Multi-household combined domestic sewage treatment system

Abstract

The invention relates to the technical field of sewage treatment, and provides a multi-household combined domestic sewage treatment system which comprises a pretreatment unit, a percolation tank, a water distribution assembly and a wall scraping cleaning piece, and the percolation tank comprises a planting surface soil layer, a water distribution layer, a percolation layer and a soil treatment layer; the water distribution assembly comprises a water distribution pipe network and a driving source, the water distribution pipe network comprises a water inlet main pipe, a first water inlet pipe, a second water inlet pipe, a water distribution main pipe and water distribution branch pipes, the water inlet main pipe is communicated with the first water inlet pipe and the second water inlet pipe, the first water inlet pipe is provided with a first cut-off piece, and the second water inlet pipe is provided with a second cut-off piece; the two water distribution main pipes are arranged in a spaced mode, the first water inlet pipe is communicated with one water distribution main pipe, the second water inlet pipe is communicated with the other water distribution main pipe, the bottoms of the water distribution main pipes are communicated with slag discharging pipes, and on-off pieces are arranged at the communicating positions of the water distribution main pipes and the slag discharging pipes; the wall scraping cleaning pieces are arranged in the water distribution branch pipes in a sliding manner. According to the application, the maintenance difficulty of the water distribution system in the long-term use process can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a multi-household domestic sewage treatment system. Background Art

[0002] In mountainous and hilly areas, there are a large number of residents living scattered around core villages, and the management of domestic sewage from these scattered residents has brought considerable difficulties and challenges to local governments. As residential houses are too scattered, the traditional model of centralized treatment after collection is very expensive, and the investment in the pipeline network is seriously out of balance with the amount of sewage collected, resulting in very low investment efficiency. Currently, the "high-load underground infiltration" technology is mostly used to solve the problem of domestic sewage treatment for multiple households. High-load underground infiltration is an improved infiltration system that improves the hydraulic load capacity per unit area by optimizing the design and material selection, thereby achieving efficient sewage purification on a smaller land area.

[0003] The blockage of the water distribution system in the infiltration bed is one of the common problems in the operation of high-load underground infiltration systems. It not only affects the treatment efficiency, but may also cause the failure of the entire system. In order to solve the blockage problem of the water distribution system, a self-cleaning pipe system has been developed in the relevant technology. A cleaning brush is set in the water distribution pipe, and the water distribution pipe is cleaned by underwater mechanical drive to solve the blockage problem.

[0004] However, the cleaning brush and its drive mechanism contain multiple moving parts, which are easily worn or damaged during long-term operation, resulting in frequent replacement of parts and inconvenience in subsequent maintenance. In addition, since the working environment of the drive mechanism is humid and contains chemical substances, metal parts may be corroded, affecting the service life and performance stability of the equipment. Summary of the invention

[0005] In order to optimize the cleaning method of the water distribution system and reduce the difficulty of maintaining the water distribution system during long-term use, the present application provides a multi-household domestic sewage treatment system.

[0006] The present application provides a multi-household domestic sewage treatment system, which adopts the following technical solution: A multi-household domestic sewage treatment system, comprising: The pretreatment unit includes a grille trough, a grit chamber and a regulating tank which are connected in sequence. The infiltration tank is connected to the regulating tank, and the infiltration tank includes a planting topsoil layer, a water distribution layer, an infiltration layer and a soil treatment layer arranged from top to bottom; A water distribution component comprises a water distribution network and a driving source, wherein the water distribution network comprises a water inlet main pipe, a first water inlet pipe, a second water inlet pipe, a water distribution main pipe and a water distribution branch pipe, wherein the water inlet main pipe is connected to both the first water inlet pipe and the second water inlet pipe, the first water inlet pipe is provided with a first intercepting member, and the second water inlet pipe is provided with a second intercepting member; the water distribution main pipe and the water distribution branch pipe are arranged in the water distribution layer, and two water distribution main pipes are arranged at intervals, the first water inlet pipe is connected to one of the water distribution main pipes, and the second water inlet pipe is connected to the other water distribution main pipe. The water distribution main pipes are connected, and a slag discharge pipe is connected to the bottom of the water distribution main pipe. A switch is provided at the connection between the water distribution main pipe and the slag discharge pipe, and the switch is used to control the on and off of the water distribution main pipe and the slag discharge pipe; a plurality of water distribution branch pipes are arranged at intervals between the two water distribution main pipes; one end of the water distribution branch pipe is connected to one water distribution main pipe, and the other end is connected to another water distribution main pipe. A plurality of water distribution holes are provided on the water distribution branch pipes, and the driving source is used to drive the water in the regulating tank to flow into the water inlet main pipe; The wall scraping cleaning member is slidably arranged in the water distribution branch pipe, and comprises an elastic support frame and a wall scraping piece arranged on the peripheral side of the elastic support frame, and the wall scraping piece abuts against the inner side wall of the water distribution branch pipe.

[0007] By adopting the above technical solution, the blockage problem of the water distribution system in the high-load underground infiltration system can be effectively solved. First, by alternately inletting water through the first water inlet pipe and the second water inlet pipe, the purpose of intermittently changing the flow direction of the water flow in the water distribution branch pipe is achieved, and then the residual impurities in the water distribution branch pipe are reversely flushed. When the first water inlet pipe is used to inlet water, the on-off piece arranged near the first water inlet pipe is in a closed state, and the on-off piece arranged near the second water inlet pipe is in an open state; when the second water inlet pipe is used to inlet water, the on-off piece arranged near the second water inlet pipe is closed. The on-off piece arranged near the first water inlet pipe is in an open state. Secondly, the wall scraping cleaning piece slides along the water distribution branch pipe under the action of the water flow, driving the wall scraping piece to clean the inner wall of the water distribution branch pipe, scraping off the pollutants on the inner wall, so that they flow into the slag discharge pipe under the impact of the water flow and are discharged. This design not only improves the cleaning efficiency of the water distribution system, but also reduces the maintenance difficulty caused by the cleaning brush and its driving mechanism, and prolongs the service life and performance stability of the equipment.

[0008] Optionally, a first concentrator is provided at the connection point between the main water distribution pipe and the water distribution branch pipe, and a cross-sectional area of ​​the first concentrator gradually decreases toward the direction approaching the water distribution branch pipe.

[0009] By adopting the above technical solution, the setting of the first focusing tube can effectively reduce the turbulence and vortex phenomenon of the water flow between the water distribution main pipe and the water distribution branch pipe, and improve the stability and uniformity of the water flow; increase the water flow velocity to enhance the flushing force on the inner wall of the water distribution branch pipe when water enters, further improve the effect of backwashing, and help to remove pollutants attached to the inner wall of the water distribution branch pipe.

[0010] Optionally, a second concentrator is further provided in the water distribution branch pipe, the second concentrator comprises a narrow barrel section and expansion barrel sections provided at both ends of the narrow barrel section, and the cross-sectional area of ​​the expansion barrel section gradually decreases toward the direction approaching the narrow barrel section; The wall scraping cleaning member is disposed between the first focusing cylinder and the second focusing cylinder.

[0011] By adopting the above technical solution, the second concentrator can effectively increase the water flow speed in the water distribution branch pipe, promote the suspension and transportation of particles in the water, and reduce deposition. At the same time, the wall scraper cleaning piece is located between the first concentrator and the second concentrator, so that the wall scraper cleaning piece is more easily moved by the water flow when water enters, so as to effectively remove the dirt on the inner wall of the water distribution branch pipe, ensure the smooth flow of the water distribution system, extend the service life of the equipment, and reduce the maintenance frequency.

[0012] Optionally, a force-bearing plate is also fixed on the elastic support frame, and the force-bearing plate is arranged to be inclined relative to the length direction of the water distribution branch pipe.

[0013] By adopting the above technical solution, the setting of the force-bearing plate can effectively increase the force of the water flow on the wall-scraping cleaning element, making the wall-scraping cleaning element slide more smoothly in the water distribution branch pipe, thereby improving the cleaning effect. At the same time, the inclined force-bearing plate can guide the direction of the water flow, further enhancing the flushing force of the water flow on the inside of the water distribution branch pipe, and helping to more thoroughly remove pollutants attached to the inner wall of the water distribution branch pipe.

[0014] Optionally, the infiltration layer includes a sand and gravel filtration layer, a main infiltration layer, and a fine sand buffer layer.

[0015] By adopting the above technical solutions, the gravel filter layer can initially remove large suspended solids in sewage, reducing the burden on subsequent treatment units. The main infiltration layer, as the main treatment area, can efficiently adsorb and degrade organic matter and other harmful substances in sewage. The fine sand buffer layer plays a role in further purifying water quality, while preventing fine particles from entering the water distribution system and causing blockage.

[0016] Optionally, it also includes a temperature control component, which includes an underground heat collecting pipe, a geothermal pump and an in-pool heat exchange tube group, the underground heat collecting pipe is located below the in-pool heat exchange tube group, and the underground heat collecting pipe is connected to the in-pool heat exchange tube group, the in-pool heat exchange tube group is located in the infiltration tank, and the geothermal pump is used to drive the heat exchange medium in the underground heat collecting pipe to move toward the in-pool heat exchange tube group.

[0017] By adopting the above technical solution, the design of the temperature control component allows the geothermal energy collected by the underground heat collecting pipe to be transmitted to the heat exchange pipe group in the pool through the geothermal pump, thereby heating the water in the infiltration pool, preventing the decrease of microbial activity in the low temperature environment, and ensuring the smooth progress of the biodegradation process. At the same time, the transfer of heat can also reduce energy consumption and improve the overall economic efficiency of the system.

[0018] Optionally, the heat exchange tube group in the pool includes a heat exchange tube and a heat exchange jacket, the heat exchange jacket is arranged outside the water distribution branch pipe, and the heat exchange jacket is also provided with avoidance holes corresponding to the water distribution holes.

[0019] By adopting the above technical solution, the heat exchange jacket is installed outside the water distribution branch pipe, which can effectively increase the water temperature in the water distribution branch pipe and prevent the oil pollutants in the water distribution branch pipe from solidifying due to the low temperature in the low temperature environment, thereby avoiding the blockage problem caused by it. The design of the avoidance hole ensures the normal operation of the water distribution hole and avoids the uniformity of water distribution due to the blocking of the jacket, which not only ensures the effectiveness of temperature control, but also does not affect the normal operation of the water distribution system.

[0020] Optionally, a thermal insulation layer is provided on the inner wall of the infiltration tank.

[0021] By adopting the above technical solution, the insulation layer set on the inner wall of the infiltration tank can effectively reduce the impact of temperature changes on the internal environment of the infiltration tank, and improve the stability and treatment efficiency of the system. Especially in cold seasons, the insulation layer can prevent the temperature in the pool from being too low, which may cause the activity of microorganisms to decrease, and ensure the effective treatment of sewage.

[0022] In summary, the present application includes at least one of the following beneficial effects: 1. In the present application, the first water inlet pipe and the second water inlet pipe are alternately fed with water by the first intercepting member and the second intercepting member, so as to achieve the purpose of intermittently changing the flow direction of the water flow in the water distribution branch pipe, effectively reversely flush the residual impurities, and reduce the risk of blockage; 2. The scraper cleaning element in the water distribution branch pipe in the present application slides with the water flow, driving the scraper to clean the inner wall of the water distribution branch pipe, scraping off and removing pollutants on the inner wall, thereby improving the self-cleaning ability of the system and extending the service life of the equipment; 3. The design of the slag discharge pipe and the switch in this application enables the cleaned impurities to be discharged smoothly from the system, avoiding secondary pollution and ensuring the stable operation and processing efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a multi-household domestic sewage treatment system according to an embodiment of the present application; Figure 2 is a schematic cross-sectional structural diagram of a percolation tank in an embodiment of the present application; Figure 3 It is a schematic diagram of the cross-sectional structure of the water distribution branch pipe in the embodiment of the present application; Figure 4 yes Figure 3 A schematic diagram of the local enlarged structure at point A in the middle; Explanation of reference numerals: 1. pretreatment unit; 11. grid slot; 12. sand settling tank; 13. regulating tank; 2. infiltration tank; 21. planting topsoil layer; 22. water distribution layer; 23. infiltration layer; 231. gravel filtration layer; 232. main infiltration layer; 233. fine sand buffer layer; 24. soil treatment layer; 25. insulation layer; 3. water distribution assembly; 31. water distribution network; 311. water inlet pipe; 312. first water inlet pipe; 313. second water inlet pipe; 314. water distribution pipe; 315. water distribution Branch pipe; 3151, water distribution hole; 32, first shut-off piece; 33, second shut-off piece; 34, slag discharge pipe; 35, on-off piece; 36, driving source; 4, wall scraping cleaning piece; 41, elastic support frame; 42, wall scraping piece; 43, force plate; 5, first focusing tube; 6, second focusing tube; 61, narrow tube section; 62, expansion tube section; 7, temperature control component; 71, underground collector tube; 72, geothermal pump; 73, heat exchange tube group in the pool; 731, heat exchange tube; 732, heat exchange jacket; 7321, avoidance hole. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-4 This application is described in further detail.

[0025] An embodiment of the present application provides a multi-household domestic sewage treatment system.

[0026] Reference Figure 1 and Figure 2The multi-household domestic sewage treatment system includes a pretreatment unit 1, a percolation tank 2 and a water distribution component 3. Among them, the pretreatment unit 1 includes a grille trough 11, a grit tank 12 and a regulating tank 13 which are connected in sequence. The sewage flows into the regulating tank 13 along the grille trough 11 and the grit tank 12 in sequence to preliminarily remove large particles of impurities and suspended matter in the sewage, providing a clean water source for subsequent treatment. A planting topsoil layer 21, a water distribution layer 22, a percolation layer 23 and a soil treatment layer 24 are arranged from top to bottom in the percolation tank 2. The planting topsoil layer 21 is mainly used for planting plants to absorb water and nutrients. The water distribution layer 22 is responsible for evenly distributing sewage, and the percolation layer 23 mainly includes a sand and gravel filter layer 231, a main percolation layer 232 and a fine sand buffer layer 233, and the main percolation layer 232 is filled with filter fillers. The fillers are mostly natural or synthetic materials with good air permeability and water permeability, such as ceramsite, zeolite, coconut shell charcoal, etc., to enhance biological activity and adsorption performance, and play a role in filtering and purification. The treated sewage finally penetrates into the soil treatment layer 24 and is discharged after being thoroughly purified.

[0027] Reference Figure 1 and Figure 2 The water distribution component 3 mainly includes a water distribution network 31 and a driving source 36. The driving source 36 is specifically configured as a lifting pump, and the lifting pump is located in the regulating tank 13. The water distribution network 31 is located in the water distribution layer 22, and the water distribution layer 22 is filled with sand and gravel; the water distribution network 31 specifically includes an inlet pipe 311, a first inlet pipe 312, a second inlet pipe 313, and a water distribution pipe 314. The inlet pipe 311 is located outside the infiltration tank 2 and is connected to the driving source 36. The other end of the inlet pipe 311 is connected to the first inlet pipe 312 and the second inlet pipe 313. The first water inlet pipe 312 is provided with a first intercepting member 32, and the second water inlet pipe 313 is provided with a second intercepting member 33. In this embodiment, the first intercepting member 32 and the second intercepting member 33 are both configured as intercepting valves. Two water distribution main pipes 314 are arranged at intervals in the water distribution layer 22. The first water inlet pipe 312 is connected to one water distribution main pipe 314, and the second water inlet pipe 313 is connected to the other water distribution main pipe 314. The bottom of each water distribution main pipe 314 is connected to a plurality of slag discharge pipes 34, and a switch 35 is installed at the connection point between the water distribution main pipe 314 and the slag discharge pipe 34. The switch 35 is used to control the opening and closing of the water distribution main pipe 314 and the slag discharge pipe 34. In this embodiment, the switch 35 is specifically configured as a solenoid valve fixed on the slag discharge pipe 34. Figure 3 and Figure 4, multiple water distribution branches 315 are connected between the two water distribution main pipes 314, and the multiple water distribution branches 315 are arranged in parallel, and multiple water distribution holes 3151 are opened on the water distribution branches 315. The driving source 36 is used to drive the water in the regulating tank 13 to flow into the water inlet main pipe 311. When the driving source 36 is started, the water in the regulating tank 13 can be driven to enter the first water inlet pipe 312 or the second water inlet pipe 313 along the water inlet main pipe 311, and then flow into the water distribution main pipe 314, and then flow into the water distribution branch pipe 315, and be discharged along the water distribution holes 3151 on the water distribution branch pipe 315.

[0028] In this embodiment, the diameters of the first water inlet pipe 312 and the second water inlet pipe 313 can be selected according to specific needs to ensure sufficient flow supply. The driving source 36 is specifically configured as a lift pump located in the regulating tank 13 .

[0029] Reference Figure 4 The wall-scraping cleaning member 4 is slidably arranged in the water distribution branch pipe 315. The wall-scraping cleaning member 4 includes an elastic support frame 41 and a plurality of wall-scraping pieces 42 fixed on the periphery of the elastic support frame 41. The outer wall of the wall-scraping piece 42 is against the inner wall of the water distribution branch pipe 315. The elastic support frame 41 can be made of spring or rubber material, which has good elasticity and durability. The wall-scraping piece 42 can be made of soft plastic or nylon material, which can effectively scrape off dirt without damaging the inner wall of the pipe. A force-bearing plate 43 is also fixed in the middle of the elastic support frame 41, and the force-bearing plate 43 is inclined relative to the length direction of the water distribution branch pipe 315. This design enables the water flow to more effectively push the wall-scraping cleaning member 4 when passing through, ensuring that it slides smoothly in the pipe.

[0030] When distributing water, water is fed in alternately through the first water inlet pipe 312 and the second water inlet pipe 313, so as to achieve the purpose of intermittently changing the flow direction of water in the water distribution branch pipe 315, thereby achieving reverse flushing of residual impurities in the water distribution branch pipe 315. In addition, during the process of water inflowing into the water distribution branch pipe 315, the water flow pushes the wall scraping cleaning member 4 to slide in the water distribution branch pipe 315, driving the wall scraping piece 42 to clean the inner wall of the water distribution branch pipe 315, scraping off the pollutants on the inner wall of the water distribution branch pipe 315, so that the pollutants can flow to the slag discharge pipe 34 under the impact of water inflow.

[0031] Reference Figure 3, each water distribution main pipe 314 and the water distribution branch pipe 315 are connected with a first flow collecting tube 5. In this embodiment, the first flow collecting tube 5 is located in the pipe section of the water distribution branch pipe 315 close to one end of the water distribution main pipe 314, and the cross-sectional area of ​​the first flow collecting tube 5 gradually decreases in the direction away from the water distribution main pipe 314, which helps to increase the water flow speed and improve the cleaning effect. In this embodiment, two first flow collecting tubes 5 are arranged in one water distribution branch pipe 315. A second flow collecting tube 6 is also fixed in the middle of the water distribution branch pipe 315. The second flow collecting tube 6 includes a narrow barrel section 61 and an expanded barrel section 62 arranged at both ends of the narrow barrel section 61. The cross-sectional area of ​​the expanded barrel section 62 gradually decreases in the direction close to the narrow barrel section 61. The wall scraping cleaning member 4 is located between the first flow collecting tube 5 and the second flow collecting tube 6. When a vortex effect is formed when the water flows through, it helps to push the wall scraping cleaning member 4 to move, further enhancing the cleaning force.

[0032] Reference Figure 1 and Figure 2 In order to further improve the reliability and stability of the system, a temperature control component 7 is also added, which includes an underground heat collecting pipe 71, a geothermal pump 72 and a heat exchange pipe group 73 in the pool. The underground heat collecting pipe 71 is located below the heat exchange pipe group 73 in the pool, and the underground heat collecting pipe 71 is buried deep underground in a serpentine shape. The heat exchange pipe group 73 in the pool includes a heat exchange pipe 731 and a heat exchange jacket 732. A plurality of heat exchange pipes 731 are arranged at intervals along the height direction of the infiltration pool 2, and each heat exchange pipe 731 is arranged in a serpentine shape. A plurality of heat exchange jackets 732 are provided, and the heat exchange jackets 732 are arranged one by one with the water distribution branch pipe 315; the heat exchange jacket 732 is arranged in a cylindrical shape and is sleeved on the outside of the corresponding water distribution branch pipe 315. The heat exchange jacket 732 is also provided with an avoidance hole 7321 corresponding to the water distribution hole 3151. One end of the underground heat collecting pipe 71 is connected to the geothermal pump 72, and the other end is connected to the heat exchange pipe 731 and the heat exchange jacket 732 in the pool; the ends of the heat exchange pipe 731 and the heat exchange jacket 732 away from the underground heat collecting pipe 71 are connected to the geothermal pump 72. Starting the geothermal pump 72 can drive the heat exchange medium in the underground heat collecting pipe 71 to move toward the heat exchange pipe group 73 in the pool to achieve cyclic heat exchange.

[0033] A heat-insulating layer 25 is also fixed on the inner wall of the infiltration tank 2 to reduce heat loss and maintain the normal operation of the system.

[0034] The implementation principle of this embodiment is: when distributing water, the first water inlet pipe 312 and the second water inlet pipe 313 are controlled by the first shutoff valve and the second shutoff valve to alternately inlet water, so as to achieve the purpose of intermittently changing the flow direction of water in the water distribution branch pipe 315; thereby achieving reverse flushing of residual impurities in the water distribution branch pipe 315. When the first water inlet pipe 312 is used to inlet water, the on-off piece 35 arranged near the first water inlet pipe 312 is in a closed state, and the on-off piece 35 arranged near the second water inlet pipe 313 is in an open state; when the second water inlet pipe 313 is used to inlet water, the on-off piece 35 arranged near the second water inlet pipe 313 is in a closed state. The on-off piece 35 arranged near the first water inlet pipe 312 is in an open state. When water enters, the sewage flowing in is not easy to be discharged directly along the slag discharge pipe 34 connected to the water distribution main pipe 314, but flows along the water distribution pipe on one side to the water distribution branch pipe 315 for water distribution and then flows into the water distribution main pipe 314 on the other side, pushing the impurities to flow to the water distribution main pipe 314 on the other side and be discharged along the corresponding slag discharge pipe 34. In the process of water entering the water distribution branch pipe 315, the water flow drives the wall scraping cleaning member 4 to slide in the water distribution branch pipe 315, drives the wall scraping piece 42 to clean the inner wall of the water distribution branch pipe 315, scrapes off the pollutants on the inner wall of the water distribution branch pipe 315, and facilitates the pollutants to flow into the slag discharge pipe 34 under the impact of water inflow. This method not only reduces the wear and corrosion problems caused by the traditional cleaning brush and its driving mechanism, but also greatly reduces the difficulty and cost of later maintenance.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A multi-household domestic sewage treatment system, characterized in that: include: The pretreatment unit (1) comprises a grille slot (11), a grit chamber (12) and a regulating tank (13) which are connected in sequence. A percolation pond (2), wherein the regulating pond (13) is connected to the percolation pond (2), and the percolation pond (2) comprises a planting topsoil layer (21), a water distribution layer (22), a percolation layer (23), and a soil treatment layer (24) arranged from top to bottom; A water distribution assembly (3) comprises a water distribution network (31) and a driving source (36); the water distribution network (31) comprises a water inlet main pipe (311), a first water inlet pipe (312), a second water inlet pipe (313), a water distribution main pipe (314) and a water distribution branch pipe (315); the water inlet main pipe (311) is in communication with both the first water inlet pipe (312) and the second water inlet pipe (313); the first water inlet pipe (312) is provided with a first flow cutoff member (32); the second water inlet pipe (313) is provided with a second flow cutoff member (33); the water distribution main pipe (314) and the water distribution branch pipe (315) are arranged in the water distribution layer (22); two water distribution main pipes (314) are arranged at intervals; the first water inlet pipe (312) is in communication with one of the water distribution main pipes (314); the second water inlet pipe (313) is in communication with the second water distribution branch pipe (315); 13) is connected to another water distribution main pipe (314), the bottom of the water distribution main pipe (314) is connected to a slag discharge pipe (34), and a switch (35) is provided at the connection point between the water distribution main pipe (314) and the slag discharge pipe (34), and the switch (35) is used to control the connection and disconnection of the water distribution main pipe (314) and the slag discharge pipe (34); a plurality of water distribution branch pipes (315) are arranged at intervals between the two water distribution main pipes (314); one end of the water distribution branch pipe (315) is connected to one water distribution main pipe (314), and the other end is connected to the other water distribution main pipe (314), and a plurality of water distribution holes (3151) are provided on each of the water distribution branch pipes (315), and the driving source (36) is used to drive the water in the regulating tank (13) to flow into the water inlet main pipe (311); The wall scraping cleaning member (4) is slidably disposed in the water distribution branch pipe (315), and comprises an elastic support frame (41) and a wall scraping piece (42) disposed on the periphery of the elastic support frame (41), wherein the wall scraping piece (42) abuts against the inner wall of the water distribution branch pipe (315).

2. A multi-household domestic sewage treatment system according to claim 1, characterized in that: A first concentrator (5) is provided at the connection point between the main water distribution pipe (314) and the branch water distribution pipe (315), and the cross-sectional area of ​​the first concentrator (5) gradually decreases in a direction approaching the branch water distribution pipe (315).

3. A multi-household domestic sewage treatment system according to claim 2, characterized in that: A second concentrating tube (6) is also arranged in the water distribution branch pipe (315), the second concentrating tube (6) comprising a narrow tube section (61) and expanded tube sections (62) arranged at both ends of the narrow tube section (61), the cross-sectional area of ​​the expanded tube section (62) gradually decreasing in a direction approaching the narrow tube section (61); The wall scraping cleaning member (4) is arranged between the first focusing cylinder (5) and the second focusing cylinder (6).

4. A multi-household domestic sewage treatment system according to claim 2, characterized in that: A force-bearing plate (43) is also fixed on the elastic support frame (41), and the force-bearing plate (43) is arranged obliquely relative to the length direction of the water distribution branch pipe (315).

5. A multi-household domestic sewage treatment system according to claim 1, characterized in that: The percolation layer (23) comprises a sand and gravel filtration layer (231), a main percolation layer (232), and a fine sand buffer layer (233).

6. A multi-household domestic sewage treatment system according to claim 1, characterized in that: The invention also comprises a temperature regulating component (7), wherein the temperature regulating component (7) comprises an underground heat collecting pipe (71), a geothermal heat pump (72) and an in-pool heat exchange pipe group (73); the underground heat collecting pipe (71) is located below the in-pool heat exchange pipe group (73), and the underground heat collecting pipe (71) is connected to the in-pool heat exchange pipe group (73); the in-pool heat exchange pipe group (73) is located in the infiltration tank (2); and the geothermal heat pump (72) is used to drive the heat exchange medium in the underground heat collecting pipe (71) to move toward the in-pool heat exchange pipe group (73).

7. A multi-household domestic sewage treatment system according to claim 6, characterized in that: The in-pool heat exchange tube group (73) comprises a heat exchange tube (731) and a heat exchange jacket (732); the heat exchange jacket (732) is sleeved outside the water distribution branch pipe (315); and the heat exchange jacket (732) is further provided with avoidance holes (7321) corresponding to the water distribution holes (3151).

8. A multi-household domestic sewage treatment system according to claim 6, characterized in that: A thermal insulation layer (25) is provided on the inner wall of the infiltration tank (2).

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