A distributed agricultural-wetland integrated water treatment and resource reuse system

Abstract

This invention belongs to the field of constructed wetlands, specifically a distributed agricultural-wetland integrated water treatment and resource reuse system. It includes ecological field ridges, farmland, farmhouses, integrated treatment equipment, connecting pipes, and subsurface flow wetlands. Multiple subsurface flow wetlands are dispersed throughout the farmland and connected in series via pipes. These wetlands, positioned below the farmland surface, collect farmland runoff on-site, preventing leakage and spread of eutrophic runoff. The runoff can be reused for irrigation after purification. During crop planting, the lower filter media purifies the water while adsorbing and purifying agricultural non-point source pollution, reducing the concentration of nitrogen and phosphorus organic matter in the runoff. Alternating planting of crops and emergent plants agitates the top layer of filter media, clearing blockages and further reducing the operation and maintenance costs of the subsurface flow wetlands.

Description

Technical Field

[0001] This invention belongs to the field of constructed wetlands, specifically a distributed agricultural-wetland integrated water treatment and resource reuse system. Background Technology

[0002] In constructed wetland water purification technology, subsurface flow wetlands are one of the commonly used technologies. The filter media in subsurface flow wetlands is the substrate and carrier of constructed wetlands. It supports the life processes of plants, animals and microorganisms in constructed wetlands. The successful interception of pollutants by the filter media creates favorable conditions for subsequent plant absorption.

[0003] However, the above technologies often have the following drawbacks: as a purification unit in the overall purification process, the subsurface flow wetland occupies a large area, and the water to be purified needs to be collected and evenly distributed into the subsurface flow wetland through the water distribution channel, and then discharged and collected through the drainage channel for reuse in irrigating farmland. The entire process unit occupies a large area, has high cost, complicated process, high energy consumption, and high subsequent operation and maintenance costs.

[0004] Therefore, the present invention provides a distributed agricultural-wetland integrated water treatment and resource reuse system. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a distributed agricultural-wetland integrated water treatment and resource reuse system to reduce the operation and maintenance costs of subsurface flow wetlands.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A distributed agricultural-wetland integrated water quality treatment and resource reuse system of this invention includes ecological field ridges, farmland, farmhouses, integrated treatment equipment, connecting pipes, and subsurface flow wetlands. Multiple subsurface flow wetlands are set up and dispersed in the farmland. The multiple subsurface flow wetlands are connected in series by connecting pipes. The farmhouses are connected to the connecting pipes by the integrated treatment equipment. A water storage tank is set up on one side of the subsurface flow wetland. A cleaning component is set up in the water storage tank. The subsurface flow wetland is filled with filter media. A water trough is opened between the subsurface flow wetland and the water storage tank. Crops are planted in the subsurface flow wetland.

[0007] During operation, domestic sewage from farmhouses is first purified by an integrated treatment system and then discharged into the subsurface flow wetland through connecting pipes. After being purified layer by layer by the series of subsurface flow wetlands, the sewage is discharged into a reservoir inside the subsurface flow wetland for subsequent irrigation. At the same time, crops planted above the subsurface flow wetland fully utilize the nitrogen and phosphorus-rich substances trapped in the filter media, thereby improving the utilization rate of nitrogen and phosphorus-rich substances trapped in the filter media. The series of subsurface flow wetlands can reduce the occupation of large areas of land, reduce construction costs and energy consumption, and lower operation and maintenance costs.

[0008] Preferably, the subsurface flow wetland is arranged in a sunken manner, with its horizontal height lower than that of the farmland. The crops in the subsurface flow wetland are economic crops or emergent plants. During operation, the subsurface flow wetland is set at a height lower than that of the farmland, allowing irrigation water from the farmland to flow into the subsurface flow wetland by gravity, thus achieving on-site collection of farmland runoff. At the same time, by alternating the planting of crops and emergent plants in the subsurface flow wetland, agricultural non-point source pollution generated by crop planting in the farmland is purified, reducing the risk of runoff leakage from eutrophic farmland. When crops and emergent plants are planted alternately, the top layer of filter media is turned over, which also helps to clear blockages between the filter media, further reducing the operation and maintenance costs of the subsurface flow wetland.

[0009] Preferably, the cleaning component includes a motor, which is fixedly installed on the surface of the water storage tank. The output shaft of the motor is a lead screw, and a slider is movably connected to the surface of the lead screw. A connecting plate is slidably connected to the surface of the slider via a spring. A scraper is fixedly connected to the other end of the connecting plate. An arc-shaped guide plate is provided on the bottom surface of the water storage tank.

[0010] During operation, when sludge accumulates to a certain level in the storage tank, the motor is controlled to rotate forward, causing the output shaft of the motor to drive the lead screw to rotate. At the same time, the slider on the surface of the lead screw slides, causing the slider to move the connecting plate. The connecting plate then drives the scraper to scrape and clean the bottom surface of the storage tank. When the scraper moves to the position of the guide plate, it is guided by the arc-shaped guide plate to move upward. At the same time, it moves the connecting plate and stretches the spring. When the scraper moves to the edge of the storage tank, the sludge falls down due to gravity. The motor drives the lead screw in conjunction with the scraper to clean the sludge deposited on the bottom surface of the storage tank, preventing sludge accumulation in the storage tank and reducing its storage capacity.

[0011] Preferably, the side wall of the water storage tank is provided with a guide rail groove, and the surface of the scraper is provided with a groove. A cleaning plate is slidably connected in the groove, and the two ends of the cleaning plate are slidably connected in the guide rail groove by sliding shafts. During operation, when the scraper moves, it will drive the cleaning plate to move in the guide rail groove. When the scraper moves upward, the cleaning plate will move downward relative to the scraper surface under the restriction of the guide rail groove, thereby cleaning the sludge adhering to the scraper surface and improving the cleaning effect of the scraper.

[0012] Preferably, the scraper surface is arc-shaped and is located in the middle of the water storage tank. The arc surface of the scraper and the guide plate are symmetrically designed. During operation, the centrally designed scraper scrapes back and forth to both sides with the middle of the water storage tank as the dividing line, avoiding scraping too much mud at one time, which would increase the weight and damage the motor. At the same time, the arc-shaped scraper can shovel up the sludge, improving the cleaning effect.

[0013] Preferably, the scraper is positioned below the water surface, and the upper part of the scraper is a filter screen. During operation, the design of being below the water surface can prevent water waves from impacting the scraper as it moves back and forth, thus avoiding the sludge being washed away and affecting the cleaning effect of the scraper. At the same time, the filter screen can remove floating impurities on the water surface, further improving the cleaning effect on the water storage tank.

[0014] Preferably, the scraper has a cavity, and a base plate is fixedly connected inside the cavity. Multiple magnetic blocks are fixedly connected to the surface of the base plate. The cleaning plate also has a cavity, and a vibrating plate and a fixed shaft are fixedly connected to the inner wall of the cavity of the cleaning plate. An impact block is slidably connected to the surface of the fixed shaft through a spring. The impact block is made of a magnetically attractive material. During operation, when the cleaning plate moves downwards, the impact block inside the cleaning plate will move closer to the magnetic block due to the influence of the magnetic block. Then, when the cleaning plate passes the magnetic block, the spring drives the impact block to strike the vibrating plate, so that the vibration generated by the vibrating plate is transmitted to the cleaning plate to clean the cleaning plate. The design of multiple magnetic blocks can make the vibrating plate vibrate frequently, improving the cleaning effect.

[0015] Preferably, there are two filters, which are made of elastic material. An elastic sheet is fixedly connected to one side of the filters that are close to each other. A crossbeam is fixedly connected to one side of the cleaning plate. The other end of the crossbeam is slidably connected to a scraper. The bottom surface of the scraper is a mesh surface. A top rod is fixedly connected to the surface of the crossbeam. The top rod is slidably connected to the elastic sheet. A groove is opened on the surface of the top rod. A baffle is slidably connected to the groove by a spring.

[0016] During operation, as the cleaning plate moves downwards, it moves the crossbeam, which in turn moves the top rod in the same direction. This causes the baffle on the top rod surface to compress the elastic sheet, causing deformation and pulling the filter screens on both sides closer together. Then, as the top rod continues to move downwards, the baffle rotates and retracts into the slot, compressing the spring. This causes the elastic sheet and filter screen to return to their original positions simultaneously, ejecting impurities from the filter screen and helping them to detach. When the top rod resets, it passes through the elastic sheet again, ready for the next pull.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The distributed agricultural-wetland integrated water treatment and resource reuse system of the present invention can collect farmland runoff on-site through a subsurface flow wetland below the farmland, preventing the leakage and spread of eutrophic farmland runoff. At the same time, it can be reused and purified for farmland irrigation. When planting crops, the filter media below can adsorb and purify agricultural non-point source pollution while purifying the water, reducing the concentration of nitrogen and phosphorus organic matter in farmland runoff. When crops and emergent plants are planted alternately, the top layer of filter media will be turned over, which will also play a role in cleaning the blockage between the filter media, further reducing the operation and maintenance costs of the subsurface flow wetland.

[0019] 2. The distributed agricultural-wet composite water treatment and resource reuse system of the present invention controls the forward rotation of the motor, causing the output shaft of the motor to drive the lead screw to rotate, which in turn causes the slider on the surface of the lead screw to slide. The slider then drives the connecting plate, which in turn drives the scraper to scrape and clean the bottom surface of the water storage tank. When the scraper moves to the position of the guide plate, it is guided by the arc-shaped guide plate to move upward, which in turn drives the connecting plate to move and stretches the spring. When the scraper moves to the edge of the water storage tank, the sludge falls down by gravity. The motor drives the lead screw in conjunction with the scraper to achieve the effect of cleaning the sludge deposited on the bottom surface of the water storage tank, avoiding the accumulation of sludge in the water storage tank and reducing the storage capacity of the water storage tank. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a flowchart of the distributed agricultural-wetland integrated water treatment and resource reuse system of the present invention;

[0022] Figure 2 This is a schematic diagram of the subsurface flow wetland in this invention;

[0023] Figure 3 This is a partial cross-sectional schematic diagram of the subsurface flow wetland in this invention;

[0024] Figure 4 This is a schematic diagram of the front cross-sectional structure of the subsurface flow wetland in this invention;

[0025] Figure 5 This is a schematic diagram of a partial cross-sectional structure of the scraper in this invention;

[0026] Figure 6 It is in this invention Figure 5 Schematic diagram of the structure at point A in the middle;

[0027] Figure 7 It is in this invention Figure 5 Schematic diagram of the structure at point B.

[0028] In the diagram: 1. Ecological field ridge; 2. Farmhouse; 3. Integrated treatment equipment; 4. Connecting pipe; 5. Subsurface flow wetland; 6. Farmland; 7. Reservoir; 8. Crops; 9. Cleaning components; 91. Motor; 10. Lead screw; 11. Water tank; 12. Guide rail groove; 13. Scraper; 14. Filter screen; 15. Slider; 16. Guide plate; 17. Groove; 18. Cleaning plate; 19. Connecting plate; 20. Filter media; 21. Elastic sheet; 22. Top rod; 23. Crossbeam; 24. Base plate; 25. Magnetic block; 26. Fixed shaft; 27. Vibrating plate; 28. Impact block; 29. ​​Baffle; 30. Empty trough. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0030] Example 1:

[0031] like Figure 1 As shown in the embodiment of the present invention, a distributed agricultural-wetland integrated water treatment and resource reuse system includes an ecological field ridge 1, farmland 6, farmhouse 2, integrated treatment equipment 3, connecting pipes 4, and subsurface flow wetlands 5. Multiple subsurface flow wetlands 5 are provided and dispersedly located within the farmland 6. The multiple subsurface flow wetlands 5 are connected in series via connecting pipes 4. The farmhouse 2 is connected to the connecting pipes 4 via the integrated treatment equipment 3. A water storage tank 7 is provided on one side of each subsurface flow wetland 5. A cleaning component 9 is provided inside the water storage tank 7. Filter media 20 is filled inside the subsurface flow wetland 5. A water trough 11 is provided between the subsurface flow wetland 5 and the water storage tank 7. Crops 8 are planted within the subsurface flow wetland 5.

[0032] During operation, firstly, domestic sewage from farmhouse 2 is purified by integrated treatment equipment 3 and then discharged into subsurface flow wetland 5 through connecting pipe 4. After being purified layer by layer by the subsurface flow wetland 5, the sewage is discharged into the water storage tank 7 inside the subsurface flow wetland 5 for subsequent irrigation. At the same time, the crops 8 planted above the subsurface flow wetland 5 make full use of the nitrogen and phosphorus-rich substances intercepted in the filter media 20, thereby improving the utilization rate of the nitrogen and phosphorus-rich substances intercepted in the filter media 20 of the subsurface flow wetland 5. The series of subsurface flow wetlands 5 can reduce the occupation of a large area of ​​land, reduce construction costs and energy consumption, and lower operation and maintenance costs.

[0033] The subsurface flow wetland 5 is arranged in a sunken manner, with its horizontal height lower than that of the farmland 6. The crops 8 in the subsurface flow wetland 5 are either economic crops or emergent plants. During operation, the subsurface flow wetland 5 is set at a lower height than the farmland 6, allowing irrigation water from the farmland 6 to flow into the subsurface flow wetland 5 by gravity, thus achieving on-site collection of farmland runoff. At the same time, by alternating the planting of crops 8 and emergent plants in the subsurface flow wetland 5, agricultural non-point source pollution generated by the planting of crops 8 in the farmland 6 is purified, reducing the risk of leakage of runoff from the eutrophic farmland 6. When crops 8 and emergent plants are planted alternately, the top layer filter media 20 is turned over, which also serves to clean the blockages between the filter media 20, further reducing the operation and maintenance costs of the subsurface flow wetland 5.

[0034] Example 2:

[0035] like Figures 2 to 7As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the cleaning component 9 includes a motor 91, the motor 91 is fixedly installed on the surface of the water storage tank 7, the output shaft of the motor 91 is a lead screw 10, a slider 15 is movably connected to the surface of the lead screw 10, a connecting plate 19 is slidably connected to the surface of the slider 15 by a spring, a scraper 13 is fixedly connected to the other end of the connecting plate 19, and an arc-shaped guide plate 16 is provided on the bottom surface of the water storage tank 7;

[0036] During operation, when sludge accumulates to a certain level in the water storage tank 7, the motor 91 is controlled to rotate forward, causing the output shaft of the motor 91 to drive the lead screw 10 to rotate. At the same time, the slider 15 on the surface of the lead screw 10 will slide, causing the slider 15 to drive the connecting plate 19. The connecting plate 19 will drive the scraper 13 to scrape and clean the bottom surface of the water storage tank 7. When the scraper 13 moves to the position of the guide plate 16, it will move upward through the guidance of the arc-shaped guide plate 16. At the same time, it will drive the connecting plate 19 to move and stretch the spring. When the scraper 13 moves to the edge of the water storage tank 7, the sludge will fall down due to gravity. The motor 91 drives the lead screw 10 to cooperate with the scraper 13 to achieve the effect of cleaning the sludge deposited on the bottom surface of the water storage tank 7, avoiding the accumulation of sludge in the water storage tank 7 and reducing the storage capacity of the water storage tank 7.

[0037] The side wall of the water storage tank 7 is provided with a guide rail groove 12, and the surface of the scraper 13 is provided with a groove 17. A cleaning plate 18 is slidably connected in the groove 17. The two ends of the cleaning plate 18 are slidably connected in the guide rail groove 12 through sliding shafts. When working, when the scraper 13 moves, it will drive the cleaning plate 18 to move in the guide rail groove 12. When the scraper 13 moves upward, the cleaning plate 18 will move downward relative to the surface of the scraper 13 under the restriction of the guide rail groove 12, so as to clean the sludge adhering to the surface of the scraper 13, thereby improving the cleaning effect of the scraper 13.

[0038] The scraper 13 has an arc surface and is positioned in the middle of the water storage tank 7. The arc surface of the scraper 13 and the guide plate 16 are symmetrically designed. During operation, the centrally designed scraper 13 scrapes back and forth from the middle of the water storage tank 7 to both sides, avoiding scraping too much mud at once, which would increase the mass and damage the motor 91. At the same time, the arc-shaped scraper 13 can shovel up the sludge, improving the cleaning effect.

[0039] The scraper 13 is positioned below the water surface, and the upper part of the scraper 13 is a filter screen 14. During operation, the design of being below the water surface can prevent water waves from impacting the scraper 13 as it moves back and forth, thus avoiding the sludge being washed away and affecting the cleaning effect of the scraper 13. At the same time, the filter screen 14 can clean the floating impurities on the water surface, further improving the cleaning effect on the water storage tank 7.

[0040] The scraper 13 has a cavity, and a base plate 24 is fixedly connected inside the cavity. Multiple magnetic blocks 25 are fixedly connected to the surface of the base plate 24. The cleaning plate 18 also has a cavity. A vibrating plate 27 and a fixed shaft 26 are fixedly connected to the inner wall of the cavity of the cleaning plate 18. An impact block 28 is slidably connected to the surface of the fixed shaft 26 by a spring. The impact block 28 is made of a magnetically attractive material.

[0041] During operation, when the cleaning plate 18 moves downwards, the impact block 28 inside the cleaning plate 18 will move closer to the magnetic block 25 due to the influence of the magnetic block 25. Then, when the cleaning plate 18 passes the magnetic block 25, the spring drives the impact block 28 to strike the vibrating plate 27, so that the vibration generated by the vibrating plate 27 is transmitted to the cleaning plate 18 to clean the cleaning plate 18. The design of multiple magnetic blocks 25 can make the vibrating plate 27 vibrate frequently, thereby improving the cleaning effect.

[0042] Two filters 14 are provided and are made of elastic material. An elastic sheet 21 is fixedly connected to one side of the filters 14 that are close to each other. A crossbeam 23 is fixedly connected to one side of the cleaning plate 18. The other end of the crossbeam 23 is slidably connected through the scraper 13. The bottom surface of the scraper 13 is a mesh surface. A top rod 22 is fixedly connected to the surface of the crossbeam 23. The top rod 22 is slidably connected through the elastic sheet 21. A groove 30 is opened on the surface of the top rod 22. A baffle 29 is slidably connected in the groove 30 by a spring.

[0043] During operation, when the cleaning plate 18 moves downwards, it drives the crossbeam 23 to move. At the same time, the crossbeam 23 drives the top rod 22 to move in the same direction. This causes the baffle 29 on the surface of the top rod 22 to compress the elastic sheet 21 and deform. Simultaneously, it stretches the filter screens 14 on both sides closer together. Then, the top rod 22 continues to move downwards. At this time, the baffle 29 will rotate and retract into the empty groove 30 and compress the spring, causing the elastic sheet 21 and the filter screen 14 to recover simultaneously. This also ejects the impurities in the filter screen 14, helping the impurities in the filter screen 14 to detach. Then, when the top rod 22 resets, it will pass through the elastic sheet 21 again, preparing for the next pull.

[0044] Working principle: First, domestic sewage from farmhouse 2 is purified by integrated treatment equipment 3 and then discharged into subsurface flow wetland 5 through connecting pipe 4. After being purified layer by layer by the series of subsurface flow wetlands 5, the sewage is discharged into the water storage tank 7 inside the subsurface flow wetland 5 for subsequent irrigation. Simultaneously, crops 8 planted above the subsurface flow wetland 5 fully utilize the nitrogen and phosphorus-rich substances retained in the filter media 20, thereby improving the utilization rate of these substances. The series of subsurface flow wetlands 5 reduces the land occupation and construction costs. To reduce energy consumption and lower operation and maintenance costs, the subsurface flow wetland 5 is set at a lower height than the farmland 6, allowing irrigation water from the farmland 6 to flow into the subsurface flow wetland 5 by gravity, thus collecting farmland runoff on-site. At the same time, by alternating the planting of crops 8 (corn, wheat, etc.) and emergent plants in the subsurface flow wetland 5, agricultural non-point source pollution generated by the planting of crops 8 in the farmland 6 is purified, reducing the risk of leakage of runoff from eutrophic farmland 6. When crops 8 and emergent plants are planted alternately, the top layer filter media 20 is turned over, which also helps to clean the blockages between the filter media 20, further reducing the operation and maintenance costs of the subsurface flow wetland 5.

[0045] When sludge accumulates to a certain level in the water storage tank 7, the motor 91 is controlled to rotate forward, causing the output shaft of the motor 91 to drive the lead screw 10 to rotate. Simultaneously, the slider 15 on the surface of the lead screw 10 slides, causing the slider 15 to move the connecting plate 19. The connecting plate 19 then drives the scraper 13 to scrape and clean the bottom surface of the water storage tank 7. When the scraper 13 moves to the position of the guide plate 16, it is guided upwards by the arc-shaped guide plate 16, simultaneously causing the connecting plate 19 to move and stretch the spring. As the scraper 13 moves into the water storage tank 7... When at the edge, the sludge falls due to gravity. The motor 91 drives the lead screw 10 to work with the scraper 13 to clean the sludge deposited on the bottom of the water storage tank 7, thus preventing the accumulation of sludge in the water storage tank 7 and reducing its storage capacity. When the scraper 13 moves, it will drive the cleaning plate 18 to move in the guide groove 12. When the scraper 13 moves upward, the cleaning plate 18 will move downward relative to the surface of the scraper 13 under the restriction of the guide groove 12, thus cleaning the sludge adhering to the surface of the scraper 13 and improving the cleaning effect of the scraper 13.

[0046] The design of being below the water surface avoids water waves from impacting the sludge when the scraper 13 moves back and forth, which would affect the cleaning effect of the scraper 13. At the same time, the filter screen 14 can clean the floating impurities on the water surface, further improving the cleaning effect on the water storage tank 7. When the cleaning plate 18 moves relatively downward, the impact block 28 inside the cleaning plate 18 will move closer to the magnetic block 25 due to the influence of the magnetic block 25. Then, when the cleaning plate 18 passes the magnetic block 25, the spring drives the impact block 28 to impact the vibrating plate 27, so that the vibration generated by the vibrating plate 27 is transmitted to the cleaning plate 18 to clean the cleaning plate 18. The design of multiple magnetic blocks 25 can make the vibrating plate 27 vibrate frequently, improving the cleaning effect.

[0047] When the cleaning plate 18 moves downwards, it will drive the crossbeam 23 to move. At the same time, the crossbeam 23 will drive the top rod 22 to move in the same direction. This will cause the baffle 29 on the surface of the top rod 22 to compress the elastic sheet 21 and deform. At the same time, it will stretch the filter screens 14 on both sides to move closer to each other. Then the top rod 22 continues to move downwards. At this time, the baffle 29 will rotate and retract into the empty groove 30 and compress the spring, so that the elastic sheet 21 and the filter screen 14 will recover at the same time. This will also eject the impurities in the filter screen 14 and help the impurities in the filter screen 14 to get rid of them. Then, when the top rod 22 resets, it will pass through the elastic sheet 21 again, ready for the next pull.

[0048] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0049] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distributed farm-wet combined water quality treatment and resource reuse system, characterized in that: The system includes ecological field ridges (1), farmland (6), farmhouses (2), integrated treatment equipment (3), connecting pipes (4), and subsurface flow wetlands (5). Multiple subsurface flow wetlands (5) are provided and dispersed throughout the farmland (6). These wetlands are connected in series via connecting pipes (4). The farmhouses (2) are connected to the connecting pipes (4) via the integrated treatment equipment (3). A water storage tank (7) is provided on one side of each subsurface flow wetland (5). A cleaning component (9) is installed in the water storage tank (7). Filter media (20) is filled within the subsurface flow wetland (5). A water trough (11) is provided between the subsurface flow wetland (5) and the water storage tank (7). Crops (8) are planted within the subsurface flow wetland (5). The subsurface flow wetland (5) is arranged in a sunken manner, with its horizontal height lower than that of the farmland (6). The crops (8) in the land (5) are economic crops (8) or emergent plants; the cleaning component (9) includes a motor (91), the motor (91) is fixedly installed on the surface of the water storage tank (7), the output shaft of the motor (91) is a lead screw (10), the surface of the lead screw (10) is movably connected to a slider (15), the surface of the slider (15) is slidably connected to a connecting plate (19) by a spring, the other end of the connecting plate (19) is fixedly connected to a scraper (13), the bottom surface of the water storage tank (7) is provided with an arc-shaped guide plate (16); the side wall of the water storage tank (7) is provided with a guide rail groove (12), the surface of the scraper (13) is provided with a groove (17), the cleaning plate (18) is slidably connected in the groove (17), and the two ends of the cleaning plate (18) are slidably connected in the guide rail groove (12) by a sliding shaft.

2. The distributed farm-wet combined water quality treatment and resource reuse system according to claim 1, characterized in that: The scraper (13) has an arc surface and is located in the middle of the water storage tank (7). The arc surface of the scraper (13) and the guide plate (16) are symmetrically designed.

3. The distributed farm-wet combined water quality treatment and resource reuse system according to claim 2, characterized in that: The scraper (13) is positioned below the water surface, and the upper part of the scraper (13) is a filter screen (14).

4. The distributed farm-wet combined water quality treatment and resource reuse system according to claim 3, characterized in that: The scraper (13) has a cavity, and a base plate (24) is fixedly connected inside the cavity. Multiple magnetic blocks (25) are fixedly connected to the surface of the base plate (24). The cleaning plate (18) also has a cavity. A vibrating plate (27) and a fixed shaft (26) are fixedly connected to the inner wall of the cavity of the cleaning plate (18). An impact block (28) is slidably connected to the surface of the fixed shaft (26) by a spring. The impact block (28) is made of magnetic material.

5. The distributed farm-wet combined water quality treatment and resource reuse system according to claim 4, characterized in that: Two filters (14) are provided and are made of elastic material. An elastic sheet (21) is fixedly connected to one side of the filters (14) that are close to each other. A crossbeam (23) is fixedly connected to one side of the cleaning plate (18). The other end of the crossbeam (23) is slidably connected through the scraper (13). The bottom surface of the scraper (13) is a mesh surface. A top rod (22) is fixedly connected to the surface of the crossbeam (23). The top rod (22) is slidably connected through the elastic sheet (21). A slot (30) is opened on the surface of the top rod (22). A baffle (29) is slidably connected in the slot (30) by a spring.

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