A rural outdoor vacuum drainage system

Abstract

This invention discloses an outdoor vacuum drainage system for domestic sewage. The 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. Firstly, it combines the flow conversion function of the vacuum collection box with the interception function of traditional household septic tanks, preventing large pieces of sewage from entering the pipe network and effectively alleviating pipe blockage problems. Secondly, it changes the vacuum pump station from the traditional above-ground + underground type to an underground prefabricated pump station, which not only meets the relevant regulations for agricultural land use but also shortens and simplifies the construction cycle and steps. Thirdly, it replaces the deodorizing biological filter at the vacuum pump exhaust pipe outlet with an ozone deodorization device located within the vacuum pump station, avoiding secondary pollution while improving upon the drawbacks of biological filters, such as high susceptibility to environmental impact, high maintenance workload, inability to operate intermittently, and the need for professional management personnel, while also saving land area.

Description

Technical Field

[0001] The present invention is applicable to the field of rural outdoor vacuum drainage, and is applicable to situations such as short construction period, scattered drainage points, long drainage distance, flat terrain, narrow streets, need to cross obstacles such as water systems and pipelines, deep pipeline burial depth, high groundwater level, low population density, water source protection area, etc. It can be used to replace traditional outdoor gravity drainage systems and existing outdoor vacuum drainage systems, and particularly relates to a rural outdoor vacuum drainage system. Background Art

[0002] In recent years, with the country's vigorous promotion of new rural construction and beautiful countryside construction, rural sewage collection and treatment involving rural water environment governance have received key support from the state and local governments and have developed rapidly. Rural sewage pipe networking has become a trend; a small number of villages close to urban areas and towns that meet the conditions for access to urban sewage collection pipe networks are included in the urban and town sewage pipe network systems and are centrally treated by urban sewage treatment plants; most villages currently adopt a decentralized collection and treatment model.

[0003] Rural domestic sewage includes drainage from washing, bathing, cooking, excrement and flushing, and is characterized by wide dispersion, multiple sources, rapid growth, complex sewage composition, and large changes in water quality and quantity. A typical rural sewage collection and treatment system usually consists of a sewage pipe network system (user outlet pipes, household three-compartment or two-compartment septic tanks, sewage pipe network, intermediate lifting pump stations) and terminal treatment facilities.

[0004] At present, the rural sewage pipe network system generally adopts the gravity drainage system. It is necessary to divide the drainage basin and lay the sewage pipe network according to the vertical elevation of the village, the distribution of natural water systems and households, and the situation of the drainage outlet. The investment in the sewage pipe network system accounts for about 70% to 80% of the total investment in the rural sewage collection and treatment system.

[0005] The current rural sewage gravity drainage system generally has the following problems:

[0006] 1. The system setting is greatly affected by the water system and obstacles. It is usually divided into several drainage basins according to the natural water system, and water collection pipes and treatment facilities are set up separately. When the number of sewage treatment stations increases, the initial investment cost will be significantly increased, and it will bring troubles to the operation and management of the sewage treatment stations.

[0007] 2. Village drainage usually has a large basin, a long main pipe, but a small flow rate. The minimum slope of the commonly used drainage pipe diameter de200 / 300 is 0.004 / 0.002. In flat areas, the average buried depth of the gravity system pipe is about 2 to 2.5m, while the buried depth in front of the terminal treatment station can reach 3 to 5m; the trench is deep, and precipitation construction is required when encountering groundwater, and support piles are driven for enclosure, which has a high construction cost; rural sewage pipe network construction will cause casualties every year due to deep trenches, improper support measures, and landslides.

[0008] 3. Inspection wells need to be installed between the pipes of the gravity drainage system. On the one hand, it will increase the width of the trench. On the other hand, various foreign objects often enter the manhole covers with vents in rural road environments and are deposited in the wells, increasing blockage. At the same time, the discharged odor and the breeding of mosquitoes and flies also pollute the surrounding environment through the vents.

[0009] 4. When a gravity drainage pipe with a large burial depth passes through a rural street with a net width of 2 to 4 meters, the excavation of deep trenches poses a great threat to the shallow foundations of farmhouses, and can easily cause the collapse of farmhouses and walls on the ground.

[0010] 5. Due to the high investment cost of the sewage pipe network system, construction units often reduce costs and strive for profits by sacrificing the drainage slope; when the drainage slope is less than the minimum slope of the pipeline, the pipe network is prone to clogging, which brings difficulties to maintenance and management.

[0011] 6. In the gravity drainage system, socket joints are used between pipes and between pipes and inspection wells, resulting in a high leakage rate, posing a threat to the safety of groundwater quality.

[0012] The vacuum drainage system is a drainage system that uses vacuum equipment to create a certain degree of vacuum in the drainage pipe and uses air pressure difference to transport the medium. The system is suitable for occasions such as scattered drainage points, long drainage distances, flat terrain, the need to cross obstacles, high groundwater levels, low population density, and water source protection areas.

[0013] The vacuum drainage system was created in the 1860s to the 1960s. The vacuum drainage system was proposed by Dutch engineer Charles T. Liemur in 1867. The negative pressure of the system was generated by a steam engine driving a vacuum pump, and cast iron vacuum pipes were used. In 1873, Amsterdam built the world's first vacuum drainage system, which was later used in European cities such as Paris and Berlin. By 1905, Amsterdam had thousands of toilets using vacuum drainage. In 1956, Swedish engineer Joel Liljendhal invented the vacuum connection valve device in the vacuum system.

[0014] From the 1960s to the 1990s, vacuum drainage technology entered a stage of development and maturity. The U.S. Environmental Protection Agency broke through the two most critical problems in outdoor vacuum drainage sewage collection systems - vacuum interface valves and vacuum pipeline transportation; in 1978, Passavant-Roediger built the first ROEVAC vacuum drainage system, and in 1980, the system was first used to treat wastewater from hospital radiology departments. By the 1990s, vacuum drainage technology had reached maturity for large-scale application in Europe and the United States, but it still needed to be further improved.

[0015] Since the 1990s, vacuum drainage technology has been improving and optimizing. Countries such as Japan and the United States have improved the reliability of the system, improved system energy saving, and equipment integration by improving key components in the vacuum drainage system and adopting modern monitoring methods. So far, the vacuum drainage system has the basic characteristics of reliability, controllability, standardization, informatization, economic feasibility, and environmental friendliness, meeting the basic requirements of becoming a modern drainage system.

[0016] By introducing, digesting and absorbing foreign vacuum drainage technology, vacuum drainage has been first applied in my country in the fields of railways (such as railway passenger car vacuum feces collection devices, Beijing-Shanghai high-speed railway ground sewage unloading system), construction (such as Yantai Cultural Center indoor vacuum drainage system, Guangzhou Baiyun International Convention Center vacuum drainage system), municipal (such as riverside vacuum sewage interception project, Jinan Shaonian Road rainwater emergency vacuum drainage system), ships (such as New Century cruise ship vacuum feces collection system, "Xuelong" polar research ship vacuum feces collection system), aviation (such as MD-11 aircraft airborne vacuum sewage system DLV-1 airborne vacuum sewage system) and so on.

[0017] In 2012, the China Engineering Construction Standards Association issued the recommended standard CECS316:2012 "Technical Specifications for Outdoor Vacuum Drainage System Engineering", which provides a basis for the standardized design and installation of outdoor vacuum drainage systems. The existing outdoor vacuum drainage system in my country refers to the relevant requirements of European standards; the length of the vacuum main pipe of a single vacuum pump station is ≤4Km; the cumulative climbing height of the vacuum drainage main pipe is ≤5m (the maximum cumulative height should be corrected according to the local altitude); a finished product collection box is set between the indoor gravity pipe and the outdoor vacuum pipe to convert the gravity and vacuum flow states; the vacuum pipe is laid in a zigzag or bag shape, the minimum slope of the vacuum pipe between the lifting bends or U-bends is 0.002, and the spacing between the lifting bends is between 6 and 100m; each lifting bend or U-bend An inspection pipe leading to the ground is installed at the pipe; no gravity slope is required for drainage, and upward transportation along the slope is allowed; each vacuum drainage system is equipped with a vacuum tank, which can be buried outside the vacuum pump station or inside the vacuum pump station; the vacuum pump station building consists of above-ground and underground parts, the underground part is equipped with a vacuum tank, drainage pump (1 for use and 1 for backup) and vacuum pump (1 for use and 1 for backup), and the above-ground part is equipped with a distribution cabinet and a control cabinet; the drainage pump outlet water is connected to the sewage treatment facility or the municipal sewage network; the vacuum pump exhaust pipe is discharged after deodorization treatment in the outdoor deodorization biological filter; the vacuum pump station adopts dual power supply or dual circuit power supply.

[0018] The outdoor vacuum drainage system has the advantages of small pipe diameter (de80-200), shallow burial depth (0.7~1.1m), narrow trench, no need to set up inspection wells, no precipitation construction, no need to drive supporting piles in the trench, the drainage system is not affected by rivers and obstacles, the number of sewage treatment stations is small, the construction is convenient and fast, and the construction period is short. Compared with the gravity drainage system, the investment cost of the sewage pipe network system has been greatly reduced; at the same time, the vacuum drainage system is fully enclosed and has no leakage, no odor overflow, and the sanitary conditions are superior to the gravity system; in addition, the vacuum drainage system has a high flow rate, the pipe network is not easy to be clogged, and the later pipe network maintenance cost is lower than the gravity system; due to the shallow pipeline trench, casualties and the collapse of farmhouse buildings are also avoided; in summary, the outdoor vacuum drainage system has obvious comprehensive advantages in replacing the outdoor gravity drainage system.

[0019] The existing outdoor vacuum drainage system still has the following problems to be solved when used in rural areas:

[0020] 1. When the gravity drainage system is adopted in rural areas, a septic tank is installed on the outlet pipe of each household. The septic tank can intercept large pieces of dirt and feces (farmers can clean it by themselves), which is a very simple and effective measure to prevent the blockage of sewage pipe network. However, the sewage collection chamber of the sewage collection box installed between the farmer's outlet pipe and the sewage trunk pipe in the current outdoor vacuum drainage system has a too small volume, which cannot effectively intercept large pieces of dirt and feces, and is not convenient for farmers to clean up the sewage.

[0021] 2. According to the regulations of the Ministry of Natural Resources, vacuum pumping stations and sewage treatment stations must not occupy arable land or agricultural land when selecting sites, and should use capital construction land as much as possible. Currently, the capital construction land available in rural areas is scarce, and agricultural land needs to be occupied in most cases. Any buildings above the ground on agricultural land are illegal buildings. Therefore, vacuum pumping stations cannot have ground buildings and can only be made into fully underground structures.

[0022] 3. The "Technical Code for Outdoor Vacuum Drainage System Engineering" (CECS316:2012) recommends the use of a deodorizing biological filter to treat the exhaust gas of a vacuum pump. This not only occupies a large area, but also the pollutants trapped in the exhaust gas adhere to the open filter layer, causing secondary pollution to the environment itself and easily breeding mosquitoes and flies. In addition, the biological filter is also greatly affected by the environment (especially in the northern winter), has a large workload for subsequent maintenance, cannot be operated intermittently, and requires professional personnel for management and operation.

[0023] To sum up, although the outdoor vacuum drainage system is superior to the gravity drainage system, it still needs major improvements on the three core parts mentioned above in order to adapt to the construction of rural sewage pipe network system. Summary of the invention

[0024] In view of the technical problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a rural outdoor vacuum drainage system.

[0025] To achieve the purpose of the present invention, the present invention provides a rural outdoor vacuum drainage system, including: a septic tank, a vacuum drainage pipeline and a control valve, an underground vacuum tank, and an underground prefabricated vacuum pump station.

[0026] The indoor gravity drainage system of farmers' households discharges the sewage to the outdoor septic tanks of each household through gravity outlet pipes for solid-liquid separation; the indoor gravity drainage pipes of farmers' households are provided with top ventilation pipes; the septic tanks are connected to underground vacuum tanks through vacuum drainage pipes and control valves, and the underground vacuum tanks are connected to underground prefabricated vacuum pump stations.

[0027] Wherein, a third inspection well is arranged between the septic collection box and the gravity outlet pipe.

[0028] The septic tank is used as a converter between gravity drainage and vacuum drainage, and is also used as a container for intercepting feces and large sediments of a certain volume. Depending on whether the compartment where the vacuum valve is located is combined with the feces interception space, it is divided into two independent schemes:

[0029] The first type: the septic tank comprises an upper valve chamber and a lower feces interception space, and the upper valve chamber and the lower feces interception space adopt an integrated structure; wherein the lower feces interception space is divided into three compartments, namely, the first compartment, the second compartment and the third compartment, and the volumes occupied by the three compartments are 50%, 25% and 25% respectively; the first two compartments, namely, the first compartment and the second compartment, have the function of intercepting large pieces of dirt and feces; the third compartment collects relatively clean sewage as a suction trough for vacuum pipes to suck sewage; above the suction trough is a valve chamber with an independent space, in which a vacuum valve, a controller, an upper port of a sensing tube, a pressure transmitter and connecting pipelines including a pneumatic tube are arranged; the vacuum suction pipe and the sensing tube pass through the bottom of the valve chamber and extend into the third compartment at a distance of 0.05 to 0.1 m from the bottom of the suction trough;

[0030] The three compartments in the lower space of the septic tank are connected by holes, where the top of the first partition is not less than 0.1m from the top plate, and the top of the second partition is not less than 0.05m lower than the bottom elevation of the gravity drainage pipe; the first partition is more than 0.5m away from the bottom of the tank and has at least 2 water holes; the top of the first compartment is provided with a first inspection well connected to the ground, and the top between the second and third compartments is provided with a second inspection well connected to the ground; the manhole covers and well seats of the valve chamber and the inspection wells are heavy-duty protective manhole covers and well seats; the manhole cover of the valve chamber should be airtight and without ventilation holes; the soil thickness of the septic tank is not less than 0.3m; the septic tank is made of corrosion-resistant and easy-to-construct fiberglass or PE material;

[0031] When the sewage is discharged into the first two compartments of the septic tank, the solid matter with a larger specific gravity and parasite eggs settle to the bottom of the tank. After fermentation and decomposition, the sewage is divided into a paste-like floating skin and a clear sewage liquid solid waste residue. The sewage liquid treated in the second compartment is further rendered harmless; the waste liquid flowing into the third compartment is generally decomposed; the sewage flowing into the third compartment is temporarily stored in the suction tank, and the water pressure change is transmitted to the controller through the induction tube. When the sewage volume reaches the preset volume, the controller controls the vacuum valve to switch from the closed state to the open state, and the sewage in the suction tank is connected to the vacuum pipe, and the sewage is sucked into the vacuum pipeline. After a certain amount of sewage and air are sucked in, the liquid level of the suction tank drops and the vacuum valve is automatically reset; the controller can adjust the opening time of the vacuum valve and the flow rate of the gas-liquid mixture; the sewage treated by the septic tank completes the solid-liquid separation process, and the solid waste residue is retained in the first two compartments of the septic tank. The sewage and waste gas are discharged into the vacuum pipe and finally discharged into the vacuum tank.

[0032] The second type: the septic tank comprises an upper valve box and a lower feces interception space, the valve box and the feces interception space are separately arranged, and the vacuum valve is arranged in an independent valve box;

[0033] The vacuum sewage suction pipe and the induction pipe pass through the bottom of the valve box and extend into the sewage suction tank from the side wall of the third compartment of the feces interception space 0.1m from the bottom; the pressure probe of the pressure transmitter extends from the top pressure probe interface of the third compartment into the bottom of the sewage suction tank for fixed installation; the pressure transmitter is installed in the valve box; the box cover should be airtight without vents; when the top cover is installed on the hardened ground, a heavy-duty protective manhole cover and manhole seat are added on top of the plastic top cover of the valve box;

[0034] The lower feces interception space is divided into three compartments, the first compartment, the second compartment and the third compartment, and the volumes of the three compartments are 50%, 25% and 25% respectively; the first two compartments, the first compartment and the second compartment, have the function of intercepting large pieces of dirt and feces; the third compartment collects relatively clean sewage as a sewage suction tank for vacuum pipes to suck sewage;

[0035] The three compartments in the lower space of the septic tank are connected by holes, where the top of the first partition is not less than 0.1m from the top plate, and the top of the second partition is not less than 0.05m lower than the bottom elevation of the gravity drainage pipe; the first partition is more than 0.5m away from the bottom of the tank and has at least 2 water holes; the top of the first compartment is provided with a first inspection well connected to the ground, and the top between the second and third compartments is provided with a second inspection well connected to the ground; the manhole cover and well seat of the inspection well are heavy-duty protective manhole covers and well seats; the soil thickness of the septic tank is not less than 0.3m; the septic tank is made of corrosion-resistant and easy-to-construct fiberglass or PE material;

[0036] When the sewage is discharged into the first two compartments of the septic tank, the solid matter with a larger specific gravity and parasite eggs settle to the bottom of the tank. After fermentation and decomposition, the sewage is divided into a paste-like floating skin and a clear sewage liquid solid waste residue. The sewage liquid treated in the second compartment is further rendered harmless; the waste liquid flowing into the third compartment is generally decomposed; the sewage flowing into the third compartment is temporarily stored in the suction tank, and the water pressure change is transmitted to the controller through the induction tube. When the sewage volume reaches the preset volume, the controller controls the vacuum valve to switch from the closed state to the open state, and the sewage in the suction tank is connected to the vacuum pipe, and the sewage is sucked into the vacuum pipeline. After a certain amount of sewage and air are sucked in, the liquid level of the suction tank drops and the vacuum valve is automatically reset; the controller can adjust the opening time of the vacuum valve and the flow rate of the gas-liquid mixture; the sewage treated by the septic tank completes the solid-liquid separation process, and the solid waste residue is retained in the first two compartments of the septic tank. The sewage and waste gas are discharged into the vacuum pipe and finally discharged into the vacuum tank.

[0037] Among them, the pipelines of the vacuum drainage system include a vacuum discharge pipe, a vacuum drainage branch pipe, a vacuum drainage main pipe and a first inspection pipe; wherein, the vacuum pipeline is laid in a zigzag or bag shape, the minimum slope of the vacuum pipeline between the lifting bends or U-shaped bends is 0.002, and the spacing between the lifting bends in the zigzag laying method is between 6 and 100m; drainage does not require a gravity slope, and upward transportation along the slope is allowed. When the pipeline climbs continuously, a U-shaped bend is set before the 45° rising section; an inspection pipe leading to the ground is set at each lifting bend or U-shaped pipe; the flow rate of the vacuum pipeline is controlled at 3 to 7m / s.

[0038] The vacuum pipeline adopts high-density polyethylene pipes and homogeneous pipe fittings, connected by electric fusion; or adopts rigid polyvinyl chloride pipes and homogeneous pipe fittings, bonded; when the branch pipe of the vacuum pipeline is connected to the main pipe and the length of the straight pipe is greater than 400m, a maintenance valve should be installed.

[0039] Among them, the pressure inside the buried vacuum tank is maintained between -0.06 and -0.07MPa, and the tank body pressure should not be less than -0.095MPa; the maximum liquid level in the buried vacuum tank should not exceed 1 / 2 of the effective height of the tank body.

[0040] Among them, the underground prefabricated vacuum pump station is arranged near the sewage treatment station or in the center of the vacuum drainage system; it adopts an underground integrated structure, with a vacuum pump, a drainage pump, a submersible sewage pump, and an ozone deodorization device installed inside. A power distribution cabinet and a control cabinet are installed on the ground outside the pump station. The vacuum pump sucks the gas in the underground vacuum tank into the deodorization device for treatment and then discharges it. The drainage pump discharges the sewage and wastewater to the sewage treatment station or the municipal sewage pipeline, and the gas-liquid separation process is completed in the vacuum pump station.

[0041] Among them, the vacuum pumps are two or more rotary vane vacuum pumps with the same operating capacity, low noise and high efficiency, one of which is a spare pump; the vacuum pump air inlet pipe is connected to the top of the buried vacuum tank, and the vacuum pump air outlet pipe is connected to the ozone deodorization device.

[0042] Among them, the drainage pumps are two or more centrifugal drainage pumps of the same model, low-noise dry installation, with cutting function, and a spare pump is set; the drainage pump is connected to the bottom of the buried vacuum tank, and its drainage capacity should meet the drainage requirements of the vacuum tank.

[0043] Among them, a sump is set in the underground prefabricated vacuum pump station, and the sump is used to collect a small amount of pipe leakage. A submersible sewage pump is installed in the sump, and a sewage-specific check valve and gate valve are provided on the outlet pipe of the submersible sewage pump; the drainage pipe of the submersible sewage pump is discharged to the outside after merging with the discharge pipe of the drainage pump.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention relates to an outdoor vacuum drainage system for domestic sewage that meets the conditions for use in rural areas, and solves the problems of the outdoor gravity drainage system currently commonly used in rural areas, such as large buried depth and large pipe diameter, high cost, easy clogging, easy leakage, cumbersome construction, long construction period, difficult maintenance, poor environmental sanitation, many sewage stations, and difficult management; while retaining the existing vacuum pipeline laying method and maintaining the advantages and foundation of the existing outdoor vacuum drainage system with small pipe diameter, shallow buried depth, no leakage, no impact on the surrounding environment, convenient and fast construction, short construction period, and long transportation distance, the flow state conversion function of the collection box in the existing system is firstly combined with the interception function of the traditional household septic tank The combination of septic tank and sewage treatment function realizes the three-phase separation of gas, liquid and solid in sewage, avoids large pollutants from entering the pipe network, and can effectively avoid the problem of vacuum pipe blockage; at the same time, the form of the vacuum pump station is changed from the traditional above-ground + underground type to a prefabricated underground pump station, which not only meets the relevant regulations on the use of agricultural land, but also shortens and simplifies the construction period and steps; in addition, the deodorizing biological filter tank installed at the outlet of the vacuum pump exhaust pipe is changed to an ozone deodorizing device installed in the vacuum pump station. While avoiding secondary pollution, it improves the disadvantages of the biological filter tank being greatly affected by the environment, the large workload of later maintenance, the inability to operate intermittently, and the need for professionals for management and operation. The operation is simpler, the treatment effect is more stable, and the floor space is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 Shown is a schematic diagram of the structure of the rural outdoor vacuum drainage system of this application;

[0046] Figure 2 The figure shows a schematic structural diagram of a first embodiment of a septic tank collection box of the present application;

[0047] Figure 3 Shown is a structural schematic diagram of a second embodiment of a septic tank collection box of the present application;

[0048] Figure 4 The figure shows the structure diagram of the underground prefabricated vacuum pump station of the present application;

[0049] In the figure, 1-ventilation pipe, 2-gravity outlet pipe, 3-third inspection well, 4-septic collection box, 5-vacuum discharge pipe, 6-vacuum drainage main pipe, 7-vacuum drainage branch pipe, 8-lifting bend, 9-first inspection pipe, 10-inspection hole, 11-second inspection pipe, 12-underground vacuum tank, 13-exhaust pipe, 14-underground prefabricated vacuum pump station, 15-pressure drainage pipe, 16-floor, 17-control cabinet, 18-distribution cabinet, 19-foundation, 20-vacuum tank pressure transmitter interface, 41-first inspection well, 42-first inspection well cover, 43-second inspection well, 44-second inspection well Manhole cover, 45-feces interception space, 46-valve chamber, 47-valve chamber cover, 48-controller, 49-vacuum valve, 410-monitoring line interface, 411-vacuum discharge pipe, 412-pressure transmitter interface, 413-sensing tube, 141-submersible sewage pump, 142-sump, 143-check valve, 144-gate valve, 145-rotor flowmeter, 146-ozone generator, 147-stop valve, 148-manhole, 149-exhaust pipe, 1410-unpowered wind hood, 1411-pressure sensor, 1412-channel steel base, 1413-exhaust pipe, 1414-vacuum gauge. DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0052] like Figure 1-Figure 4As shown, the present invention relates to an outdoor vacuum drainage system for domestic sewage that meets the conditions for use in rural areas, and solves the problems of the outdoor gravity drainage system currently commonly used in rural areas, such as large buried depth and large pipe diameter, high cost, easy clogging, easy leakage, cumbersome construction, long construction period, difficult maintenance, poor environmental sanitation conditions, many sewage stations, and difficult management. On the basis of retaining the existing vacuum pipeline laying method and maintaining the advantages and foundations of the existing outdoor vacuum drainage system with small pipe diameter, shallow buried depth, no leakage, no impact on the surrounding environment, convenient and fast construction, short construction period, and long transportation distance, the flow state conversion function of the collection box in the existing system is firstly combined with the interception and septic tank function of the traditional household septic tank , realizing the three-phase separation of gas, liquid and solid in sewage, avoiding large pollutants from entering the pipeline network, and effectively avoiding the problem of vacuum pipe blockage; at the same time, the form of the vacuum pump station is changed from the traditional above-ground + underground type to a prefabricated buried pump station, which not only meets the relevant regulations on the use of agricultural land, but also shortens and simplifies the construction period and steps; in addition, the deodorizing biological filter tank installed at the outlet of the vacuum pump exhaust pipe is changed to an ozone deodorizing device installed in the vacuum pump station. While avoiding secondary pollution, it improves the disadvantages of the biological filter tank being greatly affected by the environment, the large workload of later maintenance, the inability to operate intermittently, and the need for professionals for management and operation. The operation is simpler, the treatment effect is more stable, and the floor space is saved.

[0053] The present invention comprises a septic tank 4, a vacuum drainage pipeline and a control valve, an underground vacuum tank 12, an underground prefabricated vacuum pump station 14 (including a vacuum pump, a drainage pump, a submersible sewage pump 141, an ozone deodorization device, an outdoor power distribution cabinet 18 and a control cabinet 17), and its main process is as follows: the indoor gravity drainage system of the farmer's household is discharged to the outdoor septic tank 4 of each household through the gravity outlet pipe 2 for solid-liquid separation (the sludge sediment is regularly cleaned by the farmer or a special person); the indoor gravity drainage pipeline is provided with a top ventilation pipe 1 , which helps to balance the air pressure in the septic tank 4, so that the vacuum valve 49 works normally, and can replace the air inlet pipe of the existing finished product collection box; if there are too many pipes or the pipes are not smooth between the septic tank 4 and the gravity outlet pipe 2, a third inspection well 3 can be added to connect them; when the sewage in the third compartment connecting the vacuum suction pipe and the vacuum valve in the septic tank 4 reaches a preset volume, the water pressure of the sensing pipe activates the pneumatic controller, which opens the vacuum valve 49, and the sewage in the third compartment (sewage suction tank) is discharged outside. Under the combined effect of atmospheric pressure and vacuum negative pressure in the pipe, the sewage is quickly discharged; a large amount of air enters the vacuum pipe behind the vacuum valve 49 along with the sewage (the air-water ratio is about 3:1 to 15:1), pushing the sewage along the pipe to the buried vacuum tank 12; when the water level in the buried vacuum tank 12 reaches a certain height, the drainage pump in the buried prefabricated vacuum pump station 14 automatically starts to discharge the sewage in the tank to the sewage treatment station or the municipal sewage network, and automatically stops when the water level reaches the predetermined low level; the drainage pump in the buried prefabricated vacuum pump station 14 automatically starts to discharge the sewage in the tank to the sewage treatment station or the municipal sewage network, and automatically stops when the water level reaches the predetermined low level; The suction pipe of the vacuum pump in the vacuum pump station 14 is connected to the top of the buried vacuum tank 12. The vacuum pump is automatically started and stopped through the pressure sensor on the suction pipe according to the vacuum degree in the tank to maintain the vacuum pressure in the tank between -0.06MPa and -0.07MPa; the vacuum pump and the drainage pump are not started at the same time; the ozone generated by the ozone generator 146 is mixed with the gas discharged by the vacuum pump in the ejector through the rotor flowmeter and then discharged to the outside; the design calculation of the system is carried out in accordance with CECS316:2012;

[0054] 1. Septic tank:

[0055] The septic tank 4 is an important component of the outdoor vacuum drainage system. It is not only a converter between gravity drainage and vacuum drainage, but also a storage container with a certain volume for intercepting feces and large sediments. It is divided into two independent schemes according to whether the compartment where the vacuum valve is located is combined with the feces interception space.

[0056] Solution 1

[0057] like Figure 2As shown, the upper valve chamber 46 and the lower feces interception space 45 adopt an integrated structure; the lower part of the septic tank 4 is divided into three compartments, the first compartment, the second compartment and the third compartment, and the volumes occupied by the three compartments are 50%, 25% and 25% respectively; the first two compartments have the function of intercepting large pieces of dirt and feces, and the total effective volume is about 1 cubic meter; the third compartment collects relatively clean sewage as a suction trough for vacuum pipes to suck sewage; above the suction trough is a valve chamber 46 with an independent space, and a vacuum valve 49, a controller 48, an upper port of a sensing tube 413, a pressure transmitter interface 412 and connecting pipelines including a pneumatic pipeline are arranged in the valve chamber 46; the vacuum suction pipe and the sensing tube 413 pass through the bottom of the valve chamber 47 and extend into the compartment 3 at a distance of 0.05 to 0.1 m from the bottom of the suction trough.

[0058] The three compartments of the lower space of the septic tank 4 are connected by holes, wherein the top of the first partition is not less than 0.1m from the top plate, and the top of the second partition is not less than 0.05m lower than the bottom elevation of the gravity drainage pipe; the first partition is more than 0.5m away from the bottom of the tank and has at least 2 water holes (size not less than 0.1x0.1m). The top of the first compartment is provided with a first inspection well 41 leading to the ground, and the top between the second and third compartments is provided with a second inspection well 43 leading to the ground; the manhole cover and well seat of the valve chamber and the inspection well are heavy-duty protective manhole covers and well seats; the manhole cover of the valve chamber should be airtight and without ventilation holes; the soil thickness of the septic tank 4 is not less than 0.3m; the septic tank 4 is made of corrosion-resistant and easy-to-construct glass fiber reinforced plastic or PE material as a whole, and its structural requirements refer to the industry standard "Technical Requirements for Glass Fiber Reinforced Plastic Septic Tanks" (CJ / T409-2012), and the shape is rectangular or elliptical.

[0059] The working principle of the septic tank 4 is sedimentation-decomposition-separation; when the sewage is discharged into the first two compartments of the septic tank 4, the solid matter with a larger specific gravity and parasite eggs are precipitated to the bottom of the tank, and the sewage after fermentation and decomposition is divided into a paste-like floating skin and a clarified sewage liquid solid waste residue. The sewage liquid treated by the second compartment is further rendered harmless; the waste liquid flowing into the third compartment is generally decomposed, and the pathogens and parasite eggs therein have been basically killed, and the sewage at this time has been basically rendered harmless; the sewage flowing into the third compartment is temporarily stored in the sewage suction tank, and the water pressure (water level) change is transmitted to the controller 48 through the induction tube. When the sewage volume reaches the preset volume, the controller 48 controls the vacuum valve 49 switches from a closed state to an open state, the sewage in the suction tank is connected to the vacuum pipe, the sewage is sucked into the vacuum pipeline, and after a certain amount of sewage and air are sucked in, the liquid level in the suction tank drops, and the vacuum valve 49 automatically resets; the controller 48 can adjust the opening time of the vacuum valve 49 and the flow rate of the gas-liquid mixture; the system uses a field bus network to monitor the opening state of the vacuum valve 49 in the collection box and the ultra-high liquid level state signal of the sewage in the suction tank to ensure its normal operation; the sewage and waste water treated by the septic tank 4 completes the solid-liquid separation process, and the solid waste residue is retained in the first two compartments of the septic tank, and the sewage and waste gas are discharged into the vacuum pipe and finally discharged into the buried vacuum tank 12.

[0060] The sludge deposited at the bottom of the pool must be cleared out in time to prevent sediment and sludge from entering the suction tank and affecting the operation of the vacuum drainage system; the sludge cleaning cycle is 3 to 6 months.

[0061] The vacuum valve 49 is an important equipment in the vacuum drainage system. It is an interface valve that isolates the vacuum state and the atmospheric state in the vacuum drainage system. The vacuum valve 49, the matching controller 48 and the pneumatic pipeline are all purchased as finished products. The vacuum valve 49 adopts a corrosion-resistant negative pressure pneumatic diaphragm vacuum valve or a piston angle seat valve. The opening and closing of the valve is controlled by vacuum pneumatics, and the sewage level is transmitted by the induction tube. The operating pressure should be -1.25~-2kPa (should not be greater than -0.15KPa), and the opening time range is 3~10s; the valve diameter is 75mm and the material is ABS; a manual button is provided, and the vacuum valve 49 can be manually controlled to open; a check valve 143 is provided on the hose connecting the vacuum port and the controller 48 to prevent humid gas from entering the controller from the vacuum pipeline.

[0062] In order to conveniently check the working times of the vacuum valve 49, a 6-digit working counter is set in the transparent observation window at the valve bonnet, and a non-contact valve position switch is provided at the valve bonnet to transmit the vacuum valve status to the monitoring system through a signal cable.

[0063] The high liquid level alarm device adopts a pressure transmitter, and the pressure probe is extended into the bottom of the suction tank through the pressure transmitter interface at the bottom of the valve chamber and fixedly installed; when the liquid level in the collection box reaches the alarm level, the high liquid level alarm signal is transmitted to the monitoring system.

[0064] The valve chamber of the septic collection box is equipped with a real-time monitoring system to monitor the opening status of the vacuum valve and the high alarm liquid level, which will eventually be displayed on the control cabinet of the vacuum pump station; an alarm monitoring line interface is provided on the side wall of the valve chamber, and the monitoring cables of the vacuum valve and liquid level alarm device are connected to the system monitoring cables laid in the same trench as the vacuum pipeline for unified burial.

[0065] The vacuum suction pipe and the induction pipe 413 can be made of corrosion-resistant materials such as polyethylene (PE) and polyvinyl chloride (PVC).

[0066] Solution 2

[0067] like Figure 3 As shown, the valve chamber 46 and the feces interception space 45 are separately arranged, and the vacuum valve 49 is arranged in an independent valve box;

[0068] The vacuum sewage suction pipe and the induction tube 413 pass through the bottom of the valve box, and extend into the sewage suction trough from the side wall of the third compartment of the septic tank 0.1m away from the bottom; the pressure probe of the pressure transmitter extends from the top pressure probe interface of the third compartment into the bottom of the sewage suction trough for fixed installation; the pressure transmitter is arranged in the valve box; the valve box and the box cover can be made of polyethylene (PE), polyvinyl chloride (PVC) or synthetic materials; the box cover should be airtight without ventilation holes; when the top cover is set on the hardened ground, a heavy-duty protective manhole cover and manhole seat are added on the plastic top cover of the valve box.

[0069] The rest of the scheme is the same as scheme 1.

[0070] 2. Vacuum drainage pipeline and control valve:

[0071] The pipeline of the vacuum drainage system consists of a vacuum discharge pipe 5, a vacuum drainage branch pipe 7, a vacuum drainage main pipe 6 and an inspection pipe; the vacuum pipeline is laid in a zigzag or bag shape, the minimum slope of the vacuum pipeline between the lifting bends or U-shaped bends is 0.002, and the spacing between the lifting bends in the zigzag laying method is between 6 and 100m; drainage does not require a gravity slope, and upward transportation along the slope is allowed. When the pipeline climbs continuously, a U-shaped bend is set before the 45° ascending section; an inspection pipe leading to the ground is set at each lifting bend or U-shaped pipe; the flow rate of the vacuum pipeline is controlled at 3 to 7m / s.

[0072] The pipeline shall be made of high-density polyethylene (HDPE) pipes and homogeneous pipe fittings, connected by electric fusion; or made of rigid polyvinyl chloride (PVC-U) pipes and homogeneous pipe fittings, bonded; the nominal pressure of the pipeline shall be ≧1MPa; the construction and installation of the pipeline shall refer to the industry standards "Technical Code for Buried Polyethylene Water Supply Pipeline Engineering" CJJ101 and "Technical Code for Buried Rigid Polyvinyl Chloride Water Supply Pipeline Engineering" CECS17.

[0073] When the vacuum drainage branch pipe 7 is connected to the vacuum drainage main pipe 6 and the length of the straight pipeline is greater than 400m, a maintenance valve should be installed; the valve should use a maintenance-free direct-buried gate with a corrosion-resistant inner wall, and the nominal pressure of the valve should be ≧1MPa.

[0074] 3. Underground vacuum tank:

[0075] The pressure in the underground vacuum tank 12 is maintained within -0.06~-0.07MPa, and the tank body pressure should not be less than -0.095MPa; the highest liquid level in the underground vacuum tank 12 should not exceed 1 / 2 of the effective height of the tank body. When the highest liquid level is exceeded, the liquid level control signal in the tank should automatically shut down the vacuum pump and alarm; a pressure level transmitter is installed on the side wall of the tank, and 4 liquid level control points (drain pump start and stop levels, ultra-high and ultra-low alarm levels) are set; the vacuum tank is made of carbon steel material welding, and the inner and outer walls are treated with anti-corrosion (such as coating with epoxy resin). The tank body is rectangular or elliptical in shape and installed horizontally; the vacuum tank is provided with an inspection hole on the ground; the thickness of the soil covering the top of the tank should be not less than 0.4m to facilitate ground greening and anti-floating; the design of the vacuum tank should take into account the influence of buoyancy and be firmly fixed to the foundation; the schematic diagram of the underground vacuum tank + underground vacuum pump station is shown in Figure 4 .

[0076] 4. Underground prefabricated vacuum pump station:

[0077] The underground prefabricated vacuum pump station 14 is the core of the outdoor vacuum drainage system. It should be located close to the sewage treatment station or in the center of the vacuum drainage system. The underground prefabricated vacuum pump station 14 adopts an underground integrated structure, which is equipped with a vacuum pump, sewage pump, submersible sewage pump 141, and ozone deodorization device. The ground outside the pump station is equipped with a power distribution cabinet and a control cabinet. The vacuum pump sucks the gas in the vacuum tank into the deodorization device for treatment and then discharges it. The drainage pump discharges the sewage to the sewage treatment station or the municipal sewage pipeline, and the gas-liquid separation process is completed in the vacuum pump station. Figure 4 shown.

[0078] 1. Vacuum pump

[0079] The vacuum pump shall be a standardized product. It is advisable to select two or more rotary vane vacuum pumps with the same operating capacity, low noise and high efficiency, one of which is a spare pump; the air inlet pipe of the vacuum pump is connected to the top of the buried vacuum tank, and the air outlet pipe of the vacuum pump is connected to the deodorizing device; the air inlet and outlet pipes of the vacuum pump are both provided with control valves and rubber joints; a pressure sensor 1411 is provided on the air inlet main pipe of the vacuum pump group and is interlocked with the vacuum pump control system to automatically start and stop the vacuum pump according to the vacuum degree; a vacuum gauge is provided on the air outlet main pipe of the vacuum pump group for on-site maintenance personnel to visually inspect the vacuum degree of the system; in order to save installation space, the vacuum pump is installed with a channel steel frame stacked up and down.

[0080] 2. Sewage pump

[0081] Two or more centrifugal drainage pumps of the same model, low-noise dry installation, with cutting function should be selected, and a spare pump should be set; the sewage pump is connected to the bottom of the buried vacuum tank, and its drainage capacity should meet the drainage requirements of the vacuum tank; a rubber joint and a special sewage gate valve are installed on the sewage pump suction pipe, and a rubber joint, a pressure gauge, a special sewage check valve 143 and a gate valve 144 are installed on the outlet pipe; the drainage pump should be able to work normally under a negative pressure of -0.06MPa to -0.07MPa; the start and stop of the sewage pump is controlled by the vacuum tank level control device (pressure transmitter); a channel steel base 1412 is installed at the bottom of the drainage pump to connect to the ground of the vacuum pump station.

[0082] 3. Submersible sewage pump

[0083] A small amount of water leaks from the pipeline in the vacuum pump station and flows into the sump 142, and is discharged under pressure by a submersible sewage pump with a flow rate of not less than 0.5L / S and a lift not less than the lift of the drainage pump; a sewage-specific check valve 143 and a gate valve 144 are provided on the outlet pipe of the submersible sewage pump 141; the drainage pipe of the submersible sewage pump 141 is combined with the discharge pipe of the drainage pump and then discharged to the outside; the submersible sewage pump 141 is automatically started and stopped by the liquid level control system.

[0084] 4. Ozone deodorization device

[0085] Ozone has a strong oxidizing ability, and its redox potential is 2.07V, second only to fluorine, and higher than chlorine and chlorine dioxide. The main components of the odor emitted by sewage and wastewater discharged from rural areas are hydrogen sulfide, sulfur compounds such as mercaptans and sulfides, amines such as ammonia and amines, alcohols, fats, aldehydes and dozens of other substances, among which hydrogen sulfide and ammonia are the most abundant. Under the action of ozone, these malodorous gases are decomposed into small molecules, water and harmless gases, thereby achieving the purpose of deodorization.

[0086] The ozone deodorization device is arranged in the vacuum pump station, and mainly comprises an ozone generator 146, a rotor flowmeter 145, a pressure regulating valve and an ejector; the odor and ozone are transported to the ejector under the action of the vacuum pump and the ozone generator respectively, and the two are fully mixed and reacted therein, and the odorless substances after the reaction are discharged into the outdoor atmosphere through a pipeline, and the outdoor exhaust outlet should be not less than 0.8m above the ground, with a bend at the end, and a 20-30 mesh stainless steel mesh cover at the pipe mouth to prevent insects; the ozone generator adopts an air source and air cooling type equipment, and the ozone generation amount is controlled at 1-2g / cubic meter*hour.

[0087] 5. Pipes and valves

[0088] When galvanized steel pipes are used for vacuum pipes and pressure drainage pipes, threaded connection is adopted when DN≦80, and groove connection is adopted when DN>80; when plastic water supply pipes such as ABS, CPVC, PVC-U are used for vacuum pipes and pressure drainage pipes, bonding is adopted; ozone pipes are made of polybutylene (PB) pipes, which are welded, or S31603, S31608 thin-walled stainless steel pipes are used, which are socket welded (when welding, inert gas protection should be provided at the weld joint).

[0089] The valves and accessories on the ozone pipeline should be resistant to ozone; the nominal pressure of the valves on the vacuum pipe and pressure drain pipe should be no less than 1MPa.

[0090] 6. Power supply and control requirements

[0091] The power supply of the underground prefabricated vacuum pump station adopts dual power supply or dual circuit; the drainage pump and the vacuum pump do not work at the same time; the start and stop linkage control of the ozone generator and the vacuum pump is operated; the vacuum pump station should be able to send out a fault signal in the event of a power outage; when the water level in the vacuum tank is too high or too low, the drainage pump or the vacuum pump stops working, the vacuum pump or the drainage pump runs overtime, or the vacuum degree in the vacuum tank is too high or too low, the control system of the pump station should be able to alarm; the control system is equipped with an equipment monitoring system and a remote monitoring access port.

[0092] The outdoor ground of the buried prefabricated vacuum pump station is equipped with rainproof and dustproof control cabinets and distribution cabinets with a protection level not less than IP65; the control cabinet and distribution cabinet use concrete foundations, and the foundation surface is not less than 0.5m above the ground to prevent flooding.

[0093] 7. Others

[0094] The underground prefabricated vacuum pump station is prefabricated in an integrated manner in the factory and buried on site; the thickness of the soil covering the top plate of the prefabricated pump station should be no less than 0.4m to facilitate ground greening coverage and anti-floating; the design of the pump station should take into account the influence of buoyancy and be firmly fixed to the foundation; the manhole 148 of the pump station is no less than 0.5m above the ground to prevent flooding; a 0.4m wide stainless steel ladder is installed at the manhole to facilitate personnel entry and exit; the pump station is made of corrosion-resistant and easy-to-construct fiberglass or PE material as a whole, and the shape is rectangular or square; the top plate of the pump station is equipped with a non-powered wind hood 1410, which is no less than 0.7m above the ground.

[0095] Other requirements within the vacuum pump station shall comply with the provisions of the Technical Code for Outdoor Vacuum Drainage Systems (CECS316:2012).

[0096] The invention is an outdoor vacuum drainage system that meets the conditions for use in rural areas and can be used to replace the traditional outdoor gravity drainage system and the existing outdoor vacuum drainage system. The chamber where the vacuum valve is located in the invention can be combined with the feces interception space or set separately; the septic tank and its accessories are allowed to adopt more shapes such as cylindrical, composite materials, HDPE, stainless steel and other materials in addition to the above preferred shapes and materials; the vacuum valve is allowed to adopt other calibers such as 60mm and 90mm in addition to the above preferred diameter; the vacuum valve is allowed to adopt pneumatic-electric valves and electric valves in addition to the above preferred pneumatic valves; the vacuum tank can also adopt vertical tanks in addition to the above preferred horizontal tanks; the vacuum tank can also adopt more shapes such as cylindrical, and adopt various materials such as plastic (or composite materials) in addition to the above preferred buried laying; the vacuum tank can also be set in the vacuum pump station in addition to the above preferred materials and shapes; the prefabricated vacuum pump station can adopt more materials such as composite materials, reinforced concrete, and more shapes such as cylindrical and polygonal in addition to the above preferred materials and shapes; the mixed reactor of the ozone deodorization device can also adopt other mixed reaction devices such as reaction tanks and reactors in addition to the above preferred ejectors. All the above claims should be protected.

[0097] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A rural outdoor vacuum drainage system, characterized in that: include: Septic tank, vacuum drainage pipe and control valve, underground vacuum tank, underground prefabricated vacuum pump station, The indoor gravity drainage system of the farmer's household is discharged to the outdoor septic tank of each household through the gravity outlet pipe for solid-liquid separation; the indoor gravity drainage pipe of the farmer's household is provided with a top-extending ventilation pipe; the septic tank is connected to the underground vacuum tank through the vacuum drainage pipe and the control valve, and the underground vacuum tank is connected to the underground prefabricated vacuum pump station; The septic tank is used as a converter between gravity drainage and vacuum drainage, and is also used as a container for intercepting feces and large sediments of a certain volume; depending on whether the compartment where the vacuum valve is located is combined with the feces interception space, it is divided into two independent schemes: The first type: the septic tank comprises an upper valve chamber and a lower feces interception space, and the upper valve chamber and the lower feces interception space adopt an integrated structure; wherein the lower feces interception space is divided into three compartments, namely, the first compartment, the second compartment and the third compartment, and the volumes occupied by the three compartments are 50%, 25% and 25% respectively; the first two compartments, namely, the first compartment and the second compartment, have the function of intercepting large pieces of dirt and feces; the third compartment collects relatively clean sewage as a suction trough for vacuum pipes to suck sewage; above the suction trough is a valve chamber with an independent space, in which a vacuum valve, a controller, an upper port of a sensing tube, a pressure transmitter and connecting pipelines including a pneumatic tube are arranged; the vacuum suction pipe and the sensing tube pass through the bottom of the valve chamber and extend into the third compartment at a distance of 0.05 to 0.1 m from the bottom of the suction trough; The three compartments in the lower space of the septic tank are connected by holes, where the top of the first partition is not less than 0.1m from the top plate, and the top of the second partition is not less than 0.05m lower than the bottom elevation of the gravity drainage pipe; the first partition is more than 0.5m away from the bottom of the tank and has at least 2 water holes; the top of the first compartment is provided with a first inspection well connected to the ground, and the top between the second and third compartments is provided with a second inspection well connected to the ground; the manhole covers and well seats of the valve chamber and the inspection wells are heavy-duty protective manhole covers and well seats; the manhole cover of the valve chamber should be airtight and without ventilation holes; the soil thickness of the septic tank is not less than 0.3m; the septic tank is made of corrosion-resistant and easy-to-construct fiberglass or PE material; When the sewage is discharged into the first two compartments of the septic tank, the solid matter with a larger specific gravity and parasite eggs settle to the bottom of the tank. After fermentation and decomposition, the sewage is divided into a paste-like floating skin and a clear sewage liquid-like solid waste residue. The sewage liquid treated in the second compartment is further rendered harmless; the waste liquid flowing into the third compartment is generally decomposed; the sewage flowing into the third compartment is temporarily stored in the suction tank, and the water pressure change is transmitted to the controller through the induction tube. When the sewage volume reaches the preset volume, the controller controls the vacuum valve to switch from the closed state to the open state, and the sewage in the suction tank is connected to the vacuum pipe, and the sewage is sucked into the vacuum pipeline. After a certain amount of sewage and air are sucked in, the liquid level of the suction tank drops and the vacuum valve is automatically reset; the controller can adjust the opening time of the vacuum valve and the flow rate of the gas-liquid mixture; the sewage treated by the septic tank completes the solid-liquid separation process, and the solid waste residue is retained in the first two compartments of the septic tank. The sewage and waste gas are discharged into the vacuum pipe and finally discharged into the vacuum tank; The second type: the septic tank comprises an upper valve box and a lower feces interception space, the valve box and the feces interception space are separately arranged, and the vacuum valve is arranged in an independent valve box; The vacuum sewage suction pipe and the induction pipe pass through the bottom of the valve box and extend into the sewage suction tank from the side wall of the third compartment of the feces interception space 0.1m from the bottom; the pressure probe of the pressure transmitter extends from the top pressure probe interface of the third compartment into the bottom of the sewage suction tank for fixed installation; the pressure transmitter is installed in the valve box; the box cover should be airtight without vents; when the top cover is installed on the hardened ground, a heavy-duty protective manhole cover and manhole seat are added on top of the plastic top cover of the valve box; The lower feces interception space is divided into three compartments, the first compartment, the second compartment and the third compartment, and the volumes of the three compartments are 50%, 25% and 25% respectively; the first two compartments, the first compartment and the second compartment, have the function of intercepting large pieces of dirt and feces; the third compartment collects relatively clean sewage as a sewage suction tank for vacuum pipes to suck sewage; The three compartments in the lower space of the septic tank are connected by holes, where the top of the first partition is not less than 0.1m from the top plate, and the top of the second partition is not less than 0.05m lower than the bottom elevation of the gravity drainage pipe; the first partition is more than 0.5m away from the bottom of the tank and has at least 2 water holes; the top of the first compartment is provided with a first inspection well connected to the ground, and the top between the second and third compartments is provided with a second inspection well connected to the ground; the manhole cover and well seat of the inspection well are heavy-duty protective manhole covers and well seats; the soil thickness of the septic tank is not less than 0.3m; the septic tank is made of corrosion-resistant and easy-to-construct fiberglass or PE material; When the sewage is discharged into the first two compartments of the septic tank, the solid matter with a larger specific gravity and parasite eggs settle to the bottom of the tank. After fermentation and decomposition, the sewage is divided into a paste-like floating skin and a clarified sewage liquid-like solid waste residue. The sewage liquid treated in the second compartment is further rendered harmless; the waste liquid flowing into the third compartment is generally decomposed; the sewage flowing into the third compartment is temporarily stored in the suction tank, and the water pressure change is transmitted to the controller through the induction tube. When the sewage volume reaches the preset volume, the controller controls the vacuum valve to switch from the closed state to the open state, and the sewage in the suction tank is connected to the vacuum pipe, and the sewage is sucked into the vacuum pipeline. After a certain amount of sewage and air are sucked in, the liquid level of the suction tank drops and the vacuum valve is automatically reset; the controller can adjust the opening time of the vacuum valve and the flow rate of the gas-liquid mixture; the sewage treated by the septic tank completes the solid-liquid separation process, and the solid waste residue is retained in the first two compartments of the septic tank. The sewage and waste gas are discharged into the vacuum pipe and finally discharged into the vacuum tank; The pipelines of the vacuum drainage system include a vacuum discharge pipe, a vacuum drainage branch pipe, a vacuum drainage main pipe and a first inspection pipe; wherein the vacuum pipeline is laid in a zigzag or bag shape, the minimum slope of the vacuum pipeline between the lifting bends or U-shaped bends is 0.002, and the spacing between the lifting bends in the zigzag laying method is between 6 and 100m; drainage does not require a gravity slope, and upward transportation along the slope is allowed. When the pipeline climbs continuously, a U-shaped bend is set before the 45° rising section; an inspection pipe leading to the ground is set at each lifting bend or U-shaped pipe; the flow rate of the vacuum pipeline is controlled at 3 to 7m / s.

2. A rural outdoor vacuum drainage system according to claim 1, characterized in that: A third inspection well is provided between the septic tank and the gravity outlet pipe.

3. A rural outdoor vacuum drainage system according to claim 1, characterized in that: The vacuum pipeline adopts high-density polyethylene pipes and homogeneous pipe fittings, connected by electric fusion; or adopts rigid polyvinyl chloride pipes and homogeneous pipe fittings, bonded; when the branch pipe of the vacuum pipeline is connected to the main pipe and the length of the straight pipe is greater than 400m, a maintenance valve should be installed.

4. A rural outdoor vacuum drainage system according to claim 1 or 2, characterized in that: The pressure inside the buried vacuum tank is maintained between -0.06 and -0.07 MPa, and the tank body pressure should not be less than -0.095 MPa; the maximum liquid level in the buried vacuum tank should not exceed 1 / 2 of the effective height of the tank body.

5. A rural outdoor vacuum drainage system according to claim 1 or 2, characterized in that: The underground prefabricated vacuum pump station is arranged near the sewage treatment station or in the center of the vacuum drainage system; it adopts an underground integrated structure, and is equipped with a vacuum pump, a drainage pump, a submersible sewage pump, and an ozone deodorization device. A power distribution cabinet and a control cabinet are arranged on the ground outside the pump station. The vacuum pump sucks the gas in the underground vacuum tank into the deodorization device for treatment and then discharges it. The drainage pump discharges the sewage and waste water to the sewage treatment station or the municipal sewage pipeline, and the gas-liquid separation process is completed in the vacuum pump station.

6. A rural outdoor vacuum drainage system according to claim 5, characterized in that: The vacuum pumps are two or more rotary vane vacuum pumps with the same operating capacity, low noise and high efficiency, one of which is a spare pump; the vacuum pump air inlet pipe is connected to the top of the buried vacuum tank, and the vacuum pump air outlet pipe is connected to the ozone deodorization device.

7. A rural outdoor vacuum drainage system according to claim 5, characterized in that: The drainage pumps shall be two or more centrifugal drainage pumps of the same model, low-noise dry-type installation, with cutting function, and a spare pump shall be set; the drainage pump shall be connected to the bottom of the buried vacuum tank, and its drainage capacity shall meet the drainage requirements of the vacuum tank.

8. A rural outdoor vacuum drainage system according to claim 5, characterized in that: A sump is arranged in the buried prefabricated vacuum pump station, and the sump is used to collect a small amount of water leaking from the pipeline. A submersible sewage pump is arranged in the sump, and a sewage-specific check valve and a gate valve are arranged on the outlet pipe of the submersible sewage pump; the drainage pipe of the submersible sewage pump is combined with the discharge pipe of the drainage pump and then discharged to the outside.

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