Integrated fluorine removal device

Abstract

The application discloses an integrated fluorine removal device, which is provided with a water inlet area, a quicklime reaction area, a porcelain sand adsorption area and a water outlet area; the water inlet area is located at the bottom of the device, the quicklime reaction area is located at the middle lower part of the device, the porcelain sand adsorption area is located at the middle upper part of the device, and the water outlet area is located at the top of the device. The device is externally provided with a water inlet pipe, fluorine-containing wastewater is pumped into the water inlet area through a water inlet pump. A water distribution pipe is fixedly arranged in the water inlet area, and a support plate I is arranged between the water inlet area and the quicklime reaction area. A support plate II is arranged between the quicklime reaction area and the porcelain sand adsorption area. The integrated fluorine removal device adopts a tower structure, combines chemical precipitation method and adsorption method, is compact in structure, ensures that the fluorine ion content of the outlet water meets the standard, simplifies the fluorine ion removal process, reduces the land occupation area of the fluorine removal process, reduces the work risk of workers, reduces the engineering investment cost, is an environment-friendly integrated fluorine removal device, and has remarkable economic and environmental benefits.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment, specifically relating to an integrated defluorination device. Background Technology

[0002] Fluorine is an essential trace element for the human body. In nature, fluorine is usually found in minerals, but it dissolves when exposed to rainwater, causing fluoride pollution in surface and groundwater. On the other hand, aluminum and iron production, metal surface treatment, electroplating, glass and semiconductor manufacturing, mineral processing, and fertilization all contribute to fluoride pollution in water bodies. Appropriate fluoride intake in daily life is beneficial to health. Drinking water with a fluoride ion concentration between 0.5 and 1 mg / L can effectively prevent tooth decay. However, long-term consumption of water with a fluoride ion concentration higher than 1 mg / L can cause dental fluorosis, and long-term consumption of water with a fluoride ion concentration of 3 to 6 mg / L can cause skeletal fluorosis.

[0003] Therefore, the amount of fluoride ions ingested by the human body from food and drinking water must be controlled within a certain concentration range. The World Health Organization (WHO) stipulates that the concentration of fluoride in drinking water should be below 1.5 mg / L (WHO, 2004).

[0004] Currently, fluoride ion removal is mainly achieved through precipitation, adsorption, ion exchange, electrochemical methods, and membrane separation. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an integrated defluoridation device. This invention adopts a tower structure, combining chemical precipitation defluoridation with adsorption defluoridation, which improves the efficiency of fluoride ion removal, simplifies the fluoride ion removal process, ensures that the effluent fluoride ion meets the standards, reduces the work risks for staff, and lowers the project investment cost.

[0006] To achieve the above objectives, the specific technical solution adopted by the present invention is as follows:

[0007] An integrated defluoridation device includes an inlet water zone, a quicklime reaction zone, a ceramic sand adsorption zone, and an outlet water zone; the inlet water zone is located at the bottom of the device, the quicklime reaction zone is located in the lower middle part of the device, the ceramic sand adsorption zone is located in the upper middle part of the device, and the outlet water zone is located at the top of the device.

[0008] The device is equipped with an inlet pipe, through which fluoride-containing wastewater is pumped into the inlet area via an inlet pump.

[0009] A water distribution pipe is fixedly installed in the water inlet area, and a support plate I is installed between the water inlet area and the quicklime reaction area.

[0010] The quicklime reaction zone is fixedly equipped with a quicklime layer, a quicklime buffer layer, a quicklime feed pipe, a quicklime discharge pipe, a stop valve I, and a stop valve II. A support plate II is provided between the quicklime reaction zone and the ceramic sand adsorption zone.

[0011] The rare earth porcelain sand particles, the porcelain sand buffer layer, the porcelain sand particle feeding pipe, the porcelain sand particle discharging pipe, the stop valve III and the stop valve IV are fixedly arranged in the porcelain sand adsorption area, and the support plate III is arranged between the porcelain sand adsorption area and the water outlet area.

[0012] The overflow tank, the filter head and the water outlet pipe are fixedly arranged in the water outlet area.

[0013] The linear velocity of water flow of the device is 0.5-1 m / h, and the contact time is 30-60 min.

[0014] The inner diameter of the device is 0.1-0.5 m, the height is 0.5-1.5 m, and the diameter-height ratio is 1:6-1:8.

[0015] The concentration of fluorine ions in the water inlet is required to be in the range of 300-1200 mg / L.

[0016] The water distribution pipe adopts a pipe type water distributor, and the raw water is introduced from one side of the horizontal main pipe and is distributed to the filler layer through the small holes on the branch pipe.

[0017] The water distribution pipe branch pipe is usually provided with 3-8 branches, and the hole diameter of the small holes on the branch pipe is generally 3-5 mm, and is not less than 2 mm.

[0018] The water distribution pipe network is arranged at a distance of at least 80-120 mm from the support plate I.

[0019] In the quicklime reaction area, the effective calcium content of the quicklime is 60%-90%, and the total amount of the quicklime is determined according to the calcium-fluorine molar ratio of 0.8-1.1.

[0020] In the quicklime reaction area, the quicklime layer adopts a combination of small quicklime blocks and quicklime particles, the average particle size of the small quicklime blocks is controlled to be 2-5 cm, and the average particle size of the quicklime particles is controlled to be 0.3-0.8 cm.

[0021] In the quicklime reaction area, the height ratio of the quicklime buffer layer to the quicklime layer is 1:3-1:5, and the height ratio of the quicklime layer to the device is 1:2-1:2.5.

[0022] In the quicklime reaction area, the quicklime feeding pipe is arranged at a position 150-300 mm above the quicklime layer, and the quicklime discharging pipe is arranged at a position 150-300 mm above the support plate I.

[0023] In the porcelain sand adsorption area, the porcelain sand is a spherical ceramic particle made of Lushan soil, zeolite powder, starch and FeSO4·7H2O uniformly mixed and then dried, and the diameter of the spherical ceramic particle is about 2-4 mm, and the pore size distribution is in the range of less than 6 nm and 20-80 nm.

[0024] In the porcelain sand adsorption area, the height ratio of the porcelain sand buffer layer to the rare earth porcelain sand particles is 1:2-1:4, and the height ratio of the rare earth porcelain sand particles to the device is 1:5-1:7.

[0025] In the porcelain sand adsorption area, the porcelain sand particle feeding pipe is located at a position 150-300 mm above the rare earth porcelain sand particles, and the porcelain sand particle discharging pipe is located at a position 150-300 mm above the support plate II.

[0026] The support plates I, II and III all adopt a porous plate structure, and the minimum pore diameter is 0.1-0.5 mm.

[0027] In the water outlet area, the height of the water outlet layer is 150-300 mm, accounting for 10%-20% of the total device height.

[0028] In the water outlet area, the height of the overflow tank is set to 50-100 mm, and the overflow tank is arranged around the device with a width of 50-100 mm and a width-height ratio of 1.0-2.0.

[0029] In the water outlet area, the size of the filter head is matched with the water outlet pipe, and the gap is 0.1-0.5 mm.

[0030] Compared with the prior art, the present application has the following beneficial effects:

[0031] The integrated fluorine removal device is provided with a water inlet area, a quicklime reaction area, a porcelain sand adsorption area and a water outlet area. The water inlet area is located at the bottom of the device, the quicklime reaction area is located at the middle lower part of the device, the porcelain sand adsorption area is located at the middle upper part of the device, and the water outlet area is located at the top of the device. A water inlet pipe is arranged outside the device, and the fluorine-containing wastewater is pumped into the water inlet area through the water inlet pump. A water distribution pipe is fixedly arranged in the water inlet area, and a support plate I is arranged between the water inlet area and the quicklime reaction area. A quicklime layer, a quicklime buffer layer, a quicklime feeding pipe, a quicklime discharging pipe, a stop valve I and a stop valve II are fixedly arranged in the quicklime reaction area, and a support plate II is arranged between the quicklime reaction area and the porcelain sand adsorption area. Rare earth porcelain sand particles, a porcelain sand buffer layer, a porcelain sand particle feeding pipe, a porcelain sand particle discharging pipe, a stop valve III and a stop valve IV are fixedly arranged in the porcelain sand adsorption area, and a support plate III is arranged between the porcelain sand adsorption area and the water outlet area. An overflow tank, a filter head and a water outlet pipe are fixedly arranged in the water outlet area. The water flow line speed of the device is 0.5-1 m / h, and the contact time is 30-60 min, so that the fluorine ions in the wastewater can fully contact and react with the filler to meet the water outlet standard. The device is mainly used for treating low-flow high-concentration fluorine-containing wastewater. The diameter of the device is 0.1-0.5 m, the height of the device is 0.5-1.5 m, the diameter-height ratio is 1:6-1:8, and the device can treat wastewater with a fluorine ion concentration of 300-1200 mg / L. In order to uniformly distribute water, the water distribution pipe adopts a pipe type water distributor. The raw water is introduced from one side of the horizontal main pipe, and is distributed to the filler layer through the small holes on the branch pipes. Usually, 3-8 branch pipes are arranged on the water distribution pipe, and the diameter of the small holes on the branch pipes is generally 3-5 mm, and the diameter of the small holes on the branch pipes should not be less than 2 mm. The water distribution pipe network is arranged at a distance of at least 80-120 mm from the support plate I to ensure the stability of the continuous operation of the water distribution device. The filler in the device is required to be arranged in different areas and cannot be mixed. The support plate I adopts a porous plate structure, and the minimum hole diameter is 0.1-0.5 mm to achieve the purpose of filler zoning. In the quicklime reaction area, the effective calcium content of the lime is 60%-90%, the total amount of quicklime is determined according to the calcium-fluorine molar ratio of 0.8-1.1, the drug dosage meets the calcium fluoride precipitation mechanism, and the fluorine ion removal rate can reach 98%. In order to improve the durability of the filler, the quicklime layer adopts a combination of small quicklime blocks and quicklime particles. The average particle diameter of the small quicklime blocks is controlled to be 2-5 cm, and the average particle diameter of the quicklime particles is controlled to be 0.3-0.8 cm. In order to ensure the stability of the water pressure in the device, a buffer layer is arranged in the area to ensure the normal operation of the device. The height ratio of the quicklime buffer layer to the quicklime layer is 1:3-1:5, and the height ratio of the quicklime layer to the device is 1:2-1:2.5. The quicklime feeding pipe is arranged at a distance of 150-300 mm above the quicklime layer, and the quicklime discharging pipe is arranged at a distance of 150-300 mm above the support plate I. The support plate II adopts a porous plate structure, and the minimum hole diameter is 0.1-0.5 mm.In the porcelain sand adsorption area, the porcelain sand is made of Lushan soil, zeolite powder, starch and FeSO4·7H2O mixed with deionized water, then dried to form spherical ceramic particles with a diameter of about 2-4 mm, and the pore size distribution is in the range of less than 6 nm and 20-80 nm. The ceramic particles have a good removal rate of fluoride ions, and the device can remove up to 99% of fluoride ions. The effluent strictly meets the fluoride ion pollutant discharge standard. The height ratio of the porcelain sand buffer layer to the rare earth porcelain sand particles is 1:2-1:4, and the height ratio of the rare earth porcelain sand particles to the device is 1:5-1:7. The porcelain sand particle feeding pipe is 150-300 mm above the rare earth porcelain sand particles, and the porcelain sand particle discharge pipe is 150-300 mm above the support plate II. The support plate III adopts a perforated plate structure with a minimum pore size of 0.1-0.5 mm. In the effluent area, the height of the effluent layer is 150-300 mm, accounting for 10-20% of the total device height. The overflow tank is set to a height of 50-100 mm, and is wrapped around the device with a width of 50-100 mm and a width-height ratio of 1-2. The filter head size is adapted to the size of the effluent pipe with a gap of 0.1-0.5 mm.

[0032] The raw water flows into the raw water tank and is pumped into the water distribution pipe by the raw water pump. The water flows uniformly from the water distribution pipe, flows from bottom to top, and flows through the quicklime reaction area. The quicklime particles are in a fluidized state under the scouring of the water flow from bottom to top. The fluoride ions in the raw water fully contact the fluidized quicklime, and a chemical precipitation reaction occurs to generate calcium fluoride precipitate. The calcium fluoride precipitate accumulates continuously and is eventually discharged from the quicklime discharge pipe. In this process, the quicklime is continuously consumed, and when the fluoride ion removal effect decreases, quicklime particles are added from the quicklime feeding pipe to ensure the fluoride ion removal effect of the raw water.

[0033] After the first layer of chemical precipitation method is completed, the water flows from bottom to top, and flows through the ceramic adsorption area. The iron oxide ceramic particles are in a fluidized state under the scouring of the water flow from bottom to top. The fluoride ions in the wastewater fully contact the fluidized iron oxide ceramic particles. The iron oxide ceramic particles have a clear pore structure, a wide pH range, and good adsorption capacity for fluoride ions. In this process, the adsorption performance of the iron oxide ceramic particles decreases continuously. When the fluoride ion removal effect decreases, the iron oxide ceramic particles with reduced adsorption performance are discharged from the ceramic particle discharge pipe, and new iron oxide ceramic particles are added from the ceramic particle feeding pipe to achieve the fluoride ion discharge standard of the effluent.

[0034] After the second layer of adsorption method is completed, the water flows from bottom to top, flows into the overflow tank, and is filtered through the filter head before flowing into the effluent pipe and being discharged.

[0035] This invention adopts a tower structure, combining chemical precipitation and adsorption methods for fluoride removal. The compact structure ensures that the effluent meets fluoride ion standards, simplifies the fluoride removal process, reduces the floor space required for the fluoride removal process, mitigates worker risks, and lowers project investment costs.

[0036] In summary, the integrated defluoridation device of the present invention can not only ensure that the fluoride ion concentration in the effluent meets the standards, but also optimize the working environment for staff. It is an environmentally friendly integrated defluoridation device with significant economic and environmental benefits. Attached Figure Description

[0037] Figure 1 This is a front view of the integrated defluorination device of the present invention.

[0038] Figure 2 This is a side view of the integrated defluorination device of the present invention.

[0039] Figure 3 This is a partial schematic diagram of the water inlet area of ​​the integrated defluoridation device of the present invention.

[0040] Figure 4 This is a top view of the integrated defluorination device of the present invention.

[0041] In the diagram: A-Inlet water zone, B-Quicklime reaction zone, C-Ceramic sand adsorption zone, D-Outlet water zone; 1-Inlet water pipe, 2-Inlet water pump, 3-Water distribution pipe, 4-Support plate I, 5-Quicklime discharge pipe, 6-Stop valve I, 7-Quicklime layer, 8-Quicklime buffer layer, 9-Stop valve II, 10-Quicklime feed pipe, 11-Support plate II, 12-Ceramic sand particle discharge pipe, 13-Stop valve III, 14-Rare earth ceramic sand particles, 15-Ceramic sand buffer layer, 16-Stop valve IV, 17-Ceramic sand particle feed pipe, 18-Support plate III, 19-Overflow trough, 20-Filter head, 21-Outlet water pipe. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Unless otherwise specified or conflicting, the preferred embodiments can be combined in any way.

[0043] like Figure 1 and Figure 2 As shown, the integrated defluoridation device of the present invention is configured with an inlet zone A, a quicklime reaction zone B, a ceramic sand adsorption zone C, and an outlet zone D.

[0044] The device is equipped with an inlet pipe 1, through which fluoride-containing wastewater is pumped into the inlet area A via inlet pump 2.

[0045] A water distribution pipe 3 is fixedly installed in the water inlet zone A, and a support plate I 4 is provided between the water inlet zone A and the quicklime reaction zone B;

[0046] The quicklime reaction zone B is fixedly provided with a quicklime layer 7, a quicklime buffer layer 8, a quicklime feeding pipe 10, a quicklime discharging pipe 5, a stop valve I 6 and a stop valve II 9, and a support plate II 11 is arranged between the quicklime reaction zone B and the porcelain sand adsorption zone C.

[0047] The porcelain sand adsorption zone C is fixedly provided with rare earth porcelain sand particles 14, a porcelain sand buffer layer 15, a porcelain sand particle feeding pipe 17, a porcelain sand particle discharging pipe 12, a stop valve III 13 and a stop valve IV 16, and a support plate III 18 is arranged between the porcelain sand adsorption zone C and the water outlet zone D; and the water outlet zone D is fixedly provided with an overflow tank 19, a filter head 20 and a water outlet pipe 21.

[0048] Preferably, referring to Figure 1 and Figure 4 , the present application adopts a cylindrical configuration, and the perforated plates are all circular structures.

[0049] Preferably, referring to Figure 1 and Figure 3 , the water flow linear velocity of the device of the present application is 0.5-1 m / h, and the contact time is 30-60 min.

[0050] Preferably, referring to Figure 1 and Figure 4 , the diameter of the device of the present application is 0.1-0.5 m, the height of the device is 0.5-1.5 m, and the diameter-height ratio is 1:6-1:8.

[0051] Preferably, referring to Figure 1 and Figure 4 , the fluorine ion concentration of the inlet water of the present application is required to be in the range of 300-1200 mg / L.

[0052] Preferably, referring to Figure 3 , the water distribution pipe 3 of the present application adopts a pipe type water distributor, and the raw water is introduced from one side of the horizontal main pipe and is distributed to the filler layer through the small holes on the branch pipes.

[0053] Preferably, referring to Figure 3 , the branch pipes of the water distribution pipe 3 are usually provided with 3-8 branch pipes, and the hole diameter of the small holes on the branch pipes is generally 3-5 mm and should not be less than 2 mm.

[0054] Preferably, referring to Figure 1 and Figure 2 , the water distribution pipe network of the present application is arranged at a distance of at least 80-120 mm from the support plate I 4.

[0055] Preferably, referring to Figure 1 and Figure 2 , the support plate I 4 of the present application adopts a perforated plate structure, and the minimum hole diameter is 0.1-0.5 mm.

[0056] Preferably, referring to Figure 1 andFigure 2 The effective calcium content of the lime used in the quicklime reaction zone B is 60% to 90%, and the total amount of the quicklime is determined according to the calcium-fluorine molar ratio of 0.8 to 1.1.

[0057] Preferably, referring to Figure 1 and Figure 2 In the quicklime reaction zone B, the quicklime layer 7 adopts a combination of small quicklime blocks and quicklime particles, the average particle size of the small quicklime blocks is controlled to be 2 to 5 cm, and the average particle size of the quicklime particles is controlled to be 0.3 to 0.8 cm.

[0058] Preferably, referring to Figure 1 and Figure 2 In the quicklime reaction zone B, the height ratio of the quicklime buffer layer 8 to the quicklime layer 7 is 1:3 to 1:5, and the height ratio of the quicklime layer 7 to the device is 1:2 to 1:2.5.

[0059] Preferably, referring to Figure 1 and Figure 2 In the quicklime reaction zone B, the quicklime feeding pipe 10 is located at a position 150 to 300 mm above the quicklime layer 7, and the quicklime discharging pipe 5 is located at a position 150 to 300 mm above the support plate I 4.

[0060] Preferably, referring to Figure 1 and Figure 2 The support plate II 11 adopts a porous plate structure, and the minimum pore size is 0.1 to 0.5 mm.

[0061] Preferably, referring to Figure 1 and Figure 2 In the porcelain sand adsorption zone C, the porcelain sand is spherical ceramic particles made by uniformly mixing Lushan soil, zeolite powder, starch, and FeSO4·7H2O with deionized water and then drying, the diameter of the particles is about 2 to 4 mm, and the pore size distribution is in the range of less than 6 nm and 20 to 80 nm.

[0062] Preferably, referring to Figure 1 and Figure 2 In the porcelain sand adsorption zone C, the height ratio of the porcelain sand buffer layer 15 to the rare earth porcelain sand particles 14 is 1:2 to 1:4, and the height ratio of the rare earth porcelain sand particles 14 to the device is 1:5 to 1:7.

[0063] Preferably, referring to Figure 1 and Figure 2 In the porcelain sand adsorption zone C, the porcelain sand particle feeding pipe 17 is located at a position 150 to 300 mm above the rare earth porcelain sand particles 14, and the porcelain sand particle discharging pipe 12 is located at a position 150 to 300 mm above the support plate II 11.

[0064] Preferably, referring to Figure 1 andFigure 2 The support plate III 18 of the present application adopts a porous plate structure, and the minimum pore size is 0.1-0.5 mm.

[0065] Preferably, referring to Figure 1 and Figure 4 In the water outlet area D of the present application, the height of the water outlet layer is 150-300 mm, accounting for 10%-20% of the total device height.

[0066] Preferably, referring to Figure 1 and Figure 4 In the water outlet area D of the present application, the height of the overflow tank 19 is set to 50-100 mm, and it is arranged around the outer circle of the device with a width of 50-100 mm and a width-height ratio of 1-2.

[0067] Preferably, referring to Figure 1 and Figure 2 In the water outlet area D of the present application, the size of the filter head 20 is adapted to the water outlet pipe 21, and the gap is 0.1-0.5 mm.

[0068] The size and proportion of each device of the present application can be set according to actual conditions. In the present embodiment, the water flow linear velocity of the device is 0.5-1 m / h, and the contact time is 30-60 min. The diameter of the device is 0.1-0.5 m, the height of the device is 0.5-1.5 m, and the diameter-height ratio is 1:6-1:8. The influent water fluoride ion concentration is required to be in the range of 300-1200 mg / L. The water distribution pipe branch is usually provided with 3-8 sub-pipes, and the diameter of the holes on the sub-pipes is generally 3-5 mm, and should not be less than 2 mm. The water distribution pipe network is arranged at a distance of at least 80-120 mm from the support plate I. The support plate I adopts a porous plate structure, and the minimum hole diameter is 0.1-0.5 mm. In the quicklime reaction zone, the quicklime used has an effective calcium content of 60%-90%, and the total amount of quicklime is determined according to the calcium-fluorine molar ratio of 0.8-1.1. The quicklime layer adopts a combination of small quicklime blocks and quicklime particles, the average particle size of the small quicklime blocks is controlled to be 2-5 cm, and the average particle size of the quicklime particles is controlled to be 0.3-0.8 cm. The height ratio of the quicklime buffer layer to the quicklime layer is 1:3-1:5, the height ratio of the quicklime layer to the device is 1:2-1:2.5, the quicklime feeding pipe is arranged at a distance of 150-300 mm above the quicklime layer, the quicklime discharge pipe is arranged at a distance of 150-300 mm above the support plate I, the support plate II adopts a porous plate structure, and the minimum hole diameter is 0.1-0.5 mm. In the porcelain sand adsorption zone, the porcelain sand has a diameter of about 2-4 mm, and the pore size distribution is in the range of less than 6 nm and 20-80 nm. The height ratio of the porcelain sand buffer layer to the rare earth porcelain sand particles is 1:2-1:4, the height ratio of the rare earth porcelain sand particles to the device is 1:5-1:7, the porcelain sand particle feeding pipe is arranged at a distance of 150-300 mm above the rare earth porcelain sand particles, and the porcelain sand particle discharge pipe is arranged at a distance of 150-300 mm above the support plate II. The support plate III adopts a porous plate structure, and the minimum hole diameter is 0.1-0.5 mm. In the effluent zone, the effluent layer has a height of 150-300 mm, accounting for 10%-20% of the total device height, the overflow tank has a height of 50-100 mm, and is arranged around the device with a width of 50-100 mm, a width-height ratio of 1-2, a filter head size adapted to the effluent pipe, and a gap of 0.1-0.5 mm. Through tests, the above size and proportion can better achieve the test purpose of the present application.

[0069] With reference to ​ and ​ , the wastewater treatment method by the above microbial fuel cell of the present application has the following process:

[0070] The fluorine-containing wastewater is pumped into the water inlet area A by the water inlet pump 2 through the water inlet pipe 1 and is uniformly discharged by the water distribution pipe 3, and the water flows from bottom to top, and when flowing through the quicklime reaction area B, the quicklime layer 7 is in a fluidized state under the scouring of the water flowing from bottom to top, the fluorine ions in the raw water fully contact with the quicklime in the fluidized state, a chemical precipitation reaction occurs, calcium fluoride precipitates are generated, the calcium fluoride precipitates continuously accumulate, and finally are discharged by the quicklime discharge pipe 5, in the process, the quicklime is continuously consumed, and when the fluorine ion removal effect decreases, the quicklime particles are added from the quicklime feeding pipe 10 to ensure the fluorine ion removal effect of the raw water.

[0071] After the first layer of chemical precipitation method is used to remove fluorine, the water flows from bottom to top, and when flowing through the porcelain sand adsorption area C, the rare earth porcelain sand particles 14 are in a fluidized state under the scouring of the water flowing from bottom to top, the fluorine ions in the wastewater fully contact with the rare earth porcelain sand particles 14 in the fluidized state, the rare earth porcelain sand particles have obvious pore structure and wide pH application range, and therefore have good adsorption capacity for fluorine ions, in the process, the adsorption capacity of the rare earth porcelain sand particles 14 continuously decreases, and when the fluorine ion removal effect decreases, the rare earth porcelain sand particles 14 with weakened adsorption capacity are discharged from the porcelain sand particle discharge pipe 12, and new rare earth porcelain sand particles 14 are added from the porcelain sand particle feeding pipe 17, so that the fluorine ion emission standard of the effluent water is reached.

[0072] After the second layer of adsorption method is used to remove fluorine, the water flows from bottom to top, flows into the overflow tank 19, is filtered through the filter head 20, and then flows into the effluent pipe 21 and is discharged.

[0073] In summary, the tower structure is adopted in the application, the chemical precipitation method and the adsorption method are combined to remove fluorine, the structure is compact, the fluorine ion emission standard of the effluent water is ensured, the fluorine ion removal process is simplified, the land area occupied by the fluorine removal process is reduced, the work risk of the staff is reduced, the engineering investment cost is reduced, and the application is an environment-friendly integrated fluorine removal device, and the economic benefit and the environmental benefit are remarkable.

[0074] The embodiments in the above description can be further combined or replaced, and the embodiments only describe the preferred embodiments of the application, and do not limit the concept and scope of the application, and various changes and improvements made by those skilled in the art to the technical solutions of the application without departing from the design idea of the application all belong to the protection scope of the application. The protection scope of the application is given by the appended claims and any equivalents thereof.

Claims

1. An integrated fluorine removal device, characterized by comprising: The device comprises, from bottom to top, a water inlet area (A), a quicklime reaction area (B), a porcelain sand adsorption area (C), and a water outlet area (D); The device is externally provided with a water inlet pipe (1), and the fluorine-containing wastewater is pumped into the water inlet area (A) through the water inlet pump (2) via the water inlet pipe (1); A water distribution pipe (3) is fixedly arranged in the water inlet area (A), and a support plate I (4) is arranged between the water inlet area (A) and the quicklime reaction area (B); The quicklime reaction area (B) is provided, from bottom to top, with a quicklime layer (7) and a quicklime buffer layer (8), the quicklime layer (7) is provided with a quicklime discharge pipe (5) and a stop valve I (6), the quicklime buffer layer (8) is provided with a quicklime feeding pipe (10) and a stop valve II (9), and a support plate II (11) is arranged between the quicklime reaction area (B) and the porcelain sand adsorption area (C); The porcelain sand adsorption area (C) is provided, from bottom to top, with a rare earth porcelain sand particle (14) and a porcelain sand buffer layer (15), the rare earth porcelain sand particle (14) is provided with a porcelain sand particle discharge pipe (12) and a stop valve III (13), and the porcelain sand buffer layer (15) is provided with a porcelain sand particle feeding pipe (17) and a stop valve IV (16), and a support plate III (18) is arranged between the porcelain sand adsorption area (C) and the water outlet area (D); The water outlet area (D) is fixedly provided with an overflow tank (19), a filter head (20), and a water outlet pipe (21); In the quicklime reaction area (B), the effective calcium content of the quicklime is 60% to 90%, the total amount of the quicklime is determined according to the calcium-fluorine molar ratio of 0.8 to 1.1, the quicklime layer (7) adopts a combination of small quicklime blocks and quicklime particles, the average particle size of the small quicklime blocks is controlled to be 2 to 5 cm, and the average particle size of the quicklime particles is controlled to be 0.3 to 0.8 cm; In the porcelain sand adsorption area (C), the porcelain sand is spherical ceramic particles made of the uniform mixture of Lushan soil, zeolite powder, starch, and FeSO4·7H2O, which is dried, the diameter of the particles is 2 to 4 mm, and the pore size distribution is in the range of less than 6 nm and 20 to 80 nm; The concentration of fluorine ions in the water inlet is required to be in the range of 300 to 1200 mg / L, the water flow linear velocity is 0.5 to 1 m / h, and the contact time is 30 to 60 min; The water distribution pipe network is arranged at a distance of at least 80 to 120 mm from the support plate I (4), the water distribution pipe (3) adopts a pipe type water distributor, the branch pipes are 3 to 8 in number, the hole diameter of the small holes on the branch pipes is 3 to 5 mm, and the hole diameter is not less than 2 mm; In the quicklime reaction area (B), the height ratio of the quicklime buffer layer (8) to the quicklime layer (7) is 1:3 to 1:5, the height ratio of the quicklime layer (7) to the device is 1:2 to 1:2.5, the quicklime feeding pipe (10) is arranged at a position 150 to 300 mm above the quicklime layer (7), and the quicklime discharge pipe (5) is arranged at a position 150 to 300 mm above the support plate I (4).

2. The integrated fluoride removal device of claim 1, wherein In the porcelain sand adsorption zone (C), the height ratio of the porcelain sand buffer layer (15) to the rare earth porcelain sand particles (14) is 1:2~1:4, the height ratio of the rare earth porcelain sand particles (14) to the device is 1:5~1:7, the porcelain sand particle feeding pipe (17) is located 150~300mm above the rare earth porcelain sand particles (14), and the porcelain sand particle discharge pipe (12) is located 150~300mm above the support plate II (11).

3. The integrated fluoride removal device of claim 1, wherein The support plate I (4), the support plate II (11) and the support plate III (18) adopt a porous plate structure, and the minimum pore diameter is 0.1~0.5mm.

4. The integrated fluoride removal device of claim 1, wherein In the water outlet zone (D), the height of the water outlet layer is 150~300mm, accounting for 10%~20% of the total height of the device, the height of the overflow tank (19) is set to 50~100mm, and it is arranged around the device with a width of 50~100mm and a width-height ratio of 1.0~2.

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5. The integrated fluoride removal device of claim 1, wherein In the water outlet zone (D), the size of the filter head (20) is matched with the water outlet pipe (21), and the gap is 0.1~0.5mm.

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