Multi-stage purification treatment equipment and method for waste gas of power plant

Abstract

The invention belongs to the technical field of power plant waste gas treatment, and discloses power plant waste gas multi-stage purification treatment equipment and method.The equipment comprises a bottom plate, a filter box, a disinfection box, a spraying box and a purification module, a first pump body and a third pump body are installed on the filter box, the first pump body is connected with a collecting box, the third pump body is connected with a settling box, and the settling box is connected with a storage box; a filter tank is arranged on the disinfection box; a fourth pump body is arranged on the disinfection box; the fourth pump body is connected with a return pipe; the return pipe is connected with a water storage tank; the end, away from the water guide pipe, of the water conveying pipe penetrates through the spraying box and then is connected with the outer surface of the splitter plate. Spraying wastewater can be purified and recycled, water resources are saved, and the operation cost is reduced.

Description

Technical Field

[0001] This application belongs to the field of power plant exhaust gas treatment technology, and in particular relates to a multi-stage purification treatment device and method for power plant exhaust gas. Background Technology

[0002] Multi-stage exhaust gas purification equipment for power plants is an integrated treatment system specifically designed for the complex exhaust gases emitted by power plants (especially coal-fired and gas-fired power plants). These exhaust gases are highly complex, containing various pollutants such as dust, sulfur dioxide, nitrogen oxides, heavy metals, and volatile organic compounds. This equipment employs a tiered, targeted purification logic, taking precise treatment measures for different types of pollutants one by one to achieve step-by-step removal of pollutants. Ultimately, it ensures that exhaust gas emissions fully meet environmental standards, providing crucial support for the green and compliant operation of power plants.

[0003] However, in the current wastewater treatment process of most power plants, the wastewater generated in the spraying stage is often discharged directly without undergoing systematic purification and recycling treatment. This not only causes serious waste of water resources, but also increases the operating costs and environmental pressure of enterprises. Summary of the Invention

[0004] The purpose of this application is to provide a multi-stage purification treatment device and method for power plant exhaust gas, which solves the problem of wastewater being directly discharged without system purification and recycling in the prior art, thus wasting water resources.

[0005] To achieve the above objectives, this application provides the following technical solution: In a first aspect, this application provides a multi-stage purification treatment device for power plant exhaust gas, comprising a base plate, on which a filter box and a disinfection box are installed. A spray box is mounted on the filter box and connected to a purification module. A first pump body is mounted on the filter box, with its output end connected to a collection box. A third pump body is mounted on the filter box and connected to a sedimentation box. The sedimentation box is connected to a storage box. A conveying module is installed below the storage box and extends into the sedimentation box. A waste box is located below the sedimentation box. A filter tank is mounted on the disinfection box. A fourth pump body is mounted on the disinfection box, with its output end connected to a return pipe. The return pipe is connected to a water storage tank. A second pump body is mounted on the water storage tank, with its output end connected to a water guide pipe. The water guide pipe is connected to a water supply pipe, and the end of the water supply pipe away from the water guide pipe passes through the spray box and connects to the outer surface of a diversion plate.

[0006] In some embodiments, the filter box contains a filter plate, and a motor, a threaded rod, a movable block, a positioning rod, a slider, and a suction nozzle are installed outside the filter box. The motor drives the threaded rod to rotate, causing the movable block to move horizontally along the threaded rod, and the slider to slide synchronously along the positioning rod, driving the suction nozzle to reciprocate on the surface of the filter plate. The input end of the first pump body is connected to a suction pipe, which communicates with the suction nozzle.

[0007] In some embodiments, a plurality of diversion plates are installed inside the spray box, and a plurality of nozzles are connected to the bottom surface of each diversion plate. A filling block is installed inside the spray box, and an air guide pipe is connected to the outer surface of the spray box. A first valve is installed on the outer surface of the air guide pipe, and the end of the air guide pipe away from the spray box is connected to the purification module.

[0008] In some embodiments, the outer surface of the sedimentation tank is connected to a plurality of support columns, and the side of each support column away from the sedimentation tank is connected to the upper surface of the base plate.

[0009] In some embodiments, the disinfection box is provided with a fixed base, the filter canister is installed on the fixed base, and a second flange is installed on the outer surface of the filter canister through a metal tube. The inner walls of the second flange and the first flange are threadedly connected with a plurality of second fixing screws.

[0010] In some embodiments, the filter canister is equipped with activated carbon blocks and chelating resin blocks.

[0011] In some embodiments, the output end of the third pump body is connected to a connecting pipe, the connecting pipe is connected to the sedimentation tank, the outer surface of the sedimentation tank is connected to a drain pipe, the outer surface of the drain pipe is equipped with a third valve, and the end of the drain pipe away from the sedimentation tank is connected to a first flange.

[0012] In some embodiments, a second valve is installed on the bottom surface of the sedimentation tank, and a waste bin is disposed below the second valve.

[0013] In some embodiments, the disinfection box is equipped with several ultraviolet generating modules.

[0014] In some embodiments, a controller is mounted on the outer surface of the filter box.

[0015] In some embodiments, an injection pipe is installed on the outer surface of the spray box.

[0016] Secondly, this application provides a multi-stage purification treatment method for power plant exhaust gas, employing the aforementioned equipment, including: Step 1: Wastewater enters the filter box, the filter plate intercepts large particles of impurities, the motor drives the suction nozzle to reciprocate on the surface of the filter plate, and the first pump body pumps the dust to the collection box. Step 2: Wastewater is pumped into the sedimentation tank by the third pump. Flocculant is added to the storage tank to settle the suspended solids. The second valve discharges the sediment into the waste tank. The clear liquid on top enters the filter tank through the drainage pipe. Step 3: After the clean liquid is adsorbed by the activated carbon block and the chelating resin block, and disinfected by the ultraviolet generation module of the disinfection box, the fourth pump returns the cleaning liquid to the water storage tank for recycling.

[0017] Compared with existing technologies, the multi-stage purification equipment and method for power plant exhaust gas provided in this application have the following advantages: This application uses a filter plate to initially intercept large particles of dust and solid impurities in wastewater. Then, a motor drives a suction nozzle to move back and forth on the surface of the filter plate, and the first pump body pumps the collected impurities to the collection box in real time. This design can not only avoid the efficiency reduction caused by impurity blockage in traditional filtration devices, but also prevent the accumulation of impurities from affecting the filtration accuracy of subsequent treatment stages, ensuring the continuous and efficient operation of the equipment.

[0018] This application utilizes a third pump to transport pre-purified wastewater to a sedimentation tank via a connecting pipe. The storage tank precisely adds flocculant to the sedimentation tank through a material conveying module, causing suspended particles and heavy metal ions in the wastewater to quickly coagulate and form precipitates, achieving deep filtration of the wastewater and significantly reducing the concentration of pollutants in the water.

[0019] This application introduces the supernatant into the filter tank through a diversion pipe. The activated carbon block inside efficiently adsorbs odors and organic pollutants in the water, while the chelating resin block specifically removes residual heavy metal ions. The treated wastewater flows into the disinfection tank and is thoroughly rendered harmless by ultraviolet irradiation generated by the ultraviolet generation module. Finally, the fourth pump pumps the purified wastewater back to the storage tank for reuse as a spray washing liquid, thus avoiding waste of water resources. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the technical description will be briefly introduced below.

[0021] Figure 1 This is a front view of the multi-stage purification and treatment equipment for power plant exhaust gas provided in this application. Figure 2 This is a rear view of the multi-stage purification and treatment equipment for power plant exhaust gas provided in this application. Figure 3 A side sectional view of the multi-stage purification and treatment equipment for power plant exhaust gas provided in this application; Figure 4 A cross-sectional view of the filter tank provided in this application; Figure 5 This is a structural schematic diagram of the disinfection box provided in this application; Figure 6 This is a schematic diagram of the filter box provided in this application; Figure 7 This is a schematic diagram of the nozzle structure provided in this application; Figure 8 A schematic diagram of the structure of the first flange provided in this application; Figure 9 A flowchart of the multi-stage purification treatment method for power plant exhaust gas provided in this application.

[0022] Explanation of reference numerals in the attached figures: 1. Base plate; 2. Filter box; 3. Motor; 4. Threaded rod; 5. Movable block; 6. Positioning rod; 7. Slider; 8. Suction nozzle; 9. First pump body; 10. Pull pipe; 11. Collection box; 12. Spray box; 13. Controller; 14. Diverter plate; 15. Spray head; 16. Water storage tank; 17. Second pump body; 18. Water guide pipe; 19. Water delivery pipe; 20. Air guide pipe; 21. First valve; 22. Purification module; 23. Third pump body; 24. Connecting pipe; 25. Sedimentation tank; 26. Support 27. Support column; 28. Storage bin; 29. ​​Conveying module; 30. Second valve; 31. Waste bin; 32. Drain pipe; 33. Third valve; 34. First flange; 35. Disinfection box; 36. Ultraviolet generator module; 37. Fixed base; 38. First fixing screw; 39. Filter tank; 40. Activated carbon block; 41. Chelating resin block; 42. Second flange; 43. Second fixing screw; 44. Fourth pump body; 45. Return pipe; 46. Injection pipe; 47. Filler block; 48. Filter plate. Detailed Implementation

[0023] The following detailed description provides further details on specific implementation methods.

[0024] like Figures 1 to 8As shown, this application provides a multi-stage purification treatment device for power plant exhaust gas, including a base plate 1, a filter box 2, a spray box 12, a sedimentation box 25, a disinfection box 34, a filter tank 38, and a water storage tank 16. A first pump body 9 is installed on the outer surface of the filter box 2. The input end of the first pump body 9 is connected to a suction pipe 10, which communicates with a suction nozzle 8. The output end of the first pump body 9 is connected to a collection box 11. A third pump body 23 is installed on the outer surface of the filter box 2. The output end of the third pump body 23 is connected to a connecting pipe 24, which connects to the sedimentation box 25. A storage box 27 is connected to the outer surface of the sedimentation box 25. A conveying module 28 is installed on the bottom surface of the storage box 27, extending into the interior of the sedimentation box 25. A second valve 29 is installed on the bottom surface of the sedimentation box 25, and a waste box 30 is located below the second valve 29. A drainage pipe 31 communicates with the outer surface of the sedimentation box 25, and a third valve 32 is installed on the outer surface of the drainage pipe 31. The end of the drainage pipe 31 away from the sedimentation tank 25 is connected to a first flange 33; the upper surface of the disinfection tank 34 is connected to a fixed base 36, and the upper surface of the fixed base 36 is connected to a filter tank 38, which is equipped with activated carbon blocks 39 and chelating resin blocks 40; the outer surface of the disinfection tank 34 is equipped with a fourth pump body 43, the output end of the fourth pump body 43 is connected to a return pipe 44, and the return pipe 44 is connected to a water storage tank 16; the upper surface of the water storage tank 16 is equipped with a second pump body 17, the output end of the second pump body 17 is connected to a water guide pipe 18, and the outer surface of the water guide pipe 18 is connected to two water supply pipes 19, the end of each water supply pipe 19 away from the water guide pipe 18 passes through the spray box 12 and is connected to the outer surface of the diversion plate 14.

[0025] like Figures 1-3 and Figure 6 As shown, a filter box 2 is installed on the upper surface of the base plate 1. A filter plate 47 is installed inside the filter box 2. A motor 3 is installed on the outer surface of the filter box 2. A threaded rod 4 is connected to the output end of the motor 3. A movable block 5 is screwed to the outer surface of the threaded rod 4. A positioning rod 6 is fixedly connected inside the filter box 2. A slider 7 is slidably installed on the outer surface of the positioning rod 6. A suction nozzle 8 is connected to the side of the movable block 5 and the slider 7 that are close to each other.

[0026] A first pump body 9 is installed on the outer surface of the filter box 2. The input end of the first pump body 9 is connected to a suction pipe 10. The end of the suction pipe 10 away from the first pump body 9 passes through the filter box 2 and is connected to the outer surface of the suction nozzle 8. The output end of the first pump body 9 is connected to a collection box 11.

[0027] like Figure 1 and Figure 7As shown, a spray box 12 is connected to the upper surface of the filter box 2. Two diversion plates 14 are installed inside the spray box 12, and multiple nozzles 15 are connected to the bottom surface of each diversion plate 14. Two filler blocks 46 are installed inside the spray box 12. A controller 13 is installed on the outer surface of the spray box 12, and an injection pipe 45 is connected to the outer surface of the spray box 12. A water storage tank 16 is installed on the upper surface of the base plate 1.

[0028] A second pump body 17 is installed on the upper surface of the water storage tank 16. The input end of the second pump body 17 passes through the water storage tank 16 and extends into the interior of the water storage tank 16. The output end of the second pump body 17 is connected to a water guide pipe 18. The outer surface of the water guide pipe 18 is connected to two water supply pipes 19. The end of each water supply pipe 19 away from the water guide pipe 18 passes through the spray box 12 and connects to the outer surface of the diversion plate 14. When the exhaust gas enters the spray box 12, the second pump body 17 draws washing liquid from the water storage tank 16 and distributes it to the two water supply pipes 19 through the water guide pipe 18. Finally, it is evenly sprayed by multiple nozzles 15 below the diversion plate 14. The spray liquid and the exhaust gas are in full contact in the spray box 12, absorbing soluble pollutants in the exhaust gas. The internal filling block 46 increases the gas-liquid contact area and residence time, improving the washing efficiency.

[0029] The outer surface of the spray box 12 is connected to the air guide pipe 20, and the outer surface of the air guide pipe 20 is equipped with a first valve 21. The preliminarily purified exhaust gas enters the purification module 22 through the air guide pipe 20 by opening the first valve 21. The end of the air guide pipe 20 away from the spray box 12 is connected to the purification module 22. The purification module 22 can use a low-temperature plasma purification device for filtration to finally meet the emission requirements.

[0030] like Figure 1 , Figure 3 , Figure 4 and Figure 8As shown, a third pump body 23 is installed on the outer surface of the filter box 2. The input end of the third pump body 23 passes through the filter box 2 and extends into the interior of the filter box 2. The output end of the third pump body 23 is connected to a connecting pipe 24. The end of the connecting pipe 24 away from the third pump body 23 is connected to a sedimentation tank 25. Multiple support columns 26 are connected to the outer surface of the sedimentation tank 25. The side of each support column 26 away from the sedimentation tank 25 is connected to the upper surface of the base plate 1. A storage tank 27 is connected to the outer surface of the sedimentation tank 25. A conveying module 28 is installed on the bottom surface of the storage tank 27. The end of the conveying module 28 away from the storage tank 27 passes through the sedimentation tank 25 and extends into the interior of the sedimentation tank 25. A second valve 29 is installed on the bottom surface of the sedimentation tank 25. A waste bin 30 is located below the second valve 29. A drain pipe 31 is connected to the outer surface of the sedimentation tank 25. The system is equipped with a third valve 32. A first flange 33 is installed at the end of the drain pipe 31 away from the sedimentation tank 25. A disinfection tank 34 is connected to the upper surface of the base plate 1. Two ultraviolet generating modules 35 are installed inside the disinfection tank 34. The ultraviolet generating modules 35 can be sleeve-type ultraviolet devices. A fixed base 36 is connected to the upper surface of the disinfection tank 34. Multiple first fixing screws 37 are connected to the upper surface of the fixed base 36. The end of each first fixing screw 37 near the fixed base 36 passes through the fixed base 36 and is connected to the screw inside the disinfection tank 34. A fourth pump body 43 is installed on the outer surface of the disinfection tank 34. The input end of the fourth pump body 43 passes through the disinfection tank 34 and extends into the interior of the disinfection tank 34. The output end of the fourth pump body 43 is connected to a return pipe 44. The end of the return pipe 44 away from the fourth pump body 43 is connected to the outer surface of the water storage tank 16.

[0031] like Figure 4 and Figure 8 As shown, the upper surface of the fixed base 36 is connected to the filter tank 38. Activated carbon blocks 39 and chelating resin blocks 40 are installed inside the filter tank 38. The outer surface of the filter tank 38 is connected to a second flange 41 through a metal pipe. Multiple second fixing screws 42 are threadedly connected to the inner walls of the second flange 41 and the first flange 33. Through the bolt connection structure between the first flange 33 and the second flange 41, the filter tank 38 can be quickly disassembled and replaced, improving the convenience of equipment maintenance and ensuring the continuous and efficient operation of the deep purification process.

[0032] Furthermore, based on the aforementioned multi-stage purification equipment for power plant exhaust gas, this application also provides a multi-stage purification method for power plant exhaust gas, such as... Figure 9 As shown, it includes the following steps: Step 1: Wastewater containing pollutants enters the filter box 2. The filter plate 47 inside initially intercepts large particles of dust and solid impurities in the wastewater. At the same time, the motor 3 is started, which drives the threaded rod 4 to rotate, causing the movable block 5 to move horizontally along the threaded rod 4. The slider 7 slides synchronously along the positioning rod 6, driving the suction nozzle 8 to reciprocate on the surface of the filter plate 47. The first pump body 9 pumps the dust and impurities collected by the suction nozzle 8 to the collection box 11 through the suction pipe 10, realizing online cleaning of the filter plate 47 and avoiding the accumulation of impurities that affect the filtration efficiency. Step 2: After preliminary filtration, the wastewater is pumped to the sedimentation tank 25 through the connecting pipe 24 by the third pump body 23. The storage tank 27 adds flocculant to the sedimentation tank 25 through the conveying module 28, so that the suspended particles, heavy metal ions and other substances in the wastewater form precipitates. After settling and stratification, the second valve 29 is opened to discharge the precipitates into the waste tank 30. The clear liquid in the upper layer is discharged through the diversion pipe 31 controlled by the third valve 32 and enters the filter tank 38. Step 3: The clean liquid entering the filter tank 38 is adsorbed by the activated carbon block 39 inside, and the chelating resin block 40 removes residual heavy metal ions. The treated cleaning waste liquid enters the disinfection tank 34. The wastewater is treated by ultraviolet irradiation generated by the ultraviolet generation module 35. Finally, the fourth pump body 43 pumps the cleaning waste liquid back to the water storage tank 16 through the return pipe 44 and reuses it as a spray washing liquid.

[0033] The working principle of this equipment is as follows: When wastewater containing pollutants enters the filter box 2, the internal filter plate 47 takes the lead in intercepting large particles of dust and solid impurities mixed in the wastewater, effectively reducing the load on subsequent processing modules. To prevent the filter plate 47 from becoming less efficient due to the accumulation of impurities, the controller 13 drives the motor 3 to rotate, causing the threaded rod 4 to rotate, making the movable block 5 move horizontally along the threaded rod 4. At the same time, the slider 7 slides synchronously along the positioning rod 6, ultimately realizing the reciprocating motion of the suction nozzle 8 on the surface of the filter plate 47. Combined with the suction action of the first pump body 9, the dust and impurities collected by the suction nozzle are transported to the collection box 11 through the suction pipe 10, completing the online cleaning of the filter plate 47. This design not only ensures the continuous high efficiency of the filtration process, but also indirectly enhances the protection of subsequent purification devices, reducing the wear and clogging of components such as spraying and sedimentation by impurities. The filtered wastewater still contains soluble pollutants and suspended particles. Driven by the third pump 23, it is pumped to the sedimentation tank 25 through the connecting pipe 24. At this time, the storage tank 27 accurately adds flocculants such as PAC and PAM into the sedimentation tank 25 through the conveying module 28. The flocculation reaction causes the suspended particles and heavy metal ions in the wastewater to agglomerate and form precipitates. After the precipitates settle and separate into layers in the sedimentation tank 25, the second valve 29 is opened, and the precipitates can be smoothly discharged into the waste tank 30 for centralized treatment. The clear liquid on the upper layer is discharged through the diversion pipe 31 controlled by the third valve 32 and enters the filter tank 38 for deep purification. Inside the filter tank 38, activated carbon blocks 39 adsorb odors and organic pollutants in the purified liquid through their porous structure, while chelating resin blocks 40 specifically remove residual heavy metal ions such as mercury and lead through chemical coordination, further improving water purity. The purified wastewater then enters the disinfection tank 34, where ultraviolet rays generated by two ultraviolet generating modules 35 penetrate the water and destroy the DNA structure of residual microorganisms and bacteria, achieving thorough harmless treatment. Finally, the disinfected wastewater is pumped back to the storage tank 16 through the return pipe 44 via the fourth pump 43 and reused as a spray washing liquid. This closed-loop design significantly reduces water consumption.

[0034] The above description is only a specific embodiment of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A multi-stage purification treatment apparatus for exhaust gas of a power plant having a base plate (1), characterized by, The bottom plate (1) is provided with a filter box (2) and a disinfection box (34), the filter box (2) is provided with a spray box (12), the spray box (12) is connected with a purification module (22), the filter box (2) is provided with a first pump body (9) and a third pump body (23), the first pump body (9) is connected with a collection box (11), the third pump body (23) is connected with a sedimentation tank (25), the sedimentation tank (25) is connected with a storage tank (27), the storage tank (27) is provided with a feeding module (28), the feeding module (28) extends into the sedimentation tank (25), the sedimentation tank (25) is provided with a waste tank (30), the disinfection box (34) is provided with a filter tank (38), the disinfection box (34) is provided with a fourth pump body (43), the fourth pump body (43) is connected with a return pipe (44), the return pipe (44) is connected with a water storage tank (16), the water storage tank (16) is provided with a second pump body (17), the second pump body (17) is connected with a water guide pipe (18), the water guide pipe (18) is connected with a water delivery pipe (19), the water delivery pipe (19) is connected with the spray box (12) and the outer surface of the flow distribution plate (14).

2. The multi-stage purification treatment apparatus for waste gas of a power plant according to claim 1, characterized by, The filter box (2) is provided with a filter plate (47), the filter box (2) is provided with a motor (3), a threaded rod (4), a movable block (5), a positioning rod (6), a sliding block (7) and a suction nozzle (8), the motor (3) drives the threaded rod (4) to rotate, so that the movable block (5) moves horizontally along the threaded rod (4), and cooperates with the sliding block (7) to slide synchronously along the positioning rod (6), so as to drive the suction nozzle (8) to reciprocate on the surface of the filter plate (47), and the input end of the first pump body (9) is connected with a suction pipe (10), and the suction pipe (10) is communicated with the suction nozzle (8).

3. The multi-stage purification treatment apparatus for power plant exhaust gas according to claim 1, characterized by, The spray box (12) is provided with a plurality of flow distribution plates (14), the bottom surface of each flow distribution plate (14) is communicated with a plurality of nozzles (15), the spray box (12) is provided with a filling block (46), the outer surface of the spray box (12) is communicated with an air guide pipe (20), the outer surface of the air guide pipe (20) is provided with a first valve (21), and the end, away from the spray box (12), of the air guide pipe (20) is communicated with the purification module (22).

4. The power plant exhaust gas multi-stage purification treatment apparatus according to claim 1, characterized by, The outer surface of the sedimentation tank (25) is connected with a plurality of supporting columns (26), and the side, away from the sedimentation tank (25), of each supporting column (26) is connected with the upper surface of the bottom plate (1).

5. The power plant flue gas multi-stage cleaning treatment apparatus according to claim 1, characterized by, The disinfection box (34) is provided with a fixed base (36), the filter tank (38) is arranged on the fixed base (36), the outer surface of the filter tank (38) is provided with a second flange (41) through a metal pipe, and the inner wall of the second flange (41) and the first flange (33) is screwed with a plurality of second fixing screws (42).

6. The power plant flue gas multistage cleaning treatment apparatus according to claim 1, characterized by, The filter tank (38) is provided with activated carbon blocks (39) and chelating resin blocks (40).

7. The power plant flue gas multistage cleaning treatment apparatus according to claim 1, characterized by, The output end of the third pump body (23) is connected with a connecting pipe (24), the connecting pipe (24) is connected with the sediment tank (25), the outer surface of the sediment tank (25) is communicated with a drainage pipe (31), the outer surface of the drainage pipe (31) is mounted with a third valve (32), and the end, away from the sediment tank (25), of the drainage pipe (31) is connected with a first flange (33).

8. The power plant flue gas multistage cleaning treatment apparatus according to claim 1, characterized by, The bottom surface of the sediment tank (25) is mounted with a second valve (29), and the lower portion of the second valve (29) is provided with a waste tank (30).

9. The power plant flue gas multistage cleaning treatment apparatus according to claim 1, characterized by, The outer surface of the filter tank (2) is mounted with a controller (13) and an injection pipe (45).

10. A method for multi-stage purification of power plant exhaust gas, characterized by, The device is adopted, and the device comprises: Step 1: waste water enters the filter tank (2), the filter plate (47) intercepts large-particle impurities, the motor (3) drives the suction nozzle (8) to reciprocate on the surface of the filter plate (47), and the first pump body (9) sends dust to the collection tank (11); Step 2: waste water is sent into the sediment tank (25) through the third pump body (23), the storage tank (27) throws flocculating agent to make suspended matters to be deposited, the second valve (29) discharges the sediment to the waste tank (30), and the upper clear liquid enters the filter tank (38) through the drainage pipe (31); Step 3: the clear liquid is adsorbed and treated through the activated carbon block (39) and the chelating resin block (40), after being disinfected through the disinfection tank (34), the fourth pump body (43) returns the clean liquid to the water storage tank (16) for recycling.

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