Zero-emission resourceful sewage collection and treatment system and method

Abstract

This invention discloses a zero-discharge, resource-based wastewater collection system and method, comprising a negative pressure collection component, a negative pressure conveying pipeline, a vacuum pump station, a greywater biochemical treatment component, and a blackwater and domestic waste co-treatment component. The negative pressure collection component includes a first negative pressure blackwater collection component and a first negative pressure greywater collection component; the negative pressure conveying pipeline includes a greywater negative pressure conveying pipeline and a blackwater negative pressure conveying pipeline; and the vacuum pump station includes a second negative pressure blackwater collection component and a second negative pressure greywater collection component. Greywater passes through the first negative pressure greywater collection component, the greywater negative pressure conveying pipeline, and the second negative pressure greywater collection component before entering the greywater biochemical treatment component. Blackwater passes through the first negative pressure blackwater collection component, the blackwater negative pressure conveying pipeline, and the second negative pressure blackwater collection component before entering the blackwater and domestic waste co-treatment component. This invention can separate blackwater and greywater at the source, achieving complete collection, complete treatment, zero discharge, resource recovery, and sustainable management of rural wastewater.

Description

Technical Field

[0001] This invention belongs to the field of wastewater collection and treatment technology, specifically relating to a zero-discharge, resource-efficient wastewater collection and treatment system and method. Background Technology

[0002] Rural sewage volumes are low, drainage is scattered, and water volume fluctuates greatly. Rural roads are rugged and narrow, limiting construction space. However, rural sewage collection systems typically still use urban gravity drainage systems. Gravity drainage systems have large-diameter collection pipes, deep burial depths, are difficult to construct, and have high investment costs. During normal drainage, the shallow slope and low filling degree cause sedimentation and sedimentation, and there are serious problems of leakage, posing a risk of sewage migration and pollution. The subsequent operation, maintenance, and cleaning of gravity pipe networks are difficult and costly. Gravity pipe systems are often only completed on main roads and cannot reach individual households, thus failing to achieve 100% sewage collection. Rural sewage end-of-pipe treatment facilities are often neglected due to difficulties in water collection and operation and maintenance, resulting in serious investment waste and the risk of sewage overflow and pollution.

[0003] Researchers have conducted corresponding studies to address the above issues. On one hand, they have modified gravity drainage systems into outdoor vacuum drainage systems, while also making improvements to septic tank collection, vacuum pump stations, and vacuum drainage pipes. For example, patent CN109944313A discloses an outdoor vacuum drainage system for domestic sewage. This system mainly consists of a septic tank collection box, vacuum drainage pipes and control valves, an underground vacuum tank, and an underground prefabricated vacuum pump station. It combines the flow conversion function of the vacuum collection box with the interception function of traditional household septic tanks to prevent large pieces of waste from entering the pipe network. Simultaneously, the vacuum pump station's form has been changed from the traditional above-ground + underground type to an underground prefabricated pump station. Furthermore, the deodorizing biological filter at the vacuum pump exhaust pipe outlet has been replaced with an ozone deodorization device located within the vacuum pump station.

[0004] On the other hand, designs and improvements have also been made for the collection, transportation, and treatment of sewage. For example, patent CN213897352U discloses a negative pressure source separation drainage system, including: a negative pressure toilet, employing a negative pressure drainage method, equipped with a negative pressure drain pipe connected to a black water negative pressure pipeline; a black water negative pressure collector, employing a negative pressure drainage method, equipped with a negative pressure drain pipe connected to a black water negative pressure pipeline and a black water inlet for receiving black water; a grey water source, employing a gravity flow drainage method, equipped with a gravity flow drain pipe connected to the grey water negative pressure collector; a grey water negative pressure collector, employing a negative pressure drainage method, equipped with a negative pressure drain pipe connected to a grey water negative pressure pipeline and a grey water inlet for receiving grey water; a black water negative pressure pipeline, used to transport black water using negative pressure as power, with its output end connected to the black water negative pressure facility of a negative pressure station; and a grey water negative pressure pipeline, used to transport grey water using negative pressure as power, with its output end connected to the grey water negative pressure facility of a negative pressure station. This system separates domestic sewage into black water and grey water at the source, transports them separately, and performs differentiated treatment. For example, patent CN114230091A discloses a rural drainage and pollution control resource recycling system, including: a sewage classification and collection module, which is connected to a sewage pretreatment module, for classifying and collecting sewage through sewage pipelines and discharging the collected sewage to the sewage pretreatment module; a sewage pretreatment module, which is connected to the sewage classification and collection module and the sewage solid-liquid separation module, for receiving sewage transmitted from the sewage classification and collection module, pretreating the sewage, removing impurities from the sewage, and then transmitting it to the sewage solid-liquid separation module; and a sewage solid-liquid separation module, which is connected to the sewage pretreatment module and the biochemical module.

[0005] However, none of the existing technologies mentioned above consider the issues of zero discharge from on-site treatment, or the resource and energy recovery from on-site treatment of wastewater. Their approach to wastewater treatment and utilization is rather one-sided, failing to achieve integrated management from source to subsequent treatment.

[0006] Therefore, how to design a wastewater collection and treatment system to achieve zero discharge and resource recovery of wastewater is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] To address the shortcomings of the existing technologies, this invention provides a zero-discharge, resource-based wastewater collection and treatment system and method. By incorporating a negative pressure collection component, a negative pressure conveying pipeline, a vacuum pump room, a greywater biochemical treatment component, and a blackwater and municipal solid waste co-treatment component, and by designing the negative pressure collection component and the negative pressure greywater component in the vacuum pump room to intercept impurities and deodorize, and by integrating the greywater biochemical treatment component with the blackwater and municipal solid waste co-treatment component, this system can achieve complete collection, treatment, zero discharge, resource recovery, and sustainable treatment of blackwater and greywater from the source, realizing zero discharge and resource recovery in wastewater treatment.

[0008] In a first aspect, the present invention provides a zero-emission resource-based wastewater collection and treatment system, comprising: a negative pressure collection component, a negative pressure conveying pipeline, a vacuum pump room, a greywater biochemical treatment component, and a blackwater and domestic waste co-treatment component;

[0009] The negative pressure collection component includes a first negative pressure black water collection component and a first negative pressure grey water collection component; the negative pressure conveying pipeline includes a grey water negative pressure conveying pipeline and a black water negative pressure conveying pipeline; and the vacuum pump room includes a second negative pressure black water collection component, a second negative pressure grey water collection component, and a deodorization component.

[0010] Grey water sequentially passes through the first negative pressure grey water collection component, the grey water negative pressure conveying pipeline, and the second negative pressure grey water collection component before entering the grey water biochemical treatment component. Black water sequentially passes through the first negative pressure black water collection component, the black water negative pressure conveying pipeline, and the second negative pressure black water collection component before entering the black water and municipal solid waste co-processing component.

[0011] The first negative pressure grey water collection component includes an outdoor buried grey water storage tank. The outdoor buried grey water storage tank is equipped with a screenings basket that is connected to the side wall of the tank by a lifting ring. The screenings basket is used to intercept impurities in the grey water.

[0012] The greywater biochemical treatment unit is connected to the blackwater and municipal solid waste co-treatment unit. The sludge from the greywater biochemical treatment unit is discharged to the blackwater and municipal solid waste co-treatment unit, and the supernatant from the blackwater and municipal solid waste co-treatment unit is discharged to the greywater biochemical treatment unit.

[0013] Furthermore, the first negative pressure ash water collection assembly also includes an ash water vacuum collector, which includes a control cabinet and a vacuum valve;

[0014] The upper end of the outdoor underground ash water storage tank is equipped with an inspection port, and the inspection port is equipped with a manhole cover that is flush with the outdoor underground ash water storage tank. Hooks are distributed on both sides of the inspection port.

[0015] The screenings basket is suspended at the front end of the outdoor buried ash water storage tank. The screenings basket has a gap of ≤5mm. The outdoor buried ash water storage tank is also equipped with a float rod. The rod of the float rod passes through the outdoor buried ash water storage tank and protrudes. The float part of the float rod floats on the ash water liquid surface in the outdoor buried ash water storage tank. The upper and lower parts of the rod are coated with different colors.

[0016] The outdoor buried grey water storage tank is equipped with a water collection pit at its end. The inlet end of the grey water negative pressure conveying pipeline extends into the water collection pit and is equipped with a water suction bell mouth with a filter screen and a support. The outlet end of the grey water negative pressure conveying pipeline is connected to a grey water vacuum collector. If the lower part of the rod protrudes through the outdoor buried grey water storage tank, the control cabinet controls the vacuum valve to draw the grey water from the outdoor buried grey water storage tank into the second negative pressure grey water collection component through the water suction bell mouth.

[0017] Furthermore, the negative pressure conveying pipeline is equipped with an outdoor valve well, a lifting and maintenance well, and an end maintenance well in sequence, with the distance between two adjacent lifting and maintenance wells ≤400m.

[0018] Furthermore, the second negative pressure greywater collection assembly also includes a vacuum greywater storage tank, a pressure relief tank, an air vacuum pump, a sewage pump, a control valve, and a check valve;

[0019] The end of the negative pressure conveying pipeline is connected to the upper side of the vacuum ash water storage tank. The top of the vacuum ash water storage tank is connected to one end of the suction pipe, the other end of the suction pipe is connected to the air inlet of the air vacuum pump, the air outlet of the air vacuum pump is connected to one end of the exhaust pipe, the other end of the exhaust pipe is connected to the top of the pressure relief tank, the top of the pressure relief tank is also connected to one end of the odor collection pipe, and the other end of the odor collection pipe is connected to the deodorization component.

[0020] The bottom of the pressure relief tank is connected to one end of the vacuum pump water supply pipe, the other end of the vacuum pump water supply pipe is connected to the air vacuum pump, the side wall of the pressure relief tank is connected to one end of the overflow pipe, the other end of the overflow pipe is connected to the grey water biochemical treatment component, and the lower part of the pressure relief tank is provided with a water inlet for water replenishment.

[0021] The bottom of the vacuum grey water storage tank is connected to a sewage pump via a suction pipe. The sewage pump transports the grey water in the vacuum grey water storage tank to the grey water biochemical treatment unit.

[0022] The vacuum ash water storage tank has a pressure tolerance range of -0.1MPa to 1.0MPa, and the ash water capacity of the vacuum ash water storage tank does not exceed 1 / 2 of the total volume.

[0023] Furthermore, the co-treatment component for black water and domestic waste includes a pretreatment component, an anaerobic fermentation reactor, a biogas collection and purification component, and a biogas residue organic fertilizer preparation component. The biogas produced by the anaerobic fermentation reactor enters the biogas collection and purification component, and the end of the anaerobic fermentation reactor is connected to the biogas residue organic fertilizer preparation component. The pretreatment component includes a pre-processing waste crushing device, an oil-water separation device, and a sand removal device.

[0024] The greywater biological treatment component includes a regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, an MBR membrane tank, a clear water tank, and a tailwater pump connected in sequence. It also includes a dosing component, a blower, and a sludge pump. The dosing component adds disinfectant to the clear water tank and phosphorus removal agent to the MBR membrane tank. The blower is used to aerate the aerobic tank and the MBR membrane tank.

[0025] The sludge pump is connected to the settling zone at the end of the MBR membrane tank via a sludge suction pipe, and discharges the remaining sludge in the MBR membrane tank into the anaerobic fermentation reactor. The anaerobic fermentation reactor is connected to the equalization tank, which is used to discharge the supernatant into the equalization tank.

[0026] Furthermore, the anaerobic fermentation reactor includes a feed well, a black water inlet pipe, an anaerobic fermentation tank, and a discharge well. Motor maintenance wells are located on both sides of the feed well. A crusher / agitator is installed inside the feed well, and the drive motor for the crusher / agitator is located within the motor maintenance well. The bottom of the feed well is connected to one side of the anaerobic fermentation tank via a feed pipe. The feed pipe has an angle of 30° to the horizontal direction and a diameter ≥300mm.

[0027] The diameter of the black water inlet pipe is ≥100mm. The black water inlet pipe is connected to the bottom of the anaerobic fermentation tank and extends along the inner bottom surface of the anaerobic fermentation tank. The distance between the central axis of the black water inlet pipe and the inner bottom surface of the anaerobic fermentation tank is 200-300mm. The part of the black water inlet pipe located inside the anaerobic fermentation tank has several pairs of water distribution holes distributed along its axial direction. The same pair of water distribution holes are located on the same radial section. Each water distribution hole faces the inner bottom surface of the anaerobic fermentation tank at 40-50°. The diameter of the water distribution hole is 15-25mm.

[0028] The other side of the anaerobic fermentation tank is connected to the discharge well through a discharge pipe. The angle between the discharge pipe and the horizontal direction is 10-20°, and the diameter of the discharge pipe is ≥300mm.

[0029] Furthermore, the upper part of the anaerobic fermentation tank is a square solid-liquid-gas separation zone, and the lower part is a square reaction zone. The upper part is inverted cone-shaped, and a conical air guide tube is suspended on the upper part. The conical air guide tube is fixed to the upper part of the anaerobic fermentation tank by radially inserted expansion bolts. The upper part of the anaerobic fermentation tank and the outer corner of the conical air guide tube are fixed by welding. The conical air guide tube is connected to the biogas collection and purification components.

[0030] The square reaction zone is equipped with a tilted double-blade agitator with an angle of 20-30° to the horizontal direction. The double-blade agitator is fixed by embedded iron pre-embedded in the inner and outer walls of the anaerobic fermentation tank.

[0031] The square solid-liquid separation zone is equipped with an effluent triangular weir and an effluent channel surrounding the effluent triangular weir. The supernatant flows into the effluent channel through the effluent triangular weir and then flows to the regulating water tank through the discharge pipe at the bottom of the effluent channel. A slag-blocking skirt is installed below the inner wall of the effluent triangular weir. The angle between the slag-blocking skirt and the vertical direction is 40-60°. The upper end of the slag-blocking skirt is fixedly connected by an L-shaped screw pre-embedded in the inner wall of the anaerobic fermentation tank. The lower end of the slag-blocking skirt rests on the inner end of a horizontal support rod. The outer end of the horizontal support rod is fixed to the inner wall of the anaerobic fermentation tank. Both the L-shaped screw and the outer end of the horizontal support rod are fixed with pre-embedded iron pre-embedded in the inner wall of the anaerobic fermentation tank.

[0032] Furthermore, the second negative pressure black water collection component includes a vacuum pump, a black water buffer tank, and a discharge pipeline. The end of the black water negative pressure delivery pipeline is connected to the upper part of the black water buffer tank. The vacuum pump is installed on the top of the black water buffer tank and is connected to the discharge pipeline. If the black water in the black water buffer tank reaches the threshold height, the vacuum pump discharges the black water through the discharge pipeline into the black water and domestic waste co-processing component.

[0033] Furthermore, the black water buffer tank is equipped with a cleaning port on the side wall, and an intercepting screen is installed 50-1000mm below the cleaning port, with the intercepting screen extending horizontally along the black water buffer tank.

[0034] Secondly, the present invention also provides a zero-emission resource-based wastewater collection and treatment method, employing the aforementioned wastewater collection and treatment system, comprising the following steps:

[0035] S1: The vacuum pump room evacuates air from the gray water negative pressure conveying pipeline and the black water negative pressure conveying pipeline to form negative pressure in the pipeline;

[0036] S2: Under the action of gravity, the ash water flows into the first negative pressure ash water collection component. When the first negative pressure ash water collection component continuously collects ash water and reaches the first predetermined threshold, it transports the ash water to the second negative pressure ash water collection component.

[0037] The black water enters the second negative pressure black water collection component under the continuous suction of the first negative pressure black water collection component;

[0038] S3: When the second negative pressure ash water collection component continues to collect ash water, the deodorization component continues to collect the gas emitted by the second negative pressure ash water collection component. When the second negative pressure ash water collection component continuously collects ash water to the second predetermined threshold, it stops collecting ash water and transports the ash water to the ash water biochemical treatment component. When the ash water in the second negative pressure ash water collection component is emptied, the collection operation is repeated.

[0039] When the second negative pressure black water collection component continuously collects black water and reaches the third predetermined threshold, it will transport the black water to the black water and municipal solid waste co-processing component.

[0040] S4: The grey water biological treatment unit performs biological reaction, filtration and disinfection treatment on grey water in sequence, and discharges the remaining sludge of the grey water biological treatment unit to the black water and domestic waste co-treatment unit;

[0041] The co-treatment unit for black water and municipal solid waste performs anaerobic fermentation on the residual sludge from the black water and / or grey water biochemical treatment unit, and discharges the supernatant formed by anaerobic fermentation to the grey water biochemical treatment unit for biochemical treatment.

[0042] The present invention provides a zero-emission resource-based wastewater collection and treatment system and method, which has at least the following beneficial effects:

[0043] (1) By setting up negative pressure collection components, negative pressure conveying pipelines, vacuum pump rooms, grey water biochemical treatment components and black water and domestic waste co-treatment components, and designing the negative pressure collection components and the negative pressure grey water components in the vacuum pump room to intercept impurities and deodorize, and connecting the grey water biochemical treatment components with the black water and domestic waste co-treatment components in an integrated design, it is possible to achieve full collection, full treatment, zero discharge, resource utilization and sustainable treatment of black water and grey water from the source, and realize zero discharge and resource utilization of sewage treatment.

[0044] (2) Adopt impact-resistant and low-maintenance sewage treatment technology to solve the problems of "difficulty in hiring", "difficulty in stabilizing" and "difficulty in finding funding" for sewage treatment facilities.

[0045] (3) The anaerobic fermentation reactor is equipped with a feed crusher and agitator, which solves the problem of large pieces of garbage in black water clogging and wear on the equipment and improves fermentation efficiency; the bottom perforated water distribution and bottom-up water intake method can improve the solid-liquid contact time and improve fermentation efficiency; at the same time, the water distribution at a downward angle of 40-50° can also avoid siltation at the bottom of the anaerobic fermentation reactor and improve the volume utilization rate; the inclined double-blade agitator makes the solid organic matter more uniformly mixed and stirred, and the thrust generated by the agitation is conducive to the material flowing out from the discharge pipe, realizing low-energy automated discharge and reducing the intensity of manual cleaning; the anaerobic fermentation reactor is buried underground, which can reduce the ground structure, improve the aesthetics, improve the heat preservation effect, reduce the additional external energy consumption for heat preservation, and ensure high fermentation efficiency. Attached Figure Description

[0046] Figure 1 A process flow diagram of a zero-emission resource-based wastewater collection and treatment system provided by the present invention;

[0047] Figure 2 A schematic diagram of a vacuum pump room according to one embodiment of the present invention;

[0048] Figure 3 A schematic diagram of the manual control structure of an outdoor buried greywater storage tank according to a certain embodiment of the present invention;

[0049] Figure 4 A schematic diagram of a second negative pressure greywater collection assembly according to a certain embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the structure of an anaerobic fermentation reactor according to one embodiment of the present invention;

[0051] Figure 6 A top view of the feed well according to one embodiment of the present invention;

[0052] Figure 7 A schematic diagram of the installation of a conical air guide tube according to a certain embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of the structure for fixing the slag-blocking skirt according to one embodiment of the present invention;

[0054] Figure 9 This is a schematic diagram of the structure of a water distribution hole according to one embodiment of the present invention;

[0055] Figure 10 A flowchart of a zero-emission resource-based wastewater collection and treatment method provided by the present invention.

[0056] Explanation of reference numerals in the attached figures:

[0057] 1. Integrated negative pressure toilet; 2. Outdoor buried greywater storage tank; 201. Slag basket; 202. Hook; 203. Hanging ring; 204. Float rod; 205. Suction bell mouth; 206. Manhole cover; 3. Greywater vacuum collector; 301. Control cabinet; 302. Vacuum valve; 4. Outdoor valve well; 5. Lifting and maintenance well; 6. End maintenance well; 7. Greywater negative pressure conveying pipeline; 8. Blackwater negative pressure conveying pipeline; 9. Vacuum pump room; 10. Second negative pressure greywater collection assembly; 101. Vacuum greywater storage tank; 102. Air vacuum pump; 103. Sewage pump; 11. Second negative pressure blackwater collection assembly; 111. Vacuum pump; 112. Blackwater buffer tank; 12. Solar panel; 13. Deodorization assembly; 14. Greywater biochemical treatment assembly; 141. Adjusting water tank; 142. Anaerobic tank; 143. 144. Aerobic Tank, 145. MBR Membrane Tank, 146. Clear Water Tank, 147. Tailwater Pump, 148. Dosing Components, 149. Blower, 1410. Sludge Pump, 15. Black Water and Municipal Solid Waste Co-treatment Components, 151. Pretreatment Components, 152. Anaerobic Digester, 1521. Feed Well, 1522. Motor Inspection Well, 1523. Crusher / Agitator, 1524. 1525 Feed pipe, 1526 Black water inlet pipe, 1527 Anaerobic fermentation tank, 1528 Double-blade agitator, 1529 Conical air guide tube, 1520 Slag-blocking skirt, 1531 Discharge well, 1532 Discharge pipe, 1533 Horizontal support rod, 1534 L-shaped screw, 1535 Water distribution hole, 1536 Biogas collection and purification component, 1547 Biogas residue organic fertilizer preparation component. Detailed Implementation

[0058] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0059] like Figure 1 and Figure 2As shown, this invention relates to a zero-emission, resource-efficient, sustainable rural wastewater collection and treatment system, comprising: a negative pressure collection component, a negative pressure conveying pipeline, a vacuum pump station 9, a greywater biochemical treatment component 14, and a blackwater and domestic waste co-treatment component 15; the negative pressure collection component includes a first negative pressure blackwater collection component and a first negative pressure greywater collection component, the negative pressure conveying pipeline includes a greywater negative pressure conveying pipeline 7 and a blackwater negative pressure conveying pipeline 8, and the vacuum pump station 9 includes a second negative pressure blackwater collection component 11, a second negative pressure greywater collection component 10, and a deodorization component 13; greywater sequentially passes through the first negative pressure greywater collection component, the greywater negative pressure conveying pipeline 7, and the second negative pressure greywater collection component 10 before entering the greywater biochemical treatment component 14, and blackwater sequentially passes through the first negative pressure blackwater collection component, the blackwater negative pressure conveying pipeline 8, and the second negative pressure blackwater collection component 11 before entering the blackwater and domestic waste co-treatment component 15.

[0060] The first negative pressure black water collection component includes an integrated negative pressure toilet 1; the first negative pressure grey water collection component includes an outdoor underground grey water storage tank 2 and a grey water vacuum collector 3, the grey water vacuum collector 3 includes a control cabinet 301 and a vacuum valve 302; both the grey water negative pressure conveying pipeline 7 and the black water negative pressure conveying pipeline 8 are equipped with an outdoor valve well 4, a lifting maintenance well 5, and an end maintenance well 6; the vacuum pump room also includes a solar panel 12.

[0061] The second negative pressure grey water collection component 10 and the second negative pressure black water collection component 11 of the system pre-extract air from the grey water negative pressure conveying pipe 7 and the black water negative pressure conveying pipe 8 to form negative pressure in the pipes. The grey water generated by the residents (mainly including kitchen wastewater, washing and bathing wastewater, and laundry wastewater) flows into the outdoor buried grey water storage tank 2 by gravity. When the liquid level of the outdoor buried grey water storage tank 2 rises to the highest level, the grey water vacuum collector 3 starts and opens the vacuum valve 302. Under the action of negative pressure suction, the grey water is transported to the second negative pressure grey water collection component 10. The black water generated by the integrated negative pressure toilet 1 is continuously sucked to the second negative pressure black water collection component 11. In order to prevent debris from clogging, the inlet diameter of the integrated negative pressure toilet 1 is 28mm.

[0062] To ensure the safe and stable operation of the system, the negative pressure pipeline transportation system (including the grey water negative pressure transportation pipeline 7 and the black water negative pressure transportation pipeline 8) uses pressure-bearing pipes and fittings with a pressure rating standard ≥1.0MPa, and should have the ability to withstand negative pressure ≥-0.09MPa. Preferably, corrosion-resistant PE pipes are used as the main material, and the connections are made by electrofusion. Figure 2As shown, the negative pressure pipeline transportation system is equipped with an outdoor valve well 4, a lifting inspection well 5, and an end inspection well 6. One outdoor valve well 4 is set up according to a certain proportion of the residents' collection range. An inspection well is set up upstream of the branch pipe's connection to the main pipe. An inspection well should be set up when the straight pipeline length is >400m. The negative pressure pipeline should flexibly adopt "zigzag" or "bag-shaped" laying methods according to different terrains and the depth of the local frost layer. When the negative pressure pipeline is partially lifted, it should be partially settled before being lifted to the required height, i.e., a U-shaped setting between two lifting bends, and an inspection pipe leading to the ground should be installed at each lifting bend or U-shaped pipe. The pipeline slope between two adjacent lifting sections should not be less than 0.2%, and the distance should not be less than 6m and not more than 100m. The lifting section consists of two 45° elbows and a short straight pipe. The longitudinal deflection of the pipeline with respect to the horizontal axis should preferably be greater than 45°. The negative pressure pipeline transportation system should ensure that the pipeline interior is smooth, and 45° oblique tees are used at the connections.

[0063] like Figure 3 As shown, the grey water generated by the residents is discharged by gravity through the discharge pipe from the upper side of the outdoor underground grey water storage tank 2; a small screenings basket 201 is installed inside the outdoor underground grey water storage tank 2 to intercept impurities in the grey water, and the screenings basket 201 has a screenings gap of ≤5mm; the screenings basket 201 is connected to hooks 202 fixed on both sides of the inspection port of the outdoor underground grey water storage tank 2 by a lifting ring 203; a PE manhole cover 206 is installed on the inspection port, and the top of the manhole cover 206 is flush with the ground; a local water collection pit is set at the end of the outdoor underground grey water storage tank 2 to facilitate negative pressure water suction. The negative pressure conveying pipeline 7 for grey water extends from the top of the end of the outdoor underground grey water storage tank 2 into a local sump. One end of the grey water negative pressure conveying pipeline 7 in the local sump is equipped with a suction bell 205 and a support. The support is 150-300mm high, and a filter screen is welded to the suction bell 205. A grey water vacuum collector 3 is installed on the grey water negative pressure conveying pipeline 7 near the outdoor underground grey water storage tank 2. The grey water vacuum collector 3 consists of a control cabinet 301 and a vacuum valve 302, and can be configured with manual or electric control as needed. The control cabinet 301 is placed on the ground, and the vacuum valve 302 is located in an underground valve well. The inlet diameter of the vacuum valve 302 is 38mm. In manual control, the outdoor buried grey water storage tank 2 is equipped with a float rod 204. The length of the float rod 204 is the same as the depth of the outdoor buried grey water storage tank 2. Its upper part is black and its lower part is red. As the liquid level in the outdoor buried grey water storage tank 2 rises, the float rod 204 gradually extends out of the ground due to buoyancy. When the alarm volume of the outdoor buried grey water storage tank 2 is reached, the part of the float rod 204 that extends out of the ground turns red. At this time, the button in the control cabinet 301 is pressed manually to start and open the vacuum valve 302 to perform negative pressure suction of the grey water in the outdoor buried grey water storage tank 2. As the float rod descends to a safe height, the button can be released to close the vacuum valve 302, and the negative pressure suction stops.

[0064] like Figure 2 As shown, the second negative pressure black water collection component 11 consists of a vacuum pump 111, a black water buffer tank 112, and a discharge pipeline. The black water negative pressure conveying pipeline 8 is connected to the upper part of the black water buffer tank 112. After the black water enters the black water buffer tank 112 and reaches a certain level of fullness, the vacuum pump 111 starts to suck up the black water. The end of the discharge pipeline is connected to the anaerobic fermentation reactor 152 of the black water and domestic waste co-processing component 15. The black water buffer tank 112 is made of stainless steel and has a glass observation window that also serves as a debris removal port. 50mm below the removal port, an intercepting screen is installed along the length of the black water buffer tank 112. The black water enters from the upper part of the black water buffer tank 112, passes through the intercepting screen, and reaches the bottom of the black water buffer tank 112. The vacuum pump 111 is installed on the top of the black water buffer tank 112 and sucks water from the bottom of the black water buffer tank 112. The vacuum pump 111 has a built-in debris crushing function to prevent entanglement and clogging.

[0065] The second negative pressure greywater collection component 10 and the second negative pressure blackwater collection component 11 are arranged inside the vacuum pump room 9. Solar panels can be installed on the top of the vacuum pump room 9 to improve the utilization of building space and reduce electricity costs through photovoltaic power generation. The deodorization component 13 is arranged outside the vacuum pump room 9 and mainly collects and treats the odor emitted from the vacuum pump room 9, the pressure relief tank 104, the greywater biochemical treatment component 14, and the blackwater and domestic waste co-treatment component 15. The deodorization component adopts a high-efficiency biological deodorization component.

[0066] like Figure 4 As shown, the second negative pressure greywater collection assembly 10 consists of a vacuum greywater storage tank 101, an air vacuum pump 102, a sewage pump 103, a pressure relief tank 104, a check valve 105, and a control valve 106; the greywater negative pressure conveying pipeline 7 is connected at its end to the upper side of the vacuum greywater storage tank 101. The vacuum greywater storage tank 101 is made of stainless steel and has anti-corrosion treatment. The pressure rating standard is not lower than 1.0 MPa and it should be able to withstand a negative pressure of -0.095 MPa. The liquid storage volume in the vacuum greywater storage tank 101 should not exceed 1 / 3 of the total volume and should not exceed 1 / 2 of the total volume. The liquid level in the vacuum greywater storage tank 101 should not exceed 1 / 2 of the maximum volume of the vacuum tank. The vacuum greywater storage tank 101 is equipped with an observation window and an inspection port. The suction pipe of the air vacuum pump 102 is connected to the top of the vacuum ash water storage tank 101. In the initial stage of operation, the air vacuum pump 102 draws the vacuum ash water storage tank 101 into a vacuum, which is equivalent to pre-storing a vacuum in the vacuum ash water storage tank 101.

[0067] When the liquid level in the outdoor underground greywater storage tank 2 reaches the start-up liquid level, the greywater vacuum collector 3 is activated, and the greywater in the outdoor underground greywater storage tank 2 is sucked into the vacuum greywater storage tank 101 through the greywater negative pressure conveying pipeline 7. After the vacuum ash water storage tank 101 is emptied, the air vacuum pump 102 repeats the operation of the previous cycle. The exhaust pipe of the air vacuum pump 102 is connected to the upper part of the pressure relief tank 104 and is equipped with a vacuum pump water supply pipe and a cavitation protection pipe. The pressure relief tank 104 is equipped with a water inlet, an overflow pipe, and an exhaust port. Water can be replenished manually. The end of the overflow pipe is connected to the ash water biochemical treatment component 14, and the exhaust port is connected to the deodorization component 13 through a odor collection pipe. The suction pipe of the sewage pump 103 is connected to the bottom of the vacuum ash water storage tank 101. When the liquid level in the vacuum ash water storage tank 101 reaches the set height, the sewage pump 103 starts and transports the ash water in the vacuum ash water storage tank 101 to the ash water biochemical treatment component 14 to empty the vacuum ash water storage tank 101. The sewage pump 103 should be able to overcome the maximum vacuum of the vacuum ash water storage tank 101 and can work normally under negative pressure conditions of -0.05MPa to -0.07MPa.

[0068] like Figure 1 As shown, the greywater biological treatment component 14 consists of a buried regulating tank 141, a buried integrated sewage treatment equipment, a buried clear water tank 146, a tailwater pump 147, a dosing assembly 148, a blower 149, and a sludge pump 1410. The regulating tank 141, made of fiberglass, is used to regulate the quality and quantity of the greywater. The inlet of the regulating tank 141 is equipped with a manual screen. The clear water tank 146 is also made of fiberglass. The dosing assembly 148 adds sodium hypochlorite disinfectant to the clear water tank 146 and phosphorus removal agents to the integrated sewage treatment equipment. The suction pipe of the tailwater pump 147 is connected to the clear water tank 146, transporting the treated tailwater to the garden irrigation area for landscaping irrigation. The sludge suction pipe of the sludge pump 1410 is connected to the sedimentation zone of the integrated sewage treatment equipment. The sludge pump 1410 discharges sludge to the black water and domestic waste co-treatment component 15 through the sludge discharge pipe. The blower 149 is used for aeration of the integrated sewage treatment equipment and adopts a Roots blower.

[0069] Integrated wastewater treatment equipment can employ modified AAO-MBR processes, circulating biological filters, MBBR, etc. For example... Figure 1 As shown, an integrated wastewater treatment equipment using a modified AAO-MBR process is provided, comprising:

[0070] The wastewater treatment facility is constructed entirely underground with landscaping above ground to enhance its environmental harmony. The integrated wastewater treatment equipment consists of an anaerobic tank 142, an anoxic tank 143, an aerobic tank 144, and an MBR membrane tank 145. A blower 149 aerates the aerobic tank 144 and the MBR membrane tank 145. A sludge pump 1410 is connected to the sludge settling area at the end of the MBR membrane tank 145. A dosing unit 148 adds phosphorus removal agent PAC to the inlet of the MBR membrane tank 145 and sodium hypochlorite disinfectant to the front end of the clear water tank 146. A tailwater pump 147 transports the treated tailwater to the garden irrigation area for landscaping irrigation.

[0071] like Figure 1 As shown, the co-processing component 15 for black water and domestic waste includes a pretreatment component 151, an anaerobic fermentation reactor 152, a biogas collection and purification component 153, and a biogas residue organic fertilizer preparation component 154. The anaerobic fermentation reactor 152 is underground and has a black water inlet and a kitchen waste organic waste inlet. The pretreatment component 151 is selectively added to the front end of the anaerobic fermentation reactor 152 according to the level of rural waste collection. The pretreatment component 151 mainly includes a pre-processing waste crushing component, an oil-water separation component, and a sand removal component. The pre-processing waste crushing component mainly deals with waste with large volume and high hardness, improves fermentation efficiency, and extends the life of the mixing equipment. Shear crushing can be used. The oil-water separation system mainly prevents the formation of highly viscous suspended matter in the reactor, which affects the normal operation of the equipment. Air flotation separation technology can be used. The sand removal system mainly prevents inorganic sand and gravel from wearing down the equipment and improves the effective utilization volume of the reactor. Gravity sedimentation technology can be used. After strict fermentation and composting, the organic fertilizer produced from rural black water and organic waste is used to support rural industries.

[0072] See Figures 5 to 9As shown, the anaerobic fermentation reactor 152 includes a feed well 1521, a black water inlet pipe 1525, an anaerobic fermentation tank 1526, and a discharge well 1531. The feed well 1521 is used for feeding kitchen waste organic waste. Motor maintenance wells 1522 are provided on both sides of the feed well 1521. A crusher / agitator 1523 is installed inside the feed well 1521, and the drive motor of the crusher / agitator 1523 is located inside the motor maintenance well 1522. The bottom of the feed well 1521 is connected to the anaerobic fermentation tank 1526 through a feed pipe 1524 with a diameter of 300 mm. The inclination angle of the feed pipe 1524 is 4°. 5°; After pretreatment by pretreatment component 151, the black water enters the anaerobic fermentation tank 1526 through the black water inlet pipe 1525. The black water inlet pipe 1525 has a diameter ≥100mm and uses a perforated water distribution method to form a water distribution hole 1535. The water distribution hole 1535 has a diameter of 15mm and is opened at a 45° downward angle. The distance from the center of the axis of the black water inlet pipe 1525 to the bottom surface of the anaerobic fermentation tank 1526 is 200mm. The anaerobic fermentation tank 1526 is equipped with an inclined double-blade agitator 1527 with an inclination angle of 20°~30° to the horizontal. 527 is fixed by two embedded iron pieces pre-embedded in the inner and outer walls of the anaerobic fermentation tank 1526; the lower part of the anaerobic fermentation tank 1526 is a square reaction zone, and the upper part is a square solid-liquid-gas separation zone. The square reaction zone contains kitchen waste and organic waste. The biogas produced is discharged to the biogas collection and purification component 153 through the conical gas guide tube 1528 suspended in the square solid-liquid-gas separation zone. The supernatant flows from the effluent triangular weir to the effluent channel. The bottom of the effluent channel is equipped with a discharge pipe 1532, and the supernatant flows back to the regulating water tank 141. To prevent organic matter from entering the effluent channel, a slag-blocking skirt 1529 is installed below the inner wall of the effluent channel, which is connected to the vertical... The installation angle is 40° to 60°. The upper end of the baffle skirt 1529 is fixedly connected by an L-shaped screw 1534 pre-embedded in the pool wall, and the lower end rests on a horizontal support rod 1533 fixed to the inner wall of the anaerobic fermentation tank 1526. Both the L-shaped screw 1534 and the horizontal support rod 1533 are fixed with pre-embedded irons pre-embedded in the inner wall of the anaerobic fermentation tank. A discharge pipe 1530 is set on the opposite side of the feed pipe 1524 of the anaerobic fermentation tank 1526. The discharge pipe 1530 has a diameter of 300mm and an inclination angle of 10°. The end of the discharge pipe 1530 is connected to the discharge well 1531.

[0073] See Figure 10 As shown, the present invention also provides a wastewater collection and treatment method with zero-discharge resource recovery, comprising the following steps:

[0074] S1: Vacuum pump room 9 draws air from gray water negative pressure conveying pipeline 7 and black water negative pressure conveying pipeline 8 to form negative pressure in the pipelines;

[0075] S2: The ash water flows into the first negative pressure ash water collection component under the action of gravity. When the first negative pressure ash water collection component continuously collects ash water and reaches the first predetermined threshold, it transports the ash water to the second negative pressure ash water collection component 10.

[0076] The black water enters the second negative pressure black water collection component 11 under the continuous suction of the first negative pressure black water collection component;

[0077] S3: When the second negative pressure greywater collection component 10 continuously collects greywater, the deodorization component 13 continuously collects the gas emitted by the second negative pressure greywater collection component 10. When the second negative pressure greywater collection component 10 continuously collects greywater to the second predetermined threshold, it stops collecting greywater and transports the greywater to the greywater biochemical treatment component 14. When the greywater in the second negative pressure greywater collection component 10 is emptied, the collection operation is repeated.

[0078] When the second negative pressure black water collection component 11 continuously collects black water and reaches the third predetermined threshold, it will transport the black water to the black water and domestic waste co-processing component 15.

[0079] S4: The grey water biological treatment component 14 performs biological reaction, filtration and disinfection treatment on the grey water in sequence, and discharges the remaining sludge of the grey water biological treatment component 14 to the black water and domestic waste co-treatment component 15;

[0080] The black water and municipal solid waste co-treatment component 15 performs anaerobic fermentation on the remaining sludge from the black water and / or grey water biochemical treatment component 14, and discharges the supernatant formed by anaerobic fermentation to the grey water biochemical treatment component 14 for biochemical treatment.

[0081] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.

Claims

1. A zero-emission, resource-efficient wastewater collection and treatment device, characterized in that, include: Negative pressure collection components, negative pressure conveying pipelines, vacuum pump rooms, grey water biochemical treatment components, and black water and municipal solid waste co-treatment components; The negative pressure collection component includes a first negative pressure black water collection component and a first negative pressure grey water collection component; the negative pressure conveying pipeline includes a grey water negative pressure conveying pipeline and a black water negative pressure conveying pipeline; and the vacuum pump room includes a second negative pressure black water collection component, a second negative pressure grey water collection component, and a deodorization component. Grey water sequentially passes through the first negative pressure grey water collection component, the grey water negative pressure conveying pipeline, and the second negative pressure grey water collection component before entering the grey water biochemical treatment component. Black water sequentially passes through the first negative pressure black water collection component, the black water negative pressure conveying pipeline, and the second negative pressure black water collection component before entering the black water and municipal solid waste co-processing component. The first negative pressure grey water collection component includes an outdoor buried grey water storage tank. The outdoor buried grey water storage tank is equipped with a screenings basket that is connected to the side wall of the tank by a lifting ring. The screenings basket is used to intercept impurities in the grey water. The co-treatment component for black water and municipal solid waste includes a pretreatment component, an anaerobic fermentation reactor, a biogas collection and purification component, and a biogas residue organic fertilizer preparation component. The biogas produced by the anaerobic fermentation reactor enters the biogas collection and purification component, and the end of the anaerobic fermentation reactor is connected to the biogas residue organic fertilizer preparation component. The pretreatment component includes a pre-processing waste crushing device, an oil-water separation device, and a sand removal device. The greywater biological treatment component includes a regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, an MBR membrane tank, a clear water tank, and a tailwater pump connected in sequence. It also includes a dosing component, a blower, and a sludge pump. The dosing component adds disinfectant to the clear water tank and phosphorus removal agent to the MBR membrane tank. The blower is used to aerate the aerobic tank and the MBR membrane tank. The sludge pump is connected to the settling zone at the end of the MBR membrane tank through a sludge suction pipe, and discharges the sludge in the MBR membrane tank into the anaerobic fermentation reactor. The anaerobic fermentation reactor is connected to the equalization tank and is used to discharge the supernatant into the equalization tank. The anaerobic fermentation reactor includes a feed well, a black water inlet pipe, an anaerobic fermentation tank, and a discharge well. The bottom of the feed well is connected to one side of the anaerobic fermentation tank through a feed pipe. The angle between the feed pipe and the horizontal direction is 30-50°. The diameter of the black water inlet pipe is ≥100mm. The black water inlet pipe is connected to the bottom of the anaerobic fermentation tank and extends along the inner bottom surface of the anaerobic fermentation tank. The distance between the central axis of the black water inlet pipe and the inner bottom surface of the anaerobic fermentation tank is 200-300mm. The part of the black water inlet pipe located inside the anaerobic fermentation tank has several pairs of water distribution holes distributed along its axial direction. The same pair of water distribution holes are located on the same radial section. Each water distribution hole faces the inner bottom surface of the anaerobic fermentation tank at 40-50°. The diameter of the water distribution hole is 15-25mm. The other side of the anaerobic fermentation tank is connected to the discharge well through a discharge pipe, and the angle between the discharge pipe and the horizontal direction is 10-20°. The upper part of the anaerobic fermentation tank is a square solid-liquid-gas separation zone, and the lower part is a square reaction zone. The upper part is inverted cone-shaped, with a conical air guide tube suspended on the upper part. The conical air guide tube is fixed to the upper part of the anaerobic fermentation tank by radially inserted expansion bolts. The upper part of the anaerobic fermentation tank and the outer corner of the conical air guide tube are fixed by welding. The conical air guide tube is connected to the biogas collection and purification components. The square reaction zone is equipped with a tilted double-blade agitator with an angle of 20-30° to the horizontal direction. The double-blade agitator is fixed by embedded iron pre-embedded in the inner and outer walls of the anaerobic fermentation tank. The square solid-liquid-gas separation zone is equipped with an effluent triangular weir and an effluent channel surrounding the effluent triangular weir. The supernatant flows into the effluent channel through the effluent triangular weir and then flows to the regulating water tank through the discharge pipe at the bottom of the effluent channel. A slag-blocking skirt is installed below the inner wall of the effluent triangular weir. The angle between the slag-blocking skirt and the vertical direction is 40-60°. The upper end of the slag-blocking skirt is fixedly connected by an L-shaped screw embedded in the inner wall of the anaerobic fermentation tank. The lower end of the slag-blocking skirt rests on the inner end of the horizontal support rod. The outer end of the horizontal support rod is fixed to the inner wall of the anaerobic fermentation tank. Both the L-shaped screw and the outer end of the horizontal support rod are fixed with embedded iron embedded in the inner wall of the anaerobic fermentation tank. The greywater biochemical treatment unit is connected to the blackwater and municipal solid waste co-treatment unit. The sludge from the greywater biochemical treatment unit is discharged to the blackwater and municipal solid waste co-treatment unit, and the supernatant from the blackwater and municipal solid waste co-treatment unit is discharged to the greywater biochemical treatment unit.

2. The wastewater collection and treatment device as described in claim 1, characterized in that, The first negative pressure ash water collection assembly also includes an ash water vacuum collector, which includes a control cabinet and a vacuum valve; The upper end of the outdoor underground ash water storage tank is equipped with an inspection port, and the inspection port is equipped with a manhole cover that is flush with the outdoor underground ash water storage tank. Hooks are distributed on both sides of the inspection port. The screenings basket is suspended at the front end of the outdoor buried ash water storage tank. The screenings basket has a gap of ≤5mm. The outdoor buried ash water storage tank is also equipped with a float rod. The rod of the float rod passes through the outdoor buried ash water storage tank and protrudes. The float part of the float rod floats on the ash water liquid surface in the outdoor buried ash water storage tank. The upper and lower parts of the rod are coated with different colors. The outdoor buried grey water storage tank is equipped with a water collection pit at its end. The inlet end of the grey water negative pressure conveying pipeline extends into the water collection pit and is equipped with a water suction bell mouth with a filter screen and a support. The outlet end of the grey water negative pressure conveying pipeline is connected to a grey water vacuum collector. If the lower part of the rod protrudes through the outdoor buried grey water storage tank, the control cabinet controls the vacuum valve to draw the grey water from the outdoor buried grey water storage tank into the second negative pressure grey water collection component through the water suction bell mouth.

3. The wastewater collection and treatment device as described in claim 1, characterized in that, The negative pressure conveying pipeline is equipped with an outdoor valve well, a lifting and maintenance well and an end maintenance well in sequence, and the distance between two adjacent lifting and maintenance wells is ≤400m.

4. The wastewater collection and treatment device as described in claim 1, characterized in that, The second negative pressure grey water collection assembly also includes a vacuum grey water storage tank, a pressure relief tank, an air vacuum pump, a sewage pump, a control valve, and a check valve; The end of the negative pressure conveying pipeline is connected to the upper side of the vacuum ash water storage tank. The top of the vacuum ash water storage tank is connected to one end of the suction pipe, the other end of the suction pipe is connected to the air inlet of the air vacuum pump, the air outlet of the air vacuum pump is connected to one end of the exhaust pipe, the other end of the exhaust pipe is connected to the top of the pressure relief tank, the top of the pressure relief tank is also connected to one end of the odor collection pipe, and the other end of the odor collection pipe is connected to the deodorization component. The bottom of the pressure relief tank is connected to one end of the vacuum pump water supply pipe, the other end of the vacuum pump water supply pipe is connected to the air vacuum pump, the side wall of the pressure relief tank is connected to one end of the overflow pipe, the other end of the overflow pipe is connected to the grey water biochemical treatment component, and the lower part of the pressure relief tank is provided with a water inlet for water replenishment. The bottom of the vacuum grey water storage tank is connected to a sewage pump via a suction pipe. The sewage pump transports the grey water in the vacuum grey water storage tank to the grey water biochemical treatment unit. The vacuum ash water storage tank has a pressure tolerance range of -0.1MPa to 1.0MPa, and the ash water capacity of the vacuum ash water storage tank does not exceed 1 / 2 of the total volume.

5. The wastewater collection and treatment device as described in claim 1, characterized in that, Motor maintenance wells are provided on both sides of the feed well. A crushing and agitating device is installed inside the feed well. The drive motor of the crushing and agitating device is located inside the motor maintenance well. The diameter of the feed pipe is ≥300mm. The diameter of the discharge pipe is ≥300mm.

6. The sewage collection and treatment device as described in claim 1, characterized in that, The second negative pressure black water collection component includes a vacuum pump, a black water buffer tank, and a discharge pipeline. The end of the black water negative pressure delivery pipeline is connected to the upper part of the black water buffer tank. The vacuum pump is installed on the top of the black water buffer tank and is connected to the discharge pipeline. If the black water in the black water buffer tank reaches the threshold height, the vacuum pump discharges the black water through the discharge pipeline into the black water and domestic waste co-processing component.

7. The wastewater collection and treatment device as described in claim 6, characterized in that, The black water buffer tank is also equipped with a cleaning port on the side wall, and an intercepting screen is installed 50-100mm below the cleaning port, extending horizontally along the black water buffer tank.

8. A zero-discharge, resource-efficient wastewater collection and treatment method, characterized in that, The wastewater collection and treatment device as described in any one of claims 1-7 includes the following steps: S1: The vacuum pump room evacuates air from the gray water negative pressure conveying pipeline and the black water negative pressure conveying pipeline to form negative pressure in the pipeline; S2: Under the action of gravity, the ash water flows into the first negative pressure ash water collection component. When the first negative pressure ash water collection component continuously collects ash water and reaches the first predetermined threshold, it transports the ash water to the second negative pressure ash water collection component. The black water enters the second negative pressure black water collection component under the continuous suction of the first negative pressure black water collection component; S3: When the second negative pressure ash water collection component continues to collect ash water, the deodorization component continues to collect the gas emitted by the second negative pressure ash water collection component. When the second negative pressure ash water collection component continuously collects ash water to the second predetermined threshold, it stops collecting ash water and transports the ash water to the ash water biochemical treatment component. When the ash water in the second negative pressure ash water collection component is emptied, the collection operation is repeated. When the second negative pressure black water collection component continuously collects black water and reaches the third predetermined threshold, it will transport the black water to the black water and municipal solid waste co-processing component. S4: The grey water biological treatment unit performs biological reaction, filtration and disinfection treatment on grey water in sequence, and discharges the remaining sludge of the grey water biological treatment unit to the black water and domestic waste co-treatment unit; The co-treatment unit for black water and municipal solid waste performs anaerobic fermentation on the residual sludge from the black water and / or grey water biochemical treatment unit, and discharges the supernatant formed by anaerobic fermentation to the grey water biochemical treatment unit for biochemical treatment.

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