Circulating type water filtering and purifying device

By designing a circulating water filtration purification device, the combination of an oblique filter and a debris support inclined plate is solved, and the problem of debris affecting the purification effect in traditional sewage treatment is achieved, efficient filtration and reuse of sewage is achieved, water resources are saved and production costs are reduced.

CN222765801UActive Publication Date: 2025-04-18CHONGQING AOSIDE INSTR EQUIP CO LTD
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Patent Information

Application Number
CN202421639608.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-11
Publication Date
2025-04-18
Estimated Expiration
2034-07-11

AI Technical Summary

Technical Problem

In traditional sewage treatment, sewage contains a large amount of debris, which affects the effect of the purifier, leads to poor purification effect and affects the re-use of purified water.

Method used

A circulating water filtration purification device is designed, including a sewage treatment tank, a debris collection tank, an oblique filter, a debris support inclined plate, a water filter piece and a purifier feeding system. The device realizes the filtration of sewage and the guidance and aggregation of debris through the combination of an oblique filter and debris support plate, and further removes impurities through the water filter to improve the reuse rate of sewage.

Benefits of technology

The reuse rate of sewage recycling and treatment is improved, and the sewage can be recycled through purification and filtration treatment, which solves the problem that debris in traditional sewage treatment affects the purification effect, saves water resources and reduces production costs.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model relates to the technical field of sewage treatment, and particularly discloses a circulating type water filtration and purification device which comprises a sewage treatment tank and a sundry collection tank, a sewage transfer pipe is connected between the sewage treatment tank and an industrial drainage pipe, an inclined filter screen is arranged on the inner side of the sewage treatment tank, and a sewage purification piece is arranged at the inner bottom of the sewage treatment tank. A sundry supporting inclined plate is arranged on the inner side of the sundry collecting pool, the top end of the sundry supporting inclined plate is connected with the bottom end of the inclined filter screen in a connected mode, a water filtering piece is arranged at the bottom end of the sundry supporting inclined plate, and a water filtering and purifying assembly located below the sundry supporting inclined plate is arranged at the inner bottom of the sundry collecting pool. The bottom of the sewage treatment tank is provided with a drainage piece used for draining water in the sewage treatment tank and the impurity collection tank, so that the problems that in traditional sewage treatment, a large number of impurities are contained in sewage, the action effect of a purifying agent is influenced, the purifying effect is poor, and the reuse of purified water is influenced are solved.
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Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and specifically discloses a circulating water filtering and purification device. Background Art

[0002] In the process of industrial production, the demand for industrial water is large, and water is usually supplied to industrial production lines from industrial production water tanks, so the amount of industrial wastewater produced has also increased dramatically. Industrial wastewater often contains a large amount of industrial sludge, which contains industrial raw materials and products that are harmful to the environment. Therefore, achieving sewage purification is of great significance to environmental protection.

[0003] Traditionally, industrial wastewater is discharged through industrial drainage pipes for purification. The purified water obtained after purification can be reused in industrial production. However, traditional industrial wastewater contains a large proportion of impurities. If a purifier is used directly to purify the wastewater containing a large amount of impurities during purification, it will affect the effect of the purifier, resulting in a waste of purifiers, poor purification effect, and affect the reuse of purified water. It is not only time-consuming, but also very resource-consuming, delaying industrial production time and greatly increasing the production cost of the enterprise. Therefore, in view of this, the inventor provides a circulating water filtration and purification device to solve the above problems. Utility Model Content

[0004] The utility model aims to solve the problem that in traditional sewage treatment, sewage contains a lot of debris, which affects the effect of the purifier, resulting in poor purification effect and affecting the reuse of purified water.

[0005] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a circulating water filtering and purification device, including a sewage treatment tank connected to an industrial drainage pipe and a debris collection tank connected to one side of the sewage treatment tank, a sewage transfer pipe is connected between the sewage treatment tank and the industrial drainage pipe, an oblique filter screen is provided on the inner side of the sewage treatment tank and is located below the sewage transfer pipe, a sewage purification component is provided on the inner bottom of the sewage treatment tank and is located below the oblique filter screen and is used to purify the sewage, a debris support inclined plate is provided on the inner side of the debris collection tank and is arranged in parallel and collinear with the oblique filter screen, the top end of the debris support inclined plate is connected to the bottom end of the oblique filter screen, a water filter component is provided at the bottom end of the debris support inclined plate for filtering the sewage from the debris in the debris collection tank, a water filter purification component is provided on the inner bottom of the debris collection tank and is located below the debris support inclined plate, and a drainage component is provided at the bottom of the sewage treatment tank for discharging water from the sewage treatment tank and the debris collection tank.

[0006] The principles and effects of this basic solution are:

[0007] 1. Compared with the prior art, the utility model not only realizes the filtration and impurity removal of sewage, but also facilitates the guidance and aggregation of impurities by arranging an oblique filter screen and an impurity support inclined plate. By arranging a water filter, it is convenient to further remove impurities and filter the impurities in the impurity collection pool, thereby improving the reuse rate of sewage recycling treatment. The discharged sewage is purified and filtered through the sewage treatment pool, and the purified water is reused, which saves a lot of water resources and enables the sewage to be recycled. It solves the problem that the traditional sewage treatment contains a lot of impurities, which affects the effect of the purifier, resulting in poor purification effect and affecting the reuse of purified water.

[0008] Furthermore, the drainage component includes a first water outlet pipe provided at one end of the bottom of the sewage treatment tank near the debris collection tank, a second water outlet pipe provided at one end of the bottom of the debris collection tank near the sewage treatment tank, a main water outlet pipe connected between the first water outlet pipe and the second water outlet pipe, and a water outlet regulating valve for regulating the on-off of the first water outlet pipe and the second water outlet pipe, and the main water outlet pipe is also connected to the industrial production water tank. By providing the first water outlet pipe and the second water outlet pipe, it is convenient to discharge the sewage in the sewage treatment tank and the debris collection tank respectively, and by providing the water outlet regulating valve, it is convenient to control and regulate the on-off of the drainage of the first water outlet pipe and the second water outlet pipe.

[0009] Furthermore, the water filter comprises a debris water filter net disposed between the bottom end of the debris support inclined plate and the inner wall of one side of the debris collection tank, an insertion groove disposed transversely in the middle of the side of the debris water filter net away from the sewage treatment tank, and a plugging plate that can slide in the insertion groove and is used to block the debris water filter net, the plugging plate is also slidably connected to the side wall of the debris collection tank, and a push-pull rod is also provided at one end of the plugging plate away from the sewage treatment tank. By providing the debris water filter net, it is convenient to further filter the debris in the debris collection tank and collected on the debris support inclined plate, and by providing the insertion groove and the plugging plate, it is convenient to adjust and control the debris water filter net used to connect the upper space and the lower space of the debris support inclined plate, which is convenient for sealing the space when purifying the sewage filtered below the debris support inclined plate, and can also prevent the sewage below the debris support inclined plate from flowing back into the debris above the debris support inclined plate.

[0010] Furthermore, the sewage purification component includes a first feeding pipe arranged at the top of one side of the sewage treatment tank and below the oblique filter screen, and a first feeding valve installed on the first feeding pipe. By setting the first feeding pipe, it is convenient to add a purifier to the sewage treatment tank, thereby purifying the sewage in the sewage treatment tank, and facilitating the sewage treatment and purification and then reusing it for recycling in industrial production and processing.

[0011] Furthermore, the outlet regulating valve includes a first outlet valve provided on the first outlet pipe and a second outlet valve provided on the second outlet pipe, the water filtration and purification component is a feeding member provided in the plugging plug and used to add a purifier to the bottom of the debris collection pool, the feeding member includes a second feeding pipe provided on one side of the plugging plug and a second feeding valve provided on the second feeding pipe, and a feeding trough connected between the second feeding pipe and the bottom of the debris collection pool is provided at the bottom of the plugging plug. By respectively providing the first outlet valve and the second outlet valve on the first outlet pipe and the second outlet pipe, it is convenient to separately adjust and control the drainage functions of the first outlet pipe of the sewage treatment pool and the second outlet pipe of the debris collection pool, and by installing the second feeding pipe and the second feeding valve in the plugging plug, it is convenient to separately purify the sewage obtained by filtering the debris at the bottom of the debris collection pool, so that the filtering, purification and discharge of the sewage in the sewage treatment pool and the debris collection pool are performed separately without affecting each other, thereby improving the efficiency and quality of the overall sewage treatment.

[0012] Furthermore, the outlet regulating valve is a main outlet valve that can be detachably mounted on the outlet main pipe, and the water filtration and purification component is a first outlet pipe and a second outlet pipe for diffusing the purifier in the sewage treatment tank to the debris collection tank. By arranging the outlet main valve on the outlet main pipe, the on-off regulation of the first outlet pipe and the second outlet pipe is realized, which is convenient for the unified discharge of purified water obtained after the sewage in the first outlet pipe and the second outlet pipe is purified, so that the overall structure is more convenient to control and the operation is simpler, and at the same time, the debris collection tank and the sewage treatment tank are in a connected state, so that the sewage purification component can purify the sewage in the sewage treatment tank and the debris collection tank at the same time.

[0013] Furthermore, one end of the oblique filter is connected to the end of the inner top of the sewage treatment tank away from the debris collection tank, and the other end of the oblique filter is connected to the debris support inclined plate. The sewage transfer pipe is installed in the middle of the top of the sewage treatment tank, and the oblique filter is provided with a vertical filter connected to the bottom end of the sewage transfer pipe. By setting the vertical filter, it is not only convenient to filter the sewage, but also the vertical filter and the oblique filter are used to separate and filter the sewage and debris, and blockage on the oblique filter can be prevented.

[0014] Furthermore, a first water purification filter element is provided at the bottom of the sewage treatment tank, which is located above the first water outlet pipe and is used to filter purified water obtained after sewage purification; a second water purification filter element is provided at the bottom of the debris collection tank, which is located above the second water outlet pipe and is used to filter purified water; the first purification filter element includes a first membrane cloth layer arranged inside the sewage treatment tank and between the oblique filter screen and the first water outlet pipe, and a first support frame arranged between the first membrane cloth layer and the inner bottom surface of the sewage treatment tank; the second purification filter element includes a second membrane cloth layer arranged inside the debris collection tank and between the debris support oblique plate and the second water outlet pipe, and a second support frame arranged between the second membrane cloth layer and the inner bottom surface of the debris collection tank; a first fine filter screen is provided at the connecting end of the first water outlet pipe and the sewage treatment tank, and a second fine filter screen is provided at the connecting end of the second water outlet pipe and the debris collection tank. By arranging the first membrane cloth layer and the first support frame, the second membrane cloth layer and the second support frame, it is convenient to filter out fine impurities from sewage in the sewage treatment tank and the debris collection tank, and by using the first fine filter mesh and the second fine filter mesh, it is convenient to further filter the purified water discharged from the first water outlet pipe and the second water outlet pipe, thereby ensuring the quality of the discharged purified water and providing a guarantee for the recycling and reuse of the purified water. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic structural diagram of a circulating water filtration and purification device proposed in Example 1 of the present application is shown;

[0017] Figure 2 Shows Figure 1 A magnified view of the structure of the middle part A;

[0018] Figure 3 A schematic diagram of a circulating water filtration and purification device proposed in Example 2 of the present application is shown. DETAILED DESCRIPTION

[0019] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0020] The figure marks in the drawings of the specification include: sewage treatment tank 1, debris collection tank 2, sewage transfer pipe 3, oblique filter screen 4, debris support inclined plate 5, first water outlet pipe 6, second water outlet pipe 7, water outlet main pipe 8, debris water filter screen 9, insertion groove 10, blocking plug plate 11, push-pull rod 12, first feeding pipe 13, first feeding valve 14, first water outlet valve 15, second water outlet valve 16, second feeding pipe 17, second feeding valve 18, feed trough 19, vertical filter screen 20, first membrane cloth layer 21, first support frame 22, second membrane cloth layer 23, second support frame 24, first fine filter screen 25, second fine filter screen 26, water outlet main valve 27.

[0021] A circulating water filtering and purification device, embodiment 1 Figure 1 As shown: it includes a sewage treatment tank 1 connected to an industrial drainage pipe and a debris collection tank 2 connected to one side of the sewage treatment tank 1, a sewage transfer pipe 3 is connected between the sewage treatment tank 1 and the industrial drainage pipe, an oblique filter screen 4 located below the sewage transfer pipe 3 is provided on the inner side of the sewage treatment tank 1, a sewage purification component located below the oblique filter screen 4 and used for purifying sewage is provided at the inner bottom of the sewage treatment tank 1, a debris support inclined plate 5 parallel to the oblique filter screen 4 and arranged in a collinear manner is provided on the inner side of the debris collection tank 2, the top of the debris support inclined plate 5 is connected to the bottom of the oblique filter screen 4, the bottom of the debris support inclined plate 5 is provided with a water filter component for filtering sewage from debris in the debris collection tank 2, a water filter purification component located below the debris support inclined plate 5 is provided at the inner bottom of the debris collection tank 2, and a drainage component for discharging water from the sewage treatment tank 1 and the debris collection tank 2 is provided at the bottom of the sewage treatment tank 1.

[0022] Among them, Figure 1 and Figure 3 As shown, the drainage component includes a first water outlet pipe 6 arranged at one end of the bottom of the sewage treatment tank 1 near the debris collection tank 2, a second water outlet pipe 7 arranged at one end of the bottom of the debris collection tank 2 near the sewage treatment tank 1, a water outlet main pipe 8 connected between the first water outlet pipe 6 and the second water outlet pipe 7, and a water outlet regulating valve for adjusting the on-off of the first water outlet pipe 6 and the second water outlet pipe 7. The water outlet main pipe 8 is also connected to the industrial production water tank.

[0023] Among them, Figures 1 to 3 As shown, the water filter element includes a debris water filter net 9 arranged between the bottom end of the debris support inclined plate 5 and the inner wall of one side of the debris collection tank 2, an insertion groove 10 arranged laterally in the middle of the side of the debris water filter net 9 away from the sewage treatment tank 1, and a blocking plug plate 11 that can slide in the insertion groove 10 and is used to block the debris water filter net 9. The blocking plug plate 11 is also slidably connected to the side wall of the debris collection tank 2, and a push-pull rod 12 is also provided at the end of the blocking plug plate 11 away from the sewage treatment tank 1.

[0024] Among them, Figure 1 and Figure 3As shown, the sewage purification component includes a first feeding pipe 13 arranged at the top of one side of the sewage treatment tank 1 and located below the oblique filter 4 and a first feeding valve 14 installed on the first feeding pipe 13.

[0025] Among them, Figure 1 As shown, the water outlet regulating valve includes a first water outlet valve 15 provided on the first water outlet pipe 6 and a second water outlet valve 16 provided on the second water outlet pipe 7. The water filtration and purification component is a feeding component provided in the plugging plate 11 and used for adding a purifying agent to the bottom of the debris collection tank 2, such as Figure 1 and Figure 2 As shown, the feeding part includes a second feeding pipe 17 arranged on the left side of the blocking plug plate 11 and a second feeding valve 18 arranged on the second feeding pipe 17, and a feeding trough 19 connected between the second feeding pipe 17 and the bottom of the debris collection tank 2 is provided at the bottom of the blocking plug plate 11.

[0026] Among them, Figure 1 and Figure 3 As shown, one end of the oblique filter screen 4 is installed and connected to the inner top of the sewage treatment tank 1 away from the end of the debris collection tank 2, and the other end of the oblique filter screen 4 is connected to the debris support inclined plate 5. The sewage transfer pipe 3 is installed in the middle of the top of the sewage treatment tank 1, and the oblique filter screen 4 is provided with a vertical filter screen 20 connected to the bottom end of the sewage transfer pipe 3.

[0027] Among them, Figure 1 and Figure 3 As shown, a first water purification filter element is provided at the bottom of the sewage treatment tank 1, which is located above the first water outlet pipe 6 and is used to filter the purified water obtained after the sewage is purified. A second water purification filter element is provided at the bottom of the debris collection tank 2, which is located above the second water outlet pipe 7 and is used to filter the purified water. The first purification filter element includes a first membrane cloth layer 21 provided inside the sewage treatment tank 1 and between the oblique filter screen 4 and the first water outlet pipe 6, and a first support frame 22 provided between the first membrane cloth layer 21 and the inner bottom surface of the sewage treatment tank 1. The second purification filter element includes a second membrane cloth layer 23 provided inside the debris collection tank 2 and between the debris support inclined plate 5 and the second water outlet pipe 7, and a second support frame 24 provided between the second membrane cloth layer 23 and the inner bottom surface of the debris collection tank 2. A first fine filter screen 25 is provided at the connection end of the first water outlet pipe 6 and the sewage treatment tank 1, and a second fine filter screen 26 is provided at the connection end of the second water outlet pipe 7 and the debris collection tank 2.

[0028] In the specific implementation process of the present utility model, sewage flows from the sewage transfer pipe 3 to the top of the oblique filter 4, and with the action of gravity, the sewage is filtered through the oblique filter 4 and falls on the bottom of the sewage treatment tank 1. At this time, the first outlet valve 15 and the second outlet valve 16 are closed, the first feeding valve 14 and the second feeding valve 18 are opened, and the purifier is introduced into the sewage treatment tank 1 and the debris collection tank 2 through the first feeding pipe 13 and the second feeding pipe 17 respectively for purification reaction treatment. After a period of reaction, the purification of the sewage in the sewage treatment tank 1 and the debris collection tank 2 is completed, and then the first outlet valve 15 and the second outlet valve 16 are opened, and the purified water passes through the first membrane cloth layer 21 and the second membrane cloth layer 23, the first fine filter 25 and the second fine filter 26, the first outlet pipe 6 and the second outlet pipe 7, respectively, to filter and remove impurities from the sewage in the sewage treatment tank 1 and the debris collection tank 2, and then the circulation discharge and use of the purified water are realized.

[0029] The difference between the second embodiment and the first embodiment is that Figure 3 As shown, the structures of the water outlet regulating valve and the water filtration and purification component are different, that is, the purification treatment methods for the sewage at the bottom of the debris collection tank 2 are different, such as Figure 3 As shown, the outlet regulating valve is a main outlet valve 27 detachably mounted on the main outlet pipe 8, and the water filtration and purification assembly is a first outlet pipe 6 and a second outlet pipe 7 for diffusing the purifier in the sewage treatment tank 1 to the debris collection tank 2. In the specific implementation process, the purifier is added to the sewage treatment tank 1 through the first feeding pipe 13, and the purifier diffuses in the sewage and successively passes through the first fine filter 25, the first outlet pipe 6, the second outlet pipe 7 and the second fine filter 26 to diffuse into the debris collection tank 2. Before this, it is also necessary to ensure that the push-pull rod 12 blocks the feed trough 19 to prevent the sewage from flowing back to the top of the debris support inclined plate 5, so as to achieve the purification of the sewage in the sewage treatment tank 1 and the debris collection tank 2 at the same time. After the purification is completed, the main outlet pipe 8 is opened to discharge the purified water and re-discharge it into the industrial production water tank.

[0030] Compared with the prior art, the utility model not only achieves the filtration and removal of sewage, but also facilitates the guidance and aggregation of the debris by arranging the oblique filter screen 4 and the debris supporting inclined plate 5. By arranging the water filter, it is convenient to further remove the debris in the debris collection pool 2, thereby improving the reuse rate of sewage recycling treatment. The discharged sewage is purified and filtered by the sewage treatment pool 1, and the purified water is reused, which saves a lot of water resources and enables the sewage to be recycled. The problem of traditional sewage treatment that the sewage contains a lot of debris, which affects the effect of the purifier, resulting in poor purification effect and affecting the reuse of purified water is solved.

[0031] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A circulating water filtering and purification device, characterized in that: It includes a sewage treatment pool connected to an industrial drainage pipe and a debris collection pool connected to one side of the sewage treatment pool, a sewage transfer pipe is connected between the sewage treatment pool and the industrial drainage pipe, an oblique filter screen located below the sewage transfer pipe is provided on the inner side of the sewage treatment pool, a sewage purification component located below the oblique filter screen and used for purifying sewage is provided on the inner bottom of the sewage treatment pool, a debris support inclined plate parallel to and collinear with the oblique filter screen is provided on the inner side of the debris collection pool, the top of the debris support inclined plate is connected to the bottom of the oblique filter screen, a water filter component used for filtering sewage from debris in the debris collection pool is provided at the bottom of the debris collection pool, a water filter purification component located below the debris support inclined plate is provided on the inner bottom of the debris collection pool, and a drainage component used for discharging water from the sewage treatment pool and the debris collection pool is provided at the bottom of the sewage treatment pool.

2. A circulating water filtration and purification device according to claim 1, characterized in that: The drainage component includes a first water outlet pipe arranged at one end of the bottom of the sewage treatment tank close to the debris collection tank, a second water outlet pipe arranged at one end of the bottom of the debris collection tank close to the sewage treatment tank, a water outlet main pipe connected between the first water outlet pipe and the second water outlet pipe, and a water outlet regulating valve for regulating the on-off of the first water outlet pipe and the second water outlet pipe. The water outlet main pipe is also connected to the industrial production water tank.

3. A circulating water filtration and purification device according to claim 2, characterized in that: The water filter element includes a debris water filter net arranged between the bottom end of the debris support inclined plate and the inner wall of one side of the debris collection tank, an insertion groove arranged laterally in the middle of the side of the debris water filter net away from the sewage treatment tank, and a blocking plug plate that can slide in the insertion groove and is used to block the debris water filter net. The blocking plug plate is also slidably connected to the side wall of the debris collection tank, and a push-pull rod is also provided at the end of the blocking plug plate away from the sewage treatment tank.

4. A circulating water filtration and purification device according to claim 3, characterized in that: The sewage purification component comprises a first feeding pipe which is arranged at the top of one side of the sewage treatment tank and located below the oblique filter screen, and a first feeding valve installed on the first feeding pipe.

5. A circulating water filtration and purification device according to claim 4, characterized in that: The water outlet regulating valve includes a first water outlet valve arranged on the first water outlet pipe and a second water outlet valve arranged on the second water outlet pipe. The water filtration and purification component is a feeding piece arranged in the blocking plug plate and used to add a purifier to the bottom of the debris collection tank. The feeding piece includes a second feeding pipe arranged on one side of the blocking plug plate and a second feeding valve arranged on the second feeding pipe. A feeding groove connected between the second feeding pipe and the bottom of the debris collection tank is provided at the bottom of the blocking plug plate.

6. A circulating water filtration and purification device according to claim 4, characterized in that: The water outlet regulating valve is a main water outlet valve detachably mounted on the main water outlet pipe, and the water filtration and purification component is a first water outlet pipe and a second water outlet pipe for diffusing the purifier in the sewage treatment tank to the debris collection tank.

7. A circulating water filtration and purification device according to claim 5 or 6, characterized in that: One end of the oblique filter is installed and connected to the inner top of the sewage treatment tank away from the debris collection tank, and the other end of the oblique filter is connected to the debris support inclined plate. The sewage transfer pipe is installed in the middle of the top of the sewage treatment tank. The oblique filter is provided with a vertical filter connected to the bottom end of the sewage transfer pipe.

8. A circulating water filtration and purification device according to claim 7, characterized in that: A first water purification filter element is provided at the bottom of the sewage treatment tank, which is located above the first water outlet pipe and is used to filter purified water obtained after sewage purification. A second water purification filter element is provided at the bottom of the debris collection tank, which is located above the second water outlet pipe and is used to filter purified water. The first purification filter element includes a first membrane cloth layer arranged inside the sewage treatment tank and between the oblique filter screen and the first water outlet pipe, and a first support frame arranged between the first membrane cloth layer and the inner bottom surface of the sewage treatment tank. The second purification filter element includes a second membrane cloth layer arranged inside the debris collection tank and between the debris support oblique plate and the second water outlet pipe, and a second support frame arranged between the second membrane cloth layer and the inner bottom surface of the debris collection tank. A first fine filter screen is provided at the connecting end of the first water outlet pipe and the sewage treatment tank, and a second fine filter screen is provided at the connecting end of the second water outlet pipe and the debris collection tank.