Rural domestic sewage quality-divided treatment and resource utilization system and method

Abstract

The invention belongs to the technical field of environmental engineering, and particularly relates to a quality-divided treatment and resource utilization system and method for rural domestic sewage. The device is composed of a pretreatment system, a sewage treatment system and a bottom mud and excrement resource utilization system, an intelligent control device is further arranged on a water outlet pipe and composed of a water quality detection device, an intelligent valve device and a controller, the water quality detection device is used for rapidly detecting water quality, and the intelligent valve device is used for controlling the intelligent valve device to be in a closed state. The intelligent valve device is used for controlling the water outlet pipe to be communicated with the water distribution pipe / inlet pipe, and the controller is used for controlling the intelligent valve device according to a detection result of the water quality detection device; therefore, the technical problem that in the prior art, as the rest room and the bathroom of a farmer share, grey water such as bath water enters the household septic tank, the retention time of excrement in the household septic tank is less than 60 days, and the anaerobic treatment time is insufficient is solved.

Description

Technical Field

[0001] This invention belongs to the field of environmental engineering technology, specifically relating to a system and method for the differentiated treatment and resource utilization of rural domestic sewage. Background Technology

[0002] Rural domestic sewage in my country is characterized by its scattered distribution, small volume, large fluctuations in water quality, and difficulty in collection. Due to the long-standing lack of a comprehensive drainage network and treatment facilities, large amounts of sewage are directly discharged into ditches and ponds, leading to frequent problems such as black and odorous water bodies and eutrophication, seriously threatening the rural living environment and drinking water safety. In recent years, the state has attached great importance to rural sewage treatment, regarding it as an important component of ecological civilization construction, and has promoted the exploration of treatment paths suitable for local conditions in various regions.

[0003] Currently, with the nationwide "toilet revolution," most rural households have upgraded their toilets and constructed household septic tanks, using an anaerobic process to treat sewage. However, because most rural households share toilets and shower rooms, bathwater and other greywater enter the household septic tanks, resulting in insufficient retention time for fecal matter (less than 60 days) and inadequate anaerobic treatment time, leading to the outflow of large amounts of fecal sludge and other particulate matter. Furthermore, since most farmers raise livestock, livestock manure also enters the domestic sewage treatment system through pipes, impacting the normal operation of the treatment system. Summary of the Invention

[0004] The purpose of this invention is to comprehensively treat rural domestic sewage and human and animal excrement, and through rational design, provide a system and method for the differentiated treatment and resource utilization of rural domestic sewage, thereby achieving differentiated treatment and resource utilization of rural domestic sewage and excrement. This application achieves this through the following technical solution: A system for the differentiated treatment and resource utilization of rural domestic sewage comprises a pretreatment system, a sewage treatment system, and a system for the resource utilization of bottom sludge and manure. The pretreatment system consists of a pretreatment tank, a sedimentation zone, and an effluent zone. The pretreatment tank is equipped with an inlet pipe. The sedimentation zone is located on the side of the pretreatment tank with the inlet pipe and at the bottom. The effluent zone is located on the upper part of the side of the pretreatment tank without the inlet pipe. The bottom of the effluent zone is separated from the sedimentation zone by the bottom of the effluent zone. The side of the effluent zone closest to the inlet pipe is separated from the sedimentation zone by an inclined filter plate. The side of the effluent zone furthest from the inlet pipe has an effluent pipe. The bottom of the sedimentation zone has an inclined slope, and the bottom of the slope has a bottom sludge discharge outlet. The wastewater treatment system is located on one side of the pretreatment tank. The system consists of a low-concentration treatment zone and a high-concentration treatment zone. The low-concentration treatment zone is situated above the high-concentration treatment zone and separated from it by a partition. The low-concentration treatment zone comprises an anti-clogging packing layer on the partition, a packing layer on top of the anti-clogging packing layer, and a covering layer on top of the packing layer. A water distribution pipe is installed between the packing layer and the anti-clogging packing layer, with its inlet end connected to the outlet pipe. A purified water outlet is located between the packing layer and the covering layer, situated on the side of the low-concentration treatment zone furthest from the inlet pipe. The high-concentration treatment zone includes biomimetic packing suspended on the partition. An inlet pipe connecting to the outlet pipe is located on the upper part of one side of the high-concentration treatment zone, and a purified water outlet is located on the lower part of the other side. The aforementioned manure resource utilization system includes a treatment tank and a mixer. The treatment tank is a closed tank structure. A bottom sludge inlet is provided on the upper part of one side of the treatment tank, which connects to the bottom sludge discharge port. A feed ventilation pipe connecting to the inside of the treatment tank is also provided on the upper surface of the treatment tank. The mixer consists of a mixing motor and mixing blades. The mixing motor is located on one side of the treatment tank, and the mixing blades are located inside the treatment tank and driven by the mixing motor. A mixed material outlet is provided at the bottom of the other side of the treatment tank opposite to the bottom sludge inlet.

[0005] The filter plate is at an angle of 30-60 degrees to the horizontal direction.

[0006] The filler in the anti-clogging filler layer is a porous filler with a particle size of 5-8 cm; the filler in the filler layer has a particle size of 4-6 cm.

[0007] The water distribution pipe is wrapped with a geotextile layer, and water distribution holes are opened on the water distribution pipe, which are located at the top of the water distribution pipe.

[0008] A booster pump is also installed at the bottom of the water outlet area. The inlet of the booster pump is connected to the water outlet area, and the outlet of the booster pump is connected to the water outlet pipe.

[0009] The water outlet pipe is also equipped with an intelligent control device, which consists of a water quality detection device, an intelligent valve device, and a controller. The water quality detection device is used to quickly detect the water quality, the intelligent valve device is used to control the connection between the water outlet pipe and the water distribution pipe / inlet pipe, and the controller controls the intelligent valve device according to the detection results of the water quality detection device.

[0010] The porous packing material is PP porous suspended ball packing or porous spherical suspended packing, with a porosity > 99% and a specific surface area of ​​580-680 m² / m³.

[0011] The landslide is described as follows: the end of the landslide closest to the inlet pipe is the top of the slope, and the end closest to the outlet pipe is the bottom of the slope; the slope of the landslide is 1%-3%.

[0012] The biomimetic filler is a high specific surface area biomimetic filler, specifically a cluster-type habitat filler made of staggered fiber mesh, with a specific surface area of ​​800-1200 m² / m³.

[0013] This invention also provides a method for the differentiated treatment and resource utilization of rural domestic sewage, comprising the following steps: S1. Pretreatment: Rural domestic sewage enters the pretreatment tank, and after being filtered by the filter plate, the suspended solids in the influent enter the sedimentation zone, and the filtered sewage enters the effluent zone. S2. Wastewater separation: The water quality testing device analyzes the water quality in the effluent area. If the COD in the wastewater is ≥500mg / L, the controller controls the intelligent valve device to connect the effluent pipe to the inlet pipe; if the COD in the wastewater is <500mg / L, the controller controls the intelligent valve device to connect the effluent pipe to the distribution pipe; the booster pump is started, and the wastewater enters the high-concentration treatment zone or the low-concentration treatment zone. S3. Water purification: After the sewage enters the high-concentration treatment area, the high specific surface area biomimetic packing material suspended on the partition can provide a place for anaerobic microorganisms to attach, which is conducive to the anaerobic treatment of sewage. The water that meets the standards after anaerobic treatment is discharged through the clean water outlet or enters the treatment tank. After entering the low-concentration treatment zone, the wastewater is filtered through porous packing material, packing material, and soil in the cover layer to remove impurities. During the purification process, not only can water be provided to the plants in the cover layer, but the organic matter in the wastewater can also be used as nutrients to support plant growth. The water that meets the standards after treatment in the low-concentration treatment zone is discharged through the purified water outlet. S4. Resource utilization of bottom sediment: After the suspended solids in step S1 are enriched in the sedimentation zone, they sink to the bottom of the sedimentation zone as bottom sediment. Under the action of landslide, they slide towards the bottom sediment discharge outlet and enter the treatment tank through the bottom sediment inlet. Plant straw, residues and livestock manure produced in the low-concentration treatment zone are put into the treatment tank through the feed ventilation pipe. The stirring motor drives the stirring blades to rotate at a speed of 15-20 r / min, so that the materials are mixed evenly and fermented. After decomposition, they are used as farmyard manure and returned to the field through the mixed material outlet.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This application sets up a pretreatment system, in which rural domestic sewage entering the system is first filtered to remove suspended solids. On the one hand, this avoids the suspended solids from clogging the booster pump and water supply pipe. On the other hand, the filtered suspended solids enter the sedimentation zone and are further enriched and then fermented together with plant straw, residues and livestock and poultry manure and used as farmyard manure, thereby realizing resource utilization.

[0015] 2. This application incorporates an intelligent control device on the outlet pipe. This intelligent control device consists of a water quality detection device, an intelligent valve device, and a controller. The water quality detection device is used for rapid water quality testing. If the COD in the wastewater is ≥500mg / L, the controller controls the intelligent valve device to connect the outlet pipe to the inlet pipe; if the COD in the wastewater is <500mg / L, the controller controls the intelligent valve device to connect the outlet pipe to the distribution pipe. This avoids the technical problem in the prior art where, due to shared toilets and shower rooms in rural households, greywater from showers and other wastewater enters the household septic tank, resulting in a retention time of less than 60 days for fecal waste in the septic tank, thus leading to insufficient anaerobic treatment time.

[0016] 3. This application uses a controller to control an intelligent valve device to connect the outlet pipe to the inlet pipe or the distribution pipe, thus automating the entire judgment and separation process, making the entire process more time-saving and labor-saving.

[0017] 4. This application uses a process of "constructed wetland + anaerobic treatment", which has extremely low energy consumption throughout the treatment process. The stirring motor in this application is a low-speed motor with a speed of 15-20 r / min, which avoids noise pollution during the treatment of domestic sewage.

[0018] 5. In this application, the anaerobic water that meets the standards is discharged through the purified water outlet or enters the treatment pond; during the purification process in the low-concentration treatment zone, not only can water be provided to the plants in the cover layer, but the organic matter in the sewage can also be used as nutrients to supply plant growth; the water that meets the standards after treatment in the low-concentration treatment zone is discharged through the purified water outlet; throughout the process, not only can rural domestic sewage be treated to meet the standards for discharge, but it can also be treated and utilized simultaneously, further reducing treatment costs.

[0019] 6. In this application, the angle between the filter plate and the horizontal direction is 30-60 degrees, which makes it less likely for the suspended solids intercepted by the filter plate to accumulate on the filter plate and cause clogging. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. In the diagram: 1-Pretreatment tank, 2-Effluent zone, 3-Sedimentation zone, 4-Inlet pipe, 5-Bottom of effluent zone, 6-Filter plate, 7-Effluent pipe, 8-Slide slope, 9-Sludge discharge outlet, 10-Low concentration treatment zone, 11-High concentration treatment zone, 12-Baffle plate, 13-Anti-clogging packing layer, 14-Packing layer, 15-Covering layer, 16-Water distribution pipe, 17-Inlet end, 18-Purified water outlet, 19-Bionic packing, 20-Inlet pipe, 21-Purified water outlet, 22-Treatment tank, 23-Agitator, 24-Sludge inlet, 25-Feeding ventilation pipe, 231-Agitator motor, 232-Agitator blade, 26-Mixed material outlet, 27-Lift pump, 28-Water quality testing device, 29-Intelligent valve device, 30-Controller, 31-Slope top, 32-Slope bottom. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the scope of protection of the present invention is not limited by the embodiments. Example 1

[0022] A rural domestic sewage separation and resource utilization system comprises a pretreatment system, a sewage treatment system, and a bottom sludge and manure resource utilization system. The pretreatment system consists of a pretreatment tank, a sedimentation zone, and an effluent zone. The pretreatment tank is equipped with an inlet pipe. The sedimentation zone is located on the side of the pretreatment tank with the inlet pipe and at the bottom. The effluent zone is located on the upper part of the side of the pretreatment tank without the inlet pipe. The bottom of the effluent zone is separated from the sedimentation zone by the bottom of the effluent zone. The side of the effluent zone near the inlet pipe is separated from the sedimentation zone by an inclined filter plate. The side of the effluent zone away from the inlet pipe has an effluent pipe. The bottom of the sedimentation zone has an inclined slope, and the bottom of the slope has a bottom sludge discharge outlet. The sewage treatment system is located on one side of the pretreatment tank and consists of a low-concentration treatment zone and a high-concentration treatment zone. The low-concentration treatment zone is located above the high-concentration treatment zone and is separated from it by a partition. The low-concentration treatment zone consists of an anti-clogging packing layer on the partition and an anti-clogging... The system comprises a packing layer on top of a packing layer and a covering layer on top of the packing layer; a water distribution pipe is provided between the packing layer and the anti-clogging packing layer, with the inlet end of the water distribution pipe connected to the outlet pipe; a purified water outlet is provided between the packing layer and the covering layer, located on the side of the low-concentration treatment zone away from the inlet pipe; the high-concentration treatment zone includes biomimetic packing suspended on a partition; an inlet pipe connected to the outlet pipe is located on the upper part of one side of the high-concentration treatment zone, and a purified water outlet is located on the lower part of the other side; the manure resource utilization system includes a treatment tank and a mixer; the treatment tank is a closed tank structure, with a bottom sludge inlet connected to the bottom sludge discharge port on the upper part of one side of the treatment tank, and a feed ventilation pipe connected to the inside of the treatment tank on the upper surface of the treatment tank; the mixer consists of a mixing motor and mixing blades, with the mixing motor located on one side of the treatment tank and the mixing blades located inside the treatment tank and driven by the mixing motor; a mixed material outlet is located at the bottom of the other side of the treatment tank opposite to the bottom sludge inlet. The filter plate has an angle of 30 degrees with the horizontal direction. The filler in the anti-clogging filler layer is a porous filler with a particle size of 5 cm; the filler in the filler layer has a particle size of 4 cm.

[0023] The water distribution pipe is wrapped with a geotextile layer, and water distribution holes are opened on the top of the pipe. A booster pump is also installed at the bottom of the outlet area, with its inlet connected to the outlet area and its outlet connected to the outlet pipe. The outlet pipe is also equipped with an intelligent control device, which consists of a water quality detection device, an intelligent valve device, and a controller. The water quality detection device is used for rapid water quality testing, the intelligent valve device is used to control the connection between the outlet pipe and the water distribution / inlet pipe, and the controller controls the intelligent valve device based on the detection results of the water quality detection device.

[0024] The porous packing material is a porous spherical suspended packing material with a porosity > 99% and a specific surface area of ​​580 m² / m³. The landslide is defined as follows: the end near the inlet pipe is the slope crest, and the end near the outlet pipe is the slope trough; the slope of the landslide is 1%.

[0025] The biomimetic filler is a high specific surface area biomimetic filler, specifically a cluster-type habitat filler made of staggered fiber mesh, with a specific surface area of ​​800 m² / m³.

[0026] The working method of this embodiment is as follows: S1. Pretreatment: Rural domestic sewage enters the pretreatment tank, and after being filtered by the filter plate, the suspended solids in the influent enter the sedimentation zone, and the filtered sewage enters the effluent zone. S2. Wastewater separation: The water quality testing device analyzes the water quality in the effluent area. If the COD in the wastewater is ≥500mg / L, the controller controls the intelligent valve device to connect the effluent pipe to the inlet pipe; if the COD in the wastewater is <500mg / L, the controller controls the intelligent valve device to connect the effluent pipe to the distribution pipe; the booster pump is started, and the wastewater enters the high-concentration treatment zone or the low-concentration treatment zone. S3. Water purification: After the sewage enters the high-concentration treatment area, the high specific surface area biomimetic packing material suspended on the partition can provide a place for anaerobic microorganisms to attach, which is conducive to the anaerobic treatment of sewage. The water that meets the standards after anaerobic treatment is discharged through the clean water outlet or enters the treatment tank. After entering the low-concentration treatment zone, the wastewater is filtered through porous packing material, packing material, and soil in the cover layer to remove impurities. During the purification process, not only can water be provided to the plants in the cover layer, but the organic matter in the wastewater can also be used as nutrients to support plant growth. The water that meets the standards after treatment in the low-concentration treatment zone is discharged through the purified water outlet. S4. Resource utilization of bottom sediment: The suspended solids in step S1 are enriched in the sedimentation zone and sink to the bottom of the sedimentation zone as bottom sediment. Under the action of landslide, they slide towards the bottom sediment discharge outlet and enter the treatment tank through the bottom sediment inlet. Plant straw, residues and livestock manure produced in the low-concentration treatment zone are put into the treatment tank through the feed ventilation pipe. The stirring motor drives the stirring blades to rotate at a speed of 15r / min, so that the materials are mixed evenly and fermented. After decomposition, they are used as farmyard manure and returned to the field through the mixed material outlet.

[0027] The farmer, surnamed Yang, in Xuanwei City, Yunnan Province, originally used a septic tank directly connected to the toilet and bathroom. After one year of use, the COD in the treated water discharged from this system was 86-93 mg / L, far below the acceptable discharge standards. In March 2025, the farmer began constructing the system described in this example. After six months of continuous operation, the COD content in the discharged water stabilized at 31-42 mg / L, and the ammonia nitrogen content was 2.3-3.4 mg / L, consistently meeting the discharge standards. Example 2

[0028] The filter plate has a 60-degree angle with the horizontal direction. The porous filler has a particle size of 8 cm; the filler in the filler layer has a particle size of 6 cm. The porous filler is PP porous suspended ball filler with a porosity >99% and a specific surface area of ​​680 m² / m³. The slope of the landslide is 3%. The biomimetic filler is a high specific surface area biomimetic filler, specifically a cluster-type habitat filler made of staggered fiber mesh with a specific surface area of ​​1200 m² / m³.

[0029] The stirring motor drives the stirring blades to rotate at a speed of 20 r / min, so that the materials are mixed evenly and fermented. After decomposition, they are used as farmyard manure and returned to the field through the mixed material outlet. The rest is the same as in Example 1.

[0030] The technical solution of this embodiment was applied to a large-scale pig farm in Honghe Prefecture, Yunnan Province. As of the patent application date, the system had been running stably for 8 months. During operation, the highest COD content in the water discharged through the purified water outlet was 85 mg / L. After the abnormality was detected, the purified water outlet was immediately connected to the inlet pipe of the treatment tank, and the water discharged from the high-concentration treatment zone was returned to the system for further treatment. This ensured that the COD content in the water discharged through the purified water outlet after passing through the low-concentration treatment zone was stable at 39-48 mg / L, and the ammonia nitrogen content was 3.3-4.5 mg / L.

[0031] In this embodiment, radishes and cabbages were also planted on the topsoil. After 8 months, 6.3 tons of cabbage and 13.6 tons of radishes were produced, all of which were used as pig feed. Animal manure and radish and cabbage residue generated during the breeding process were fed into the processing tank. After fermentation, a total of 17.6 tons of well-rotted farmyard manure were produced. The well-rotted farmyard manure was then used as waste material in the next round of planting. Example 3

[0032] The filter plate has a 45-degree angle with the horizontal direction. The porous filler has a particle size of 6 cm; the filler in the filler layer has a particle size of 5 cm. The porous filler is PP porous suspended ball filler with a porosity >99% and a specific surface area of ​​620 m² / m³. The slope of the landslide is 2%. The biomimetic filler is a high specific surface area biomimetic filler, specifically a cluster-type habitat filler made of staggered fiber mesh with a specific surface area of ​​1000 m² / m³.

[0033] The stirring motor drives the stirring blades to rotate at a speed of 18 r / min, so that the materials are mixed evenly and fermented. After decomposition, they are used as farmyard manure and returned to the field through the mixed material outlet. The rest is the same as in Example 1.

[0034] The system of this embodiment was installed in the home of a farmer surnamed Wen in Wenshan Prefecture, Yunnan Province. After the system was running stably, the COD content of the water discharged from the purified water outlet after the low concentration treatment zone was stable at 42±5 mg / L, and the ammonia nitrogen content was 2.3-4.1 mg / L; the COD content of the water discharged from the purified water outlet after the high concentration treatment zone was stable at 45±5 mg / L, and the ammonia nitrogen content was 4.3-4.8 mg / L.

Claims

1. A system for the differentiated treatment and resource utilization of rural domestic sewage, comprising a pretreatment system, a sewage treatment system, and a system for the resource utilization of bottom sludge and manure, characterized in that, The pretreatment system consists of a pretreatment tank, a sedimentation zone, and an effluent zone. The pretreatment tank is equipped with an inlet pipe. The sedimentation zone is located on the side of the pretreatment tank with the inlet pipe and at the bottom. The effluent zone is located on the upper part of the side of the pretreatment tank without the inlet pipe. The bottom of the effluent zone is separated from the sedimentation zone by the bottom of the effluent zone. The side of the effluent zone closest to the inlet pipe is separated from the sedimentation zone by an inclined filter plate. The side of the effluent zone furthest from the inlet pipe has an effluent pipe. The bottom of the sedimentation zone has an inclined slope, and the bottom of the slope has a bottom sludge discharge outlet. The wastewater treatment system is located on one side of the pretreatment tank. The system consists of a low-concentration treatment zone and a high-concentration treatment zone. The low-concentration treatment zone is situated above the high-concentration treatment zone and separated from it by a partition. The low-concentration treatment zone comprises an anti-clogging packing layer on the partition, a packing layer on top of the anti-clogging packing layer, and a covering layer on top of the packing layer. A water distribution pipe is installed between the packing layer and the anti-clogging packing layer, with its inlet end connected to the outlet pipe. A purified water outlet is located between the packing layer and the covering layer, situated on the side of the low-concentration treatment zone furthest from the inlet pipe. The high-concentration treatment zone includes biomimetic packing suspended on the partition. An inlet pipe connecting to the outlet pipe is located on the upper part of one side of the high-concentration treatment zone, and a purified water outlet is located on the lower part of the other side. The aforementioned manure resource utilization system includes a treatment tank and a mixer. The treatment tank is a closed tank structure. A bottom sludge inlet is provided on the upper part of one side of the treatment tank, which connects to the bottom sludge discharge port. A feed ventilation pipe connecting to the inside of the treatment tank is also provided on the upper surface of the treatment tank. The mixer consists of a mixing motor and mixing blades. The mixing motor is located on one side of the treatment tank, and the mixing blades are located inside the treatment tank and driven by the mixing motor. A mixed material outlet is provided at the bottom of the other side of the treatment tank opposite to the bottom sludge inlet.

2. The rural domestic sewage separation treatment and resource utilization system according to claim 1, characterized in that, The filter plate is at an angle of 30-60 degrees to the horizontal direction.

3. The rural domestic sewage separation treatment and resource utilization system according to claim 1, characterized in that, The filler in the anti-clogging filler layer is a porous filler with a particle size of 5-8 cm; the filler in the filler layer has a particle size of 4-6 cm.

4. A rural domestic sewage treatment and resource utilization system according to claim 1, characterized in that, The water distribution pipe is wrapped with a geotextile layer, and water distribution holes are opened on the water distribution pipe, which are located at the top of the water distribution pipe.

5. A rural domestic sewage treatment and resource utilization system according to claim 1, characterized in that, A booster pump is also installed at the bottom of the water outlet area. The inlet of the booster pump is connected to the water outlet area, and the outlet of the booster pump is connected to the water outlet pipe.

6. A rural domestic sewage treatment and resource utilization system according to claim 1, characterized in that, The water outlet pipe is also equipped with an intelligent control device, which consists of a water quality detection device, an intelligent valve device, and a controller. The water quality detection device is used to quickly detect the water quality, the intelligent valve device is used to control the connection between the water outlet pipe and the water distribution pipe / inlet pipe, and the controller controls the intelligent valve device according to the detection results of the water quality detection device.

7. A rural domestic sewage separation treatment and resource utilization system according to claim 3, characterized in that, The porous packing material is PP porous suspended ball packing or porous spherical suspended packing, with a porosity > 99% and a specific surface area of ​​580-680 m² / m³.

8. A rural domestic sewage separation treatment and resource utilization system according to claim 1, characterized in that, The landslide is described as follows: the end of the landslide closest to the inlet pipe is the top of the slope, and the end closest to the outlet pipe is the bottom of the slope; the slope of the landslide is 1%-3%.

9. A rural domestic sewage separation treatment and resource utilization system according to claim 1, characterized in that, The biomimetic filler is a high specific surface area biomimetic filler, specifically a cluster-type habitat filler made of staggered fiber mesh, with a specific surface area of ​​800-1200 m² / m³.

10. A method for the differentiated treatment and resource utilization of rural domestic sewage, characterized in that, Includes the following steps: S1. Pretreatment: Rural domestic sewage enters the pretreatment tank, and after being filtered by the filter plate, the suspended solids in the influent enter the sedimentation zone, and the filtered sewage enters the effluent zone. S2. Wastewater separation: The water quality testing device analyzes the water quality in the effluent area. If the COD in the wastewater is ≥500mg / L, the controller controls the intelligent valve device to connect the effluent pipe to the inlet pipe. If the COD in the wastewater is <500mg / L, the controller controls the intelligent valve device to connect the effluent pipe to the distribution pipe, starts the booster pump, and the wastewater enters the high-concentration treatment area or the low-concentration treatment area. S3. Water purification: After the sewage enters the high-concentration treatment area, the high specific surface area biomimetic packing material suspended on the partition can provide a place for anaerobic microorganisms to attach, which is conducive to the anaerobic treatment of sewage. The water that meets the standards after anaerobic treatment is discharged through the clean water outlet or enters the treatment tank. After entering the low-concentration treatment zone, the wastewater is filtered through porous packing material, packing material, and soil in the cover layer to remove impurities. During the purification process, not only can water be provided to the plants in the cover layer, but the organic matter in the wastewater can also be used as nutrients to support plant growth. The water that meets the standards after treatment in the low-concentration treatment zone is discharged through the purified water outlet. S4. Resource utilization of bottom sediment: The suspended solids in step S1 are enriched in the sedimentation zone and then sink to the bottom of the sedimentation zone as bottom sediment. Under the action of landslide, they slide towards the bottom sediment discharge outlet and enter the treatment tank through the bottom sediment inlet. Plant straw, residues, and livestock manure generated in the low-concentration treatment zone are fed into the treatment tank through the feed ventilation pipe. The stirring motor drives the stirring blades to rotate at a speed of 15-20 r / min, so that the materials are mixed evenly and fermented. After decomposition, they are used as farmyard manure and returned to the field through the mixed material outlet.

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