Sewage coagulating sedimentation efficient defluorination device

Abstract

A sewage coagulating sedimentation efficient defluorination device comprises a polymerization reaction tank, a flocculation reaction tank, a water distribution area, a sedimentation tank and a sludge tank, the polymerization reaction tank is communicated with the flocculation reaction tank, the flocculation reaction tank is communicated with the water distribution area through a pipeline, the water distribution area is communicated with the sedimentation tank through a perforated wall, and a perforated water collection tank is installed on the upper portion of the water outlet end of the sedimentation tank. A sludge collecting hopper is arranged at the bottom of the water inlet end of the sedimentation tank and communicated with the sludge tank through a pipeline, a fluorine removal agent adding mechanism and an anion adding mechanism are arranged in the polymerization reaction tank and the flocculation reaction tank respectively, a sludge scraper is arranged in the sedimentation tank, and sludge scraper running tracks are arranged at the bottom and the top of the sedimentation tank. A sludge pump is arranged at the bottom of the sludge tank. Fluorine-containing sewage enters the sedimentation tank through polymerization reaction and flocculation reaction for mud-water separation, and fluorine ions enter sludge and are discharged from the sludge tank. According to the utility model, through the pool type structure, the coagulating sedimentation defluorination effect can be obviously enhanced, and the hydraulic load impact resistance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a device for sewage defluorination belongs to sewage treatment technical field. BACKGROUND

[0002] Coagulation sedimentation method defluorination is the most widely used defluorination process at present. Coagulation sedimentation method mainly is through adding aluminum salt, iron salt class coagulant in fluorine-containing wastewater, makes it hydrolysis in water, after through net capture, roll sweep, adsorption frame bridge and electric neutralization etc. Mode with fluorine ion destabilization, and forms flocculation and settles, after through solid-liquid separation defluorination.

[0003] At present, the problem of coagulation sedimentation method defluorination technology is that the cost is relatively high, and it is urgent to optimize the reaction pool type, improve the use efficiency of defluorination agent and reduce the operation cost. SUMMARY

[0004] The utility model discloses in view of the high cost problem existing in the prior coagulation sedimentation defluorination technology, and proposes a sewage coagulation sedimentation efficient defluorination device with low operation cost and good defluorination effect.

[0005] The sewage coagulation sedimentation efficient defluorination device of the utility model adopts the following technical scheme:

[0006] The device, including polymerization reaction pool, flocculation reaction pool, water distribution area, sedimentation tank and sludge tank, the polymerization reaction pool is communicated with the flocculation reaction pool, the flocculation reaction pool is communicated with the water distribution area through the pipeline, the water distribution area is communicated with the sedimentation tank through the perforated wall, the upper portion of the water outlet end of the sedimentation tank is installed with the parallelly arranged perforated water collecting groove, the bottom of the water inlet end of the sedimentation tank is provided with the sludge collecting hopper, the sludge collecting hopper is communicated with the sludge tank through the pipeline, the polymerization reaction pool and the flocculation reaction pool are provided with the defluorination agent adding mechanism and the anion PAM (polyacrylamide) adding mechanism respectively, the sedimentation tank is provided with the sludge scraper, and the bottom and the top of the sedimentation tank are provided with the sludge scraper running track, and the bottom of the sludge tank is provided with the sludge pump.

[0007] The polymerization reaction pool is communicated with the flocculation reaction pool through the reserved hole.

[0008] The polymerization reaction pool is communicated with the flocculation reaction pool through the reserved hole. The first-stage polymerization reaction pool is provided with the defluorination agent adding mechanism. The flocculation reaction pool is provided with the anion PAM adding mechanism. The first-stage polymerization reaction pool is provided with the paddle type stirrer, and the rest polymerization reaction pools and the flocculation reaction pools are provided with the frame type stirrer. The paddle type stirrer and the frame type stirrer adopt the variable frequency motor.

[0009] The sedimentation tank is the horizontal flow sedimentation tank.

[0010] The top of the polymerization reaction tank and the flocculation reaction tank is provided with a roof, and a photovoltaic panel is installed on the roof.

[0011] The middle and lower part of the perforated wall is provided with at least two rows of water distribution holes in a quincunx shape.

[0012] The bottom surface of the sedimentation tank is inclined from the water outlet end to the water inlet end, and the slope is 3 per thousand.

[0013] The length-width-depth ratio of the sedimentation tank is 3.4:1:0.7-3.6:1:0.7.

[0014] The sludge collecting hopper is square-conical.

[0015] An air pipe is arranged on the connecting pipeline between the sludge collecting hopper and the sludge tank, and an electric sludge discharge valve is arranged at the end of the connecting pipeline.

[0016] The fluorine-containing sewage first enters the polymerization reaction tank and fluorine removal agent is added, the fluorine removal agent and the fluoride ions in the water have a polymerization reaction, then enters the flocculation reaction tank and anionic PAM solution is added, and a flocculation reaction occurs; the sewage enters the water distribution area from the flocculation reaction tank through the pipeline, then enters the sedimentation tank through the perforated wall of the water distribution area, the sludge floc is deposited, the water and sludge are separated, the fluoride ions enter the sludge, the sewage with removed fluoride ions enters the upper layer of the sedimentation tank, and the sludge is scraped to the sludge collecting hopper by the sludge scraper and enters the sludge tank through the pipeline under the action of water level pressure difference.

[0017] The pool type structure can significantly enhance the coagulation and sedimentation fluorine removal effect, improve the anti-hydraulic load impact capacity, reduce the power consumption and optimize the water quality, and the operation cost is reduced by using photovoltaic power generation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a cross-sectional structure schematic view of the sewage coagulation and sedimentation efficient fluorine removal device.

[0019] Figure 2 is a plane structure schematic view of the sewage coagulation and sedimentation efficient fluorine removal device.

[0020] Figure 3 is a vertical structure schematic view of the first to fourth coagulation reaction tanks in the utility model.

[0021] Figure 4 is a layout schematic view of the water distribution holes of the perforated wall.

[0022] In the figure: 1. First stage polymerization reaction tank; 2. Second stage polymerization reaction tank; 3. First stage flocculation reaction tank; 4. Second stage flocculation reaction tank; 5. Water distribution area; 6. Horizontal flow sedimentation tank; 7. Sludge tank; 8. Perforated wall; 9. Sludge collecting hopper; 10. Air pipe; 11. Electric sludge discharge valve; 12. Paddle type agitator; 13. Frame type agitator, 14. Frame type agitator; 15. Frame type agitator; 16. Chain sludge scraper; 17. Perforated water collecting groove; 18. Sludge discharge pump; 19. Fluoride removal agent feeding mechanism; 20. Anionic PAM feeding mechanism; 21. Anionic PAM feeding mechanism; 22. Photovoltaic panel; 23. Water distribution hole, 24. Pipeline, 25. Pipeline. DETAILED DESCRIPTION

[0023] As shown in Figure 1 and Figure 2 , the sewage coagulation and sedimentation efficient fluoride removal device of the utility model, including first stage polymerization reaction tank 1, second stage polymerization reaction tank 2, first stage flocculation reaction tank 3, second stage flocculation reaction tank 4, water distribution area 5, horizontal flow sedimentation tank 6 and sludge tank 7. First stage polymerization reaction tank 1, second stage polymerization reaction tank 2, first stage flocculation reaction tank 3 and second stage flocculation reaction tank 4 are sequentially arranged and are communicated by the reserved hole. The first stage polymerization reaction tank 1 is provided with fluoride removal agent feeding mechanism 19, and the first stage flocculation reaction tank 3 and the second stage flocculation reaction tank 4 are provided with anionic PAM feeding mechanism 20 and anionic PAM feeding mechanism 21. Referring to Figure 3 , the first stage polymerization reaction tank 1 is installed with paddle type agitator 12, the second stage polymerization reaction tank 2 is installed with frame type agitator 13, the first stage flocculation reaction tank 3 is installed with frame type agitator 14, and the second stage flocculation reaction tank is installed with frame type agitator 15. The top of each stage polymerization reaction tank and flocculation reaction tank is provided with a roof, and the photovoltaic panel 22 is installed on the roof.

[0024] The second stage flocculation reaction tank 4 is connected with the water distribution area 5 through the pipeline 24. The water distribution area 5 and each reaction tank are provided with sludge tank 7, and the bottom of the sludge tank 7 is installed with two sludge discharge pumps 18.

[0025] The water distribution area 5 and the horizontal flow sedimentation tank 6 are communicated through the perforated wall 8, referring to Figure 4 , the lower part of the perforated wall 8 is provided with three rows of water distribution holes 23, and the water distribution holes are arranged in the shape of a quincunx.

[0026] The chain type sludge scraper 16 is installed in the horizontal flow sedimentation tank 6, and two tracks for the operation of the sludge scraper 16 are installed at the bottom and the top of the horizontal flow sedimentation tank 6. Eight parallel perforated water collecting tanks 17 are arranged at the upper part of the water outlet end of the horizontal flow sedimentation tank 6, and a sludge collecting hopper 9 is arranged at the bottom of the water inlet end of the horizontal flow sedimentation tank 6. The sludge collecting hopper 9 is in the shape of a square cone, and is connected with the sludge tank 7 through a pipeline 25. An exhaust pipe 10 is arranged at the vertical pipe of the pipeline 25, and an electric sludge discharge valve 11 is arranged at the end of the pipeline 25. The length-width-depth ratio of the horizontal flow sedimentation tank 6 is 3.4:1:0.7-3.6:1:0.7, and the bottom surface of the horizontal flow sedimentation tank 6 is inclined from the water outlet end (perforated water collecting tank 17) to the water inlet end (sludge collecting hopper 9) with a slope of 3 per thousand.

[0027] The specific process of the above device for removing fluorine from sewage is as follows.

[0028] (1) Coagulation of sewage

[0029] The fluorine-containing sewage enters the first-stage polymerization tank 1, and a fluorine removal agent is added and stirred by the paddle type stirrer 12. The fluorine removal agent reacts with the fluorine ions in the water to generate a polymerization reaction, and then enters the second-stage polymerization tank 2, and is stirred by the frame type stirrer 13 to continue the polymerization reaction. Through the two-stage coagulation reaction tanks, the polymerization reaction is fully and completely carried out.

[0030] Then, one of the following two methods is used:

[0031] A. The sewage after the polymerization reaction enters the first-stage flocculation tank 3, and anionic PAM is added and stirred by the frame type stirrer 14 to generate a flocculation reaction. Then, the sewage enters the second-stage flocculation tank 4, and is stirred by the frame type stirrer 15 to continue the flocculation reaction, and large sludge flocs are formed.

[0032] B. The polymerization reaction continues in the first-stage flocculation tank 3 by stirring with the frame type stirrer 14 (without adding anionic PAM), and anionic PAM is added in the second-stage flocculation tank 4, and is stirred by the frame type stirrer 14 to generate a flocculation reaction.

[0033] (2) Sedimentation of sewage

[0034] The sewage after the flocculation reaction enters the water distribution area 4 from the second-stage flocculation tank 4 through the pipeline 24, enters the horizontal flow sedimentation tank 6 through the perforated wall 8, and the sludge flocs are precipitated, the sludge and water are separated, the fluorine ions enter the sludge, and the fluorine ions in the upper layer of the water are removed.

[0035] The upper layer of the water in the horizontal flow sedimentation tank 6 flows out through the perforated water collecting tank 17, and the sludge at the bottom is scraped into the sludge collecting hopper 9 under the operation of the chain type sludge scraper 16.

[0036] (3) Sludge discharge

[0037] The sludge pool 7 liquid level is lower than the operation liquid level of the horizontal flow sedimentation tank 6, so the sludge in the sludge collecting hopper 9 is discharged into the sludge pool 7 through the pipeline 25 under the action of hydraulic pressure difference. By controlling the opening size of the electric sludge discharge valve 11, the amount of sludge discharge can be controlled.

[0038] (4) Photovoltaic

[0039] The electric energy generated by the photovoltaic panel 22 can be used for electric equipment such as the agitator, the sludge scraper, and the sludge pump.

Claims

1. A sewage coagulation and sedimentation high-efficiency fluorine removal device, characterized in that, The device comprises a polymerization tank, a flocculation tank, a water distribution area, a sedimentation tank and a sludge tank, the polymerization tank is communicated with the flocculation tank, the flocculation tank is communicated with the water distribution area through a pipeline, the water distribution area is communicated with the sedimentation tank through a perforated wall, the upper part of the water outlet end of the sedimentation tank is provided with parallel arranged perforated water collecting tanks, the bottom of the water inlet end of the sedimentation tank is provided with a sludge collecting hopper, the sludge collecting hopper is communicated with the sludge tank through a pipeline, the polymerization tank and the flocculation tank are respectively provided with a defluorination agent adding mechanism and an anionic PAM adding mechanism, the sedimentation tank is provided with a sludge scraper, the bottom and the top of the sedimentation tank are both provided with a sludge scraper running track, and the bottom of the sludge tank is provided with a sludge pump.

2. The sewage coagulation and sedimentation high-efficiency fluorine removal device according to claim 1, characterized in that, The polymerization tank and the flocculation tank are communicated through a reserved hole.

3. The sewage coagulation and sedimentation high-efficiency fluorine removal device according to claim 1, characterized in that, The polymerization tank is provided with at least one stage, the polymerization tanks of different stages are communicated through reserved holes, and the defluorination agent adding mechanism is arranged in at least the first polymerization tank; the flocculation tank is provided with at least one stage, the polymerization tanks of different stages are communicated through reserved holes, and the anionic PAM adding mechanism is arranged in at least the first flocculation tank.

4. The sewage coagulation and sedimentation high-efficiency fluorine removal device according to claim 3, characterized in that, A paddle type stirrer is arranged in the first polymerization tank, and a frame type stirrer is arranged in the rest of the polymerization tanks and the flocculation tanks, and the paddle type stirrer and the frame type stirrer both adopt a variable frequency motor.

5. The sewage coagulation and sedimentation high-efficiency fluorine removal device according to claim 1, characterized in that, A roof is arranged above the polymerization tank and the flocculation tank, and a photovoltaic panel is arranged on the roof.

6. The sewage coagulation and sedimentation high-efficiency fluorine removal device according to claim 1, characterized in that, At least two rows of water distribution holes are arranged in the middle and lower part of the perforated wall, and the water distribution holes are in a plum blossom shape.

7. The sewage coagulation and sedimentation high-efficiency fluorine removal device according to claim 1, characterized in that, The bottom surface of the sedimentation tank is inclined from the water outlet end to the water inlet end, and the slope is 3‰.

8. The sewage coagulation and sedimentation high-efficiency fluorine removal device according to claim 1, characterized in that, The length-width-depth ratio of the sedimentation tank is 3.4:1:0.7-3.6:1:0.

7.

9. The sewage coagulation and sedimentation high-efficiency fluorine removal device according to claim 1, characterized in that, The sludge collecting hopper is in a square cone shape.

10. The sewage coagulation and sedimentation high-efficiency fluorine removal device according to claim 1, characterized in that, An air pipe is arranged on the communication pipeline between the sludge collecting hopper and the sludge tank, and an electric sludge pump valve is arranged at the end of the communication pipeline.

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