Prefabricated wastewater treatment device and method

Abstract

The application belongs to the technical field of wastewater treatment, and discloses an assembled wastewater treatment device and method, wherein the assembled wastewater treatment device is arranged between the outer wall of a roadside building and a road, and comprises a wall-side water storage system, wall-side backfill, wall-side filtering facilities, a water storage and drainage system, roadside filtering facilities, roadside backfill and roadside water storage system arranged in sequence from the outer wall of the roadside building to the road; the wall-side water storage system is used for collecting outdoor rainwater and indoor wastewater in the area of the roadside building, the roadside water storage system is used for collecting rainwater and wastewater in the road area, and the backfill and filtering facilities are used for filtering and treating the wastewater before the wastewater is introduced into the water storage and drainage system, so that effective treatment and resource utilization of the wastewater in the non-rainy season are realized, and the seasonal functional limitation is effectively overcome; the indoor and outdoor wastewater treatment systems are integrated, the resource utilization is maximized, and the efficiency and economy of the wastewater treatment are improved.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and specifically relates to a prefabricated wastewater treatment device and method. Background Technology

[0002] With the rapid development of industrialization and urbanization, urban rainwater treatment and resource utilization have become important issues in the field of environmental protection. However, traditional wastewater treatment technologies for urban rainwater treatment often suffer from low efficiency, high costs, and complex construction processes. In order to solve these problems, researchers have been exploring more efficient, environmentally friendly, and economical wastewater treatment technologies.

[0003] Bioretention facilities, as an ecological engineering approach, utilize organisms, soil, and plants in the natural ecosystem to naturally purify wastewater. They can effectively remove pollutants such as suspended solids, organic matter, and nutrients from rainwater, while also having the advantages of being eco-friendly, thus playing a unique role in urban stormwater management.

[0004] However, existing urban stormwater management systems based on bioretention facilities often suffer from seasonal limitations, insufficient stormwater treatment and resource utilization, and high construction difficulty in practical applications. Specifically, traditional bioretention facilities can effectively treat stormwater during the rainy season, but they are unable to function effectively during the non-rainy season, leading to resource waste and facility idleness. Secondly, indoor wastewater is usually discharged directly into the municipal pipe network, failing to effectively utilize bioretention facilities for treatment and resource utilization, thus missing opportunities for wastewater resource utilization. In addition, the construction of existing bioretention facilities usually requires on-site pouring, which results in long construction cycles, high costs, and difficulties in subsequent maintenance and upgrades. Summary of the Invention

[0005] To address the technical problems existing in the prior art, the present invention provides a prefabricated wastewater treatment device and method, which solves the technical problems that existing urban rainwater management devices based on bioretention facilities often have in practical applications, such as limited seasonal functions, insufficient rainwater treatment and resource utilization, and high construction difficulty.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a prefabricated wastewater treatment device, which is installed between the exterior wall of a roadside building and the road. The device includes a wall-side water storage system, wall-side backfill, wall-side filtration facilities, a water storage and drainage system, a roadside filtration facilities, roadside backfill, and a roadside water storage system, arranged sequentially from the exterior wall of the roadside building to the road.

[0008] The wall-side water storage system is used to receive and store wastewater from the roadside building area; wherein, the wastewater from the roadside building area includes outdoor rainwater and indoor wastewater; the wall-side water storage system is provided with a wall-side overflow outlet so that the wastewater in the wall-side water storage system overflows into the wall-side backfill; the wall-side filtration facility is used to perform graded filtration on the wastewater flowing through the surface of the wall-side backfill and to allow the filtered wastewater to flow into the water storage and drainage system;

[0009] The roadside water storage system is used to receive and store wastewater from the road area; wherein, the roadside water storage system is provided with a roadside overflow outlet so that the wastewater in the roadside water storage system overflows into the roadside fill; the roadside filtration facility is used to perform graded filtration on the wastewater flowing over the surface of the roadside fill and to allow the filtered wastewater to flow into the water storage and drainage system.

[0010] Furthermore, the wall-side water storage system includes a rainwater pipe, a wall-side water storage tank, an indoor wastewater diversion pipe, and a sewage pipe;

[0011] The rainwater pipe is installed vertically on the outside of the exterior wall of the roadside building; the wall-side water storage tank is located on the outside of the bottom of the exterior wall of the roadside building and below the lower outlet of the rainwater pipe; a wall-side overflow outlet is provided at the top of the outer wall of the wall-side water storage tank and is located near the end of the wall-side backfill.

[0012] One end of the indoor wastewater diversion pipe is connected to the upper part of the inner wall of the wall-side water storage tank, and the other end of the indoor wastewater diversion pipe passes through the outer wall of the roadside building and is led to the indoor wastewater pipe of the roadside building; one end of the sewage pipe is connected to the bottom end of the inner wall of the wall-side water storage tank, and the other end of the sewage pipe passes through the outer wall of the roadside building and is led to the indoor sewage pipe of the roadside building.

[0013] Furthermore, the wall side fill includes the wall side fill body, wall side shrubs, and wall side aquatic plants;

[0014] The wall-side backfill body is constructed of soil and is arranged at an angle between the wall-side water storage system and the wall-side filtration facility; wherein, the side of the wall-side backfill body closer to the wall-side water storage system is higher than the side of the wall-side backfill body closer to the wall-side filtration facility, and the side of the wall-side backfill body closer to the wall-side water storage system is lower than the wall-side overflow outlet.

[0015] Both the wall-side shrubs and the wall-side aquatic plants are planted on the surface of the wall-side backfill body. The wall-side shrubs are planted closer to the wall-side water storage system, and the wall-side aquatic plants are planted closer to the wall-side filtration facility.

[0016] Furthermore, the wall-side backfill also includes a wall-side sprinkler head, a wall-side water pump, and a wall-side connecting water pipe; the inlet end of the wall-side connecting water pipe is connected to the water storage and drainage system, and the outlet end of the wall-side connecting water pipe extends upward from the bottom surface of the wall-side backfill body to the top surface of the wall-side backfill body, and is placed between the wall-side shrubs and the wall-side aquatic plants; the inlet end of the wall-side water pump is connected to the outlet end of the wall-side connecting water pipe, and the wall-side sprinkler head is installed at the outlet end of the wall-side water pump.

[0017] Furthermore, the wall-side filtration facility and the roadside filtration facility have the same structure, both adopting a stepped filtration facility; wherein, the stepped filtration facility includes a filtration facility foundation, mudguards, coarse pore filter plates, fine pore filter plates, ultra-fine pore filter plates, gravel gabions, crushed stone gabions, and activated carbon gabions.

[0018] The foundation of the filtration facility is set between the wall-side backfill and the water storage and drainage system or between the roadside backfill and the water storage and drainage system, and the top surface of the foundation of the filtration facility is inclined; wherein, the top end of the top surface of the foundation of the filtration facility is set close to the side of the wall-side backfill or the roadside backfill, and the bottom end of the top surface of the foundation of the filtration facility is set close to the side of the water storage and drainage system.

[0019] The mudguard, the coarse pore filter plate, the fine pore filter plate and the ultrafine pore filter plate are all vertically arranged on the top surface of the filter facility foundation, and are distributed at intervals from the top end of the top surface of the filter facility foundation to the bottom end of the top surface.

[0020] The gravel gabion, the crushed stone gabion, and the activated carbon gabion are all placed above the top surface of the foundation of the filtration facility; wherein, the gravel gabion is positioned between the mudguard and the coarse-pore filter plate, the crushed stone gabion is positioned between the coarse-pore filter plate and the fine-pore filter plate, and the activated carbon gabion is positioned between the fine-pore filter plate and the ultra-fine-pore filter plate.

[0021] Furthermore, the upper half of the mudguard is uniformly provided with first holes, the lower half of the coarse pore filter plate is uniformly provided with second holes, the lower half of the fine pore filter plate is uniformly provided with third holes, and the lower half of the ultrafine filter plate is provided with fourth holes; wherein, the outer side of the lower half of the ultrafine filter plate is wrapped with a reverse osmosis membrane.

[0022] Furthermore, the water storage and drainage system includes a first water storage tank, a drainage ditch, and a second water storage tank; the first water storage tank is located near the wall-side filtration facility and is used to receive and store the wastewater filtered by the wall-side filtration facility.

[0023] The second water storage tank is located near the roadside filtration facility and is used to receive and store the wastewater filtered by the roadside filtration facility; the drainage ditch is located between the first water storage tank and the second water storage tank and is used to guide the wastewater received in the first water storage tank and the second water storage tank to the sewage pipe.

[0024] Furthermore, the roadside water storage system includes a roadside water barrier and a roadside water storage tank;

[0025] The roadside baffle is set at the edge of the road and along the extension direction of the road; wherein, the roadside baffle has a water passage hole; the roadside water storage tank is set on the side of the road and is flush with the bottom end of the roadside baffle; wherein, the top of the outer wall of the roadside baffle is provided with a roadside overflow outlet, which is set near the end of the roadside fill.

[0026] Furthermore, both the wall-side overflow outlet and the road-side overflow outlet are equipped with filter screens.

[0027] The present invention also provides a prefabricated wastewater treatment method, utilizing the aforementioned prefabricated wastewater treatment device;

[0028] The prefabricated wastewater treatment method includes:

[0029] During the rainy season, outdoor rainwater from the roadside building area is introduced into the wall-side water storage system. The outdoor rainwater passes through the wall-side backfill and the wall-side filtration facilities before entering the water storage and drainage system. At the same time, wastewater from the road area flows into the roadside water storage system. The roadside wastewater passes through the roadside backfill and the roadside filtration facilities before entering the water storage and drainage system.

[0030] During the non-rainy season, indoor wastewater from roadside buildings is introduced into a wall-side water storage system. The indoor wastewater then passes through wall-side backfill and wall-side filtration facilities before entering the water storage and drainage system.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] The prefabricated wastewater treatment device and method provided by this invention sequentially installs a wall-side water storage system, wall-side backfill, wall-side filtration facilities, a water storage and drainage system, a roadside filtration facility, roadside backfill, and a roadside water storage system between the exterior wall of a roadside building and the road. The wall-side water storage system collects outdoor rainwater and indoor wastewater from the roadside building area, while the roadside water storage system collects rainwater and wastewater from the road area. After filtration using backfill and filtration facilities, the wastewater is introduced into the water storage and drainage system, achieving effective wastewater treatment and resource utilization during the non-rainy season and effectively overcoming seasonal functional limitations. By integrating indoor and outdoor wastewater treatment systems, resource utilization is maximized, improving the efficiency and economy of wastewater treatment, and providing an innovative solution for urban wastewater treatment and resource utilization. The prefabricated design simplifies the construction process, shortens the construction cycle, reduces construction costs, and improves the convenience of system maintenance and upgrades. Attached Figure Description

[0033] Figure 1 A schematic diagram of the overall structure of the prefabricated wastewater treatment device provided by the present invention;

[0034] Figure 2 This is a schematic diagram of the cascade filtration system in this invention;

[0035] Figure 3 This is a schematic diagram of the main structure of the cascade filtration system in this invention;

[0036] Figure 4 This is a schematic diagram of the water storage and drainage system in this invention;

[0037] Figure 5 This is a schematic diagram of the wall-side water storage system in this invention;

[0038] Figure 6 This is a schematic diagram of the roadside water storage system in this invention.

[0039] The components include: 1. Wall-side water storage system; 2. Wall-side backfill; 3. Wall-side filtration facilities; 4. Water storage and drainage system; 5. Road-side filtration facilities; 6. Road-side backfill; 7. Road-side water storage system; 8. Road-side building exterior wall; 9. Road; 101. Rainwater pipe; 102. Wall-side water storage tank; 103. Indoor wastewater diversion pipe; 104. Diversion pipe switch; 105. Diversion pipe electric valve; 106. Sewage pipe; 107. Sewage pipe switch; 108. Sewage pipe electric valve; 109. Sewage pump; 110. Wall-side rainwater grate; 111. Wall-side overflow filter; 112. Diversion pipe reserved hole; 113. Sewage pipe reserved hole; 201. Wall-side backfill body; 202. Wall-side shrubs; 203. Wall-side aquatic plants; 204. Wall-side spraying. 205 Roadside water pump, 206 Roadside connecting water pipe; 301 Filtration facility foundation, 302 Mudguard, 303 Coarse pore filter plate, 304 Fine pore filter plate, 305 Ultrafine filter plate, 306 Gravel gabion, 307 Crushed stone gabion, 308 Activated carbon gabion; 401 First reservoir, 402 Drainage ditch, 403 Second reservoir, 404 Drainage ditch pump; 601 Roadside backfill, 602 Roadside shrubs, 603 Roadside aquatic plants, 604 Roadside sprinkler head, 605 Roadside water pump, 606 Roadside connecting water pipe; 701 Roadside water barrier, 702 Roadside water tank, 703 Roadside overflow filter, 704 Roadside rain grate. Detailed Implementation

[0040] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0041] As attached Figure 1-6 As shown, the present invention provides a prefabricated wastewater treatment device, which is installed between the exterior wall 8 of a roadside building and the road 9. The prefabricated wastewater treatment device includes a wall-side water storage system 1, a wall-side backfill 2, a wall-side filtration facility 3, a water storage and drainage system 4, a roadside filtration facility 5, a roadside backfill 6, and a roadside water storage system 7. The wall-side water storage system 1, the wall-side backfill 2, the wall-side filtration facility 3, the water storage and drainage system 4, the roadside filtration facility 5, the roadside backfill 6, and the roadside water storage system 7 are arranged sequentially from the exterior wall 8 of the roadside building to the road 9.

[0042] The wall-side water storage system 1 is used to receive and store wastewater from the roadside building area; wherein, the wastewater from the roadside building area includes outdoor rainwater and indoor wastewater; the wall-side water storage system 1 is provided with a wall-side overflow outlet, which allows the wastewater in the wall-side water storage tank 102 of the wall-side water storage system 1 to overflow into the wall-side backfill 2; the wall-side filtration facility 3 is used to perform graded filtration on the wastewater flowing over the surface of the wall-side backfill 2, and to allow the filtered wastewater to flow into the first water storage tank 401 of the water storage and drainage system 4; wherein, the wall-side backfill 2 is used to purify wastewater using soil, plants and organisms.

[0043] The roadside water storage system 7 is used to receive and store wastewater from the road area 9; wherein, the roadside water storage system 7 is provided with a roadside overflow outlet, which allows the wastewater in the roadside water storage tank 702 of the roadside water storage system 7 to overflow into the roadside fill 6; the roadside filtration facility 3 is used to perform graded filtration on the wastewater flowing over the surface of the roadside fill 6, and to allow the filtered wastewater to flow into the second water storage tank 403 of the water storage and drainage system 4; wherein, the roadside fill 6 is used to purify wastewater using soil, plants and organisms.

[0044] In this invention, the wall-side water storage system 1 includes a rainwater pipe 101, a wall-side water storage tank 102, an indoor wastewater diversion pipe 103, a diversion pipe switch 104, a diversion pipe electric valve 105, a sewage pipe 106, a sewage pipe switch 107, a sewage pipe electric valve 108, a sewage pump 109, a wall-side rainwater grate 110, and a wall-side overflow filter 111.

[0045] The rainwater pipe 101 is vertically installed on the outside of the outer wall 8 of the roadside building. The rainwater pipe 101 is used to collect and divert rainwater from the roadside building area to the wall-side water storage tank 102. The wall-side water storage tank 102 is located at the bottom of the outer wall 8 of the roadside building and below the lower outlet of the rainwater pipe 101. The wall-side water storage tank 102 is a hollow water tank structure with an open top. A wall-side rainwater grate 110 is installed at the upper opening of the wall-side water storage tank 102. A wall-side overflow outlet is provided at the top of the outer wall of the wall-side water storage tank 102, and the wall-side overflow outlet is located near the end of the wall-side backfill 2.

[0046] One end of the indoor wastewater diversion pipe 103 is connected to the upper middle part of the inner wall of the wall-side water storage tank 102. The other end of the indoor wastewater diversion pipe 103 passes through the outer wall 8 of the roadside building and is connected to the indoor wastewater pipe of the roadside building. The diversion pipe switch 104 and the diversion pipe electric valve 105 are sequentially arranged on the indoor wastewater diversion pipe 103 to control the opening and closing of the indoor wastewater diversion pipe 103, so as to introduce part of the indoor wastewater into the wall-side water storage tank 102. The indoor wastewater diversion pipe 103 is inclined, that is, the end of the indoor wastewater diversion pipe 103 near the wall-side water storage tank 102 is lower than the end away from the wall-side water storage tank 102.

[0047] One end of the sewage pipe 106 is connected to the bottom of the inner wall of the wall-side water storage tank 102, and the other end of the sewage pipe 106 passes through the outer wall 8 of the roadside building and is connected to the indoor sewage pipe of the roadside building. The sewage pipe switch 107, the sewage pump 109 and the sewage pipe electric valve 108 are sequentially arranged on the sewage pipe 106. The sewage pipe switch 107 and the sewage pipe electric valve 108 are used to control the opening and closing of the sewage pipe 106 and the opening degree. The sewage pump 109 is used to pump the wastewater and sediment in the wall-side water storage tank 102 through the sewage pipe 106 to the indoor sewage pipe. The sewage pipe 106 is laid horizontally.

[0048] It should be noted that the wall-side water storage tank 102 is located below the lower outlet of the rainwater pipe 101, and the distance between the wall-side water storage tank 102 and the outer wall 8 of the roadside building is 3cm; the wall-side water storage tank 102 is a prefabricated water tank structure made of concrete, polyvinyl chloride board or stainless steel, and the dimensions of the wall-side water storage tank 102 are length × width × height = 50cm × 30cm × 50cm, and the long side of the wall-side water storage tank 102 is parallel to the extension direction of the outer wall 8 of the roadside building; the wall thickness of the wall-side water storage tank 102 is 2cm; the inner wall of the wall-side water storage tank 102 is provided with a diversion pipe reserved hole 112 and a sewage pipe reserved hole 113. The pre-drainage pipe hole 112 is located at the middle of the bottom end of the inner wall of the wall-side water storage tank 102, and the pre-drainage pipe hole 113 is located at a predetermined position in the upper middle part of the inner wall of the wall-side water storage tank 102. The pre-drainage pipe hole 112 is used for the connection between the indoor wastewater diversion pipe 103 and the wall-side water storage tank 102, and the pre-drainage pipe hole 113 is used for the connection between the sewage pipe 106 and the wall-side water storage tank 102. A wall-side overflow outlet is provided at the top of the outer wall of the wall-side water storage tank 102, and a wall-side overflow filter 111 is installed at the wall-side overflow outlet. The wall-side overflow filter 111 is 50cm long, 10cm high, and has a pore size of 1cm.

[0049] It should also be noted that the inner wall of the wall-side water storage tank 102 is the facade structure of the wall-side water storage tank 102 on the side close to the outer wall 8 of the roadside building, and the outer wall of the wall-side water storage tank 102 is the facade structure of the wall-side water storage tank 102 on the side close to the wall-side backfill 2.

[0050] In this invention, the wall-side backfill 2 includes a wall-side backfill body 201, wall-side shrubs 202, wall-side aquatic plants 203, wall-side sprinklers 204, wall-side water pumps 205, and wall-side connecting water pipes 206.

[0051] The wall-side backfill body 201 is constructed of soil and is arranged at an angle between the wall-side water storage tank 101 and the wall-side filter facility 3. The side of the wall-side backfill body 201 closest to the wall-side water storage tank 101 is higher than the side of the wall-side backfill body 201 closest to the wall-side filter facility 3. That is, the wall-side backfill body 201 is inclined downwards in the direction from the wall-side water storage system 1 to the wall-side filter facility 3. The side of the wall-side backfill body 201 closest to the wall-side water storage tank 101 is lower than the wall-side overflow outlet to ensure that wastewater overflowing from the wall-side water storage tank 101 can enter the wall-side backfill body 201. Preferably, the height difference between the top surface of the side of the wall-side backfill body 201 closest to the wall-side water storage tank 101 and the bottom edge of the wall-side overflow filter screen 111 is 3 cm.

[0052] Both the wall-side shrubs 202 and the wall-side aquatic plants 203 are planted on the surface of the wall-side backfill body 201. The wall-side shrubs 202 are planted on the side closer to the wall-side water storage tank 101, and the wall-side aquatic plants 203 are planted on the side closer to the wall-side filter facility 3. It should be noted that the wall-side shrubs 202 are shrubs planted on the wall-side backfill body 201, and the wall-side aquatic plants 203 are aquatic plants planted on the upper part of the wall-side backfill body 201. The inlet end of the wall-side connecting water pipe 206 is connected to the first water storage tank 401 in the water storage and drainage system 4. The outlet end of the wall-side connecting water pipe 206 extends upward from the bottom surface of the wall-side backfill body 201 to the top surface of the wall-side backfill body 201 and is placed between the wall-side shrubs 202 and the wall-side aquatic plants 203. The inlet end of the wall-side water pump 205 is connected to the outlet end of the wall-side connecting water pipe 206, and the wall-side sprinkler head 204 is installed at the outlet end of the wall-side water pump 205.

[0053] In this invention, the wall-side filtration facility 3 adopts a stepped filtration facility; the stepped filtration facility includes a filtration facility foundation 301, a mudguard 302, a coarse pore filter plate 303, a fine pore filter plate 304, an ultra-fine pore filter plate 305, a gravel gabion 306, a crushed stone gabion 307, and an activated carbon gabion 308.

[0054] The foundation 301 of the filtration facility is disposed between the backfill 2 on the wall side and the water storage and drainage system 4, and the top surface of the foundation 301 is inclined; wherein, the top end of the top surface of the foundation 301 is disposed near the backfill 2 on the wall side, and the bottom end of the top surface of the foundation 301 is disposed near the water storage and drainage system 4; the mudguard 302, the coarse pore filter plate 303, the fine pore filter plate 304 and the ultra-fine pore filter plate 305 are all vertically disposed on the filtration facility. The top surface of the foundation 301 is provided with holes spaced apart from the top end to the bottom end of the top surface of the filter facility foundation 301; wherein, the upper half of the mudguard 302 is uniformly provided with first holes, the lower half of the coarse pore filter plate 303 is uniformly provided with second holes, the lower half of the fine pore filter plate 304 is uniformly provided with third holes, and the lower half of the ultrafine filter plate 305 is provided with fourth holes; wherein, the lower half of the ultrafine filter plate 305 is wrapped with a reverse osmosis membrane.

[0055] Specifically, the foundation 301 of the filtration facility is located between the backfill body 201 on the wall side and the first water storage tank 401 in the water storage and drainage system 4; the foundation 301 of the filtration facility is provided with four vertical baffles in sequence from the end near the backfill body 201 to the end away from the backfill body 201; wherein, the four vertical baffles are sequentially configured as a mud baffle 302, a coarse pore filter plate 303, a fine pore filter plate 304 and an ultra-fine pore filter plate 305; preferably, the horizontal distance between the four vertical baffles is 20cm, and the height of the four vertical baffles is 25cm; it should be noted that the upper half of the four vertical baffles is the area 5cm down from the top, and the lower half is the area 20cm up from the bottom.

[0056] The upper half of the mudguard 302 is the top; the upper half of the mudguard 203 has two rows of rectangular holes arranged in a linear array; the cross-sectional dimensions of the rectangular holes are length × width = 2cm × 1cm, and the distance between two adjacent rectangular holes is 1cm; the lower half of the mudguard 302 is a solid plate structure; the upper half of the coarse-pore filter plate 303 is a solid plate structure, and the lower half of the coarse-pore filter plate 303 has inclined circular holes with a diameter of 2cm; the upper half of the fine-pore filter plate 304 is a solid plate structure, and the fine-pore filter plate 304 has inclined circular holes with a diameter of 2cm. The lower half of the perforated filter plate 304 has inclined circular holes with a diameter of 1 cm; wherein, the inclination direction of the inclined circular holes on the coarse-pore filter plate 303 and the fine-pore filter plate 304 matches the inclination direction of the top surface of the filter facility foundation 301, and the distance between two adjacent inclined circular holes is 1 cm; the upper half of the ultrafine filter plate 305 is a solid plate structure, the lower half of the ultrafine filter plate 305 has inclined circular holes, and the outer side of the lower half of the ultrafine filter plate 305 is wrapped with a reverse osmosis membrane; wherein, the reverse osmosis membrane is embedded in the ultrafine filter plate 305.

[0057] It should be noted that, from the mudguard 302 to the ultrafine filter plate 305, the top height of the next vertical baffle is lower than the top height of the previous vertical baffle; that is, the top height of two adjacent vertical baffles decreases sequentially, and the height difference is 5cm; the tops of all four vertical baffles are flat, and the bottoms are inclined; the interface between the upper and lower parts of the mudguard 302 is flat and parallel to the top surface of the vertical baffle; the interface between the upper and lower parts of the coarse pore filter plate 303, fine pore filter plate 304, and ultrafine filter plate 305 is also inclined and parallel to the bottom surface of the vertical baffle; the bottom surface of the filter facility foundation 301 is flat, the bottom of the mudguard 302 is 25cm above the bottom surface of the filter facility foundation 301, and the bottom of the ultrafine filter plate 306 is 10cm above the bottom surface of the filter facility foundation 301.

[0058] The gravel gabion 306, the crushed stone gabion 307, and the activated carbon gabion 308 are all placed above the top surface of the filter facility foundation 301; wherein, the gravel gabion 306 is positioned between the mudguard 302 and the coarse pore filter plate 303, the crushed stone gabion 307 is positioned between the coarse pore filter plate 303 and the fine pore filter plate 304, and the activated carbon gabion 308 is positioned between the fine pore filter plate 304 and the ultra-fine pore filter plate 305. Specifically, a parallelepiped groove is formed between the mudguard 302 and the coarse-pore filter plate 303 to hold a gravel gabion 306; a parallelepiped groove is formed between the coarse-pore filter plate 303 and the fine-pore filter plate 304 to hold a crushed stone gabion 307; a parallelepiped groove is formed between the fine-pore filter plate 304 and the ultrafine filter plate 305 to hold an activated carbon gabion 308; wherein the gravel gabion 306, the crushed stone gabion 307, and the activated carbon gabion 308 are all parallelepiped structures.

[0059] In this invention, the water storage and drainage system 4 includes a first water storage tank 401, a drainage ditch 402, a second water storage tank 403, and a drainage ditch pump 404; the first water storage tank 401 is located near the wall-side filter facility 3 and is used to receive and store the wastewater filtered by the wall-side filter facility 3; the second water storage tank 403 is located near the roadside filter facility 5 and is used to receive and store the wastewater filtered by the roadside filter facility 6; the drainage ditch 402 is located between the first water storage tank 401 and the second water storage tank 403 and is used to guide the wastewater received in the first water storage tank 401 and the second water storage tank 403 to the sewage pipe.

[0060] Specifically, the first water storage tank 401 and the second water storage tank 403 are both hollow water tank structures with open tops made of concrete, polyvinyl chloride board or stainless steel; the drainage ditch 402 is a drainage ditch with an open top prefabricated using concrete, polyvinyl chloride board or stainless steel; the first water storage tank 401, the drainage ditch 402 and the second water storage tank 403 are closely fitted together and their bottom surfaces are flush.

[0061] The top opening of the first water storage tank 401 is covered with a rainwater grate, the top surface of which is 3cm lower than the bottom of the ultrafine filter plate 305 in the wall-side filter facility 3; the first water storage tank 401 is tightly fitted to the foundation 301 of the filter facility, and the vertical fitting height is 5cm; the dimensions of the first water storage tank 401 are length × width × height = 50cm × 30cm × 50cm, and the wall thickness is 2cm; a pipe opening is reserved on the side of the first water storage tank 401 near the wall-side filter facility 3, and the pipe opening is located in the middle of the bottom end of the side wall of the first water storage tank 401; the pipe opening is used to connect to the wall-side connecting water pipe 206.

[0062] The top of the drainage ditch 402 is open and covered with a rainwater grate, the top surface of which is flush with the bottom surface of the rainwater grate in the water tank. The drainage ditch 402 is 50cm long, 30cm wide, and 10cm thick at the bottom. The side walls of the drainage ditch 402 are 2cm thick. The drainage ditch pump 404 is installed on the side wall of the drainage ditch 402, and its inlet is connected to both the first water storage tank 401 and the second water storage tank 403. The first water storage tank 401 and the second water storage tank 403 are connected by a pre-buried pipe that is embedded in the middle of the bottom of the drainage ditch 402 to ensure a balance of water volume in the first water storage tank 401 and the second water storage tank 402.

[0063] The structure of the second water storage tank 403 is exactly the same as that of the first water storage tank 401, and is symmetrically arranged about the drainage ditch 402. The difference is that the pipe opening reserved on the second water storage tank 403 is connected to the roadside connecting water pipe 606 in the roadside fill 6. For the structural details of the second water storage tank 403, please refer to the description of the first water storage tank 401 above, and it will not be repeated here.

[0064] In this invention, the roadside filtration facility 5 and the wall-side filtration facility 3 have the same structure and also adopt a tiered filtration facility; wherein, the roadside filtration facility 5 and the wall-side filtration facility 3 are symmetrically arranged with respect to the water storage and drainage system 4; for the structural details of the roadside filtration facility 5, please refer to the above description of the wall-side filtration facility 3, and will not be repeated here.

[0065] In this invention, the roadside fill 6 includes a roadside fill body 601, roadside shrubs 602, roadside aquatic plants 603, roadside sprinklers 604, roadside water pumps 605, and roadside connecting water pipes 606. The roadside fill body 601 is constructed of soil and is inclinedly arranged between the roadside water storage tank 702 of the roadside water storage system 7 and the roadside filter facility 5. The side of the roadside fill body 601 closest to the roadside water storage tank 702 is higher than the side closest to the roadside filter facility 5; that is, the roadside fill body 601 is inclined downwards in the direction from the roadside water storage system 7 to the roadside filter facility 5. The side of the roadside fill body 601 closest to the roadside water storage tank 702 is lower than the roadside overflow outlet to ensure that wastewater overflowing from the roadside water storage tank 702 can enter the roadside fill body 601. Preferably, the height difference between the top surface of the side of the roadside fill body 601 closest to the roadside water storage tank 702 and the bottom edge of the roadside overflow filter screen 703 of the roadside water storage system 7 is 3 cm.

[0066] Both the roadside shrubs 602 and the roadside aquatic plants 603 are planted on the surface of the roadside fill body 601. The roadside shrubs 602 are planted on the side closer to the roadside water storage tank 702, and the roadside aquatic plants 603 are planted on the side closer to the roadside filter facility 5. It should be noted that the roadside shrubs 602 are shrubs planted on the roadside fill body 601, and the roadside aquatic plants 603 are aquatic plants planted on the upper part of the roadside fill body 601. The inlet end of the roadside water pipe 606 is connected to the second water storage tank 403 in the water storage and drainage system 4. The outlet end of the roadside water pipe 606 extends upward from the bottom surface of the roadside fill body 601 to the top surface of the roadside fill body 601 and is placed between the roadside shrubs 602 and the roadside aquatic plants 603. The inlet end of the roadside water pump 605 is connected to the outlet end of the roadside water pipe 606, and the roadside sprinkler head 604 is installed at the outlet end of the roadside water pump 605.

[0067] In this invention, a street light device is also provided on the roadside fill body 601, and the street light device is located between the roadside shrubs 602 and the roadside water storage tank 702; wherein, the street light device includes a street light body and a solar power generation device installed on the street light body; part of the electrical energy generated by the solar power generation device is used to enable the street light body to work normally, and the remaining part can be used to power the water pump and electric valve in the prefabricated wastewater treatment device.

[0068] In this invention, the road 9 is provided with a road arch so that rainwater in the area of ​​the road 9 flows towards the edge of the road 9; the roadside water storage system 7 includes a roadside baffle 701, a roadside water storage tank 702, a roadside overflow filter 703, and a roadside rain grate 704; the roadside baffle 701 is provided at the edge of the road 9 and is provided along the extension direction of the road 9; wherein, the roadside baffle 701 has water passage holes; preferably, the roadside baffle 701 has a height of 10cm, a length of 50cm, and a thickness of 5cm.

[0069] The roadside water storage tank 702 is installed on the side of the road 9. The roadside water storage tank 702 is a hollow water tank structure with an open top, and is prefabricated using concrete, polyvinyl chloride board, or stainless steel. A roadside rain grate 704 is installed at the opening of the roadside water storage tank 702. The top surface of the roadside rain grate 704 is flush with the bottom surface of the roadside water baffle 701. Preferably, the roadside water storage tank 702 has the dimensions of length × width × height = 50cm × 30cm × 50cm, and the long side of the roadside water storage tank 702 is parallel to the extension direction of the road 9. The wall thickness of the roadside water storage tank 702 is 2cm. The roadside overflow filter 703 is installed at the roadside overflow outlet. The roadside overflow filter 703 is 50cm long, 10cm high, and has a pore size of 1cm.

[0070] Construction process:

[0071] The construction process of the prefabricated wastewater treatment device of the present invention is as follows:

[0072] One end of the indoor wastewater diversion pipe 103 is passed through the exterior wall 8 of the roadside building and extended to the location of the diversion pipe reserved hole 112 on the wall-side water storage tank 102; then the other end of the indoor wastewater diversion pipe 103 is connected to the indoor wastewater pipe of the roadside building; then, one end of the sewage pipe 106 is passed through the exterior wall 8 of the roadside building and extended to the location of the sewage pipe reserved hole on the wall-side water storage tank 102; then the other end of the sewage pipe 106 is connected to the indoor sewage pipe.

[0073] Excavate the soil layer between the outer wall 8 of the roadside building and the road 9 to 1.2m below the bottom of the roadside water barrier 701. Place the water storage and drainage system 4 at the centerline between the roadside water barrier and the road 9, ensuring that the bottom of the water storage and drainage system 4 is level. Then, connect the wall-side water pipe 206 and the roadside sewage pipe 606 to the water storage and drainage system 4 respectively, and perform anti-seepage treatment at the holes. Then, backfill the soil layer to 0.77m below the bottom of the roadside water barrier 701.

[0074] Wall-side filter facility 3 and roadside filter facility 5 are installed on both sides of the water storage and drainage system 4, respectively, to ensure that the wall-side filter facility 3 and roadside filter facility 5 are tightly fitted to the water storage and drainage system 4, and to ensure that the top surface of the rainwater grate on the first water storage tank 401 and the second water storage tank 404 is 3cm lower than the bottom of the ultrafine filter plate of the cascade filter facility; then, the backfill soil layer is filled to 0.52m below the bottom of the roadside water retaining plate 701.

[0075] A wall-side water storage tank 102 is placed 3cm away from the outer wall of the roadside building to prevent the outer wall of the building from being in close contact with the wall-side water storage tank 102 and causing dampness. The reserved hole 112 of the diversion pipe on the wall-side water storage tank 101 is connected to the indoor wastewater diversion pipe 103, and the reserved hole 113 of the sewage pipe on the wall-side water storage tank 101 is connected to the sewage pipe 106. Seepage prevention treatment is done at the holes. A roadside water storage tank 702 is installed on the side close to the road 9 to ensure that the roadside water storage tank 702 is in close contact with the road 9, so that the top surface of the rain grate on the roadside water storage tank 702 is flush with the bottom surface of the roadside water baffle 701.

[0076] After installing the wall-side water storage tank 102 and the roadside water storage tank 702, backfill the soil layer, ensuring that the soil layer near the cascade filtration facility is backfilled to the interface between the upper and lower parts of the mudguard, and the soil layer near the wall-side water storage tank 102 and the roadside water storage tank 702 is backfilled to 3cm below the bottom of the filter screen; at the same time, ensure that the soil layer is arranged at an angle from the wall-side water storage tank 102 and the roadside water storage tank 702 to the cascade filtration facility, so as to form the wall-side backfill body 201 and the roadside backfill body 701; finally, plant shrubs and aquatic plants on the wall-side backfill body 201 and the roadside backfill body 701.

[0077] Working principle and wastewater treatment methods:

[0078] The prefabricated wastewater treatment device of the present invention, when used during the rainy season, introduces outdoor rainwater from the roadside building area into the wall-side water storage system 7. The outdoor rainwater then passes through the wall-side backfill 2 and the wall-side filter facility 3 before entering the water storage and drainage system 4. At the same time, wastewater from the road area flows into the roadside water storage system 7. The roadside wastewater then passes through the roadside backfill 6 and the roadside filter facility 5 before entering the water storage and drainage system 4. When used during the non-rainy season, indoor wastewater from the roadside building area is introduced into the wall-side water storage system 7. The indoor wastewater then passes through the wall-side backfill 2 and the wall-side filter facility 3 before entering the water storage and drainage system 4.

[0079] Specifically, the prefabricated wastewater treatment device includes a rainy season operating mode and a non-rainy season operating mode; the implementation process of the two operating modes is as follows:

[0080] (1) Working mode during the rainy season:

[0081] During the rainy season, rainwater from the roadside building area flows into the wall-side water storage tank 102 through the rainwater pipe 101, and rainwater from the road area 9 flows into the roadside water storage tank 702 through the roadside baffle 701. By installing a wall-side rainwater grate 110 at the top opening of the wall-side water storage tank 102 and a roadside rainwater grate 704 at the top opening of the roadside water storage tank 702, dead branches or large debris in the rainwater are prevented from entering the wall-side water storage tank 102 and the roadside area. The water storage tank 702 becomes clogged; rainwater enters the wall-side water storage tank 102 and the roadside water storage tank 702 for preliminary sedimentation; when the wastewater in the wall-side water storage tank 102 exceeds the wall-side overflow filter 111, the wastewater will flow through the wall-side backfill body 201 to the wall-side filtration facility 3; when the wastewater in the roadside water storage tank 702 exceeds the roadside overflow filter 703, the wastewater will flow through the roadside backfill body 201 to the roadside filtration facility 5.

[0082] When wastewater flows into the wall-side filtration facility 3 or the roadside filtration facility 5, it is first blocked by the mudguard 23 to prevent large clods of soil, dead branches or garbage. Then, it is filtered and purified in sequence through the gravel gabion 306, the coarse-pore filter plate 303, the crushed stone gabion 307, the fine-pore filter plate 304, the activated carbon gabion 308 and the ultra-fine filter plate 305 before entering the first water storage tank 401 or the second water storage tank 403. The inclined top surface of the filtration facility foundation 301 can accelerate the downward flow of wastewater. The coarse-pore filter plate 303 can block impurities with a particle size greater than 2cm in the wastewater. The fine-pore filter plate 304 can block impurities with a particle size greater than 1cm in the wastewater. The reverse osmosis membrane on the ultra-fine filter plate 305 can block heavy metals, pesticides and other impurities in the wastewater, so as to achieve multi-stage deep purification treatment of wastewater.

[0083] After filtration and purification, the wastewater enters the first storage tank 401 or the second storage tank 403 for storage. When the wastewater in the first storage tank 401 or the second storage tank 403 exceeds the rain grate at its top, it will overflow into the drainage ditch 402 and eventually enter the sewage pipe.

[0084] It should be noted that when the rainfall is heavy and the wastewater stored in the first reservoir 401 or the second reservoir 403 reaches the preset amount, the drainage ditch pump 404 is turned on to discharge the wastewater in the first reservoir 401 or the second reservoir 403 into the drainage ditch 402, thereby accelerating rainwater discharge and mitigating the adverse effects of heavy rain. After the rain stops, the wastewater stored in the first reservoir 401 or the second reservoir 403 can enter the wall-side fill body 201 or the road-side fill body 601 through the wall-side connecting water pipe 206 or the road-side connecting water pipe 606 to irrigate the shrubs and aquatic plants on the wall-side fill body 201 or the road-side fill body 601, ensuring the normal growth of the plants.

[0085] (2) Non-rainy season working mode:

[0086] During the non-rainy season, the wall-side water storage tank 102 does not receive rainwater from the rainwater pipe 101. At this time, the diversion pipe switch 104 and the diversion pipe electric valve 105 are turned on to divert indoor wastewater to the wall-side water storage tank 102 through the indoor wastewater diversion pipe 103. After entering the wall-side water storage tank 102, the indoor wastewater undergoes preliminary sedimentation. When the wastewater in the wall-side water storage tank 102 exceeds the wall-side overflow filter 111, the wastewater will flow through the wall-side backfill body 201 to the wall-side filtration facility 3.

[0087] When wastewater flows into the wall-side filtration facility 3, it is first blocked by mudguards 23 to prevent large clods of soil, dead branches, or garbage. Then, it is filtered and purified sequentially through gravel gabion cages 306, coarse-pore filter plates 303, crushed stone gabion cages 307, fine-pore filter plates 304, activated carbon gabion cages 308, and ultra-fine filter plates 305 before entering the first reservoir 401 or the second reservoir 403. The inclined top surface of the filtration facility foundation 301 accelerates the downward flow of wastewater. The coarse-pore filter plates 306, 307, 308, and 309 are also used for filtration. 03 can block impurities with a particle size greater than 2cm in wastewater, the fine pore filter plate 304 can block impurities with a particle size greater than 1cm in wastewater, and the reverse osmosis membrane on the ultrafine filter plate 305 can block heavy metals, pesticides and other impurities in wastewater, thus realizing multi-stage deep purification treatment of wastewater; the filtered and purified wastewater enters the first water storage tank 401 for storage; when the wastewater in the first water storage tank 401 exceeds the preset position, it will flow into the second water storage tank 403 for storage through the pre-buried pipe.

[0088] It should be noted that the opening time of the indoor wastewater drainage pipe 103 is to ensure that the water volume stored in the first and second water storage tanks 401 reaches the preset value. When there is no rain and it is necessary to irrigate the shrubs and aquatic plants on the wall-side backfill body 201 or road-side backfill body 601, the wastewater stored in the first or second water storage tank 401 can enter the wall-side backfill body 201 or road-side backfill body 601 through the wall-side connecting water pipe 206 or road-side connecting water pipe 606 to irrigate the shrubs and aquatic plants on the wall-side backfill body 201 or road-side backfill body 601 and ensure the normal growth of the plants. After the wall-side water storage tank 102 has been running for a preset period of time, the sewage pipe 106 is opened to discharge the wastewater and sediment at the bottom of the wall-side water storage tank 102 into the sewage pipe through the sewage pipe 106, thereby ensuring the normal operation of the wall-side water storage tank 102.

[0089] In this invention, outdoor rainwater and indoor wastewater from roadside buildings are collected through a wall-side water storage system, and rainwater and wastewater from the road area are collected through a roadside water storage system. The prefabricated design effectively solves the problem of limited functionality of traditional bioretention facilities during the non-rainy season, achieving year-round wastewater treatment and resource utilization. By integrating indoor and outdoor wastewater treatment systems, and fully utilizing bioretention facilities for indoor wastewater treatment and resource utilization, the efficiency of wastewater reuse is improved, and dependence on municipal pipe networks is reduced. Through multi-level cascade filtration facilities, impurities of different particle sizes in the wastewater are effectively filtered. The invention achieves efficient wastewater removal; by setting up wall-side and roadside backfill, it utilizes the organisms, soil, and plants in the natural ecosystem for wastewater purification, thus promoting sustainable ecological development while treating wastewater; the invention adopts a prefabricated design, which simplifies the construction process, shortens the construction cycle, and reduces construction costs; due to the detachable nature of the components, subsequent maintenance and upgrades are more convenient; at the same time, it can be customized according to different geographical environments and wastewater treatment needs, exhibiting excellent flexibility and adaptability; and it reduces construction costs, improves resource utilization, and lowers subsequent maintenance costs.

[0090] The prefabricated wastewater treatment device of this invention achieves efficient purification and resource utilization of wastewater. By collecting, settling, and filtering rainwater in multiple stages during the rainy season, it can effectively remove pollutants such as suspended solids, organic matter, and nutrients from the water. At the same time, rainwater resources are recycled for plant irrigation during the non-rainy season, greatly improving the efficiency of water resource utilization. In addition, the device can be converted into an indoor wastewater treatment mode during the non-rainy season to treat domestic sewage through the same purification process. This not only reduces the pressure on the municipal sewage system but also realizes the reuse of wastewater, which has significant environmental benefits.

[0091] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A prefabricated wastewater treatment device, characterized in that, The prefabricated wastewater treatment device is set between the outer wall (8) of the roadside building and the road (9), including a wall-side water storage system (1), wall-side backfill (2), wall-side filtration facility (3), water storage and drainage system (4), roadside filtration facility (5), roadside backfill (6) and roadside water storage system (7) arranged sequentially from the outer wall (8) of the roadside building to the road (9). The wall-side water storage system (1) is used to receive and store wastewater from the roadside building area; wherein, the wastewater from the roadside building area includes outdoor rainwater and indoor wastewater; the wall-side water storage system (1) is provided with a wall-side overflow outlet so that the wastewater in the wall-side water storage system (1) overflows to the wall-side backfill (2); the wall-side filtration facility (3) is used to perform graded filtration on the wastewater flowing through the surface of the wall-side backfill (2) and to allow the filtered wastewater to flow into the water storage and drainage system (4). The roadside water storage system (7) is used to receive and store wastewater from the road (9) area; wherein, the roadside water storage system (7) is provided with a roadside overflow outlet so that the wastewater in the roadside water storage system (7) overflows into the roadside fill (6); the roadside filtration facility (5) is used to perform graded filtration on the wastewater flowing over the surface of the roadside fill (6) and to allow the filtered wastewater to flow into the water storage and drainage system (4). The wall-side water storage system (1) includes a rainwater pipe (101), a wall-side water storage tank (102), an indoor wastewater diversion pipe (103), and a sewage pipe (106). The rainwater pipe (101) is vertically installed on the outside of the outer wall (8) of the roadside building; the wall-side water storage tank (102) is located on the outside of the bottom of the outer wall (8) of the roadside building and below the lower outlet of the rainwater pipe (101); the top of the outer wall of the wall-side water storage tank (102) is provided with a wall-side overflow outlet, which is located near the end of the wall-side backfill (2); One end of the indoor wastewater diversion pipe (103) is connected to the upper part of the inner wall of the wall-side water storage tank (102), and the other end of the indoor wastewater diversion pipe (103) passes through the outer wall (8) of the roadside building and is connected to the indoor wastewater pipe of the roadside building; one end of the sewage pipe (106) is connected to the bottom end of the inner wall of the wall-side water storage tank (102), and the other end of the sewage pipe (106) passes through the outer wall (8) of the roadside building and is connected to the indoor sewage pipe of the roadside building; The wall-side water storage tank (102) is located below the lower outlet of the rainwater pipe (101), and the distance between the wall-side water storage tank (102) and the outer wall (8) of the roadside building is 3cm. The wall side fill (2) includes the wall side fill body (201), wall side shrubs (202) and wall side aquatic plants (203); The wall-side backfill body (201) is constructed of soil and is arranged at an angle between the wall-side water storage system (1) and the wall-side filtration facility (3); The wall-side shrubs (202) and the wall-side aquatic plants (203) are both planted on the surface of the wall-side backfill body (201). The wall-side shrubs (202) are planted on the side closer to the wall-side water storage system (1), and the wall-side aquatic plants (203) are planted on the side closer to the wall-side filtration facility (3). The roadside fill (6) includes a roadside fill body (601), roadside shrubs (602), roadside aquatic plants (603), roadside sprinklers (604), roadside water pumps (605), and roadside connecting water pipes (606); the roadside fill body (601) is constructed of soil and is arranged at an angle between the roadside water storage tank (702) of the roadside water storage system (7) and the roadside filtration facility (5); The roadside shrubs (602) and the roadside aquatic plants (603) are both planted on the surface of the roadside fill body (601); The inlet end of the roadside connecting water pipe (606) is connected to the second water storage tank (403) in the water storage and drainage system (4). The outlet end of the roadside connecting water pipe (606) extends from the bottom surface of the roadside fill body (601) upward to the top surface of the roadside fill body (601) and is placed between the roadside shrubs (602) and the roadside aquatic plants (603). The inlet end of the roadside water pump (605) is connected to the outlet end of the roadside connecting water pipe (606). The roadside sprinkler (604) is installed at the outlet end of the roadside water pump (605). The wall-side backfill (2) also includes a wall-side sprinkler (204), a wall-side water pump (205), and a wall-side connecting water pipe (206); the inlet end of the wall-side connecting water pipe (206) is connected to the water storage and drainage system (4), and the outlet end of the wall-side connecting water pipe (206) extends upward from the bottom surface of the wall-side backfill body (201) to the top surface of the wall-side backfill body (201), and is placed between the wall-side shrubs (202) and the wall-side aquatic plants (203); the inlet end of the wall-side water pump (205) is connected to the outlet end of the wall-side connecting water pipe (206), and the wall-side sprinkler (204) is installed at the outlet end of the wall-side water pump (205); The wall-side filtration facility (3) and the roadside filtration facility (5) have the same structure and both adopt a stepped filtration facility; wherein, the stepped filtration facility includes a filtration facility foundation (301), a mudguard (302), a coarse pore filter plate (303), a fine pore filter plate (304), an ultra-fine pore filter plate (305), a gravel gabion (306), a crushed stone gabion (307), and an activated carbon gabion (308). The foundation (301) of the filter facility is set between the wall-side backfill (2) and the water storage and drainage system (4) or between the roadside backfill (6) and the water storage and drainage system (4), and the top surface of the foundation (301) is inclined. The mudguard (302), the coarse pore filter plate (303), the fine pore filter plate (304) and the ultrafine pore filter plate (305) are all vertically arranged on the top surface of the filter facility foundation (301) and are distributed at intervals from the top end of the top surface of the filter facility foundation (301) to the bottom end of the top surface. The gravel gabion (306), the crushed stone gabion (307), and the activated carbon gabion (308) are all placed above the top surface of the foundation (301) of the filtration facility.

2. The prefabricated wastewater treatment device according to claim 1, characterized in that, The side of the wall-side backfill body (201) near the wall-side water storage system (1) is higher than the side of the wall-side backfill body (201) near the wall-side filter facility (3), and the side of the wall-side backfill body (201) near the wall-side water storage system (1) is lower than the wall-side overflow outlet.

3. The prefabricated wastewater treatment device according to claim 1, characterized in that, The top of the filter facility foundation (301) is located near the wall-side fill (2) or the road-side fill (6), and the bottom of the top of the filter facility foundation (301) is located near the water storage and drainage system (4). The gravel gabion (306) is disposed between the mudguard (302) and the coarse pore filter plate (303), the crushed stone gabion (307) is disposed between the coarse pore filter plate (303) and the fine pore filter plate (304), and the activated carbon gabion (308) is disposed between the fine pore filter plate (304) and the ultrafine pore filter plate (305).

4. The prefabricated wastewater treatment device according to claim 1, characterized in that, The upper half of the mudguard (302) is uniformly provided with a first hole, the lower half of the coarse pore filter plate (303) is uniformly provided with a second hole, the lower half of the fine pore filter plate (304) is uniformly provided with a third hole, and the lower half of the ultrafine pore filter plate (305) is provided with a fourth hole.

5. The prefabricated wastewater treatment device according to claim 1, characterized in that, The water storage and drainage system (4) includes a first water storage tank (401), a drainage ditch (402) and a second water storage tank (403); the first water storage tank (401) is located near the wall-side filter facility (3) and is used to receive and store the wastewater filtered by the wall-side filter facility (3); The second water storage tank (403) is located near the roadside filtration facility (5) and is used to receive and store the wastewater filtered by the roadside filtration facility (5); the drainage ditch (402) is located between the first water storage tank (401) and the second water storage tank (403) and is used to guide the wastewater received in the first water storage tank (401) and the second water storage tank (403) to the sewage pipe.

6. The prefabricated wastewater treatment device according to claim 1, characterized in that, The roadside water storage system (7) includes a roadside water barrier (701) and a roadside water storage tank (702). The roadside water barrier (701) is set at the edge of the road (9) and along the extension direction of the road (9); wherein, the roadside water barrier (701) has a water passage hole; the roadside water storage tank (702) is set on the side of the road (9) and is flush with the bottom end of the roadside water barrier (701); wherein, the top of the outer wall of the roadside water barrier (701) is provided with a roadside overflow outlet, and the roadside overflow outlet is set near the end of the roadside fill (6).

7. A prefabricated wastewater treatment device according to claim 6, characterized in that, Both the wall-side overflow outlet and the road-side overflow outlet are equipped with filter screens.

8. A prefabricated wastewater treatment method, characterized in that, Using a prefabricated wastewater treatment device as described in any one of claims 1-7; The prefabricated wastewater treatment method includes: During the rainy season, outdoor rainwater from the roadside building area is introduced into the wall-side water storage system (1). The outdoor rainwater passes through the wall-side backfill (2) and the wall-side filtration facility (3) before entering the water storage and drainage system (4). At the same time, wastewater from the road area flows into the roadside water storage system (7). The roadside wastewater passes through the roadside backfill (6) and the roadside filtration facility (5) before entering the water storage and drainage system (4). During the non-rainy season, indoor wastewater from roadside buildings is introduced into a wall-side water storage system (1). The indoor wastewater passes through wall-side backfill (2) and wall-side filtration facilities (3) before entering the water storage and drainage system (4).

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