Fluorine-containing wastewater combined treatment tank and process thereof

Abstract

The invention discloses a fluorine-containing wastewater combined treatment tank and a process thereof, and belongs to the technical field of fluorine-containing wastewater treatment. The device comprises a homogenizing tank, a high-efficiency inclined plate sedimentation unit, a sludge conditioning tank and a water inlet on-line monitoring chamber, the efficient inclined plate sedimentation unit comprises a water distribution tank, a mixing tank, a flocculation tank, a sedimentation area, a sludge area, a clear water area and a water outlet channel; the combined treatment tank integrating the homogenizing tank, the water inlet on-line monitoring chamber, the efficient inclined plate sedimentation unit and the sludge conditioning tank is used for treating the fluorine-containing wastewater, various special-shaped processes can be spliced into a tank type with a regular appearance, the construction length of a sewage pipe network is shortened, the treatment efficiency is improved, the occupied area is reduced, and the construction and transportation cost is reduced; the water distribution tank is favorable for balancing the water inlet amount of the treatment system and homogenizing the water quality of the fluorine-containing wastewater, so that water distribution is more uniform, a subsequent treatment unit can operate stably, the treatment stability is improved, and the fluorine removal efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fluorine-containing wastewater treatment, and more specifically to a fluorine-containing wastewater combined treatment pool and a process thereof. Background Art

[0002] In the process of modern industrial production such as chemical industry, steel, cement, glass, smelting, etc., natural fluorine-containing minerals are used as the main raw materials or auxiliary raw materials. Especially in the production of solar panels, domestic fluorine-containing polymer backplanes are mostly used in the manufacture of photovoltaic modules. Although this material improves the durability and performance of the modules, it is difficult to recycle and treat after scrapping, which may cause environmental pollution. Fluorine-containing wastewater has a large amount of water, a wide distribution, and a large difference in fluorine concentration. The defluorination methods of fluorine-containing wastewater with different concentrations are different; fluorine-containing wastewater is usually mixed with inorganic acids, alkalis, salts, etc., which increases the difficulty of treatment. In order to protect the health and safety of the environment and meet the national fluorine-containing wastewater discharge standards, wastewater must be defluorinated before discharge. The treatment methods for fluorine-containing wastewater include precipitation, adsorption, ion exchange, electrochemical method, electrodialysis, liquid membrane method, reverse osmosis method, etc. Among them, the adsorption precipitation method is a method of adding substances with coagulation ability or chemical reaction with fluoride ions into fluoride-containing wastewater, so that the fluoride in the wastewater generates a large amount of colloids and insoluble substances, and then removes fluoride from the water body through precipitation and mud-water separation.

[0003] Traditional upstream and downstream treatment processes for fluorine-containing wastewater are scattered, irregular in shape, occupy a large area, have low treatment efficiency, and require a long sewage pipe network. Uneven water distribution in some sedimentation tanks results in a large amount of sewage flowing in instantly, exceeding the design load of the treatment facilities. In addition, in some flocculation tanks, the flocs produced after the reaction of chemicals and sewage accumulate sludge after entering the sedimentation tank, affecting the efficiency of subsequent process treatment. Summary of the invention

[0004] 1. Technical problem to be solved by the invention

[0005] In view of the defects and shortcomings of the prior art, the present invention provides a combined treatment tank for fluorine-containing wastewater and a process thereof. The present invention uses a combined treatment tank that integrates a homogenization tank, an online water inlet monitoring room, a high-efficiency inclined plate sedimentation unit and a sludge conditioning tank to treat fluorine-containing wastewater. A variety of special-shaped processes can be combined into a pool type with a relatively regular appearance, shortening the construction length of the sewage pipe network, improving the treatment efficiency, reducing the floor space, and reducing the construction and transportation costs. The water distribution tank in the sedimentation unit helps to balance the water intake of the treatment system, avoid exceeding the design load of the treatment facility due to the instantaneous influx of a large amount of sewage, homogenize the water quality of the fluorine-containing wastewater, make the water distribution more uniform, enable the subsequent treatment units to operate stably, and improve the treatment stability. The sludge discharge pipe connected to the flocculation tank can discharge a portion of the sludge in advance before the sedimentation tank, avoiding the problem of sludge blockage and improving the fluorine removal efficiency.

[0006] 2. Technical solution

[0007] In order to achieve the above object, the technical solution provided by the present invention is:

[0008] A combined fluorine-containing wastewater treatment tank of the present invention comprises a homogenizing tank, a high-efficiency inclined plate sedimentation unit, a sludge conditioning tank and an influent online monitoring room:

[0009] The homogenizing tank is provided with a submersible mixer, the bottom of the homogenizing tank is provided with a homogenizing tank water inlet pipe, the homogenizing tank is provided with a sump, and the sump is provided with a submersible sewage pump;

[0010] The high-efficiency inclined plate sedimentation unit comprises a water distribution tank, a mixing tank, a flocculation tank, a sedimentation area, a sludge area, a clear water area and a water outlet channel;

[0011] The bottom of the water distribution tank is connected to a water distribution tank inlet pipe, two rectangular water distribution weirs are symmetrically arranged in the water distribution tank, and a water distribution tank water hole is arranged at the output end of the water distribution tank. Sewage flows out from the two rectangular water distribution weirs on the left and right sides and enters the mixing tank through the water distribution tank water hole;

[0012] The water from the bottom of the mixing tank flows to the flocculation tank; a flocculation stirrer is provided in the flocculation tank, and a flocculation guide tube is provided in the flocculation tank; the water from the flocculation tank flows into the sedimentation area through the water hole of the flocculation tank;

[0013] The sedimentation zone adopts an upflow type heterogeneous flow inclined tube sedimentation tank, and an inclined tube is arranged in the middle of the tank body of the sedimentation zone;

[0014] A sludge area is provided at the bottom of the sedimentation area, and the output end of the sludge area is connected to the sludge conditioning tank;

[0015] A clean water area is arranged on the top of the sedimentation area, a water collecting tank assembly is arranged in the clean water area, and a water outlet channel is arranged at the output end of the clean water area.

[0016] Furthermore, the submersible mixers are provided in multiple groups and are respectively installed at the water inlet end and the middle of the homogenizing tank. The top of the homogenizing tank is provided with a stainless steel grille cover and an electric monorail crane. The stainless steel grille cover is correspondingly arranged above the submersible sewage pump.

[0017] Furthermore, the water inlet online monitoring room is arranged on the top of the homogenization tank, and a sampling pump is arranged on one side of the water inlet online monitoring room. The sampling pump takes samples from the homogenization tank and inputs them into the water inlet online monitoring room for monitoring.

[0018] Furthermore, a manual cast iron copper-inlaid square gate is provided at the input end of the water distribution tank water tunnel, and a channel gate is provided at the input end of the water outlet channel.

[0019] Furthermore, a mixing mixer is provided in the mixing tank, and the mixing mixer is provided with three layers of blades;

[0020] The mixing tank is externally connected to a defluorinating agent dosing pipe, and the defluorinating agent enters the mixing tank through the defluorinating agent dosing pipe;

[0021] The flocculation tank is externally connected to a dosing pipe, and the dosing pipe enters the flocculation tank.

[0022] Furthermore, an intermediate channel is provided between the flocculation tank and the sedimentation zone, and a mud discharge pipe is connected to the bottom of the intermediate channel.

[0023] Furthermore, the inclined tube has an inclination angle of 60 degrees, and the cross section of the inclined tube is in a hexagonal honeycomb shape.

[0024] Furthermore, a central transmission thickening scraper is provided in the sludge area, a sludge hopper is provided at the bottom of the sludge area, a return sludge pipe and a residual sludge pipe are connected to the sludge hopper, the return sludge pipe and the residual sludge pipe are vertically downward and then horizontally pass through the sludge hopper and merge into the sludge main pipe respectively, the output end of the sludge main pipe leads to a sludge conditioning tank, and a frame-type conditioning mixer is provided in the sludge conditioning tank.

[0025] Furthermore, a return sludge screw pump is provided on the pipeline of the return sludge pipe, and a surplus sludge screw pump is provided on the pipeline of the surplus sludge pipe.

[0026] A process for a combined treatment tank for fluorine-containing wastewater comprises the following steps: when the high-efficiency inclined plate sedimentation unit is working, sewage enters the water distribution tank from the water inlet pipe from bottom to top, is evenly distributed to the mixing tank through the rectangular water distribution weir, and the water flows out from the bottom of the mixing tank to the flocculation tank. The flocculation tank effluent enters the inclined pipe in the sedimentation area through the water hole of the flocculation tank. The sewage entering the inclined pipe flows downward. During this process, due to the effect of gravity, the solid particles in the water begin to settle downward to the sludge area. When the sludge layer reaches a certain thickness, the sludge is discharged through the return sludge pipe and the residual sludge pipe through the central transmission thickening scraper. The raw water enters the clear water area from bottom to top and is discharged out of the tank through the outlet channel.

[0027] 3. Beneficial effects

[0028] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0029] The present invention uses a combined treatment tank that integrates a homogenization tank, an online water inlet monitoring room, a high-efficiency inclined plate sedimentation unit and a sludge conditioning tank to treat fluoride-containing wastewater. It can combine a variety of special-shaped processes into a tank type with a relatively regular appearance, shorten the construction length of the sewage pipe network, improve the treatment efficiency, reduce the floor space, and reduce the construction and transportation costs. The water distribution tank in the sedimentation unit helps to balance the water intake of the treatment system, avoid exceeding the design load of the treatment facility due to the instantaneous influx of a large amount of sewage, homogenize the water quality of the fluoride-containing wastewater, make the water distribution more uniform, and enable the subsequent treatment units to operate stably, thereby improving the treatment stability. The sludge discharge pipe connected to the flocculation tank can discharge a portion of the sludge in advance before the sedimentation tank, avoiding the problem of sludge blockage and improving the fluoride removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an upper plan view of the present invention;

[0031] Figure 2 It is a middle plan view of the present invention;

[0032] Figure 3 is a bottom plan view of the present invention;

[0033] Figure 4 1-1 is a cross-sectional view of the present invention;

[0034] Figure 5 2-2 is a cross-sectional view of the present invention;

[0035] Figure 6 3-3 is a cross-sectional view of the present invention;

[0036] Figure 7 It is the cross-sectional view 4-4 of the present invention.

[0037] In the figure: A, homogenization tank; B, high-efficiency inclined plate sedimentation unit; D, inlet online monitoring room; E, sludge conditioning tank; a, distribution tank; b, mixing tank; c, flocculation tank; d, sedimentation area; e, sludge area; f, clean water area; g, outlet channel; 1, submersible mixer; 2, homogenization tank inlet pipe; 3, submersible sewage pump; 4, stainless steel grille cover; 5, electric monorail crane; 6, distribution tank inlet pipe; 7, rectangular distribution weir; 8, distribution tank water tunnel; 9, manual cast iron inlaid copper square gate door; 10. Mixing mixer; 11. Defluorinating agent dosing pipe; 12. Flocculation mixer; 13. PAM dosing pipe; 14. Flocculation guide tube; 15. Mud discharge pipe; 16. Inclined pipe; 17. Center-driven thickening scraper; 18. Return sludge pipe; 19. Residual sludge pipe; 20. Return sludge screw pump; 21. Residual sludge screw pump; 22. Sludge main pipe; 23. Water collecting tank assembly; 24. Channel gate; 25. Frame conditioning mixer; 26. Flocculation tank water tunnel. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0039] Example 1

[0040] from Figure 1-7 It can be seen that the combined treatment tank for fluorine-containing wastewater in this embodiment includes a homogenization tank A, a high-efficiency inclined plate sedimentation unit B, a sludge conditioning tank E and an influent online monitoring chamber D:

[0041] A submersible mixer 1 is provided in the homogenizing tank A, a homogenizing tank water inlet pipe 2 is provided at the bottom of the homogenizing tank A, a sump is provided in the homogenizing tank A, and a submersible sewage pump 3 is provided in the sump; in order to prevent the sedimentation of suspended matter in the sewage and make the water quality uniform, a submersible mixer 1 is used for stirring in the tank, and a plurality of submersible mixers 1 are provided, and are respectively installed at the water inlet end and the middle of the homogenizing tank A; a stainless steel grille cover plate 4 and an electric monorail crane 5 are provided at the top of the homogenizing tank A, and the stainless steel grille cover plate 4 is correspondingly arranged above the submersible sewage pump 3; it is convenient for the maintenance work of the submersible sewage pump 3;

[0042] The inlet water online monitoring room D is arranged on the top of the homogenizing tank A. A sampling pump is arranged on one side of the inlet water online monitoring room D. The sampling pump takes samples from the homogenizing tank A and inputs the samples into the inlet water online monitoring room D for monitoring.

[0043] Example 2

[0044] from Figure 1-7 It can be seen that in the combined treatment tank for fluorine-containing wastewater of this embodiment, the high-efficiency inclined plate sedimentation unit B includes a water distribution tank a, a mixing tank b, a flocculation tank c, a sedimentation area d, a sludge area e, a clear water area f and an outlet channel g;

[0045] The bottom of the water distribution tank a is connected to a water distribution tank inlet pipe 6, two rectangular water distribution weirs 7 are symmetrically arranged in the water distribution tank a, a water distribution tank water hole 8 is arranged at the output end of the water distribution tank a, and a manual cast iron copper-inlaid square gate 9 is arranged at the input end of the water distribution tank water hole 8. Sewage flows out from the two rectangular water distribution weirs 7 on the left and right sides and enters the mixing tank b through the water distribution tank water hole 8;

[0046] This water distribution method helps to balance the water intake of the treatment system, avoid exceeding the design load of the treatment facility due to the instantaneous influx of large amounts of sewage, homogenize the water quality of fluoride-containing wastewater, make water distribution more uniform, enable subsequent treatment units to operate stably, and improve treatment stability;

[0047] A mixing and stirring machine 10 is arranged in the mixing tank b, and the mixing and stirring machine 10 is provided with three layers of blades; a defluorination agent dosing pipe 11 is connected to the mixing tank b, and the defluorination agent enters the mixing tank b through the defluorination agent dosing pipe 11, and achieves the purpose of deep defluorination through the effects of strong adsorption and ion exchange;

[0048] The water from the bottom of the mixing tank b is discharged to the flocculation tank c; a flocculation stirrer 12 is provided in the flocculation tank c, and a flocculation guide tube 14 is provided in the flocculation tank c; the flocculation tank c is externally connected to a PAM dosing pipe 13, and the PAM enters the flocculation tank c through the PAM dosing pipe 13; the suspended particles in the water are aggregated and enlarged, or flocs are formed through the action of chemicals or mechanical action, thereby accelerating the coagulation of particles and achieving the purpose of solid-liquid separation; the water from the flocculation tank c enters the sedimentation area d through the water hole 26 of the flocculation tank;

[0049] An intermediate channel is provided between the flocculation tank c and the sedimentation zone d, and a sludge discharge pipe 15 is connected to the bottom of the intermediate channel; the sludge discharge pipe 15 can discharge a part of the sludge in advance before the sedimentation zone d, thereby avoiding the problem of sludge blockage and improving the defluorination efficiency;

[0050] The sedimentation zone d adopts an upflow type heterogeneous flow inclined tube sedimentation tank, and an inclined tube 16 is arranged in the middle of the tank body of the sedimentation zone d; the inclined angle of the inclined tube 16 is 60 degrees, and the cross section of the inclined tube 16 is a hexagonal honeycomb shape;

[0051] A sludge zone e is provided at the bottom of the sedimentation zone d, and the output end of the sludge zone e is connected to the sludge conditioning tank E;

[0052] A clean water zone f is arranged at the top of the sedimentation zone d, and a water collecting trough assembly 23 is arranged in the clean water zone f. The water collecting trough assembly 23 can ensure that the clean water is evenly distributed in the sedimentation zone d, avoiding the uneven phenomenon of water flow at the water outlet; a water outlet channel g is arranged at the output end of the clean water zone f, and a channel gate 24 is arranged at the input end of the water outlet channel g.

[0053] A central transmission thickening scraper 17 is arranged in the sludge area e, and a sludge hopper is arranged at the bottom of the sludge area e. A return sludge pipe 18 and a residual sludge pipe 19 are connected to the sludge hopper. The return sludge pipe 18 and the residual sludge pipe 19 are vertically downward and then horizontally pass through the sludge hopper and merge into the sludge main pipe 22 respectively. The output end of the sludge main pipe 22 leads to the sludge conditioning tank E. A return sludge screw pump 20 is arranged on the pipeline of the return sludge pipe 18, and a residual sludge screw pump 21 is arranged on the pipeline of the residual sludge pipe 19; a frame-type conditioning mixer 25 is arranged in the sludge conditioning tank E.

[0054] Example 3

[0055] from Figure 1-7 It can be seen that the process of a combined treatment tank for fluorine-containing wastewater in this embodiment comprises the following steps: when the high-efficiency inclined plate sedimentation unit is working, sewage enters the water distribution tank a from the bottom to the top through the water distribution tank inlet pipe 6, and is evenly distributed to the mixing tank b through the rectangular water distribution weir 7. Water flows out from the bottom of the mixing tank b to the flocculation tank c. The effluent from the flocculation tank c enters the inclined pipe 16 in the sedimentation area d through the water hole 26 of the flocculation tank. The sewage entering the inclined pipe 16 flows downward. During this process, due to the action of gravity, the solid particles in the water begin to settle downward to the sludge area e. When the sludge layer reaches a certain thickness, the sludge is discharged through the return sludge pipe 18 and the residual sludge pipe 19 through the central transmission thickening scraper 17. The raw water enters the clear water area f from the bottom to the top and is discharged out of the pool through the outlet channel g.

[0056] The present invention uses a combined treatment tank that integrates a homogenization tank, an online water inlet monitoring room, a high-efficiency inclined plate sedimentation unit and a sludge conditioning tank to treat fluoride-containing wastewater. It can combine a variety of special-shaped processes into a tank type with a relatively regular appearance, shorten the construction length of the sewage pipe network, improve the treatment efficiency, reduce the floor space, and reduce the construction and transportation costs. The water distribution tank in the sedimentation unit helps to balance the water intake of the treatment system, avoid exceeding the design load of the treatment facility due to the instantaneous influx of a large amount of sewage, homogenize the water quality of the fluoride-containing wastewater, make the water distribution more uniform, and enable the subsequent treatment units to operate stably, thereby improving the treatment stability. The sludge discharge pipe connected to the flocculation tank can discharge a portion of the sludge in advance before the sedimentation tank, avoiding the problem of sludge blockage and improving the fluoride removal efficiency.

[0057] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A combined treatment tank for fluorine-containing wastewater, comprising a homogenizing tank (A), a high-efficiency inclined plate sedimentation unit (B), a sludge conditioning tank (E) and an influent online monitoring chamber (D), characterized in that: The homogenizing tank (A) is provided with a submersible mixer (1), the bottom of the homogenizing tank (A) is provided with a homogenizing tank water inlet pipe (2), the homogenizing tank (A) is provided with a sump, and the sump is provided with a submersible sewage pump (3); The high-efficiency inclined plate sedimentation unit (B) comprises a water distribution tank (a), a mixing tank (b), a flocculation tank (c), a sedimentation area (d), a sludge area (e), a clear water area (f) and an outlet channel (g); The bottom of the water distribution tank (a) is connected to a water distribution tank water inlet pipe (6), two rectangular water distribution weirs (7) are symmetrically arranged in the water distribution tank (a), and a water distribution tank water passage hole (8) is arranged at the output end of the water distribution tank (a), and sewage flows out from the two rectangular water distribution weirs (7) on the left and right sides and enters the mixing tank (b) through the water distribution tank water passage hole (8); The water from the bottom of the mixing tank (b) flows into the flocculation tank (c); a flocculation stirrer (12) is arranged in the flocculation tank (c), and a flocculation guide tube (14) is arranged in the flocculation tank (c); the water from the flocculation tank (c) flows into the sedimentation area (d) through the flocculation tank water hole (26); The sedimentation zone (d) adopts an upflow type countercurrent inclined tube sedimentation tank, and an inclined tube (16) is arranged in the middle of the tank body of the sedimentation zone (d); A sludge zone (e) is provided at the bottom of the sedimentation zone (d), and an output end of the sludge zone (e) is connected to a sludge conditioning tank (E); A clean water zone (f) is arranged on the top of the sedimentation zone (d), a water collecting trough assembly (23) is arranged in the clean water zone (f), and a water outlet channel (g) is arranged at the output end of the clean water zone (f).

2. A combined fluorine-containing wastewater treatment pool according to claim 1, characterized in that: The submersible mixer (1) is provided with a plurality of groups and is respectively installed at the water inlet end and the middle of the homogenizing tank (A). A stainless steel grille cover plate (4) and an electric monorail crane (5) are provided on the top of the homogenizing tank (A). The stainless steel grille cover plate (4) is correspondingly arranged above the submersible sewage pump (3).

3. A combined fluorine-containing wastewater treatment pool according to claim 1, characterized in that: The water inlet online monitoring room (D) is arranged on the top of the homogenizing tank (A), and a sampling pump is arranged on one side of the water inlet online monitoring room (D). The sampling pump takes samples from the homogenizing tank (A) and inputs them into the water inlet online monitoring room (D) for monitoring.

4. A combined fluorine-containing wastewater treatment pool according to claim 1, characterized in that: The input end of the water distribution tank water passage (8) is provided with a manual cast iron copper-inlaid square gate (9), and the input end of the water outlet channel (g) is provided with a channel gate (24).

5. The combined fluorine-containing wastewater treatment pool according to claim 1, characterized in that: The mixing tank (b) is provided with a mixing stirrer (10), and the mixing stirrer (10) is provided with three layers of blades; The mixing tank (b) is externally connected to a defluorinating agent dosing pipe (11), and the defluorinating agent enters the mixing tank (b) through the defluorinating agent dosing pipe (11); The flocculation tank (c) is externally connected to a PAM dosing pipe (13), and PAM enters the flocculation tank (c) through the PAM dosing pipe (13).

6. A combined fluorine-containing wastewater treatment pool according to claim 1, characterized in that: An intermediate channel is provided between the flocculation tank (c) and the sedimentation zone (d), and a mud discharge pipe (15) is connected to the bottom of the intermediate channel.

7. A combined fluorine-containing wastewater treatment pool according to claim 1, characterized in that: The inclined tube (16) has an inclination angle of 60 degrees, and the cross section of the inclined tube (16) is in a hexagonal honeycomb shape.

8. The combined fluorine-containing wastewater treatment pool according to claim 1, characterized in that: The sludge zone (e) is provided with a central transmission thickening scraper (17), and a sludge hopper is provided at the bottom of the sludge zone (e). A return sludge pipe (18) and a residual sludge pipe (19) are connected to the sludge hopper. The return sludge pipe (18) and the residual sludge pipe (19) are vertically downward and then horizontally pass through the sludge hopper and merge into the sludge main pipe (22) respectively. The output end of the sludge main pipe (22) leads to a sludge conditioning tank (E), and a frame conditioning mixer (25) is provided in the sludge conditioning tank (E).

9. A combined fluorine-containing wastewater treatment pool according to claim 8, characterized in that: The return sludge pipe (18) is provided with a return sludge screw pump (20), and the excess sludge pipe (19) is provided with an excess sludge screw pump (21).

10. The process of a combined fluorine-containing wastewater treatment tank according to claim 9, characterized in that: The steps are as follows: when the high-efficiency inclined plate sedimentation unit (B) is working, sewage enters the water distribution tank (a) from the water inlet pipe (6) of the water distribution tank from bottom to top, and is evenly distributed to the mixing tank (b) through the rectangular water distribution weir (7). Water flows out of the bottom of the mixing tank (b) to the flocculation tank (c). The flocculation tank (c) flows into the inclined pipe (16) in the sedimentation area (d) through the flocculation tank water hole (26). The sewage entering the inclined pipe (16) flows downward. In this process, due to the effect of gravity, solid particles in the water begin to settle downward to the sludge area (e). When the sludge layer reaches a certain thickness, the sludge is discharged through the return sludge pipe (18) and the residual sludge pipe (19) through the central transmission thickening scraper (17). The raw water enters the clear water area (f) from bottom to top and is discharged out of the tank through the outlet channel (g).

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