Filtering and circulating device with leakproof performance for water pollution control

Abstract

The invention provides a filtering and circulating device with leakproof performance for water pollution control, and relates to the technical field of sewage treatment. Rail plates are fixed to the inner walls of the front end and the rear end of the pretreatment box, a mounting frame capable of sliding up and down is mounted between the two rail plates, a pre-filtering net is fixedly mounted on the mounting frame, a baffle is fixed in the pretreatment box and located on the right side of the pre-filtering net, and the joint of the baffle and the inner wall of the pretreatment box is subjected to welding sealing treatment; a reflux inlet is formed in the front side of the pretreatment box; the pre-filtering net in the pretreatment box intercepts large-particle impurities, the baffle forms an independent precipitation area, sinking impurities are blocked and settled, the follow-up filtering load is relieved, and the service life of parts is prolonged; the multi-stage filtration in the filtering tank ensures that clear water reaches the standard, the differential pressure gauge ensures that the filtering efficiency is stable, meanwhile, the resource utilization rate and the operation convenience are improved, and a blow-off pipe can send sewage which does not reach the standard back to the pretreatment box for secondary treatment through a backflow pipe.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a filtration and circulation device with leak-proof performance for water pollution control. Background Technology

[0002] With the accelerating pace of industrialization and urbanization, the amount of wastewater discharged from various production and daily life activities continues to increase, and water pollution has become an increasingly prominent concern. Once water bodies are polluted, they not only affect the balance of the ecological environment and threaten the survival of aquatic organisms, but may also pose potential harm to human health through the food chain. Therefore, effective wastewater treatment has become a crucial aspect of environmental protection. In the process of water pollution control, filtration and circulation devices, as key equipment, can remove impurities and pollutants from wastewater through physical filtration and chemical treatment, improving water quality and enabling the recycling of water resources or achieving compliant discharge. These devices are widely used in various fields such as industrial wastewater treatment, domestic sewage treatment, and agricultural non-point source pollution control, providing important technical support for alleviating water shortages and protecting the water environment. This invention is a leak-proof filtration and circulation device for water pollution control.

[0003] Existing filtration structures often fail to form a complete multi-stage filtration system, resulting in limited deep purification effects on wastewater and difficulty in ensuring that discharged clean water consistently meets standards. Summary of the Invention

[0004] This invention relates to a filtration and circulation device with leak-proof performance for water pollution treatment, in order to solve the technical problems mentioned in the background art.

[0005] In a first aspect, this invention provides a leak-proof filtration and circulation device for water pollution treatment, specifically comprising: a pretreatment tank; rail plates are fixed to the inner walls of both the front and rear ends of the pretreatment tank, a sliding mounting frame is installed between the two rail plates, a pre-filter screen is fixedly installed on the mounting frame, and a baffle is fixed inside the pretreatment tank, the baffle being located to the right of the pre-filter screen, the connection between the baffle and the inner wall of the pretreatment tank being sealed by welding, a return port is provided on the front side of the pretreatment tank, and a filter tank is provided on the right side of the pretreatment tank, with the filter tank having a lower... Two support frames are fixedly installed at the end. A fine filter screen is fixedly installed inside the filter tank, and a filter element assembly is installed inside the filter tank. A silicone sealing ring is provided at the connection between the filter element assembly and the filter tank. A backwash pipe is provided at the upper end of the filter tank, and a first drain pipe and a second drain pipe are provided at the lower end of the filter tank. A first control valve and a second control valve are respectively connected to the first drain pipe and the second control valve. A sewage return pipe is connected to the first control valve and the second control valve. The sewage return pipe is connected to the return port on the pretreatment tank. The return port is located to the left of the pre-filter screen.

[0006] Furthermore, the pretreatment box is equipped with two wastewater discharge pipes, which are located on the left side of the pre-filter and between the pre-filter and the baffle, respectively.

[0007] Furthermore, a water inlet assembly is provided on the left side of the pretreatment tank. The water inlet assembly includes a bottom mounting bracket, a water inlet pump, a first motor, a sewage inlet pipe, and a sewage outlet pipe. The bottom mounting bracket is located on the left side of the pretreatment tank. The water inlet pump and the first motor are bolted to the bottom mounting bracket. Pulleys are installed on the shaft of the water inlet pump and the output shaft of the first motor. A belt connects the two pulleys. The sewage inlet pipe and the sewage outlet pipe are respectively connected to the inlet and outlet of the water inlet pump. A water inlet connecting pipe is provided on the left side of the pretreatment tank, and the sewage outlet pipe is connected to the water inlet connecting pipe.

[0008] Furthermore, the upper end of the pretreatment box is fitted with a top cover via a hinge, the front end of the top cover is fitted with a hook plate via screws, and the front end of the pretreatment box is fitted with a mounting base via screws. A handle is hinged to the mounting base, a rotatable rotating column is fitted on the handle, and a pull rod is fitted on the rotating column via a nut. The upper end of the pull rod is hooked onto the hook plate.

[0009] Furthermore, a base is fixedly installed on the top cover, a transmission seat is installed on the base, a second motor is installed on the transmission seat, a base plate is installed on the upper end of the base by bolts, and a material cylinder is fixedly installed on the base plate.

[0010] Furthermore, a rotatable rotating disk is installed inside the material cylinder. The rotating disk is fixedly mounted on the output shaft of the transmission seat, and semi-circular grooves are arranged in an annular array on the rotating disk. A discharge port is provided on the bottom plate, and a discharge pipe is installed on the base. The discharge port is located directly above the discharge pipe, and the lower end of the discharge pipe is connected to the pretreatment box.

[0011] Furthermore, a water pump and a third motor are installed between the pretreatment tank and the filter tank. Both the output shaft of the third motor and the rotating shaft of the water pump are equipped with pulleys, which are connected by a belt. A water pumping pipe is installed on the right side of the pretreatment tank, and the water pump inlet is connected to the water pumping pipe. A sewage inlet is installed on the left side of the filter tank, and the water pump outlet is connected to the sewage inlet. A third control valve is installed on the water pump outlet.

[0012] Furthermore, an end cap is threaded onto the right side of the filter tank, and a knob is fixedly installed on the end cap.

[0013] Furthermore, the filter tank is equipped with a differential pressure gauge for detecting the pressure difference between the left and right sides of the filter core assembly, and a pressure gauge for detecting the outlet water pressure is also installed on the filter tank.

[0014] Furthermore, the filter tank is equipped with a clean water discharge pipe, and a fourth control valve is installed on the clean water discharge pipe.

[0015] This invention provides a leak-proof filtration and circulation device for water pollution treatment, which has the following beneficial effects: This invention improves the quality of water pollution treatment. The pre-filter in the pretreatment tank can first intercept large particulate impurities in the sewage. The baffle is fixed by welding to the inner wall of the pretreatment tank, forming an independent sedimentation area on the right side of the pre-filter. This effectively blocks sedimentation impurities (such as silt, heavy metal precipitates, etc.) in the sewage. After the sewage is initially filtered by the pre-filter, the water flow speed is slowed down by the baffle. Sedimentation impurities can naturally settle to the bottom of the pretreatment tank under gravity, preventing them from entering the subsequent filter tank with the water flow. This significantly reduces the filtration load on the fine filter and filter cartridge, extends the service life of the core filter components, and reduces the pressure on subsequent filters. The fine filter and filter cartridge in the filter tank form a multi-stage filtration system that can deeply purify sewage and ensure that the discharged clean water meets the standards. At the same time, the differential pressure gauge can monitor the pressure difference on both sides of the filter cartridge in real time, making it easy to understand the blockage of the filter cartridge and ensure stable filtration efficiency.

[0016] Furthermore, this invention improves resource utilization and ease of operation. The first and second sewage pipes are connected to the return port of the pretreatment tank through a sewage return pipe, allowing substandard sewage to be reintroduced into the pretreatment tank for secondary treatment, thus avoiding water waste. The two wastewater discharge pipes are located on the left side of the pre-filter and between the pre-filter and the baffle, respectively, allowing for flexible discharge of sewage at different stages according to the pretreatment situation, making the operation more targeted.

[0017] Furthermore, in this invention, when the fine filter screen and filter element assembly inside the filter tank become clogged, resulting in a decrease in filtration efficiency, a backwashing operation can be performed through the backwash pipe. During backwashing, the fourth control valve on the clean water discharge pipe and the third control valve at the outlet of the water pump are closed, and backwash water is introduced through the backwash pipe. The backwash water flows in the reverse direction through the filter element assembly and fine filter screen, flushing off the impurities attached to them. The wastewater generated during flushing can be discharged through the first and second drain pipes. The backwashing process can effectively remove the blockages on the filter components, restore their filtration performance, eliminate the need for frequent disassembly and replacement, reduce maintenance costs, extend the service life of the filter components, and ensure the long-term stable filtration effect of the device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0019] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0020] In the attached diagram: Figure 1A schematic diagram of the overall structure of the present invention is shown.

[0021] Figure 2 A schematic diagram of the water inlet assembly of the present invention is shown.

[0022] Figure 3 A schematic diagram of the pretreatment box section of the present invention is shown.

[0023] Figure 4 A schematic diagram of the mounting frame portion of the present invention is shown.

[0024] Figure 5 The present invention is shown Figure 1 A magnified structural diagram of part A in the middle.

[0025] Figure 6 A schematic diagram of the base portion of the present invention is shown.

[0026] Figure 7 A schematic diagram of the rotating disk portion of the present invention is shown.

[0027] Figure 8 A cross-sectional view of the filter tank of the present invention is shown.

[0028] Figure 9 A schematic diagram of the rear side of the filter tank of the present invention is shown.

[0029] Figure 10 A schematic diagram of the filter core assembly of the present invention is shown.

[0030] List of reference numerals 1. Pretreatment tank; 11. Inlet assembly; 111. Bottom mounting bracket; 112. Inlet pump; 113. First motor; 114. Sewage inlet pipe; 115. Sewage outlet pipe; 12. Inlet connection pipe; 13. Rail plate; 131. Mounting frame; 1311. Pre-filter; 14. Baffle; 15. Pumping pipe; 16. Wastewater discharge pipe; 17. Water pump; 171. Third motor; 172. Third control valve; 18. Top cover; 181. Hook plate; 182. Mounting base; 1821. Handle; 1822. Rotating column; 1823. Pull rod; 2. Base; 21. 211. Transmission base; 22. Second motor; 23. Feed pipe; 24. Base plate; 231. Material cylinder; 232. Rotating disc; 233. Feed port; 35. Filter tank; 36. Support frame; 37. Sewage inlet; 38. Fine filter screen; 39. Filter core assembly; 30. End cap; 30. Knob; 31. First drain pipe; 32. First control valve; 33. Second drain pipe; 34. Second control valve; 35. Sewage return pipe; 36. Return port; 37. Clean water discharge pipe; 38. Fourth control valve; 39. Backwash pipe; 39. Differential pressure gauge; 39. Pressure gauge. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please refer to Figures 1 to 10 Example 1: This invention proposes a leak-proof filtration and circulation device for water pollution treatment, comprising: a pretreatment tank 1; rail plates 13 are fixed on the inner walls of both the front and rear ends of the pretreatment tank 1, and a sliding mounting frame 131 is installed between the two rail plates 13. A pre-filter screen 1311 is fixedly installed on the mounting frame 131, and a baffle 14 is fixed inside the pretreatment tank 1, located to the right of the pre-filter screen 1311. The connection between the baffle 14 and the inner wall of the pretreatment tank 1 is sealed by welding. A return port 3721 is provided on the front side of the pretreatment tank 1, and a filter tank 3 is provided on the right side of the pretreatment tank 1. Two support frames 31 are fixedly installed at the lower end of the filter tank 3. A fine filter screen 33 is fixedly installed inside the filter tank 3, and a filter element assembly 34 is installed inside the filter tank 3. A silicone sealing ring is provided at the connection between the filter element assembly 34 and the filter tank 3. A backwash pipe 39 is provided at the upper end of the filter tank 3, and a first drain pipe 36 and a second drain pipe 37 are provided at the lower end of the filter tank 3. A first control valve 361 and a second control valve 371 are respectively connected to the first drain pipe 36 and the second drain pipe 37. A sewage return pipe 372 is connected to the first control valve 361 and the second control valve 371. The sewage return pipe 372 is connected to the return port 3721 on the pretreatment tank 1. The return port 3721 is located to the left of the pre-filter screen 1311.

[0033] In this embodiment of the invention, two wastewater discharge pipes 16 are installed on the pretreatment tank 1. The two wastewater discharge pipes 16 are located on the left side of the pre-filter 1311 and between the pre-filter 1311 and the baffle 14, respectively. Their functions are: the wastewater discharge pipe 16 on the left side can discharge the sewage that has not been filtered by the pre-filter 1311 in a timely manner, and the wastewater discharge pipe 16 on the right side can specifically discharge the impurities that have been filtered by the pre-filter 1311 and have been settled by the baffle 14.

[0034] In this embodiment of the invention, a water inlet assembly 11 is provided on the left side of the pretreatment tank 1. The water inlet assembly 11 includes a bottom mounting bracket 111, a water inlet pump 112, a first motor 113, a sewage inlet pipe 114, and a sewage outlet pipe 115. The bottom mounting bracket 111 is located on the left side of the pretreatment tank 1. The water inlet pump 112 and the first motor 113 are bolted to the bottom mounting bracket 111. Pulleys are mounted on the shaft of the water inlet pump 112 and the output shaft of the first motor 113. A belt is connected between the two. The sewage inlet pipe 114 and the sewage outlet pipe 115 are connected to the inlet and outlet of the water pump 112, respectively. An inlet connection pipe 12 is set on the left side of the pretreatment tank 1. The sewage outlet pipe 115 is connected to the inlet connection pipe 12. Its function is: the sewage inlet pipe 114 is responsible for introducing the sewage to be treated into the water pump 112. After being pressurized by the water pump 112, the sewage outlet pipe 115 transports the sewage into the pretreatment tank 1 through the inlet connection pipe 12, so as to realize the orderly introduction of sewage.

[0035] In this embodiment of the invention, a top cover 18 is installed on the upper end of the pretreatment box 1 via a hinge. A hook plate 181 is installed on the front end of the top cover 18 via screws, and a mounting base 182 is installed on the front end of the pretreatment box 1 via screws. A handle 1821 is hinged to the mounting base 182, and a rotatable rotating column 1822 is installed on the handle 1821. A pull rod 1823 is installed on the rotating column 1822 via a nut. The upper end of the pull rod 1823 is hooked onto the hook plate 181. Its function is to enable the pull rod 1823 to tighten or loosen the hook plate 181 by turning the handle 1821, thereby realizing the convenient opening and closing and stable closure of the top cover 18. This allows the operator to open the top cover 18 to clean or replace the pre-filter 1311 inside the pretreatment box 1, or to clean up the precipitated impurities and perform other maintenance operations.

[0036] In this embodiment of the invention, a base 2 is fixedly installed on the top cover 18, a transmission seat 21 is installed on the base 2, and a second motor 211 is installed on the transmission seat 21. A base plate 23 is bolted to the upper end of the base 2, and a material cylinder 231 is fixedly installed on the base plate 23. A rotatable rotating disk 232 is installed inside the material cylinder 231. The rotating disk 232 is fixedly installed on the output shaft of the transmission seat 21, and a semi-circular groove is arranged in a ring on the rotating disk 232. A discharge port 233 is provided on the base plate 23, and a discharge pipe 22 is installed on the base 2. The discharge port 233 is located directly above the discharge pipe 22, and the lower end of the discharge pipe 22 is connected to the pretreatment box 1. The function of the device is as follows: When the second motor 211 is working, it drives the rotating disk 232 inside the material cylinder 231 to rotate through the output shaft of the transmission base 21. The material cylinder 231 is used to store sewage treatment agent. When the annular array semi-circular groove on the rotating disk 232 rotates with the rotating disk 232, it can quantitatively carry the sewage treatment agent in the material cylinder 231 to the discharge port 233 of the bottom plate 23. Then, the sewage treatment agent falls into the discharge pipe 22 on the base 2 through the discharge port 233, and is then transported to the pretreatment tank 1 through the lower end of the discharge pipe 22. This realizes the quantitative and stable addition of sewage treatment agent, so as to enhance the sewage pretreatment effect and assist in the removal of pollutants in the sewage.

[0037] In Example 2, based on Example 1, a water pump 17 and a third motor 171 are installed between the pretreatment tank 1 and the filter tank 3. Both the output shaft of the third motor 171 and the rotating shaft of the water pump 17 are equipped with pulleys, which are connected by a belt. A pumping pipe 15 is installed on the right side of the pretreatment tank 1, and the inlet of the water pump 17 is connected to the pumping pipe 15. A sewage inlet 32 ​​is installed on the left side of the filter tank 3, and the outlet of the water pump 17 is connected to the sewage inlet 32. A third control valve 172 is installed on the outlet of the water pump 17. Its function is to allow the pretreated sewage in the pretreatment tank 1 to be pumped out through the pumping pipe 15 on the right side of the pretreatment tank 1, and then its outlet is connected to the sewage inlet 32 ​​on the left side of the filter tank 3 to transport the sewage into the filter tank 3 for deep filtration.

[0038] In Example 3, based on Examples 1 and 2, an end cap 35 is threaded onto the right side of the filter tank 3, and a knob 351 is fixedly installed on the end cap 35. A differential pressure gauge 391 for detecting the pressure difference between the left and right sides of the filter element assembly 34 is installed on the filter tank 3, and a pressure gauge 392 for detecting the outlet water pressure is also installed on the filter tank 3. A clean water discharge pipe 38 is provided on the filter tank 3, and a fourth control valve 381 is installed on the clean water discharge pipe 38. Its function is to allow the operator to easily rotate the knob 351 by threading the end cap 35 on the right side of the filter tank 3. The end cap 35 can be quickly removed and installed, making it convenient to replace or maintain the filter element assembly 34 inside the filter tank 3; the differential pressure gauge 391 installed on the filter tank 3 can detect the pressure difference between the left and right sides of the filter element assembly 34 in real time, thereby judging the degree of blockage of the filter element assembly 34, so as to facilitate timely cleaning or replacement; the pressure gauge 392 on the filter tank 3 can monitor the outlet water pressure to ensure the stable operating pressure of the filtration system; the clean water discharge pipe 38 on the filter tank 3 is used to discharge the deep-filtered clean water, and the fourth control valve 381 installed on it can control the opening and closing of the clean water discharge and the discharge volume, ensuring that the qualified clean water is discharged as needed.

[0039] The working principle of this invention is as follows: The first motor 113 drives the inlet pump 112 through a pulley and belt. The wastewater to be treated enters the inlet pump 112 through the wastewater inlet pipe 114, and is then transported to the pretreatment tank 1 through the inlet connection pipe 12 via the wastewater outlet pipe 115. The wastewater entering the pretreatment tank 1 first passes through the pre-filter 1311, where large particles are intercepted. Subsequently, the water flow is slowed down by the baffle 14, and sinking impurities settle under gravity. At the same time, the addition structure on the top cover 18 can drive the rotating disk 232 to rotate through the second motor 211, quantitatively adding the wastewater treatment agent in the material cylinder 231 to the pretreatment tank 1 through the discharge port 233 and the discharge pipe 22, enhancing the pretreatment effect. The pretreated wastewater is drawn out by the water pump 17 through the pumping pipe 15 and, driven by the third motor 171, enters the filter tank 3 through the wastewater inlet 32, and then passes through the filter tank 3 in sequence. The filter undergoes deep filtration through a fine filter screen 33 and a filter cartridge assembly 34. The filtered clean water is discharged through the clean water discharge pipe 38 under the control of the fourth control valve 381. The differential pressure gauge 391 and pressure gauge 392 on the filter tank 3 monitor the pressure difference and outlet pressure on both sides of the filter cartridge assembly 34, respectively, to understand the filtration status in a timely manner. When backwashing is required, backwash water is introduced through the backwash pipe 39. The impurities washed off are discharged through the first drain pipe 36 and the second drain pipe 37. Wastewater that does not meet the standards can also be returned to the pretreatment tank 1 for reprocessing through the wastewater return pipe 372. In addition, the operator can open the top cover 18 through the handle 1821 and other structures to maintain the pre-filter screen 1311, and replace the filter cartridge assembly 34 by removing and installing the end cover 35 through the knob 351. The two wastewater discharge pipes 16 can discharge wastewater at different stages as needed, ensuring the stable and efficient operation of the entire device.

[0040] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0041] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0042] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention 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 the present invention should be included within the scope of protection of the present invention.

Claims

1. A leak-proof filtration and circulation device for water pollution treatment, comprising: A pretreatment box; characterized in that rail plates are fixed on the inner walls of both the front and rear ends of the pretreatment box, and a sliding mounting frame is installed between the two rail plates. A pre-filter screen is fixedly installed on the mounting frame, and a baffle is fixed inside the pretreatment box. The baffle is located on the right side of the pre-filter screen, and the connection between the baffle and the inner wall of the pretreatment box is sealed by welding. A return port is provided on the front side of the pretreatment box, and a filter tank is provided on the right side of the pretreatment box. Two support frames are fixedly installed at the lower end of the filter tank. A fine filter screen is fixedly installed inside the filter tank, and a filter element assembly is installed inside the filter tank. A silicone sealing ring is provided at the connection between the filter element assembly and the filter tank. A backwash pipe is provided at the upper end of the filter tank, and a first drain pipe and a second drain pipe are provided at the lower end of the filter tank. A first control valve and a second control valve are respectively connected to the first drain pipe and the second drain pipe. A sewage return pipe is connected to the first control valve and the second control valve. The sewage return pipe is connected to the return port on the pretreatment box, and the return port is located on the left side of the pre-filter screen.

2. A filtration and circulation device with leak-proof performance for water pollution treatment according to claim 1, characterized in that, The pretreatment tank is equipped with two wastewater discharge pipes, which are located on the left side of the pre-filter and between the pre-filter and the baffle, respectively.

3. A filtration and circulation device with leak-proof performance for water pollution treatment according to claim 2, characterized in that, The pretreatment tank has an inlet assembly on its left side, which includes a bottom mounting bracket, an inlet pump, a first motor, a sewage inlet pipe, and a sewage outlet pipe. The bottom mounting bracket is located on the left side of the pretreatment tank. The inlet pump and the first motor are bolted to the bottom mounting bracket. Both the shaft of the inlet pump and the output shaft of the first motor are equipped with pulleys, and a belt connects the two pulleys. The sewage inlet pipe and the sewage outlet pipe are connected to the inlet and outlet of the inlet pump, respectively. An inlet connecting pipe is provided on the left side of the pretreatment tank, and the sewage outlet pipe is connected to the inlet connecting pipe.

4. A water pollution treatment filter circulation device with leak-proof performance according to claim 3, characterized in that, The pretreatment box has a top cover installed on its upper end via a hinge. A hook plate is installed on the front end of the top cover via screws. A mounting base is installed on the front end of the pretreatment box via screws. A handle is hinged to the mounting base. A rotatable rotating column is installed on the handle. A pull rod is installed on the rotating column via a nut. The upper end of the pull rod is hooked onto the hook plate.

5. A filtration and circulation device with leak-proof performance for water pollution treatment according to claim 4, characterized in that, A base is fixedly installed on the top cover, a transmission seat is installed on the base, a second motor is installed on the transmission seat, and a base plate is installed on the upper end of the base by bolts, and a material cylinder is fixedly installed on the base plate.

6. A filtration and circulation device with leak-proof performance for water pollution treatment according to claim 5, characterized in that, The material cylinder is equipped with a rotatable rotating disk, which is fixedly mounted on the output shaft of the transmission seat. The rotating disk has a semi-circular array of grooves in a ring. The bottom plate is provided with a discharge port, and a discharge pipe is installed on the base. The discharge port is located directly above the discharge pipe, and the lower end of the discharge pipe is connected to the pretreatment box.

7. A filtration and circulation device with leak-proof performance for water pollution treatment according to claim 6, characterized in that, A water pump and a third motor are installed between the pretreatment tank and the filter tank. Both the output shaft of the third motor and the rotating shaft of the water pump are equipped with pulleys, which are connected by a belt. A water pumping pipe is installed on the right side of the pretreatment tank, and the water pump inlet is connected to the water pumping pipe. A sewage inlet is installed on the left side of the filter tank, and the water pump outlet is connected to the sewage inlet. A third control valve is installed on the water pump outlet.

8. A filtration and circulation device with leak-proof performance for water pollution treatment according to claim 7, characterized in that, The filter tank is threaded to the right side with an end cap, and a knob is fixedly installed on the end cap.

9. A filtration and circulation device with leak-proof performance for water pollution treatment according to claim 8, characterized in that, The filter tank is equipped with a differential pressure gauge for detecting the pressure difference between the left and right sides of the filter core assembly, and a pressure gauge for detecting the outlet water pressure.

10. A filter circulation device with leak-proof performance for water pollution treatment according to claim 9, characterized in that, The filter tank is equipped with a clean water discharge pipe, and a fourth control valve is installed on the clean water discharge pipe.

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