mentioned cleaning wastewater of a refuse incineration facility and cleaning wastewater of a waste incineration facility. We provide wastewater that efficiently separates solids into a form that is easy to detoxify, can remove harmful substances efficiently and reliably, and has a very simple device configuration that can be easily relocated. The purpose is to do.

[0007]

In order to achieve the above object, a wastewater treatment apparatus according to claim 1 of the present invention is a wastewater containing heavy metals, dioxins and solid matter, as indicated by reference numerals in the drawings. Gradient separator 1 for separating and removing coarse solids S1 in W ₀ , settling tank 2 for precipitating fine solids S2 in wastewater that has passed through the slanting separator 1, and liquid W in the settling tank 2.
A reaction coagulation tank 3 for introducing ₁ to insolubilize and flocculate heavy metal components in the liquid, a settling separation tank 4 for settling and separating flocs F in the liquid sent from the reaction coagulation tank 3, and the settling separation tank 4 Filters (cartridge filters) 5A and 5B for passing suspended liquid W ₂ of the above-mentioned solution W ₂ and activated carbon adsorber 6 for adsorbing and separating harmful components in the liquid that has passed through the filter The inclined separator 1 supplies the wastewater W ₀ supplied from the wastewater introduction port (introduction nozzle) 11 to the inclined path 1.
0, and flow down to the opening 20a of the sedimentation separation tank 2 arranged below through the child-like water passage 12 of the cage provided on the bottom surface of the inclined path 10, and the coarse particle solid S1 that does not pass through the water passage 12 Is configured to be discharged from the lower end discharge port 13 of the inclined path 10, and the reaction coagulation tank 3 includes a reaction tank section 31 for reacting with a chemical agent and a coagulation tank section 33 for flocculating with a coagulant. It adopts the configuration that it has.

According to the waste water treatment apparatus having the above structure, the coarse solid matter S1 mixed in the waste water W ₀ is first separated and removed in the inclined separator 1, and then the fine solid matter S2 is also precipitated in the settling tank 2. The liquid W _{1 which} is separated and contains suspended particles that have not precipitated with dioxin and heavy metal ions is the reaction coagulation tank 3
Sent to. In the reaction coagulation tank 3, the heavy metal component in the liquid W ₁ reacts with the chemical in the reaction tank section 31 and is insolubilized, and then aggregates and coarsens in the coagulation tank section 33, and the floc F in the next settling separation tank 4 As it accumulates at the bottom. So, hydrophobic and sparingly soluble dioxin
Part of the coarse solids S1 and fine solids S2 are separated from the flocs F, and the rest is the liquid W _{2 in the} sedimentation separation tank 4.
Although it is present in a state of being adsorbed to the suspended particles therein, most of it is filtered and separated together with the suspended particles in the next filters 5A and 5B, and a trace amount of residual components is also separated by adsorption in the last activated carbon adsorber 6. . As a result, the treated water W _{3 that} has passed through the activated carbon adsorber 6 does not contain dioxins, heavy metals, and solids, and can be discharged to the outside as harmless and clear purified water.

According to a second aspect of the present invention, in the wastewater treatment apparatus according to the first aspect, the inclined separator 1 is formed in a tubular shape as a whole, and one end of the inclined separator 1 is vertically rotated to a supporting base (precipitation tank 2). It is supposed to be provided with a vibration applying means 7 which is pivotally supported as much as possible and which is vertically moved on the other end side. With this configuration,
By vibrating the inclined separator 1 by the vibration imparting means 7, the coarse solids S1 that do not pass through the child-shaped water inlet 12 of the cage are lifted by the vibration, so that the child-shaped water inlet 12 of the cage is prevented from being clogged. The coarse-grained solid matter S1 rolls downward along the slope of the inclined path 10 to promote discharge from the lower end discharge port 13.

According to a third aspect of the present invention, in the wastewater treatment device according to the first or second aspect, the inclined separator 1 has a wastewater inlet 11 having a nozzle shape, and wastewater ejected from the wastewater inlet 11 is stored in a cage. The collision plate 14 is provided to collide and disperse before the water passage 12. In this case, the wastewater W ₀ is dispersed by the collision with the collision plate 14 and spreads over the entire slope 10.

According to a fourth aspect of the present invention, in the wastewater treatment apparatus according to any of the first to third aspects, the slanted child-like water inlet 12 of the inclined separator 1 is detachably attached to the opening 15 at the bottom of the inclined path 10. The cage child member 16 is fitted, and the cage child member 16 is configured such that a plurality of rods 16b ... Along the inclination direction of the inclination path 10 are fixed to a frame body 16a at regular intervals. In this case, according to the particle size and amount of the solid matter mixed in the waste water W ₀ to be treated, the cage member 16 can be replaced with one having an appropriate mesh roughness.

A fifth aspect of the present invention is the wastewater treatment apparatus according to any one of the first to fourth aspects, wherein the settling tank 2 is a settling tank section 20 for settling the fine solid matter S2, and the settling tank section 20. Water landing tank part 2 for storing more overflowing liquid
1, and a bag-shaped filter cloth 22 opened upward is detachably installed in the settling tank portion 20. In this configuration, the fine solids S2 are precipitated in the filter cloth 22, so that when the precipitation is accumulated to some extent, the filter cloth 22 can be taken out, subjected to a detoxification treatment such as high temperature heating, and then disposed of.

According to a sixth aspect of the present invention, in the wastewater treatment apparatus according to any of the first to fifth aspects, a plurality of cartridge filters 5A, 5 having different mesh roughness as the filter are used.
B is provided, and the supernatant liquid W ₂ of the sedimentation / separation tank 4 is sequentially passed through these cartridge filters 5A and 5B from the side having a larger mesh size. In this case, suspended particles to which dioxin has adhered can be efficiently captured by two-step filtration, and the filter is used as a cartridge filter 5.
Since they are independent as A and 5B, they can be easily installed, relocated, transported and replaced.

According to a seventh aspect of the present invention, in the wastewater treatment apparatus according to any of the first to sixth aspects, the reaction coagulation tank 3 is
An adjustment tank unit 32 is provided between the reaction tank unit 31 and the agglomeration tank unit 33 to adjust the pH of the liquid after the reaction, and these tank units 31 to 33 are provided as a single tank body with a partition wall 3
The tanks 31 to 33 are integrally provided side by side via a and 3b, and liquid is moved between the tank portions 31 to 33 by overflow from the upper portions of the partition walls 3a and 3b. In this case, each unit operation of the reaction between the heavy metal component and the chemical agent, the insolubilization by adjusting the pH of the reaction product, and the flocculation by the agglomeration of the insolubilized particles is continuously carried out in each of the tank parts 31 to 33 with the liquid movement due to the overflow. While efficient, the tank parts 31 to 33 are integrated into one tank body, so that they can be easily installed, removed, and transported.

The invention of claim 8 is the waste water treatment apparatus according to any one of claims 1 to 7, further comprising a pre-filtration storage tank 81 for temporarily storing the supernatant liquid W ₂ overflowing from the settling separation tank 4. , Treated water W ₃ that has passed through the activated carbon adsorber 6
And a purified water tank 82 for storing the water, and both tanks 81, 82 are integrally provided on one tank body 8 via a partition wall 8a, and the stored liquid in the pre-filtration storage tank 81 is pumped through a pump P3. The filter 5A, 5B is configured to forcibly pass water. In this case, the forced filtration of water causes the filter 5
While the treatment efficiency in A, 5B and the activated carbon adsorber 6 can be increased, the pump P3 is stopped and the filters 5A, 5B and The activated carbon adsorber 6 can be replaced, and the treated water W ₃ accumulated in the purified water tank 82 can be reused as cleaning water. Both tanks 81 and 82 are
Since the base tank body 8 is integrated, it can be easily installed, removed, and transported.

According to a ninth aspect of the present invention, in the wastewater treatment apparatus according to any of the first to eighth aspects, a plurality of chemical liquids to be supplied to the reaction coagulation tank 3 are separate chemical liquid tanks 9A to 9D.
In addition, all of the chemical liquid tanks 9A to 9D are stored in one holding base frame 90. With this configuration, the plurality of chemical liquid tanks 9A to 9D corresponding to a plurality of types of chemical liquids can be handled as an integrated body, so that the installation, removal, and transportation thereof are easy, and at the same time, depending on the composition and properties of the wastewater W ₀ . The chemicals used can be easily changed by exchanging the chemical liquid tanks 9A to 9D.

According to a tenth aspect of the present invention, in the waste water treatment apparatus according to any one of the first to ninth aspects, the waste water W ₀ is cleaning waste water of a refuse combustion facility or demolition waste cleaning waste water of a refuse combustion facility. With this configuration, it is possible to efficiently perform wastewater treatment by treating the cleaning wastewater of the waste combustion facility or the dismantling cleaning wastewater of the waste combustion facility.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a wastewater treatment apparatus according to the present invention will be specifically described below with reference to the drawings. 1 is a schematic front view of the entire wastewater treatment device, FIG. 2 is a schematic plan view of the same, FIG. 3 is a schematic diagram showing a front stage of a treatment process by the same wastewater treatment device, and FIG. 4 is a schematic diagram showing a rear stage of the treatment process. Fig. 5, Fig. 5 is a plan view of the waste water introducing part, and Fig. 6 is a vertical side view of the waste water introducing part. In this wastewater treatment device, a flexible hose is used for moving the liquid between the respective constituent parts, but the flexible hose is not shown in FIGS. 1 and 2 in order to avoid complication in the drawings.

In FIG. 1 and FIG. 2, 1 is an inclined separator that serves as a waste water introduction part, 2 is a settling tank having a settling tank part 20 and a water landing tank part 3, and 3 is a horizontally long plate mounted on a pedestal 30. Rectangular parallelepiped reaction coagulation tank, 4 cylindrical sedimentation separation tank, 5
A and 5B are cartridge filters, 6 is a tower type activated carbon adsorber, 8 is a pre-filtration storage tank 81 and a purified water tank 82.
And 9A to 9D are chemical tanks housed in the holding base frame 90, C is a control box that controls the operation of the wastewater treatment device, and D is located below the lower end discharge port 13 of the inclined separator. It is a drum.

As shown in FIGS. 4 and 5, the slant separator 1 constitutes a slanting path 10 of a rectangular tube shape with a slant as a whole, and the slanting separator 1 is turned up and down to a settling tank 2 via a pivot shaft 17 at its lower part. The upper plate 1a is movably pivotally supported and is supported at its upper part via a vibration applying means 7 installed on the settling tank 2, and the upper plate 1a can be detached as a cover plate by screwing. The ramp 10 has a gentle slope on the upper side and a short entrance 1.
0a, an intermediate separation section 1 having a steeper and longer slope than the introduction section 1a
0b and a discharge portion 10c that is steeper and shorter on the lower side, the introduction portion 10a is located on the water landing tank portion 21 of the sedimentation tank 2, and the separation portion 10b is the opening portion of the sedimentation tank portion 20 of the sedimentation tank 2. 20a, and the discharge part 10c projects to the side of the settling tank 2.

A nozzle support frame 22 is fixedly installed upright on the side surface of the settling tank 2 on the side of the water arrival tank portion 21, and three water guide nozzles 11 are provided on a horizontal bar 22a at the top of the nozzle support frame 22. Is attached, and the tip of each water guide nozzle 11 projects inward from an inlet hole 18 provided in the upper end plate 1b of the inclined separator 1. In addition, a collision plate 14 is arranged in the inclined path 10 in front of the separating portion 10b. The direction of the tip of each water guide nozzle 11 can be adjusted by the rotational position of the horizontal bar 22a, and the collision plate 14 is also supported by the spindle 1.
The angle can be adjusted by the rotational position of 4a.

On the other hand, the bottom of the separating portion 10b of the slope 10 is provided with a child-like water passage 12 of a cage. This water passage 1
2 is composed of a child member 16 of a cage that is detachably fitted in an opening 15 on the bottom surface of the separating portion 10b. And
The child member 16 of the cage is provided with a rectangular frame 16a and a ramp 10.
A plurality of rod members 16b ... Are attached parallel to each other at regular intervals by welding. In addition,
The rods 16b of the cage member 16 are made of stainless steel rods having a circular cross section, a square shape, an inverted triangle shape, an inverted truncated cone shape, or the like, and their mutual intervals are set within a range of about 0.5 to 5 mm.

In the vibration imparting means 7, a roller 72 mounted on the lower surface of the upper portion of the tilt separator 1 is in contact with a cam wheel 71 which is rotationally driven by a motor 7a, and the tilt separator is rotated as the cam wheel 71 rotates. 1 is configured so as to vibrate up and down about a pivot 17 on the lower side.

The settling tank 2 is, as shown in FIGS. 4 and 5,
An inverted quadrangular pyramid trapezoidal settling tank section 20 and a vertically long rectangular parallelepiped landing tank section 21 are mounted on a carriage 23.
Both tank parts 20 and 21 are in contact with each other at the upper part of the side surface, and a laterally long slit-shaped overflow port 25 that communicates the inside of both tank parts 20 and 21 is opened in this contact part. Then, the bag-shaped filter cloth 22 opened upward is loaded in the settling tank portion 20. This filter cloth 22 has its opening edge fixed to a rectangular frame 22a, and has hooking pieces 22b provided at a plurality of positions of the rectangular frame 22a on the inner circumference of the upper part of the settling tank section 20. By being hooked on 26, the lower end is held in a state of being separated from the inner bottom of the settling tank portion 20. Further, an underwater pump P1 is installed in the landing tank portion 21, and the liquid therein is sent to the reaction coagulation tank 3 by its operation.

It should be noted that the slope 10 of the slope separator 1 has a width that is approximately 1/2 the width of the settling tank portion 20 of the settling tank 2, as shown in FIG.
As shown in FIG. 5, the settling tank 2 is installed on one side (rear side). Then, as shown in FIG. 2, the cover plate 27 is provided in the substantially half portion of the opening 20a of the settling tank portion 20 that is removed from the inclined path 10 and in the approximately half portion of the water landing tank portion 21 that is removed from the inclined path 10. Is covered.

The reaction coagulation tank 3 is divided into a reaction tank section 31 on one end side, an intermediate adjustment tank section 32 and a coagulation tank section 33 on the other end side through partition walls 3a and 3b. To 33, a propeller type agitator 34 is installed, and a reaction tank section 31 and an adjustment tank section 3 are installed.
A PH meter 35 is also installed in 2. Then,
The liquid sent from the water landing tank portion 21 of the settling tank 2 via the submersible pump P1 is first introduced into the reaction tank portion 31, and in the reaction tank portion 31, the chemical liquid tanks 9A, 9
After reacting with the chemical liquid supplied from B, it flows over the partition wall 3a and flows into the adjacent adjustment tank portion 32.
The pH is adjusted by the chemical liquid supplied from the chemical liquid tank 9C at, and then flows into the aggregating tank portion 33 over the partition wall 3b, and the floc F is generated by the chemical liquid supplied from the chemical liquid tank 9D at the aggregating tank portion 32, Then, it is introduced into the sedimentation separation tank 4 through the conduit 37 from the outflow port 36 of the aggregation tank section 32.

The chemical liquid tanks 9A to 9D are housed in a box-shaped holding base frame 90, and each of them is a propeller-type stirrer 9.
1 is installed and each chemical is supplied to the reaction coagulation tank 3 via the pump P2.

The settling / separation tank 4 comprises a bottomed vertical cylindrical outer cylinder 41 constituting the main body thereof, an inner cylinder 42 arranged concentrically in the outer cylinder 41 and opened vertically, and an outer cylinder 41. A conduit 37 from the coagulation tank part 32 of the reaction coagulation tank 3 communicates with the inner cylinder 42. Further, overflow ports 44 to the annular overflow passage 43 are opened at a plurality of positions on the upper end of the outer cylinder 41, and an outlet 45 is provided at the bottom of the annular overflow passage 43. P3 is a suction pump for extracting the flocs F from the bottom of the sedimentation tank 4.

Pre-filtration storage tank 81 and purified water tank 82
Is integrated as the tank body 8 as described above, but both are completely separated by the partition wall 8a. Then, the liquid W ₂ flowing out from the outlet 45 of the sedimentation separation tank 4 is introduced into the pre-filtration storage tank 81, sent to the first cartridge filter 5A via the submersible pump P4 installed therein, and then the second cartridge filter 5A. The two-cartridge filter 5B and the activated carbon adsorber 6 are sequentially passed, and the purified water W ₃ is introduced into the purified water tank 82.

Here, the first cartridge filter 5A
Is a filter medium 50 in the cylindrical container 50, for example, the roughness 50.
μm, but the second cartridge filter 5B is 1
The activated carbon adsorber 6 has an activated carbon layer 6a loaded therein. In addition, the purified water tank 82
The upper overflow drain 83 and the valved drain 8 at the bottom
And 4 are provided. In FIG. 4, G indicated by a virtual line is an external drainage channel, and P5 indicated by a broken line is a submersible pump P5 installed in the purified water tank 82 when the treated water W ₃ is used as washing water.

The submersible pumps P1, P4 and P5 installed in each of the water landing tank portion 21, the pre-filtration storage tank 81 and the purified water tank 82 of the settling tank 2 have a liquid level defined by a level switch. It is set to automatically drive when the liquid level is reached, and to automatically stop when the liquid level drops to a specified height due to the liquid transfer by this driving.

According to the wastewater treatment apparatus having the above-mentioned configuration, the wastewater containing harmful substances and solids such as dioxins and heavy metals, such as cleaning wastewater of the refuse incineration facility and cleaning wastewater of the waste incineration facility, is treated as a target. From the collected waste water tank, etc., or when the waste water treatment device is installed near the waste water generation site, send it to the water guiding nozzle 11 via the pump P0 from the waste water collecting part such as the pit as shown in FIG. After that, processing will be automatically and efficiently performed thereafter.

That is, as shown in FIG. 6, the wastewater W ₀ injected from the water guiding nozzle 11 into the inclined separator 1 first hits the collision plate 14 to be dispersed and spread over the entire inclined path 10 to separate the separation portion. The liquid containing the harmful substance dissolved in the fine particle solid S2 flows into the sedimentation tank portion 20 of the sedimentation tank 2 below through the childlike water passage 12 of the cage. Since the angle of the collision plate 14 is variable, the angle can be set to an appropriate dispersion state according to the injection intensity of the waste water W ₀ in the water guide nozzle 11. On the other hand, the water passage 12
Coarse-grained solids S2 such as brick pieces that do not pass through the
It moves downward along the gradient of, is discharged from the lower end discharge port 13 and is collected in the drum can D. Further, in this process, by vibrating the tilt separator 1 by the vibration applying means 7,
Since the coarse solids S1 that do not pass through the water passage 12 float up due to vibration, clogging of the child-like water passage 12 of the cage is prevented, and the coarse solids S1 roll and move to the lower end discharge port 13 Is promoted.

In the settling tank section 20 of the settling tank 2, the fine solids S2 in the wastewater that has flowed down from the cage-shaped water passage port 12 settle, but since the filter cloth 22 is arranged in the settling tank section 20. The precipitate is captured in the filter cloth 22, and only the liquid W ₁ containing dioxin and heavy metal ions and suspended particles that have permeated the filter cloth 22 is located next to the overflow port 25 in the water tank part 2.
Inflow to 1. Then, the liquid in the water landing tank portion 21 is reacted by the submersible pump P1 into the reaction tank portion 3 of the reaction coagulation tank 3.
Sent to 1.

The coarse solids S collected in the drum D
No. 1 is subjected to detoxification treatment such as high temperature heating to decompose dioxin, and then disposed of. In addition, the fine granular solids S2 captured by the filter cloth 22 are also taken out together with the filter cloth 22 when they have accumulated to a certain extent, subjected to a detoxification treatment by incineration at high temperature, and then disposed of.

In the reaction tank portion 31 of the reaction coagulation tank 3, the liquid W ₁ sent from the water landing tank portion 21 of the precipitation tank 2 is
The heavy metal fixative solution supplied from the drug tank 5A and, for example, a sulfuric acid band (inorganic coagulant) solution supplied from the drug tank 5B are stirred and mixed, and the heavy metal component in the liquid W ₁ reacts with the heavy metal fixative, This reaction liquid overflows to the adjacent adjustment tank section 32. In the adjustment tank section 32, the medicine tank 5
For example, a certain amount of P supplied from C by a caustic soda solution
The reaction product of the reaction is adjusted to H, and the reaction product by the reaction is precipitated as colloidal particles of an insoluble compound and aggregates, and the liquid containing the colloidal particles overflows to the aggregation tank unit 33. Then, in the aggregation tank unit 33, the medicine tank 5
The flocculating agent solution supplied from C further aggregates the colloidal particles of the insoluble compound to form a large grown floc F, and the liquid containing the floc F flows from the outlet 36 to the sedimentation separation tank 4 through the conduit 37. To do.

As the heavy metal fixing agent to be supplied to the reaction tank section 31, Zn, Cd, Cu, Pb, H has been used conventionally.
Commercially available chemicals generally used for treating wastewater containing heavy metals such as g, Cr, Ni, Fe and Mn may be used. In addition to the above-mentioned heavy metal fixing agent solution and sulfuric acid band solution, a reducing agent solution such as hypo (sodium thiosulfate) for reducing hexavalent chromium to trivalent chromium is added to the reaction tank section 31 for PH setting. Alternatively, dilute sulfuric acid may be added, or an iron salt solution such as ferric chloride may be used instead of the sulfuric acid band solution as the inorganic coagulant. Of course, drug tanks will be prepared for each drug used. Then,
When the cleaning wastewater of the refuse incineration facility is to be treated, the reaction tank unit 31 is set to about PH4, and the adjustment tank unit 32 is set to about PH7. The aggregating agent supplied to the aggregating tank portion 33 is not particularly limited, but an anionic polymer aggregating agent is usually used.

In the settling separation tank 4, the flocs F in the liquid sent into the inner cylinder 42 through the conduit 37 settle and accumulate at the bottom, and the supernatant liquid W ₂ overflows from the upper part of the outer cylinder 41 into an annular overflow. It moves to the path 43 and flows out from the overflow port 44 to the pre-filtration storage tank 81. In this sedimentation separation tank 4, the inner space is divided into the inner space and the outer space by the inner cylinder 42.
The liquid sent into the inner cylinder 42 descends in the inner cylinder 42,
After going over the lower end of 2, the flow goes up to the annular overflow passage 43, which promotes the sedimentation of the flocs F, and the inner downflow and the outer upflow do not mix with each other. The supernatant liquid W ₂ flowing out to the annular overflow passage 43
Flock F is less likely to get inside. Then, the flocs F accumulated at the bottom of the sedimentation tank 4 are sucked by the suction pump P.
It is extracted and collected in 3, and is disposed of after undergoing required detoxification treatment such as dehydration and high temperature heating.

At the stage of flowing into the pre-filtration storage tank 81, the covered heavy metals contained in the original wastewater W ₀ are almost removed. On the other hand, since dioxin is hydrophobic and sparingly soluble, a part of the coarse solids S1 and the fine solids S are used.
2 and Floc F are separated, but the residue remains adsorbed on the suspended particles. However, the liquid W ₂ accumulated in the pre-filtration storage tank 81 is forcibly forced by the submerged pump P4 into the first and second cartridge filters 5A,
5B and the activated carbon adsorber 6 are sequentially sent to trap and remove suspended particles exceeding 50 μm in the first cartridge filter 5A and then 10 μm in the second cartridge filter 5B.
Suspended particles exceeding m are captured and removed, and finer suspended particles are also adsorbed and separated in the final activated carbon adsorber 6.

Therefore, the treated water W ₃ that finally flows into the purified water tank 82 does not contain dioxin, heavy metals, and solids and is harmless and clear purified water, and the drain outlet 84 with a valve at the bottom is opened as it is. Can be discharged to an external drainage channel G or a general river, and when the wastewater treatment device is installed near the wastewater generation site, it can be pumped up by the submersible pump P5 and reused as washing water. In addition, at the time of this reuse, the drainage port 84 with a valve at the lower part is closed to store water, but the surplus water is overflowed at the upper overflow port 83.
To the outside.

The filtration capacity of the first and second cartridge filters 5A and 5B and the adsorption capacity of the activated carbon adsorber 6 reach their limits, and when they are replaced, the pre-filtration storage tank 81 is used.
While continuing the wastewater treatment up to the sedimentation separation tank 4 using the capacity of the above, the pump P3 can be stopped to perform the replacement work. However, the number of cartridge filters is not limited to two, and it is possible to add more than three cartridge filters, for example, by adding a filter having a mesh size of 5 μm after the second cartridge filter 5B. The coarseness of each filter medium can be appropriately selected according to the properties of the wastewater W ₀ . On the other hand, also for the activated carbon adsorber 6, a plurality of groups can be used if necessary.

In the wastewater treatment equipment of the above-mentioned embodiment, since the cage-shaped water passage port 12 of the inclined separator 1 is composed of the independent cage child member 16, the particle size and amount of the solid matter mixed in the wastewater W ₀ to be treated are controlled. Correspondingly, the child member 16 of the cage can be replaced with one having an appropriate mesh size. Moreover, by having three water-conducting nozzles 11 as the wastewater inlet of the inclined separator 1,
It becomes possible to simultaneously treat the wastewater sent from the maximum three water collecting parts or three wastewater tanks. On the other hand, in the settling tank 2, when the fine-grained solid matter S2 to be settled is directly deposited in the settling tank 20, it takes a lot of labor and time to remove and collect sludge. If sludge is taken out together with the filter cloth 22 interposed between the two, the work efficiency can be dramatically improved because removal and recovery can be performed very easily and safely in a short time.

In the construction of this embodiment, however, the reaction coagulation tank 3 is provided with the reaction tank section 31, the adjustment tank section 32 and the coagulation tank section 33, and the liquid moves between these tank sections 31 to 33 due to overflow. Therefore, each unit operation of reaction of heavy metal components, insolubilization by adjusting the pH of the reactant, and flocculation by aggregation of insolubilized particles is automatically and continuously performed efficiently, and one tank unit 31 to 33 is provided. Since it can be handled as a tank body, it can be easily installed, removed, and transported. Further, a plurality of chemical liquid tanks 9A to 9 corresponding to a plurality of chemical liquids
Since D can be handled in a state where the whole is stored in the holding base frame 90, its installation, removal, and transportation are easy, and the wastewater W
Changes use drugs in accordance with the ₀ composition and properties liquid tank 9
It can be easily done by exchanging A to 9D. Furthermore, since the pre-filtration storage tank 81 and the purified water tank 82 are also integrated as one tank body 8, they can be easily installed, removed and transported.

In the wastewater treatment apparatus of the present invention, the column tanks are independently separated for each treatment step such as separation of solid matter in wastewater, reactive aggregation of heavy metal components, sedimentation separation of flocs, filtration separation, and adsorption removal. Since these arrangement configurations can be set freely, it is not restricted by the size and space of the installation site, and it is possible to construct a wastewater treatment system even in a narrow space or in the presence of various obstacles, and to reduce the size of tower tanks. Since the entire wastewater treatment equipment can be easily transported by loading it on a truck, etc., and can be easily installed without the need for a large crane truck, etc., it can be temporarily used at a wastewater generation site such as a waste incineration facility or its dismantling site. A wastewater treatment system can be constructed and treated, and after the treatment is completed, it can be removed and moved to a new washing wastewater generation site, which allows flexible response that was not possible with conventional wastewater treatment equipment. .

The wastewater treatment apparatus of the present invention is intended to treat wastewater containing heavy metals, dioxins and solids, and there is no restriction on the properties and types of other components contained in the wastewater treatment equipment. It has high applicability as a wastewater treatment for dismantling and cleaning of combustion facilities. Therefore, the detailed configuration of the wastewater treatment apparatus of the present invention can be modified in various ways other than the embodiments.

[0046]

According to the first aspect of the present invention, waste water containing harmful substances and solids such as dioxins and heavy metals is treated like the above-mentioned waste water for cleaning waste incineration facilities and waste water for dismantling waste incineration facilities. As a wastewater treatment device, an inclined separator that separates and removes coarse solids through a child-like water passage in a cage, a settling tank that precipitates fine solids, a reaction flocculation tank that insolubilizes and flocks heavy metal components, and flocs. From the provision of a sedimentation separation tank for sedimentation separation, a filter for capturing suspended particles in the liquid after sedimentation separation, and an activated carbon adsorber for adsorbing and separating harmful components in the liquid that has passed through the filter, Provided is one that can efficiently and reliably remove harmful substances after efficiently separating solid substances in wastewater into a form that can be easily detoxified, and has a very simple device configuration that can be easily relocated. .

According to the second aspect of the present invention, in the wastewater treatment apparatus, since the vibration imparting means of the inclined separator is provided, clogging of the child-like water passage port of the cage is prevented and the discharge of the coarse solid matter is prevented. It has the advantage of being promoted.

According to the third aspect of the present invention, in the above-mentioned wastewater treatment device, since the wastewater inlet of the inclined separator has a nozzle shape and has the collision plate for colliding the wastewater ejected from this wastewater inlet, It is possible to evenly disperse the wastewater in the wastewater introduction section to increase the separation efficiency of the coarse solid matter.

According to the fourth aspect of the present invention, in the above wastewater treatment device, since the slanted child-like water inlet of the inclined separator is constituted by an independent slanted child member, the solid matter mixed in the wastewater to be treated is mixed. According to the particle size and amount of the above, the cage member can be replaced with one having an appropriate coarseness, so that the separation efficiency of the coarse solid matter can be enhanced.

According to the fifth aspect of the present invention, in the above wastewater treatment apparatus, the settling tank is provided with a settling tank section and a landing tank section, and a bag-shaped filter cloth is detachably installed in the settling tank section. Therefore, it is possible to take out the precipitate of the fine solid matter together with the filter cloth, and the labor and time required for removing and recovering the precipitate can be significantly increased compared to the case where the fine solid matter is directly precipitated on the inner bottom of the tank. The workability is significantly improved.

According to the sixth aspect of the present invention, in the above-mentioned wastewater treatment apparatus, since a plurality of cartridge filters having different meshes are used as filters, suspended particles having dioxin attached can be efficiently separated and removed. With
There is an advantage that the filter can be easily installed, relocated, transported, and replaced.

According to the invention of claim 7, in the wastewater treatment apparatus, the reaction coagulation tank is provided with an adjustment tank section between the reaction tank section and the coagulation tank section, and these tank sections are integrated into one tank body. Since the liquid is moved between these tank parts by overflow from the upper part of the partition wall, the reaction between the heavy metal component and the drug, the insolubilization of the reactant by PH adjustment, and the flocculation by the agglomeration of the insolubilized particles are caused. The unit operation is continuously and efficiently accompanied by the liquid movement due to overflow between the tank parts, and these tank parts can be handled as one tank body, so that there is an advantage that they can be easily installed, removed, and transported. is there.

According to the eighth aspect of the present invention, in the wastewater treatment device, the pre-filtration storage tank for temporarily storing the supernatant liquid overflowing from the sedimentation separation tank and the treated water that has passed through the activated carbon adsorber are stored. The tank is equipped with a purified water tank, and both tanks are integrally attached to one tank body to forcibly pass the stored liquid in the pre-filtration storage tank to the filter through the pump. The treatment efficiency in the adsorber can be improved, and while the wastewater treatment up to the sedimentation separation tank is continued by the storage in the pre-filtration storage tank, the pump can be stopped and the filter and activated carbon adsorber can be replaced, and the purified water tank can be used. The accumulated treated water can be reused as cleaning water, and both tanks can be handled as one tank body, which is advantageous in that they can be easily installed, removed, and transported.

According to a ninth aspect of the present invention, in the above wastewater treatment apparatus, a plurality of chemical liquids to be supplied to the reaction coagulation tank are contained in separate chemical liquid tanks, and all of these chemical liquid tanks are one holding group. Since it is configured to be housed in a frame, it is possible to handle multiple chemical liquid tanks as a unit,
It has the advantages that it can be easily installed, removed, and transported, and that the chemicals used can be easily changed by replacing the chemical liquid tank according to the composition and properties of the wastewater.

According to the tenth aspect of the invention, in the above wastewater treatment device, there is an advantage that the cleaning wastewater of the refuse combustion facility or the demolition wastewater of the refuse combustion facility can be efficiently treated.

[Brief description of drawings]

FIG. 1 is a schematic front view of an entire wastewater treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the entire wastewater treatment apparatus.

FIG. 3 is a schematic view showing a front stage portion of a treatment process by the wastewater treatment device.

FIG. 4 is a schematic view showing a latter part of the processing step.

FIG. 5 is a plan view showing a wastewater introduction part of the same wastewater treatment device with a slope plate and a cover plate of a sedimentation tank part removed.

FIG. 6 is a vertical cross-sectional side view of the wastewater introducing unit.

[Explanation of symbols]

1 Inclined Separator 10 Inclined Path 11 Inlet Nozzle (Wastewater Inlet) 12 Slant Water Passage 13 of Slender Bottom 13 Outer Bottom 14 Collision Plate 15 Opening 16 Slender Child 16a Frame 16b Bar 17 Spindle 20 Settling Tank 20a Opening 21 Water tank part 22 Filter cloth 3 Reaction coagulation tanks 3a, 3b Partition wall 31 Reaction tank part 32 Adjustment tank part 33 Coagulation tank part 4 Sedimentation separation tanks 5A, 5B Cartridge filter (filter) 6 Activated carbon adsorber 7 Vibration imparting means 8 Tank body 81 Pre-filtration storage tank 82 Purified water tank 9A to 9D Chemical liquid tank 90 Holding base frame F Flock P1 to P5 Pump S1 Coarse-grain solids S2 Fine-grain solids W ₀ Wastewater W ₁ Liquid W ₂ Supernatant W ₃ Treated water

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 1/62 ZAB C02F 9/00 502D 4D071 9/00 502 502H 502P 502Z 503G 503 504B 504 504E B01D 23/14 F-term (reference) 4D015 BA19 BA23 CA20 DA05 DB01 EA32 FA01 FA02 FA11 FA15 FA22 4D024 AA04 AB11 BA02 BB01 BC01 CA01 DB03 DB18 DB21 4D038 AA08 AB63 AB86 BA04 BB06 BB17 BB18 4D041 AA01 AA09 AB05 AB08 AB04 AB02 A02 AB02 AB02 AD02 4D066 A02 AD02 4D066 A02 AB02 AB02 AB02 A02 CA03 DA15

Claims (10)

[Claims] 1. A slant separator for separating and removing coarse solid matters in waste water containing heavy metals and dioxins and solid matter, and a settling tank for precipitating fine solid matters in waste water passing through the slant separator. A reaction coagulation tank for introducing the liquid of the precipitation tank to insolubilize and flocculate heavy metal components in the liquid, a settling separation tank for settling and separating flocs in the liquid sent from the reaction coagulation tank, and a settling separation tank The filter is equipped with a filter that passes the supernatant liquid to capture suspended particles in the liquid, and an activated carbon adsorber that adsorbs and separates harmful components in the liquid that has passed through the filter, and the gradient separator is a wastewater inlet. The waste water supplied from the slant is guided to the slant, and is made to flow down to the opening of the sedimentation tank disposed below through the child-shaped water passage provided in the bottom of the slant. Discharge objects from the bottom outlet of the ramp Is configured so that, the reaction flocculation tank, a reaction tank to carry out the reaction with the drug, flocculant wastewater treatment apparatus comprising and a flocculation tank unit that performs flocculation by. 2. The tilt separator is formed in a tubular shape as a whole, and has one end thereof pivotally supported by a supporting base so as to be vertically rotatable and a vibration imparting means for vertically moving the other end. The wastewater treatment device according to claim 1, wherein 3. The inclined separator comprises a collision plate in which a wastewater inlet has a nozzle shape, and the wastewater ejected from the wastewater inlet is collided and dispersed in front of a child-like water passage of a cage. The wastewater treatment apparatus according to 1 or 2. 4. The slant child-like water passage of the slant separator is constituted by a slender child member detachably fitted into an opening at the bottom of the slant, and the slender child member is provided on a frame along the slanting direction of the slant. The wastewater treatment device according to any one of claims 1 to 3, wherein a plurality of rods are fixed at regular intervals. 5. The settling tank comprises a settling tank section for settling fine solids, and a water landing tank section for storing liquid overflowing from the settling tank section, and is opened upward in the settling tank section. The waste water treatment device according to any one of claims 1 to 4, wherein the bag-shaped filter cloth is detachably installed. 6. The filter is provided with a plurality of cartridge filters having different meshes, and the supernatant of the sedimentation tank is passed through these cartridge filters in order from the side having the largest meshes. Claim 1
The wastewater treatment device according to any one of to 5. 7. The reaction coagulation tank is provided with an adjustment tank part interposed between the reaction tank part and the coagulation tank part to adjust the pH of the liquid after the reaction, and these tank parts have one tank body. 7. The wastewater treatment apparatus according to any one of claims 1 to 6, wherein the wastewater treatment apparatus is integrally installed on the partition wall and is configured to perform liquid movement between the tank parts by overflow from the upper part of the partition wall. 8. A pre-filtration storage tank for temporarily storing the supernatant liquid overflowing from the settling separation tank, and a purified water tank for storing the treated water that has passed through the activated carbon adsorber, and both tanks. Is integrally attached to one tank body via a partition wall, and is configured to forcibly pass the stored liquid in the pre-filtration storage tank to the filter through a pump. The wastewater treatment device described in. 9. The chemical solution supplied to the reaction coagulation tank is stored in separate chemical solution tanks, and all of the chemical solution tanks are stored in a single holding base frame. 8. The wastewater treatment device according to any one of 8. 10. The wastewater treatment apparatus according to claim 1, wherein the wastewater is cleaning wastewater of a refuse combustion facility or demolition cleaning wastewater of a refuse combustion facility.