Deep fluorine removal system

Abstract

The utility model discloses a deep defluorination system and relates to the technical field of sewage and wastewater treatment. The device comprises a water inlet / outlet tank, a regeneration tank, a water outlet / inlet tank, a backwashing water tank, a water inlet lifting pump 1, a water inlet lifting pump 2, a backwashing pump and a deep defluorination device, control valves are respectively arranged in the middles of water outlet pipes of the water inlet / outlet pool, the regeneration pool and the water outlet / inlet pool, water outlet ends of the water outlet pipes of the water inlet / outlet pool and the regeneration pool are communicated through a water pipe and are provided with a regenerated liquid inlet control valve 2, and water outlet ends of the water outlet pipes of the regeneration pool and the water outlet / inlet pool are communicated through a water pipe and are provided with a regenerated liquid inlet control valve 3; the deep defluorination device is provided with two pressure type adsorption filter columns which are connected in series, and the two pressure type adsorption filter columns can be switched for use through valve control; the device is simple and reasonable in structure, and can reduce the height of the filter column, reduce the loss of a filter material, improve the defluorination efficiency, prolong the regeneration period of the filter column, improve the regeneration efficiency of the filter material and save the usage amount of a regeneration agent.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage and wastewater treatment, and particularly relates to a deep defluorination system. Background Technique

[0002] Fluoride-containing wastewater refers to wastewater containing fluoride ions generated in industrial production activities. After being discharged into the environment, this kind of wastewater will pose a serious threat to the water ecosystem and human health. Fluoride ions in fluoride-containing wastewater are extremely harmful to the ecological environment and human health. The treatment and purification of fluoride-containing wastewater have become an urgent need for current environmental protection.

[0003] In the prior art, the most common methods for treating fluoride-containing wastewater are the calcium salt precipitation method, the coagulation precipitation method, and the adsorption method;

[0004] The basic principle of the calcium salt precipitation method is to add slaked lime and calcium chloride to fluoride-containing wastewater, so that the fluoride ions in the wastewater react with calcium ions to produce CaF2 precipitation and be removed. It is particularly widely used in the treatment of high-concentration fluoride-containing wastewater. The fluoride content in the effluent after treatment by the calcium salt precipitation method is in the range of 15 - 30 mg / L, and it is difficult to further reduce the concentration of fluoride in the treated water to a greater extent;

[0005] The basic principle of the coagulation precipitation method is to add a coagulant to fluoride-containing water to form flocs and adsorb fluoride ions. The fluoride content in the effluent after treatment by the coagulation precipitation method is in the range of 5 - 10 mg / L;

[0006] The basic principle of the adsorption method is that fluoride ions in water diffuse to the surface of the solid adsorbent. The adsorption force between the traditional adsorbent and fluoride ions is weak, the adsorption capacity for fluoride ions in wastewater is small, the operation cycle is short, the removal effect on fluoride ions in wastewater is poor, and the repeated use effect of adsorbent regeneration and recycling is not good. There are disadvantages such as high treatment cost and complex operation when treating fluoride-containing wastewater.

[0007] In addition, in order to improve the adsorption capacity, the existing adsorption treatment equipment often requires a relatively high filter column, which not only affects equipment construction and space requirements, but also further expands the difficulty of recycling and reusing the high filter column; Therefore, there is an urgent need for a deep defluorination system to solve these problems. Content of the Utility Model

[0008] The purpose of the utility model is to provide a deep defluorination system to solve the problems mentioned in the above background technique.

[0009] To achieve the above object, the utility model provides the following technical solution: A deep defluorination system, including an inlet / outlet water tank, a regeneration tank, an outlet / inlet water tank, a backwash water tank, an inlet lift pump 1, an inlet lift pump 2, a backwash pump and a deep defluorination device; in the outlet pipes of the inlet / outlet water tank, the regeneration tank and the outlet / inlet water tank, there are respectively provided an inlet lift pump 1 inlet pipe control valve, a regeneration liquid inlet control valve 1 and an inlet lift pump 2 inlet pipe control valve. Between the outlet ends of the outlet pipes of the inlet / outlet water tank and the regeneration tank, they are connected by a water pipe and provided with a regeneration liquid inlet control valve 2. Between the outlet ends of the outlet pipes of the regeneration tank and the outlet / inlet water tank, they are connected by a water pipe and provided with a regeneration liquid inlet control valve 3. One end of the inlet lift pump 1 is connected between the inlet lift pump 1 inlet pipe control valve and the regeneration liquid inlet control valve 2. One end of the inlet lift pump 2 is connected between the inlet lift pump 2 inlet pipe control valve and the regeneration liquid inlet control valve 3. The other ends of the inlet lift pump 1 and the inlet lift pump 2 are respectively connected to the inlet end and the outlet end of the deep defluorination device. The backwash water tank is connected to the backwash pump through a backwash pipeline and is connected to the backwash water pipe of the deep defluorination device.

[0010] The deep defluorination device is provided with two pressure type adsorption filter columns in series. At the lower ends of the two filter columns, there are respectively provided two interfaces, and are respectively connected with a filter column 1 lower inlet pipe control valve, a filter column 1 lower outlet pipe control valve and a filter column 2 lower inlet pipe control valve, a filter column 2 lower outlet pipe control valve. At the upper ends of the two filter columns, there are respectively provided two interfaces, and are respectively connected with a filter column 1 upper inlet pipe control valve, a filter column 1 upper outlet pipe control valve and a filter column 2 upper inlet pipe control valve, a filter column 2 upper outlet pipe control valve. The end of the filter column 1 lower inlet pipe control valve away from the filter column 1 is connected and communicated with one of the inlet lift pump 1 or the inlet lift pump 2. The end of the filter column 2 lower outlet pipe control valve away from the filter column 2 is connected and communicated with the other of the inlet lift pump 1 or the inlet lift pump 2. The ends of the filter column 1 lower outlet pipe control valve away from the filter column 1, the filter column 1 upper outlet pipe control valve away from the filter column 1, the filter column 2 upper inlet pipe control valve away from the filter column 2 and the filter column 2 lower inlet pipe control valve away from the filter column 2 are connected and communicated, and are connected with a backwash water pipe.

[0011] Preferably, the inlet pipes of the inlet / outlet water tank and the outlet / inlet water tank are respectively provided with an inlet pipe control valve and an outlet pipe control valve. Between the inlet end of the inlet pipe control valve and the outlet end of the outlet pipe control valve, they are connected by a water pipe and provided with an inlet / outlet pipe connection control valve 1. Between the outlet end of the inlet pipe control valve and the inlet end of the outlet pipe control valve, they are connected by a water pipe and provided with an inlet / outlet pipe connection control valve 2.

[0012] Preferably, the inlet lift pumps 1 and 2 are respectively provided with an outlet pipe control valve for the inlet lift pump 1 and an outlet pipe control valve for the inlet lift pump 2 on the pipelines connecting them to the deep defluorination device. One end of the inlet lift pump 1 away from the outlet pipe control valve of the inlet lift pump 1 and one end of the outlet pipe control valve of the inlet lift pump 1 away from the inlet lift pump 1 are connected through a bypass pipe and are provided with a bypass pipe control valve for the inlet lift pump 1. One end of the inlet lift pump 2 away from the outlet pipe control valve of the inlet lift pump 2 and one end of the outlet pipe control valve of the inlet lift pump 2 away from the inlet lift pump 2 are connected through a bypass pipe and are provided with a bypass pipe control valve for the inlet lift pump 2.

[0013] Preferably, an inlet control valve for the backwash pump is provided on the backwash pipeline, and an outlet pipe control valve for the backwash pump is provided on the pipeline connecting the backwash pump to the deep defluorination device; the deep defluorination device is connected with two backwash drain pipes. One is connected between the inlet pipe control valve and the outlet pipe control valve on the filter column 1, and the other is connected between the inlet pipe control valve and the outlet pipe control valve on the filter column 2. A backwash pipe control valve is provided on the backwash drain pipe.

[0014] Preferably, the deep defluorination device is connected with two regenerated waste liquid drain pipes. One is connected between the lower inlet pipe control valve and the upper inlet pipe control valve of the filter column 1, and the other is connected between the lower outlet pipe control valve and the upper outlet pipe control valve of the filter column 2. A control valve for the regenerated waste liquid discharge pipe is provided on the regenerated waste liquid drain pipe.

[0015] Preferably, the height of the pressure adsorption filter column does not exceed 2 meters.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. The deep defluorination system has a simple and reasonable structure. By using two filter columns with switchable inlet directions in series instead of a single high filter column, the height of the equipment can be reduced to within 2 meters, saving vertical space. Intelligent operation can be achieved by using electric control valves. The backwash, regeneration, and inlet water flow directions can be freely switched, with simple operation and high-efficiency and stable operation.

[0018] 2. In the deep defluorination system, the raw water of the filter column can first flow in from the bottom and out from the top, and then flow in from the top and out from the bottom. The filter media can be fully utilized, the adsorption capacity of the filter media for fluoride increases, the operation cycle becomes longer, the regeneration efficiency of the filter media can be improved, the operation cycle of the system can be further extended, and the usage amount of the regeneration agent can be saved. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the deep defluorination system of the present utility model;

[0020] Figure 2 It is a schematic diagram of the deep defluorination device in the deep defluorination system of the present utility model.

[0021] In the figure: 1. Inlet lift pump 1; 2. Inlet lift pump 2; 3. Backwashing pump; 4. Inlet / outlet water tank; 5. Regeneration tank; 6. Outlet / inlet water tank; 7. Backwashing water tank; 8. Inlet pipe control valve of inlet lift pump 1; 9. Regenerated liquid inlet control valve 1; 10. Inlet pipe control valve of inlet lift pump 2; 11. Inlet pipe control valve of backwashing pump; 12. Regenerated liquid inlet control valve 2; 13. Regenerated liquid inlet control valve 3; 14. Bypass pipe control valve of inlet lift pump 1; 15. Outlet pipe control valve of inlet lift pump 1; 16. Bypass pipe control valve of inlet lift pump 2; 17. Outlet pipe control valve of inlet lift pump 2; 18. Outlet pipe control valve of backwashing pump; 19. Deep defluorination device; 20. Inlet pipe control valve; 21. Connecting pipe control valve 1 of inlet and outlet pipes; 22. Connecting pipe control valve 2 of inlet and outlet pipes; 23. Outlet pipe control valve; 24. Backwashing pipe control valve; 25. Regenerated waste liquid discharge pipe control valve.

[0022] 19-a. Lower inlet pipe control valve of filter column 1; 19-b. Upper inlet pipe control valve of filter column 1; 19-c. Lower outlet pipe control valve of filter column 1; 19-d. Upper outlet pipe control valve of filter column 1; 19-e. Lower inlet pipe control valve of filter column 2; 19-f. Upper inlet pipe control valve of filter column 2; 19-g. Lower outlet pipe control valve of filter column 2; 19-h. Upper outlet pipe control valve of filter column 2; 19-i. Automatic exhaust valve 1; 19-j. Automatic exhaust valve 2; 19-k. Upper filter plate of filter column 2; 19-l. Upper filter plate of filter column 1; 19-m. Lower filter plate of filter column 1; 19-n. Lower filter plate of filter column 2. Detailed implementation manner

[0023] As Figure 1 and 2As shown in the figure, a deep defluorination system includes an inlet / outlet water tank 4, a regeneration tank 5, an outlet / inlet water tank 6, a backwashing water tank 7, an inlet lift pump 1, an inlet lift pump 2, a backwashing pump 3, and a deep defluorination device 19; in the outlet pipes of the inlet / outlet water tank 4, the regeneration tank 5, and the outlet / inlet water tank 6, an inlet lift pump 1 inlet pipe control valve 8, a regeneration liquid inlet control valve 1 (labeled 9 in the figure), and an inlet lift pump 2 inlet pipe control valve 10 are respectively provided. Between the outlet ends of the outlet pipes of the inlet / outlet water tank 4 and the regeneration tank 5, they are connected by a water pipe and a regeneration liquid inlet control valve 2 (labeled 12 in the figure) is provided. Between the outlet ends of the outlet pipes of the regeneration tank 5 and the outlet / inlet water tank 6, they are connected by a water pipe and a regeneration liquid inlet control valve 3 (labeled 13 in the figure) is provided. One end of the inlet lift pump 1 is connected between the inlet lift pump 1 inlet pipe control valve 8 and the regeneration liquid inlet control valve 2 (labeled 12 in the figure), and one end of the inlet lift pump 2 is connected between the inlet lift pump 2 inlet pipe control valve 10 and the regeneration liquid inlet control valve 3 (labeled 13 in the figure). The other ends of the inlet lift pump 1 and the inlet lift pump 2 are respectively connected to the inlet end and the outlet end of the deep defluorination device 19. The backwashing water tank 7 is connected to the backwashing pump 3 through a backwashing pipeline and is connected to the backwashing water pipe of the deep defluorination device 19;

[0024] The deep defluorination device 19 is provided with two pressure adsorption filter columns connected in series. At the lower ends of the two filter columns, two interfaces are respectively provided and are respectively connected with a filter column 1 lower inlet pipe control valve 19-a, a filter column 1 lower outlet pipe control valve 19-c, a filter column 2 lower inlet pipe control valve 19-e, and a filter column 2 lower outlet pipe control valve 19-g. At the upper ends of the two filter columns, two interfaces are respectively provided and are respectively connected with a filter column 1 upper inlet pipe control valve 19-b, a filter column 1 upper outlet pipe control valve 19-d, a filter column 2 upper inlet pipe control valve 19-f, and a filter column 2 upper outlet pipe control valve 19-h; The end of the filter column 1 lower inlet pipe control valve 19-a away from the filter column 1 is connected and communicated with one of the inlet lift pump 1 or the inlet lift pump 2. The end of the filter column 2 lower outlet pipe control valve 19-g away from the filter column 2 is connected and communicated with the other of the inlet lift pump 1 or the inlet lift pump 2. The end of the filter column 1 lower outlet pipe control valve 19-c away from the filter column 1, the end of the filter column 1 upper outlet pipe control valve 19-d away from the filter column 1, the end of the filter column 2 upper inlet pipe control valve 19-f away from the filter column 2, and the end of the filter column 2 lower inlet pipe control valve 19-e away from the filter column 2 are connected and communicated, and a backwashing water pipe is connected.

[0025] To achieve the switching of the water inlet / outlet directions of the water inlet / outlet tank 4 and the water outlet / inlet tank 6, the following solution can be adopted: The inlet pipes of the water inlet / outlet tank 4 and the water outlet / inlet tank 6 are respectively provided with an inlet pipe control valve 20 and an outlet pipe control valve 23. The inlet end of the inlet pipe control valve 20 and the outlet end of the outlet pipe control valve 23 are connected through a water pipe and are provided with an inlet / outlet pipe connecting pipe control valve 1 (labeled 21 in the figure). The outlet end of the inlet pipe control valve 20 and the inlet end of the outlet pipe control valve 23 are connected through a water pipe and are provided with an inlet / outlet pipe connecting pipe control valve 2 (labeled 22 in the figure).

[0026] Since the two pumps can be used alternately by reversing the water inlet / outlet directions, bypass pipes can be set to bypass the unused pumps. Specifically, on the pipelines connecting the water inlet lift pump 1 and the water inlet lift pump 2 to the deep defluorination device 19, there are respectively a water inlet lift pump 1 outlet pipe control valve 15 and a water inlet lift pump 2 outlet pipe control valve 17. Between one end of the water inlet lift pump 1 far from the water inlet lift pump 1 outlet pipe control valve 15 and one end of the water inlet lift pump 1 outlet pipe control valve 15 far from the water inlet lift pump 1, they are connected through a bypass pipe and are provided with a water inlet lift pump 1 bypass pipe control valve 14. Between one end of the water inlet lift pump 2 far from the water inlet lift pump 2 outlet pipe control valve 17 and one end of the water inlet lift pump 2 outlet pipe control valve 17 far from the water inlet lift pump 2, they are connected through a bypass pipe and are provided with a water inlet lift pump 2 bypass pipe control valve 16.

[0027] Correspondingly, on the backwashing pipeline, there can be a backwashing pump inlet control valve 11. On the pipeline connecting the backwashing pump 3 to the deep defluorination device 19, there is a backwashing pump outlet pipe control valve 18. The deep defluorination device 19 is connected with two backwashing drain pipes. One is connected between the inlet pipe control valve 19-b and the outlet pipe control valve 19-d on the filter column 1, and the other is connected between the inlet pipe control valve 19-f and the outlet pipe control valve 19-h on the filter column 2. A backwashing pipe control valve 24 is provided on the backwashing drain pipe.

[0028] Correspondingly, the deep defluorination device 19 is connected with two regeneration waste liquid drain pipes. One is connected between the lower inlet pipe control valve 19-a and the upper inlet pipe control valve 19-b of the filter column 1, and the other is connected between the lower outlet pipe control valve 19-g and the upper outlet pipe control valve 19-h of the filter column 2. A regeneration waste liquid discharge pipe control valve 25 is provided on the regeneration waste liquid drain pipe.

[0029] In addition, the valves involved above are all preferably electric valves, and the opening and closing of the valves can be realized through intelligent control. The pumps are all preferably variable frequency pumps, which are convenient for adjusting the flow rate and pressure;

[0030] For reference, the deep defluorination device 19 as described above is composed of two pressure filter columns connected in series. In a relatively optimal implementation mode, the height of the filter column is in the range of 1.5 m - 2 m. The specific filling height and diameter of the filter material in a single filter column need to be calculated according to the specifications. The filter material filled in the filter column is activated alumina or other renewable new materials that can adsorb fluoride. An automatic exhaust valve is provided at the top of the pressure defluorination filter column; usually, the filter column is divided into three sections, each section is connected by a flange. The upper section is the filter material expansion area and the upper water distribution area, the middle section is the filter material filling area, and the lower section is the lower water distribution area. Between the filter material expansion area and the upper water distribution area in the upper section, and between the lower section and the middle section, they are separated by filter plates. The diameter of the water passing holes in the filter plates should be smaller than the particle size of the filter material. The bottom of the filter material layer in the middle section is the supporting layer, and the thickness of the supporting layer is generally 50 mm - 100 mm. The defluorination filter column is already a relatively mature technology, and there is no special improvement in the present utility model, and products purchased from the market can be directly used. However, due to the adoption of the solution of the present utility model, two filter columns with lower height can be used instead of a single higher filter column, which is more advantageous both for the requirement of longitudinal space and for safety and construction difficulty considerations.

[0031] After adopting the above deep defluorination system, the switching of the upper and lower water and the front and rear water inlet of the filter column can be realized. For specific methods, reference can be made to the following:

[0032] During one operation cycle, the influent lift pump 1, valves 8, 15, 16, and 10 are opened, valves 12, 13, 14, and 17 are closed, valves 19-a, 19-d, 19-e, and 19-h are opened, valves 19-b, 19-c, 19-f, and 19-g are closed. The raw water first enters from the lower end of the deep defluorination device and exits from the upper end. After operating for a period of time t1, it is switched to enter from the upper end and exit from the lower end, that is, valves 19-b, 19-c, 19-f, and 19-g are opened, valves 19-a, 19-d, 19-e, and 19-h are closed. After operating for another period of time t2, the water discharged twice is mixed. When the fluoride ion concentration in the mixed water exceeds the drainage standard, the water inlet is stopped and the adsorption filter material is backwashed and regenerated. First, a backwash is carried out, that is, the backwash pump 3 is opened, valves 11, 18, 19-c, 19-e, and 24 are opened, 19-d, 19-f, 19-b, and 19-h are closed, and the backwash time is t3; then a regeneration is carried out, that is, the influent lift pump 1 is opened, valves 8, 13, 14, 16, 17, 19-a, 19-d, 19-e, and 19-h are closed, valves 9, 12, 15, 19-b, 19-c, 19-f, 19-g, and 25 are opened, and the regeneration time is t4; then a secondary regeneration is carried out, that is, the influent lift pump 2 is opened, valves 10, 12, 14, 15, and 16 are closed, valves 9, 13, 17, 19-h, 19-e, 19-d, 19-a, and 25 are opened, and the regeneration time is t5; finally, a secondary backwash is carried out, and the operation is the same as the first backwash, and the secondary backwash time is t6; after the secondary backwash is completed, the next operation cycle is entered. Valves 20 and 23 are closed, valves 21 and 22 are opened, the water inlet tank is switched to the water outlet tank, the water outlet tank is switched to the water inlet tank, and the influent lift pump 2 is opened for deep defluorination. The subsequent filter columns in series are converted into the front filter columns, and the front filter columns are converted into the subsequent filter columns.

[0033] The above operation time t1, t2, regeneration time t3, t4, backwash time t5, and t6 should all be determined by experiments according to the actual situation.

[0034] During one operation cycle, the raw water flow direction in the filter column is first from bottom to top and then from top to bottom. The effluent is discharged after mixing. The regeneration waste liquid and backwash wastewater need to enter the front section of the sewage treatment plant for treatment and then enter the deep defluorination system for treatment. After reaching the standard, it can be discharged.

[0035] The actual operation situation can also be modified according to the system design of the present utility model. For example, first from top to bottom and then, for example, in the way of one up and one down inlet, etc. However, the above reference method has been determined by experiments and can improve the filter material regeneration efficiency by 10%. Therefore, it can be used to increase the adsorption capacity of the filter column for fluoride ions in wastewater, extend the system operation cycle and the service life of the deep defluorination device, and reduce the treatment cost of fluoride-containing wastewater.

[0036] The above are only the preferred embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope defined by the claims.

[0037] For the parts not detailed in the present utility model, they are all well-known technologies to those skilled in the art.

Claims

1. A deep defluorination system, characterized in that: It includes an inlet / outlet water tank (4), a regeneration tank (5), an outlet / inlet water tank (6), a backwash water tank (7), an inlet lift pump 1 (1), an inlet lift pump 2 (2), a backwash pump (3), and a deep defluorination device (19); in the outlet pipes of the inlet / outlet water tank (4), the regeneration tank (5), and the outlet / inlet water tank (6), there are respectively provided an inlet lift pump 1 inlet pipe control valve (8), a regeneration liquid inlet control valve 1 (9), and an inlet lift pump 2 inlet pipe control valve (10). Between the outlet ends of the outlet pipes of the inlet / outlet water tank (4) and the regeneration tank (5), they are connected by a water pipe and there is provided a regeneration liquid inlet control valve 2 (12). Between the outlet ends of the outlet pipes of the regeneration tank (5) and the outlet / inlet water tank (6), they are connected by a water pipe and there is provided a regeneration liquid inlet control valve 3 (13). One end of the inlet lift pump 1 (1) is connected between the inlet lift pump 1 inlet pipe control valve (8) and the regeneration liquid inlet control valve 2 (12), and one end of the inlet lift pump 2 (2) is connected between the inlet lift pump 2 inlet pipe control valve (10) and the regeneration liquid inlet control valve 3 (13). The other ends of the inlet lift pump 1 (1) and the inlet lift pump 2 (2) are respectively connected to the inlet end and the outlet end of the deep defluorination device (19). The backwash water tank (7) is connected to the backwash pump (3) through a backwash pipeline and is connected to the backwash water pipe of the deep defluorination device (19). The deep defluorination device (19) is provided with two pressure adsorption filter columns connected in series. At the lower ends of the two filter columns, there are respectively provided two interfaces, and are respectively connected with a filter column 1 lower inlet pipe control valve (19-a), a filter column 1 lower outlet pipe control valve (19-c), and a filter column 2 lower inlet pipe control valve (19-e), a filter column 2 lower outlet pipe control valve (19-g). At the upper ends of the two filter columns, there are respectively provided two interfaces, and are respectively connected with a filter column 1 upper inlet pipe control valve (19-b), a filter column 1 upper outlet pipe control valve (19-d), and a filter column 2 upper inlet pipe control valve (19-f), a filter column 2 upper outlet pipe control valve (19-h); the ends of the filter column 1 lower inlet pipe control valve (19-a) and the filter column 1 upper inlet pipe control valve (19-b) far from the filter column 1 are connected and connected to one of the inlet lift pump 1 (1) or the inlet lift pump 2 (2). The ends of the filter column 2 lower outlet pipe control valve (19-g) and the filter column 2 upper outlet pipe control valve (19-h) far from the filter column 2 are connected and connected to the other of the inlet lift pump 1 (1) or the inlet lift pump 2 (2). The ends of the filter column 1 lower outlet pipe control valve (19-c) far from the filter column 1, the ends of the filter column 1 upper outlet pipe control valve (19-d) far from the filter column 1, the ends of the filter column 2 upper inlet pipe control valve (19-f) far from the filter column 2, and the ends of the filter column 2 lower inlet pipe control valve (19-e) far from the filter column 2 are connected, and are connected with a backwash water pipe.

2. The deep defluorination system according to claim 1, wherein: The inlet pipes of the inlet / outlet water tank (4) and the outlet / inlet water tank (6) are respectively provided with an inlet pipe control valve (20) and an outlet pipe control valve (23). The inlet end of the inlet pipe control valve (20) and the outlet end of the outlet pipe control valve (23) are connected through a water pipe and are provided with an inlet / outlet pipe connecting pipe control valve 1 (21). The outlet end of the inlet pipe control valve (20) and the inlet end of the outlet pipe control valve (23) are connected through a water pipe and are provided with an inlet / outlet pipe connecting pipe control valve 2 (22).

3. The deep defluorination system according to claim 1, wherein: On the pipelines where the inlet water lift pump 1 (1) and the inlet water lift pump 2 (2) are connected to the deep defluorination device (19), there are respectively an inlet water lift pump 1 outlet pipe control valve (15) and an inlet water lift pump 2 outlet pipe control valve (17). The end of the inlet water lift pump 1 (1) far from the inlet water lift pump 1 outlet pipe control valve (15) and the end of the inlet water lift pump 1 outlet pipe control valve (15) far from the inlet water lift pump 1 (1) are connected through a bypass pipe and are provided with an inlet water lift pump 1 bypass pipe control valve (14). The end of the inlet water lift pump 2 (2) far from the inlet water lift pump 2 outlet pipe control valve (17) and the end of the inlet water lift pump 2 outlet pipe control valve (17) far from the inlet water lift pump 2 (2) are connected through a bypass pipe and are provided with an inlet water lift pump 2 bypass pipe control valve (16).

4. The deep defluorination system according to claim 1, characterized in that: The reverse flushing pipeline is provided with a reverse flushing pump inlet control valve (11). The pipeline where the reverse flushing pump (3) is connected to the deep defluorination device (19) is provided with a reverse flushing pump outlet pipe control valve (18). The deep defluorination device (19) is connected with two reverse flushing drain pipes. One is connected between the inlet pipe control valve (19-b) on the filter column 1 and the outlet pipe control valve (19-d) on the filter column 1, and the other is connected between the inlet pipe control valve (19-f) on the filter column 2 and the outlet pipe control valve (19-h) on the filter column 2. The reverse flushing drain pipe is provided with a reverse flushing pipe control valve (24).

5. The deep defluorination system according to claim 1, characterized in that: The deep defluorination device (19) is connected with two regenerated waste liquid drain pipes. One is connected between the lower inlet pipe control valve (19-a) of the filter column 1 and the upper inlet pipe control valve (19-b) of the filter column 1, and the other is connected between the lower outlet pipe control valve (19-g) of the filter column 2 and the upper outlet pipe control valve (19-h) of the filter column 2. The regenerated waste liquid drain pipe is provided with a regenerated waste liquid discharge pipe control valve (25).

6. The deep defluorination system according to claim 1, wherein: The height of the pressure adsorption filter column does not exceed 2 meters.

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