Combined treatment tank for fluorine-containing wastewater

Abstract

The utility model discloses a combined treatment tank for fluorine-containing wastewater, 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 type treatment tank integrating the homogenizing tank, the water inlet online monitoring chamber, the efficient inclined plate sedimentation unit and the sludge conditioning tank is used for treating fluorine-containing wastewater, and various special-shaped processes can be spliced into a tank type with a relatively regular appearance, so that 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] This utility model relates to the field of fluoride-containing wastewater treatment technology, and more specifically, to a combined treatment tank for fluoride-containing wastewater. Background Technology

[0002] In modern industrial production processes such as chemical, steel, cement, glass, and metallurgy, naturally occurring fluorine-containing minerals are used as primary or auxiliary raw materials. Especially in the production of solar panels, fluoropolymer backsheets are widely used in the manufacture of photovoltaic modules in China. While this material improves the durability and performance of the modules, it is difficult to recycle and dispose of after disposal, potentially leading to environmental pollution. Fluorine-containing wastewater is characterized by large volumes, wide distribution, and significant variations in fluoride concentration. Different methods of defluorination are required for wastewater of varying concentrations. Fluorine-containing wastewater often contains inorganic acids, alkalis, and salts, further complicating treatment. To protect environmental health and safety and meet national standards for fluorine-containing wastewater discharge, defluorination treatment is necessary before discharge. Treatment methods for fluorine-containing wastewater include precipitation, adsorption, ion exchange, electrochemical methods, electrodialysis, liquid membrane methods, and reverse osmosis. Adsorption precipitation is a method that removes fluoride from wastewater by adding substances with coagulation capabilities or those that can chemically react with fluoride ions. This causes the fluoride in the wastewater to react with these substances to form a large number of colloids and insoluble substances, which are then removed through sedimentation and mud-water separation.

[0003] Traditional fluoride wastewater treatment processes are fragmented, irregularly shaped, require large land areas, have low treatment efficiency, and necessitate long sewage pipelines. Uneven water distribution in some sedimentation tanks can cause a sudden influx of large amounts of wastewater, exceeding the design capacity of the treatment facilities. Furthermore, in some flocculation tanks, the flocs produced after the reaction of chemicals and wastewater accumulate as sludge after entering the sedimentation tank, affecting the efficiency of subsequent treatment processes. Utility Model Content

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

[0005] To address the shortcomings and deficiencies of existing technologies, this invention provides a combined treatment tank for fluoride-containing wastewater. This invention integrates a homogenization tank, an online influent monitoring chamber, a high-efficiency inclined plate sedimentation unit, and a sludge conditioning tank into a single, more uniform tank design. This allows for the combination of various irregular processes into a more regular-looking tank shape, shortening the length of sewage pipelines, improving treatment efficiency, reducing land area, and lowering construction and transportation costs. The water distribution tank in the sedimentation unit helps balance the influent flow of the treatment system, preventing the design load of the treatment facility from being exceeded due to a sudden influx of large amounts of wastewater. It also homogenizes the quality of the fluoride-containing wastewater, resulting in more uniform water distribution and stable operation of subsequent treatment units, thus improving treatment stability. The sludge discharge pipe connected to the flocculation tank can discharge a portion of the sludge before the sedimentation tank, avoiding sludge blockage and improving defluorination efficiency.

[0006] 2. Technical Solution

[0007] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0008] This utility model discloses a combined treatment tank for fluoride-containing wastewater, comprising a homogenization tank, a high-efficiency inclined plate sedimentation unit, a sludge conditioning tank, and an influent online monitoring room.

[0009] The homogenizing tank is equipped with a submersible mixer, a homogenizing tank inlet pipe is installed at the bottom of the homogenizing tank, a water collection pit is installed in the homogenizing tank, and a submersible sewage pump is installed in the water collection pit.

[0010] The high-efficiency inclined plate sedimentation unit includes a water distribution tank, a mixing tank, a flocculation tank, a sedimentation zone, a sludge zone, a clear water zone, and an effluent channel;

[0011] The bottom of the water distribution tank is connected to the water distribution tank inlet pipe. Two rectangular water distribution weirs are symmetrically arranged inside the water distribution tank. The output end of the water distribution tank is provided with a water distribution tank through hole. 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 through hole.

[0012] The water from the bottom of the mixing tank flows into the flocculation tank; the flocculation tank is equipped with a flocculation mixer and a flocculation guide tube; the water from the flocculation tank flows into the sedimentation zone through the flocculation tank water passage.

[0013] The sedimentation zone is an upflow counter-current inclined tube sedimentation tank, and an inclined tube is installed in the middle of the sedimentation zone.

[0014] The bottom of the sedimentation zone is provided with a sludge zone, and the output end of the sludge zone is connected to the sludge conditioning tank.

[0015] The sedimentation zone is topped with a clear water zone, which contains a water collection tank assembly. The output end of the clear water zone is provided with a water outlet channel.

[0016] Furthermore, the submersible mixer is provided in multiple sets and is installed at the inlet and middle of the homogenization tank respectively. The top of the homogenization tank is provided with a stainless steel grating cover and an electric monorail crane. The stainless steel grating cover is correspondingly positioned above the submersible sewage pump.

[0017] Furthermore, the influent online monitoring chamber is located on top of the homogenization tank, and a sampling pump is installed on one side of the influent online monitoring chamber. The sampling pump takes samples from the homogenization tank and inputs them into the influent online monitoring chamber for monitoring.

[0018] Furthermore, the water distribution pool's inlet is equipped with a manually operated cast iron square gate inlaid with copper, and the outlet channel's inlet is equipped with a channel gate.

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

[0020] The mixing tank is connected to an external defluorinating agent dosing pipe, through which the defluorinating agent enters the mixing tank;

[0021] The flocculation tank is connected to an external dosing pipe, through which chemicals enter the flocculation tank.

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

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

[0024] Furthermore, a centrally driven thickening and scraping sludge machine is installed in the sludge zone, and a sludge hopper is installed at the bottom of the sludge zone. A return sludge pipe and a residual sludge pipe are connected inside the sludge hopper. The outlets of the return sludge pipe and the residual sludge pipe are vertically downward and then horizontally pass through the sludge hopper and flow into the sludge main pipe respectively. The output end of the sludge main pipe leads to the sludge conditioning tank, and a frame-type conditioning mixer is installed in the sludge conditioning tank.

[0025] Furthermore, a return sludge screw pump is installed on the return sludge pipe, and a residual sludge screw pump is installed on the residual sludge pipe.

[0026] A process for a combined treatment tank for fluoride-containing wastewater includes the following steps: When the high-efficiency inclined plate sedimentation unit is in operation, wastewater enters the distribution tank from bottom to top through the inlet pipe. It is then evenly distributed to the mixing tank through a rectangular distribution weir. The water from the bottom of the mixing tank flows into the flocculation tank. The effluent from the flocculation tank enters the inclined tube in the sedimentation zone through the water passage of the flocculation tank. The wastewater flowing into the inclined tube flows downward. During this process, due to gravity, solid particles in the water begin to settle downward into the sludge zone. When the sludge layer reaches a certain thickness, the sludge is discharged through the return sludge pipe and the remaining sludge pipe by the centrally driven thickening scraper. The raw water enters the clear water zone from bottom to top and is discharged outside the tank through the effluent channel.

[0027] 3. Beneficial effects

[0028] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0029] This invention employs a combined treatment tank integrating a homogenization tank, an online influent monitoring chamber, a high-efficiency inclined plate sedimentation unit, and a sludge conditioning tank to treat fluoride-containing wastewater. It combines various irregularly shaped processes into a more uniform tank design, shortening the length of sewage pipelines, improving treatment efficiency, reducing land area, and lowering construction and transportation costs. The distribution tank in the sedimentation unit helps balance the influent flow of the treatment system, preventing the design load of the treatment facility from being exceeded due to a sudden influx of large amounts of wastewater. It also homogenizes the fluoride-containing wastewater quality, resulting in more uniform water distribution and stable operation of subsequent treatment units, thus improving treatment stability. The sludge discharge pipe connected to the flocculation tank can discharge a portion of the sludge before the sedimentation tank, avoiding sludge blockage and improving defluorination efficiency. Attached Figure Description

[0030] Figure 1 This is a top plan view of the present invention;

[0031] Figure 2 This is a plan view of the middle section of this utility model;

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

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

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

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

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

[0037] In the diagram: A. Equalization tank; B. High-efficiency inclined plate sedimentation unit; D. Influent online monitoring room; E. Sludge conditioning tank; a. Distribution tank; b. Mixing tank; c. Flocculation tank; d. Sedimentation zone; e. Sludge zone; f. Clear water zone; g. Effluent channel; 1. Submersible mixer; 2. Equalization tank inlet pipe; 3. Submersible sewage pump; 4. Stainless steel grating cover; 5. Electric monorail crane; 6. Distribution tank inlet pipe; 7. Rectangular distribution weir; 8. Distribution tank overflow tunnel; 9. Manual cast iron copper-inlaid square gate. 10. Mixing mixer; 11. Defluoridant dosing pipe; 12. Flocculation mixer; 13. PAM dosing pipe; 14. Flocculation guide tube; 15. Sludge discharge pipe; 16. Inclined pipe; 17. Center-driven thickening scraper; 18. Return sludge pipe; 19. Excess sludge pipe; 20. Return sludge screw pump; 21. Excess sludge screw pump; 22. Sludge main pipe; 23. Water collection tank assembly; 24. Channel gate; 25. Frame-type conditioning mixer; 26. Flocculation tank water passage. Detailed Implementation

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

[0039] Example 1

[0040] from Figure 1-7 As can be seen, the combined treatment tank for fluoride-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 installed inside homogenizing tank A. A homogenizing tank inlet pipe 2 is installed at the bottom of homogenizing tank A. A sump is installed inside homogenizing tank A, and a submersible sewage pump 3 is installed in the sump. To prevent the sedimentation of suspended solids in the sewage and to make the water quality uniform, the submersible mixer 1 is used for mixing in the tank. There are multiple sets of submersible mixer 1, which are installed at the inlet end and the middle of homogenizing tank A respectively. A stainless steel grating cover 4 and an electric monorail crane 5 are installed on the top of homogenizing tank A. The stainless steel grating cover 4 is positioned above the submersible sewage pump 3 to facilitate the maintenance of the submersible sewage pump 3.

[0042] The influent online monitoring chamber D is located on top of the homogenization tank A. A sampling pump is installed on one side of the influent online monitoring chamber D. The sampling pump takes samples from the homogenization tank A and inputs them into the influent online monitoring chamber D for monitoring.

[0043] Example 2

[0044] from Figure 1-7 As can be seen, the combined treatment tank for fluoride-containing wastewater in this embodiment includes a high-efficiency inclined plate sedimentation unit B, which comprises a water distribution tank a, a mixing tank b, a flocculation tank c, a sedimentation zone d, a sludge zone e, a clear water zone f, and an effluent channel g.

[0045] The bottom of the water distribution tank a is connected to the water distribution tank inlet pipe 6. Two rectangular water distribution weirs 7 are symmetrically arranged inside the water distribution tank a. The output end of the water distribution tank a is provided with a water distribution tank through hole 8. The input end of the water distribution tank through hole 8 is provided with a manual cast iron copper-inlaid square gate 9. 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 through hole 8.

[0046] This water distribution method helps to balance the inflow of the treatment system, avoid exceeding the design load of the treatment facility due to a sudden surge of large amounts of sewage, homogenize the water quality of fluoride-containing wastewater, make the water distribution more uniform, and enable subsequent treatment units to operate stably, thereby improving treatment stability.

[0047] A mixing mixer 10 is installed inside the mixing tank b, and the mixing mixer 10 has three layers of blades; the mixing tank b is connected to a defluorinating agent dosing pipe 11, and the defluorinating agent enters the mixing tank b through the defluorinating agent dosing pipe 11, and achieves the purpose of deep defluorination through strong adsorption and ion exchange.

[0048] Water from the bottom of mixing tank b flows into flocculation tank c; flocculation tank c is equipped with a flocculation mixer 12 and a flocculation guide tube 14; PAM dosing pipe 13 is connected to the outside of flocculation tank c, and PAM enters flocculation tank c through PAM dosing pipe 13; through chemical or mechanical action, suspended particles in the water are agglomerated and enlarged, or flocs are formed, thereby accelerating particle sedimentation and achieving solid-liquid separation; water from flocculation tank c enters sedimentation zone d through flocculation tank through-hole 26.

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

[0050] The sedimentation zone d adopts an upflow countercurrent inclined tube sedimentation tank, and an inclined tube 16 is set in the middle of the sedimentation zone d; the inclined tube 16 has an inclination angle of 60 degrees and a hexagonal honeycomb cross-section.

[0051] A sludge zone e is located 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 clear water zone f is provided at the top of the sedimentation zone d. A water collection tank assembly 23 is provided in the clear water zone f. The water collection tank assembly 23 can ensure that the clear water is evenly distributed in the sedimentation zone d and avoid the uneven flow of water at the outlet. A water outlet channel g is provided at the output end of the clear water zone f. A channel gate 24 is provided at the input end of the water outlet channel g.

[0053] A center-driven thickening scraper 17 is installed in sludge zone e. A sludge hopper is installed at the bottom of sludge zone e. A return sludge pipe 18 and a residual sludge pipe 19 are connected in the sludge hopper. The outlets of the return sludge pipe 18 and the residual sludge pipe 19 are vertically downward and then horizontally pass through the sludge hopper and flow 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 installed on the return sludge pipe 18, and a residual sludge screw pump 21 is installed on the residual sludge pipe 19. A frame-type conditioning mixer 25 is installed in the sludge conditioning tank E.

[0054] Example 3

[0055] from Figure 1-7 As can be seen, the process of a combined treatment tank for fluoride-containing wastewater in this embodiment includes the following steps: When the high-efficiency inclined plate sedimentation unit is working, the wastewater enters the distribution tank a from bottom to top through the inlet pipe 6 of the distribution tank, and is evenly distributed to the mixing tank b through the rectangular distribution weir 7. The water from the bottom of the mixing tank b flows into the flocculation tank c. The water from the flocculation tank c flows into the inclined tube 16 in the sedimentation zone d through the water passage 26 of the flocculation tank. The wastewater entering the inclined tube 16 flows downward. During this process, due to gravity, the solid particles in the water begin to settle downward into the sludge zone e. When the sludge layer reaches a certain thickness, the sludge is discharged through the return sludge pipe 18 and the remaining sludge pipe 19 by the central drive thickening scraper 17. The raw water enters the clear water zone f from bottom to top and is discharged out of the tank through the outlet channel g.

[0056] This invention employs a combined treatment tank integrating a homogenization tank, an online influent monitoring chamber, a high-efficiency inclined plate sedimentation unit, and a sludge conditioning tank to treat fluoride-containing wastewater. It combines various irregularly shaped processes into a more uniform tank design, shortening the length of sewage pipelines, improving treatment efficiency, reducing land area, and lowering construction and transportation costs. The distribution tank in the sedimentation unit helps balance the influent flow of the treatment system, preventing the design load of the treatment facility from being exceeded due to a sudden influx of large amounts of wastewater. It also homogenizes the fluoride-containing wastewater quality, resulting in more uniform water distribution and stable operation of subsequent treatment units, thus improving treatment stability. The sludge discharge pipe connected to the flocculation tank can discharge a portion of the sludge before the sedimentation tank, avoiding sludge blockage and improving defluorination efficiency.

[0057] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A combined treatment tank for fluoride-containing wastewater, comprising a homogenization 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 equipped with a submersible mixer (1), the bottom of the homogenizing tank (A) is equipped with a homogenizing tank inlet pipe (2), the homogenizing tank (A) is equipped with a water collection pit, and the water collection pit is equipped with a submersible sewage pump (3). The high-efficiency inclined plate sedimentation unit (B) includes a water distribution tank (a), a mixing tank (b), a flocculation tank (c), a sedimentation zone (d), a sludge zone (e), a clear water zone (f), and an effluent channel (g). The bottom of the water distribution tank (a) is connected to the water distribution tank inlet pipe (6). Two rectangular water distribution weirs (7) are symmetrically arranged inside the water distribution tank (a). The output end of the water distribution tank (a) is provided with a water distribution tank through 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 through hole (8). The water from the bottom of the mixing tank (b) flows into the flocculation tank (c); the flocculation tank (c) is equipped with a flocculation mixer (12) and a flocculation guide tube (14); the water from the flocculation tank (c) flows into the sedimentation zone (d) through the flocculation tank water passage (26). The sedimentation zone (d) is an upflow countercurrent inclined tube sedimentation tank, and an inclined tube (16) is provided in the middle of the sedimentation zone (d). The bottom of the sedimentation zone (d) is provided with a sludge zone (e), and the output end of the sludge zone (e) is connected to the sludge conditioning tank (E). The sedimentation zone (d) is provided with a clear water zone (f) at the top, and a water collection tank assembly (23) is provided in the clear water zone (f). The output end of the clear water zone (f) is provided with a water outlet channel (g).

2. A combined treatment tank for fluorine-containing waste water according to claim 1, characterized in that: The submersible mixer (1) is provided in multiple sets and is installed at the water inlet and middle of the homogenizing tank (A). The top of the homogenizing tank (A) is provided with a stainless steel grating cover (4) and an electric monorail crane (5). The stainless steel grating cover (4) is correspondingly positioned above the submersible sewage pump (3).

3. A combined treatment tank for fluorine-containing waste water according to claim 1, characterized in that: The influent online monitoring chamber (D) is located on top of the homogenization tank (A). A sampling pump is installed on one side of the influent online monitoring chamber (D). The sampling pump takes samples from the homogenization tank (A) and inputs them into the influent online monitoring chamber (D) for monitoring.

4. A combined treatment tank for fluorine-containing waste water according to claim 1, characterized in that: The water distribution pool's water passage (8) is equipped with a manually operated cast iron copper-lined square gate (9) at its input end, and the water outlet channel (g) is equipped with a channel gate (24) at its input end.

5. A combined treatment tank for fluorine-containing waste water according to claim 1, characterized in that: The mixing tank (b) is equipped with a mixing agitator (10), which has three layers of blades; The mixing tank (b) is externally connected to a defluorinating agent dosing pipe (11), through which the defluorinating agent enters the mixing tank (b); The flocculation tank (c) is connected to a PAM dosing pipe (13), through which PAM enters the flocculation tank (c).

6. A combined treatment tank for fluorine-containing waste water according to claim 1, characterized in that: 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.

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

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

9. A combined treatment tank for fluoride-containing wastewater according to claim 8, characterized in that: The return sludge pipe (18) is equipped with a return sludge screw pump (20), and the residual sludge pipe (19) is equipped with a residual sludge screw pump (21).

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