CN210066942U - Rural outdoor vacuum drainage system - Google Patents

Abstract

The utility model discloses a rural outdoor vacuum drainage system. The system is mainly composed of septic collection box, vacuum drainage pipeline and control valve, buried vacuum tank, and buried prefabricated vacuum pump station. The combination of manure function can prevent large pieces of dirt from entering the pipe network, which can effectively alleviate the problem of easy pipeline blockage; at the same time, the form of the vacuum pump station has been changed from the traditional above-ground + underground type to a buried prefabricated pump station, which can not only meet the needs of agricultural land use It also shortens and simplifies the construction period and steps; in addition, the deodorizing biological filter set at the outlet of the vacuum pump exhaust pipe is changed to an ozone deodorizing device set in the vacuum pump station to avoid secondary pollution and improve the The biological filter is greatly affected by the environment, the later maintenance workload is large, it cannot be operated intermittently, and the management operation requires professionals, etc., and saves the floor space.

Description

A rural outdoor vacuum drainage system

technical field

The utility model is suitable for the field of outdoor vacuum drainage in rural areas, and is suitable for short construction period, scattered drainage points, long drainage distance, flat terrain, narrow streets, need to cross obstacles such as water systems and pipelines, large buried depth of pipelines, high groundwater level, high population It can be used to replace the traditional outdoor gravity drainage system and the existing outdoor vacuum drainage system in occasions such as low density and water source protection area, especially involving a rural outdoor vacuum drainage system.

Background technique

In recent years, with the vigorous promotion of the construction of new rural areas and the construction of beautiful villages by the state, the collection and treatment of rural sewage involving rural water environment management has received key support from the state and local governments and has developed rapidly, and the network of rural sewage pipes has become a trend; A small number of villages that are close to urban areas and townships and meet the conditions for connecting to the urban sewage collection pipe network are included in the urban area and township sewage pipe network system, and the urban sewage treatment plants are centralized for treatment; most villages currently adopt the decentralized collection and treatment mode.

Rural domestic sewage, including washing, bathing, kitchen cooking, feces and washing, has the characteristics of 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 pipe, household three- or two-grid septic tank, sewage pipe network, intermediate lifting pump station) and terminal treatment facilities.

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

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

1. The system setting is greatly affected by the water system and obstacles. Usually, the water system should be naturally divided into several drainage basins, and the water collection pipe network and treatment facilities should be set up respectively. When the number of sewage treatment stations increases, the initial investment cost will be significantly increased. The operation and management of the sewage treatment station brings troubles.

2. Village drainage usually has a large watershed, a long main pipe, and a small flow rate. The minimum slope of the commonly used drainage pipe diameter is de200/300 of 0.004/0.002. The burial depth in front of the terminal treatment station can reach 3-5m; the trenches are deep, and dewatering construction is required in case of groundwater, and supporting piles are built to protect the construction, and the construction cost is high; the construction of rural sewage pipe network is caused by the deep trenches every year. Improper support measures resulted in casualties after the collapse.

3. Inspection wells need to be connected between the gravity drainage system pipes. On the one hand, the width of the grooves will be increased; on the other hand, in the rural road environment, the manhole covers with ventilation holes often enter various foreign objects and deposit in the wells, increasing the sludge At the same time, the odor and the breeding mosquitoes also pollute the surrounding environment through the ventilation holes.

4. When the gravity drainage pipeline with a large buried depth passes through the rural streets with a net width of 2-4m, the excavation of the deep trench poses a great threat to the shallow foundation of the farmhouse, and it is easy to cause the collapse of the farmhouse on the ground and the surrounding wall.

5. Due to the large investment cost of the sewage pipe network system, the construction unit often sacrifices the drainage slope to reduce costs and strive for profits; when the drainage slope is less than the minimum slope of the pipeline, the pipe network is easy to block, which brings difficulties to maintenance and management.

6. Gravity drainage system adopts socket interface between pipelines and between pipelines and inspection wells, which has a high water leakage rate and poses a threat to the safety of groundwater quality.

Vacuum drainage system is a drainage system that uses vacuum equipment to generate a certain degree of vacuum in the drainage pipeline and uses air pressure difference to transport the medium; the system is suitable for scattered drainage points, long drainage distance, flat terrain, need to cross obstacles, and high groundwater level. , low population density, water source protection areas, etc.

The vacuum drainage system was produced from 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 driven vacuum pump and cast iron vacuum pipes were used; in 1873, Amsterdam built the world's first vacuum drainage system, which was subsequently It was used in Paris, Berlin and other European cities. By 1905, there were thousands of toilets in Amsterdam using vacuum drainage. In 1956, Swedish engineer Joel Liljendhal practically modeled the vacuum connection valve device in the vacuum system.

From the 1960s to the 1990s, the vacuum drainage technology entered a stage of development and maturity. The U.S. Environmental Protection Agency broke through the two most critical problems in the outdoor vacuum drainage sewage collection system - vacuum interface valve and vacuum piping; In 1980, the system was first applied to the treatment of wastewater from hospital radiology departments. By the 1990s, vacuum drainage technology had reached the maturity of large-scale application in Europe and the United States, but it still needed to be further improved.

Since the 1990s, vacuum drainage technology has been perfected and optimized. Countries represented by Japan and the United States have improved the reliability of the system, improved system energy saving and equipment integration through the improvement of key components in the vacuum drainage system and the use of modern monitoring methods. So far, the vacuum drainage system has the basic characteristics of reliability, controllability, standardization, informationization, economic feasibility and environmental friendliness, and has reached the basic requirements of becoming a modern drainage system.

Through the introduction, digestion and absorption of foreign vacuum drainage technology, vacuum drainage has been firstly applied in railways (such as railway passenger car vacuum collection devices, Beijing-Shanghai high-speed railway ground sewage discharge system), buildings (such as Yantai Cultural Center indoor vacuum drainage system, Guangzhou Baiyun International Conference Center vacuum drainage system), municipal (such as the riverside vacuum sewage interception project, Jinan Juvenile Road rainwater emergency vacuum drainage system), ships (such as the new century cruise ship vacuum collection system, "Xuelong" polar expedition Ship vacuum collection system), aviation (such as MD-11 aircraft airborne vacuum sewage system DLV-1 airborne vacuum sewage system) and other fields.

In 2012, the China Engineering Construction Standards Association issued the recommended standard CECS316:2012 "Technical Specifications for Outdoor Vacuum Drainage System Engineering", which provided a basis for standardizing the design and installation of outdoor vacuum drainage systems. The existing outdoor vacuum drainage system in China refers to the relevant requirements of European standards; the length of the vacuum main pipe of a single vacuum pump station is less than or equal to 4Km; the cumulative climbing height of the vacuum drainage main pipe is less than or equal to 5m (the maximum cumulative height should be corrected according to the local altitude); A finished product collection box is installed between the indoor gravity pipeline and the outdoor vacuum pipeline to convert gravity and vacuum flow state; the vacuum pipeline is laid in a zigzag or bag shape, and the minimum slope of the vacuum pipeline between the lifting bend or U-shaped bend is 0.002, and the lifting The distance between the bends is between 6 and 100m; each lifting bend or U-shaped pipe is provided with an inspection pipe leading to the ground; the drainage does not need a gravity slope, allowing upward transportation along the slope; each vacuum drainage system is provided with a vacuum tank , It can be buried outside the vacuum pump station or installed in the vacuum pump station; the vacuum pump station building is composed of ground and underground parts. Part of the power distribution cabinet and control cabinet are set up; the outlet of the drainage pump is connected to the sewage treatment facility or the municipal sewage pipe network; the exhaust pipe of the vacuum pump is discharged after being deodorized by the outdoor deodorizing biological filter; the vacuum pump station adopts dual power supply or dual circuit power supply.

The outdoor vacuum drainage system is characterized by small pipe diameter (de80-200), shallow burial depth (0.7-1.1m), narrow groove, no need to set up inspection wells, no precipitation construction, no supporting piles for the groove, and no drainage system. Influenced by obstacles, fewer sewage treatment stations, convenient and fast construction, and short construction period, it greatly reduces the investment cost of sewage pipe network system compared with gravity drainage system; at the same time, the vacuum drainage system is fully sealed without leakage and no odor overflow. , the sanitary conditions are superior to the gravity system; in addition, the vacuum drainage system has a large flow rate, the pipe network is not easy to block, and the later maintenance cost of the pipe network is lower than that of the gravity system; due to the shallow groove of the pipeline, casualties and farmhouse building collapses are also avoided; To sum up, the comprehensive advantages of outdoor vacuum drainage system to replace outdoor gravity drainage system are obvious.

When the existing outdoor vacuum drainage system is used in rural areas, there are still the following problems that need to be solved:

1. When the gravity drainage system is adopted in the countryside, a septic tank is installed on the outlet pipe of each household. The septic tank can retain large pieces of dirt and feces (the farmers can clean up by themselves). It is a very simple and effective measure; however, the volume of the sewage collection chamber of the sewage collection tank set up between the household outlet pipe and the sewage main pipe of the current outdoor vacuum drainage system is too small to effectively retain large pieces of dirt and feces. It is not convenient for farmers to clean up the pollution.

2. According to the regulations of the Bureau of Land and Resources, it is required that the vacuum pump station and the sewage treatment station shall not occupy arable land, and should not occupy the agricultural land, and try to use the capital construction land; the basic construction land that can be provided in the countryside is currently scarce, and agricultural land needs to be occupied in most occasions , As long as there are buildings above the ground of agricultural land, it is illegal construction, so the vacuum pump station cannot have above-ground buildings, but can only be made into an all-underground structure.

3. "Technical Regulations for Outdoor Vacuum Drainage System Engineering" (CECS316:2012) recommends the use of deodorizing biological filters to treat the exhaust of the vacuum pump, which not only covers a large area, but also the pollutants retained from the exhaust gas are attached to the open air. In the filter material layer, there is secondary pollution to the environment itself, and it is easy to breed mosquitoes and flies. In addition, the biological filter is also greatly affected by the environment (especially in northern winter). The later maintenance workload is large, and it cannot be operated intermittently. Professional management is required. and other disadvantages.

To sum up, although the outdoor vacuum drainage system is superior to the gravity drainage system, the above-mentioned three core parts of the system need to be greatly improved in order to adapt to the construction of the rural sewage pipe network system.

Utility model content

In view of the technical problems existing in the above-mentioned prior art, the purpose of this utility model is to provide a rural outdoor vacuum drainage system.

In order to achieve the purpose of the utility model, the utility model provides a rural outdoor vacuum drainage system, including: a septic collection box, a vacuum drainage pipeline and a control valve, a buried vacuum tank, and a buried prefabricated vacuum pump station,

The farmer's indoor gravity drainage system is discharged to the septic collection box outside each household through the gravity outlet pipe for solid-liquid separation; the farmer's indoor gravity drainage pipe is provided with an extended top ventilation pipe; the septic collection box is passed through the vacuum drainage pipe. And the control valve is connected with the buried vacuum tank, and the buried vacuum tank is connected with the buried prefabricated vacuum pump station.

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

Among them, the septic collection box is used for the converter of gravity drainage and vacuum drainage, and is also used for a certain volume of feces and large sediments. Together, there are two separate scenarios:

The first type: the septic collection box includes an upper valve chamber and a lower fecal storage space, and the upper valve chamber and the lower feces storage space adopt an integrated structure; wherein, the lower feces storage space is divided into Three grids, the first grid, the second grid and the third grid, and the volume of the three grids is 50%, 25%, 25% respectively; the first two grids, the first grid and the second grid , has the function of intercepting large pieces of dirt and feces; the third compartment collects relatively clean sewage as a sewage suction tank for vacuum pipeline suction sewage; above the sewage suction tank is a space independent valve chamber, and the valve chamber is equipped with a vacuum valve, The controller, the upper port of the induction pipe, the pressure transmitter and the connecting pipeline including the pneumatic pipe; the vacuum sewage suction pipe and the induction pipe extend through the bottom of the valve chamber into the third compartment, 0.05～0.1m from the bottom of the sewage suction tank place;

The three partitions in the lower space of the septic collection box are connected with openings. The distance between the top of the first partition board and the top board is not less than 0.1m, and the top of the second partition board is not lower than the bottom elevation of the gravity drainage pipe. less than 0.05m; no less than 2 water-passing holes are set on the first partition plate 0.5m above the bottom of the box; the top of the first compartment is provided with the first inspection well leading to the ground, the second compartment and the third compartment The top between the two inspection wells leading to the ground; the valve chamber and the manhole cover and the well seat of the inspection well are made of heavy-duty protective manhole cover and well seat; the manhole cover of the valve chamber should be sealed without ventilation holes; The thickness of the covering soil is not less than 0.3m; the whole septic collection box is made of FRP or PE material that is corrosion-resistant and convenient for construction;

When the sewage is discharged into the first two compartments of the septic collection box, the solid matter and parasite eggs with a large specific gravity will settle to the bottom of the tank. The waste residue, the sewage and waste liquid treated by the second compartment is further harmless; the waste liquid flowing into the third compartment is generally decomposed; the sewage flowing into the third compartment is temporarily stored in the sewage suction tank, and the water pressure changes through the induction tube It is transmitted to the controller. When the amount of sewage reaches the preset volume, the controller controls the vacuum valve to switch from the closed state to the open state, the sewage in the sewage suction tank is connected to the vacuum pipeline, the sewage is sucked into the vacuum pipeline, and a certain amount of sewage is sucked in. After mixing with air, the liquid level of the sewage suction tank drops, and the vacuum valve is automatically reset; the opening time of the vacuum valve and the flow rate of the gas-liquid mixture can be adjusted by the controller; During the process, the solid waste remains in the first two compartments of the septic collection box, and the sewage and waste gas are discharged into the vacuum pipeline and finally discharged into the vacuum tank.

The second type: the septic collection box includes an upper valve box and a lower feces storage space, the valve box and the feces storage space are set separately, 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 storage space at a distance of 0.1m from the bottom; the pressure probe of the pressure transmitter is pressed from the top of the third compartment. The probe interface extends 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 sealed without ventilation holes; when the top cover is installed on the hardened ground, a heavy-duty protection is added on the plastic top cover of the valve box Manhole covers and well bases;

Among them, the lower part of the feces storage space is divided into three compartments, the first compartment, the second compartment and the third compartment, and the volume of the three compartments is 50%, 25%, 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 pipe suction sewage;

The three partitions in the lower space of the septic collection box are connected with openings. The distance between the top of the first partition board and the top board is not less than 0.1m, and the top of the second partition board is not lower than the bottom elevation of the gravity drainage pipe. less than 0.05m; no less than 2 water-passing holes are set on the first partition plate 0.5m above the bottom of the box; the top of the first compartment is provided with the first inspection well leading to the ground, the second compartment and the third compartment The top of the inspection well is set up with a second inspection well leading to the ground; the well cover and well seat of the inspection well shall be heavy-duty protective well cover and well seat; the thickness of the covering soil of the septic collection box shall not be less than 0.3m; the whole septic collection box shall be made of corrosion-resistant , FRP or PE material with convenient construction;

When the sewage is discharged into the first two compartments of the septic collection box, the solid matter and parasite eggs with a large specific gravity will settle to the bottom of the tank. The waste residue, the sewage and waste liquid treated by the second compartment is further harmless; the waste liquid flowing into the third compartment is generally decomposed; the sewage flowing into the third compartment is temporarily stored in the sewage suction tank, and the water pressure changes through the induction tube It is transmitted to the controller. When the amount of sewage reaches the preset volume, the controller controls the vacuum valve to switch from the closed state to the open state, the sewage in the sewage suction tank is connected to the vacuum pipeline, the sewage is sucked into the vacuum pipeline, and a certain amount of sewage is sucked in. After mixing with air, the liquid level of the sewage suction tank drops, and the vacuum valve is automatically reset; the opening time of the vacuum valve and the flow rate of the gas-liquid mixture can be adjusted by the controller; During the process, the solid waste remains in the first two compartments of the septic collection box, and the sewage and waste gas are discharged into the vacuum pipeline and finally discharged into the vacuum tank.

Wherein, the pipeline of the vacuum drainage system includes a vacuum exhaust pipe, a vacuum drainage branch pipe, a vacuum drainage main pipe and a first inspection pipe; wherein, the vacuum pipeline adopts a zigzag or bag-shaped laying method, and the vacuum between the lifting bends or U-shaped bends is The minimum slope of the pipeline is 0.002, and the distance between the lifting bends of the zigzag laying method is between 6 and 100m; the drainage does not need a gravity slope, and the upward transportation is allowed. Each lifting bend or U-shaped pipe is provided with an inspection pipe leading to the ground; the flow rate of the vacuum pipe is controlled at 3-7m/s.

Among them, the vacuum pipeline adopts high-density polyethylene pipe and homogeneous pipe fittings, and is connected by electrofusion; or adopts rigid PVC pipe and homogeneous pipe fittings, and is bonded; the vacuum pipeline is connected to the main pipe as a branch pipe and the length of the straight pipeline is more than 400m When the maintenance valve should be installed.

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

Among them, the buried prefabricated vacuum pump station is located close to the sewage treatment station or in the center of the vacuum drainage system; it adopts a buried integrated structure, and is equipped with a vacuum pump, a drainage pump, a submersible sewage pump, and an 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 buried vacuum tank into the deodorization device for treatment and then discharges it. The drainage pump discharges the sewage to the sewage treatment station or municipal sewage pipeline. The process of gas-liquid separation is completed in the vacuum pump station.

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 backup pump; the intake pipe of the vacuum pump is connected to the top of the buried vacuum tank, and the vacuum pump The outlet pipe is connected to the ozone deodorizing device.

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

Wherein, a sump is set in the buried prefabricated vacuum pump station. The sump is used to collect a small amount of leaking water from the pipeline. The sump is provided with a submersible sewage pump, and the outlet pipe of the submersible sewage pump is provided with a set of submersible sewage pumps. Sewage special check valve and gate valve; the submersible sewage pump drainage pipe and the drainage pump discharge pipe are combined and discharged to the outdoor.

Compared with the prior art, the beneficial effect of the utility model is that the utility model relates to an outdoor vacuum drainage system for domestic sewage that meets the conditions of use in rural areas, and solves the problem of the buried depth and large pipe diameter of the outdoor gravity drainage system commonly used in rural areas. , high cost, easy blockage, easy leakage, cumbersome construction, long construction period, difficult maintenance, poor sanitation conditions, many sewage stations, difficult management and other problems; The outdoor vacuum drainage system has the advantages of small pipe diameter, shallow burial depth, no leakage, does not affect the surrounding environment, convenient and fast construction, short construction period, and long conveying distance. The function is combined with the interception function of the traditional household septic tank to realize the three-phase separation of sewage gas, liquid and solid, avoid large pollutants entering the pipe network, and effectively avoid the problem of vacuum pipeline blockage; at the same time, the form of the vacuum pump station is changed from The traditional above-ground + underground type is changed to a buried prefabricated pump station, which can not only meet the relevant regulations on agricultural land use, but also shorten and simplify the construction period and steps; in addition, the deodorization biological filter set at the outlet of the vacuum pump exhaust pipe It is changed to an ozone deodorization device located in the vacuum pump station. While avoiding secondary pollution, it improves the disadvantages of the biological filter, which is greatly affected by the environment, requires a large amount of maintenance work in the later period, cannot be operated intermittently, and requires professionals for management and operation. It is simple, the processing effect is more stable, and the floor space is saved.

Description of drawings

Fig. 1 shows the structural representation of the rural outdoor vacuum drainage system of the present application;

Fig. 2 shows the structural representation of the first embodiment of the septic collection box of the application;

Fig. 3 shows the structural representation of the second embodiment of the septic collection box of the application;

Fig. 4 shows the structural schematic diagram of the buried prefabricated vacuum pump station of the application;

In the figure, 1-vent 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-buried vacuum tank, 13-exhaust pipe, 14-buried prefabricated vacuum pump station, 15-pressure drain pipe , 16-floor, 17-control cabinet, 18-power distribution cabinet, 19-basic, 20-vacuum tank pressure transmitter interface,

41- first inspection well, 42- first inspection well cover, 43- second inspection well, 44- second inspection well cover, 45- excrement storage 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 pipe,

141-submersible sewage pump, 142-sump, 143-check valve, 144-gate valve, 145-rotameter, 146-ozone generator, 147-stop valve, 148-manhole, 149-exhaust pipe, 1410 - Unpowered hood, 1411 - Pressure sensor, 1412 - Channel steel base, 1413 - Exhaust pipe, 1414 - Vacuum gauge.

Detailed ways

The present utility model will be described in further 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 intended to limit the present invention.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict.

As shown in Figures 1 to 4, the utility model relates to an outdoor vacuum drainage system for domestic sewage that meets the conditions of use in rural areas, and solves the problem that the outdoor gravity drainage system commonly used in rural areas has large buried depth and large pipe diameter, high cost and easy blockage. , easy leakage, cumbersome construction, long construction period, difficult maintenance, poor sanitation conditions, many sewage stations, difficult management and other problems; the existing vacuum pipeline laying method is retained, and the existing outdoor vacuum drainage system pipes are maintained. Small diameter, shallow burial depth, no leakage, no impact on the surrounding environment, convenient and fast construction, short construction period, and long conveying distance. The combination of the interception and septic function of the septic tank realizes the three-phase separation of sewage gas, liquid and solid, prevents large pollutants from entering the pipe network, and effectively avoids the problem of vacuum pipeline blockage; at the same time, the form of the vacuum pump station is changed from the traditional above-ground + underground type. The change to a buried prefabricated pump station can not only meet the relevant regulations on the use of agricultural land, but also shorten and simplify the construction period and steps; in addition, the deodorizing biological filter set at the outlet of the exhaust pipe of the vacuum pump is changed to be set in the vacuum pump station. The new ozone deodorization device, while avoiding secondary pollution, improves the disadvantages of the biological filter, which is greatly affected by the environment, the later maintenance workload is large, it cannot be operated intermittently, and the management operation requires professionals. The operation is simpler and the treatment effect is more stable. , and saves floor space.

The utility model includes a septic collection box 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 deodorizing device, an outdoor equipment The electric cabinet 18 and the control cabinet 17) are composed, and the main process is as follows: the indoor gravity drainage system of the farmer is discharged to the septic collection box 4 outdoors of each household through the gravity outlet pipe 2 for solid-liquid separation (the sludge is separated by the farmer or a special person). Periodic cleaning); the extended top ventilation pipe 1 set in the indoor gravity drainage pipe helps to balance the air pressure in the septic collection box 4, makes the vacuum valve 49 work normally, and can replace the air intake pipe of the existing finished product collection box; If there are too many connections between the septic collection box 4 and the gravity outlet pipe 2 or the connection is not smooth, a third inspection well 3 can be added to connect; When the sewage in the compartment reaches the preset volume, the water pressure of the induction tube activates the pneumatic controller, which opens the vacuum valve 49, and the sewage in the third compartment (suction tank) is under the external atmospheric pressure and the vacuum negative pressure in the tube. Under the joint action, the sewage is quickly drained; a large amount of air enters the vacuum pipeline behind the vacuum valve 49 with the sewage (the air-water ratio is about 3:1 to 15:1), and pushes the sewage to be transported along the pipeline to the buried vacuum tank 12 ; When the water level in the local buried vacuum tank 12 reaches a certain height, the drainage pump located in the buried prefabricated vacuum pump station 14 is automatically turned on to discharge the sewage in the tank to the sewage treatment station or the municipal sewage pipe network, and when it reaches the predetermined low water level Automatically stop the pump; the suction pipe of the vacuum pump located in the buried prefabricated vacuum pump station 14 is connected to the tank top of the buried vacuum tank 12, and the vacuum pump is automatically started and stopped by the pressure sensor on the suction pipe according to the vacuum degree in the tank. Maintain the vacuum pressure in the tank between -0.06MPa and -0.07MPa; the vacuum pump and the drain pump are not turned on at the same time; the ozone generated by the ozone generator 146 is mixed and reacted with the gas discharged by the vacuum pump in the ejector through the rotameter and then discharged to the outside. ;The design calculation of the system is performed according to CECS316:2012;

1. Septic collection box:

The septic collection tank 4 is an important part of the outdoor vacuum drainage system. It is not only a converter of gravity drainage and vacuum drainage, but also a storage container with a certain volume to trap feces and large pieces of sediment; according to the compartment where the vacuum valve is located Whether it is combined with the fecal storage space or not, it is divided into two independent programs.

plan 1

As shown in Figure 2, the upper valve chamber 46 and the lower feces storage space 45 adopt an integrated structure; the lower part of the septic collection box 4 is divided into three compartments, the first compartment, the second compartment and the third compartment, The volume of the three compartments is 50%, 25%, and 25% respectively; the first two compartments have the function of intercepting large pieces of dirt and feces, with a total effective volume of about 1 cubic meter; the third compartment collects relatively clean sewage as A sewage suction tank for sucking sewage by a vacuum pipe; above the sewage suction tank is a valve chamber 46 with independent space, and the valve chamber 46 is equipped with a vacuum valve 49, a controller 48, an upper port of the induction pipe 413, a pressure transmitter interface 412 and a pneumatic valve. The connecting pipeline inside the pipeline; the vacuum sewage suction pipe and the induction pipe 413 extend through the bottom of the valve chamber 47 into the compartment 3 at a distance of 0.05-0.1m from the bottom of the sewage suction tank.

The three partitions in the lower space of the septic collection box 4 are connected with openings, wherein the top of the first partition plate is not less than 0.1m away from the top plate, and the top of the second partition plate is lower than the bottom elevation of the gravity drainage pipe Not less than 0.05m; no less than 2 water-passing holes (dimensions not less than 0.1x0.1m) are set above the first partition plate 0.5m from the bottom of the box. The top of the first compartment is provided with a first inspection well 41 leading to the ground, and the top between the second compartment and the third compartment is provided with a second inspection well 43 leading to the ground; the valve chamber and the manhole cover and well of the inspection well The seat adopts heavy-duty protective manhole cover and well seat; the manhole cover of the valve room should be sealed without ventilation holes; the thickness of the covering soil of the septic collection box 4 is not less than 0.3m; Or PE material, its structural requirements refer to the industry standard "FRP Septic Tank Technical Requirements" (CJ/T409-2012), and the shape is rectangular or oval.

The working principle of the septic collection box 4 is precipitation-decomposition-separation; when the sewage is discharged into the first two grids of the septic collection box 4, the solid matter with a larger specific gravity and the parasite eggs are precipitated to the bottom of the tank, and after fermentation and decomposition The sewage is divided into paste-like floating skin and clarified sewage-liquid-like solid waste. The sewage treated in the second compartment is further harmless; the waste that flows into the third compartment is generally decomposed, and the bacteria in it and parasite eggs have been basically killed, the sewage at this time has been basically harmless; the sewage flowing into the third compartment is temporarily stored in the sewage suction tank, and the change of water pressure (water level) is transmitted to the controller 48 through the induction tube , when the amount of sewage reaches the preset volume, the controller 48 controls the vacuum valve 49 to switch from the closed state to the open state, the sewage in the sewage suction tank is connected to the vacuum pipeline, the sewage is sucked into the vacuum pipeline, and a certain amount of sewage and air is sucked in After that, the liquid level of the sewage suction tank drops, and the vacuum valve 49 is automatically reset; the opening time of the vacuum valve 49 and the flow rate of the gas-liquid mixture can be adjusted by the controller 48; the system adopts the field bus network to monitor the open state of the vacuum valve 49 in the collection box And the high-level status signal of sewage in the sewage suction tank to ensure its normal operation; the sewage after treatment in the septic collection box 4 has completed the process of solid-liquid separation, and the solid waste remains in the first two compartments of the septic collection box. The sewage and waste gas are discharged into the vacuum pipeline and finally discharged into the buried vacuum tank 12 .

The sludge deposited at the bottom of the pool should be removed in time to prevent the sludge and sludge from entering the sewage suction tank and affecting the operation of the vacuum drainage system; the sludge removal period is 3 to 6 months.

The vacuum valve 49 is an important equipment in the vacuum drainage system, and it is the interface valve that isolates the vacuum state and the atmospheric state in the vacuum drainage system; the vacuum valve 49, the supporting controller 48 and the pneumatic pipeline are all purchased finished products; Corrosive negative pressure pneumatic diaphragm vacuum valve or piston angle seat valve; the opening and closing of the valve is controlled by vacuum pneumatic, the sewage level is transmitted by the induction pipe, the action pressure should be -1.25 ~ -2kPa (not more than -0.15KPa), open The time range is 3-10s; the diameter of the valve is 75mm, and the material is ABS; a manual button is set to manually control the vacuum valve 49 to open; a check valve 143 is set on the hose connecting the vacuum port and the controller 48, To prevent moisture gas from entering the controller from the vacuum line.

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

The high liquid level alarm device adopts a pressure transmitter, and the pressure probe extends into the bottom of the sewage suction tank through the pressure transmitter interface at the bottom of the valve chamber for fixed installation; when the liquid level in the collection tank reaches the alarm liquid level, the high liquid level alarm signal to the monitoring system.

The valve chamber of the septic collection tank is equipped with a real-time monitoring system to monitor the opening state of the vacuum valve and the high alarm liquid level, and finally display it in the control cabinet of the vacuum pump station; the side wall of the valve chamber is equipped with an alarm monitoring line interface, a vacuum valve and a liquid level alarm device The monitoring cable is connected with the system monitoring cable laid in the same groove with the vacuum pipeline for unified burial.

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

Scenario 2

As shown in FIG. 3 , the valve chamber 46 and the feces storage space 45 are arranged separately, and the vacuum valve 49 is arranged in an independent valve box;

The vacuum sewage suction pipe and the induction pipe 413 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 septic collection box at a distance of 0.1m from the bottom; the pressure probe of the pressure transmitter is pressed from the top of the third compartment. The probe interface extends into the bottom of the sewage suction tank for fixed installation; the pressure transmitter is installed in the valve box; the valve box and box cover can be made of polyethylene (PE), polyvinyl chloride (PVC) or synthetic materials; the box cover should be sealed without Ventilation holes; when the top cover is set on hardened ground, a heavy-duty protective manhole cover and well seat are added on the plastic top cover of the valve box.

The rest of the scheme is the same as scheme 1.

2. Vacuum drainage pipeline and control valve:

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 pipe is laid in a zigzag or bag shape, and the minimum slope of the vacuum pipe between the bends or U-bends is raised. 0.002 is adopted, and the distance between the lifting bends of the zigzag laying method is between 6 and 100m; the drainage does not need a gravity slope, and the upward transportation is allowed. An inspection pipe leading to the ground is set at the lifting bend or U-shaped pipe; the flow rate of the vacuum pipe is controlled at 3-7m/s.

The pipeline shall be made of high-density polyethylene (HDPE) pipe and homogeneous pipe fittings, and connected by electrofusion; or rigid polyvinyl chloride (PVC-U) pipe and homogeneous pipe fittings shall be used for bonding; the nominal pressure of the pipe should be ≧ 1MPa; refer to the construction and installation of the pipe Industry standard "Technical Regulations for Buried Polyethylene Water Supply Pipeline Engineering" CJJ101 and "Technical Regulations for Buried Rigid Polyvinyl Chloride Water Supply Pipeline Engineering" CECS17.

For vacuum pipelines, 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, an inspection valve shall be provided; the valve adopts a maintenance-free direct-buried gate with corrosion-resistant inner wall, and the nominal pressure of the valve shall be ≧1MPa.

3. Buried vacuum tank:

The pressure in the buried vacuum tank 12 should be maintained within -0.06～-0.07MPa, and the pressure of the tank should not be less than -0.095MPa; the maximum liquid level in the buried vacuum tank 12 should not exceed 1/1 of the effective height of the tank. 2. When the maximum liquid level is exceeded, the liquid level control signal in the tank should automatically turn off the vacuum pump and give an alarm; a pressure type liquid level transmitter is installed on the side wall of the tank, and 4 liquid level control points (drain pump open and Pump stop liquid level, ultra-high and ultra-low alarm liquid level); the vacuum tank is made of carbon steel welding, the inner and outer walls are treated with anti-corrosion (such as epoxy resin coating), the tank body is rectangular or oval, and it is installed horizontally. ;The vacuum tank is provided with inspection holes on the ground; the thickness of the top of the tank should not be less than 0.4m, so as to facilitate ground greening and anti-floating; the design of the vacuum tank should consider the influence of buoyancy and be firmly fixed with the foundation; buried vacuum tank+ The schematic diagram of the buried vacuum pump station is shown in Figure 4.

4. Buried prefabricated vacuum pump station:

The buried prefabricated vacuum pumping station 14 is the core of the outdoor vacuum drainage system, and its location should be close to the sewage treatment station or in the center of the vacuum drainage system; the buried prefabricated vacuum pumping station 14 adopts the buried integrated structure and is equipped with a vacuum pump , sewage pump, submersible sewage pump 141, ozone deodorization device, power distribution cabinet and control cabinet are installed on the ground outside the pump station; the vacuum pump sucks the gas in the vacuum tank into the deodorization device for treatment and discharges, and the drainage pump discharges the sewage to the sewage The process of gas-liquid separation is completed in the vacuum pump station in the treatment station or municipal sewage pipeline. As shown in Figure 4.

1. Vacuum pump

The vacuum pump is a stereotyped product, and two or more rotary vane vacuum pumps with the same operating capacity, low noise and high efficiency should be selected, one of which is a backup pump; the intake pipe of the vacuum pump is connected to the top of the buried vacuum tank, and the vacuum pump out The air pipe is connected to the deodorization device; the air inlet and outlet pipes of the vacuum pump are equipped with control valves and rubber joints; the pressure sensor 1411 is installed on the intake manifold of the vacuum pump group to be interlocked with the vacuum pump control system, and the vacuum pump is automatically started and stopped according to the degree of vacuum; The vacuum gauge can be used by the on-site maintenance personnel to visually check 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.

2. Sewage pump

Two or more of the same type of sewage pump should be selected, low-noise dry installation, centrifugal drainage pump with cutting function, and a spare pump; the sewage pump is connected to the bottom of the buried vacuum tank, and its drainage capacity should meet the The drainage requirements of the vacuum tank; the suction pipe of the sewage pump is provided with a rubber joint and a special gate valve for sewage, and the water outlet pipe is provided with a rubber joint, a pressure gauge, a special check valve 143 for sewage and a gate valve 144; the drainage pump should be able to operate at -0.06MPa～-0.07 It works normally under the negative pressure of MPa; the start and stop of the sewage pump is controlled by the vacuum tank liquid level control device (pressure transmitter) linkage control; the bottom of the drainage pump is provided with a channel steel base 1412 to connect with the ground of the vacuum pump station.

3. Submersible sewage pump

A small amount of leaked water in the vacuum pump station flows into the sump 142, and is discharged by a submersible sewage pump with a flow rate of not less than 0.5L/S and a lift of not less than the lift of the drainage pump; the outlet pipe of the submersible sewage pump 141 is provided with a special sewage check valve 143 and The gate valve 144; the drain pipe of the submersible sewage pump 141 is discharged to the outdoor after confluence with the discharge pipe of the drain pump; the submersible sewage pump 141 is automatically started and stopped by the liquid level control system.

4. Ozone deodorization device

Ozone has extremely strong oxidizing power, 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 the sewage discharged from rural areas are hydrogen sulfide, mercaptans, sulfides and other sulfur-containing compounds, ammonia, amines and other amines, alcohols, fats, aldehydes and other dozens of substances. The most abundant are hydrogen sulfide and ammonia. These odorous gases are decomposed into small molecular substances, water and harmless gases under the action of ozone, so as to achieve the purpose of deodorization.

The ozone deodorizing device is set in the vacuum pump station, mainly including ozone generator 146, rotameter 145, pressure regulating valve and ejector; odor and ozone are respectively transported to the ejector under the action of vacuum pump and ozone generator, and the two In it, a full mixing reaction is carried out, and the odorless substances after the reaction are discharged into the outdoor atmosphere through the pipeline. The outdoor exhaust outlet should be no less than 0.8m from the ground, and the end should be provided with a curved pipe, and the pipe mouth is provided with a 20-30 mesh stainless steel mesh cover to prevent insects; The ozone generator adopts air source and air cooling type equipment, and the amount of ozone generation is controlled at 1 ~ 2g/cubic meter per hour.

5. Pipes and valves

When galvanized steel pipes are used for vacuum pipes and pressure drainage pipes, wire connections are used when DN ≤ 80, and groove connections are used when DN > 80; Bonding; the ozone tube adopts polybutene (PB) tube, welded, or S31603, S31608 thin-walled stainless steel tube, socket welding (when welding, the welding joint should be protected by inert gas).

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 not be less than 1MPa.

6. Power and control requirements

The power supply of the buried prefabricated vacuum pump station adopts dual power sources or double circuits; the drainage pump and the vacuum pump do not work at the same time; the start and stop of the ozone generator and the vacuum pump are controlled to operate; the vacuum pump station should be able to send a fault signal in the event of a power failure; When the water level in the vacuum tank is super high or super low, the drain pump or vacuum pump stops working, the vacuum pump or drain pump runs overtime, and the vacuum level in the vacuum tank is super high or super low, the control system of the pump station should be able to give an alarm; the control system is equipped with equipment Monitoring system and remote monitoring access ports.

The outdoor ground of the buried prefabricated vacuum pump station shall be equipped with rain-proof and dust-proof control cabinets and power distribution cabinets with a protection level of not lower than IP65; Prevent flooding.

7. Other

The buried prefabricated vacuum pumping station adopts factory-integrated prefabrication and is buried on site; the thickness of the top plate of the prefabricated pumping station shall not be less than 0.4m, so as to facilitate the ground green coverage and anti-floating; the design of the pumping station shall consider the influence of buoyancy, and shall Firmly fixed; the manhole 148 of the pump station is not less than 0.5m above the ground to prevent flooding; the manhole is provided with a 0.4m wide stainless steel ladder to facilitate entry and exit of personnel; the whole pump station is made of FRP or PE material that is corrosion-resistant and convenient for construction. The shape is rectangular or square; the top plate of the pump station is provided with an unpowered air cap 1410, and the air cap is not less than 0.7m above the ground.

Other requirements in the vacuum pumping station shall comply with the "Technical Regulations for Outdoor Vacuum Drainage System" (CECS316:2012).

The utility model is an outdoor vacuum drainage system conforming to the conditions of use in rural areas, which can be used to replace the traditional outdoor gravity drainage system and the existing outdoor vacuum drainage system. The compartment where the vacuum valve is located in the utility model can be combined with the feces storage space, or can be set separately; in addition to the above-mentioned preferred shapes and materials, the septic collection box and its accessories are allowed to adopt more shapes such as cylindrical, composite materials , HDPE, stainless steel and more materials; in addition to the above-mentioned preferred diameter, the vacuum valve is allowed to use other diameters such as 60mm and 90mm; in addition to the above-mentioned pneumatic valve, the vacuum valve is allowed to use pneumatic-electric valve and electric valve; vacuum valve In addition to the above-mentioned preferred horizontal tank, the tank can also be a vertical tank; in addition to the above-mentioned preferred shapes and materials, the vacuum tank can also adopt cylindrical and other shapes, and use various materials such as plastic (or composite material). ; In addition to the above-mentioned preferred buried laying, the vacuum tank can also be installed in the vacuum pump station; in addition to the above-mentioned preferred materials and shapes, the prefabricated vacuum pump station can be made of composite materials, reinforced concrete and other more material choices, cylindrical, polygonal, etc. More shapes; the mixing reactor of the ozone deodorizing device, in addition to the above-mentioned preferred ejector, can also use other mixing reaction devices such as reaction tanks and reactors. The above claims shall be protected.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles of the present invention. Improvement and modification should also be regarded as the protection scope of the present invention.

Claims (10)

1. a rural outdoor vacuum drainage system, is characterized in that, comprises: septic collection box, vacuum drainage pipeline and control valve, buried vacuum tank, buried prefabricated vacuum pump station, The farmer's indoor gravity drainage system is discharged to the septic collection box outside each household through the gravity outlet pipe for solid-liquid separation; the farmer's indoor gravity drainage pipe is provided with an extended top ventilation pipe; the septic collection box is passed through the vacuum drainage pipe. And the control valve is connected with the buried vacuum tank, and the buried vacuum tank is connected with the buried prefabricated vacuum pump station. 2 . The rural outdoor vacuum drainage system according to claim 1 , wherein a third inspection well is arranged between the septic collection box and the gravity outlet pipe. 3 . 3. a kind of rural outdoor vacuum drainage system according to claim 1 or 2, is characterized in that, The septic collection box is used for the converter of gravity drainage and vacuum drainage, and is also used for a certain volume of feces and large sediment retention containers; There are two separate schemes: The first type: the septic collection box includes an upper valve chamber and a lower fecal storage space, and the upper valve chamber and the lower feces storage space adopt an integrated structure; wherein, the lower feces storage space is divided into Three grids, the first grid, the second grid and the third grid, and the volume of the three grids is 50%, 25%, 25% respectively; the first two grids, the first grid and the second grid , has the function of intercepting large pieces of dirt and feces; the third compartment collects relatively clean sewage as a sewage suction tank for vacuum pipeline suction sewage; above the sewage suction tank is a space independent valve chamber, and the valve chamber is equipped with a vacuum valve, The controller, the upper port of the induction pipe, the pressure transmitter and the connecting pipeline including the pneumatic pipe; the vacuum sewage suction pipe and the induction pipe extend through the bottom of the valve chamber into the third compartment, 0.05～0.1m from the bottom of the sewage suction tank place; The three partitions in the lower space of the septic collection box are connected with openings. The distance between the top of the first partition board and the top board is not less than 0.1m, and the top of the second partition board is not lower than the bottom elevation of the gravity drainage pipe. less than 0.05m; no less than 2 water-passing holes are set on the first partition plate 0.5m above the bottom of the box; the top of the first compartment is provided with the first inspection well leading to the ground, the second compartment and the third compartment The top between the two inspection wells leading to the ground; the valve chamber and the manhole cover and the well seat of the inspection well are made of heavy-duty protective manhole cover and well seat; the manhole cover of the valve chamber should be sealed without ventilation holes; The thickness of the covering soil is not less than 0.3m; the whole septic collection box is made of glass fiber reinforced plastic or PE material that is corrosion-resistant and convenient for construction; The second type: the septic collection box includes an upper valve box and a lower feces storage space, the valve box and the feces storage space are set separately, 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 storage space at a distance of 0.1m from the bottom; the pressure probe of the pressure transmitter is pressed from the top of the third compartment. The probe interface extends 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 sealed without ventilation holes; when the top cover is installed on the hardened ground, a heavy-duty protection is added on the plastic top cover of the valve box Manhole covers and well bases; Among them, the lower part of the feces storage space is divided into three compartments, the first compartment, the second compartment and the third compartment, and the volume of the three compartments is 50%, 25%, 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 pipe suction sewage; The three partitions in the lower space of the septic collection box are connected with openings. The distance between the top of the first partition board and the top board is not less than 0.1m, and the top of the second partition board is not lower than the bottom elevation of the gravity drainage pipe. less than 0.05m; no less than 2 water-passing holes are set on the first partition plate 0.5m above the bottom of the box; the top of the first compartment is provided with the first inspection well leading to the ground, the second compartment and the third compartment The top of the inspection well is set up with a second inspection well leading to the ground; the well cover and well seat of the inspection well shall be heavy-duty protective well cover and well seat; the thickness of the covering soil of the septic collection box shall not be less than 0.3m; the whole septic collection box shall be made of corrosion-resistant , FRP or PE material with convenient construction. 4. a kind of rural outdoor vacuum drainage system according to claim 1 or 2, is characterized in that, The pipeline of the vacuum drainage system includes a vacuum exhaust pipe, a vacuum drainage branch pipe, a vacuum drainage main pipe and a first inspection pipe; wherein, the vacuum pipeline adopts a zigzag or bag-shaped laying method, and the vacuum pipeline between the lifting bends or U-shaped bends is installed. The minimum slope is 0.002, and the spacing between the lifting bends of the zigzag laying method is between 6 and 100m; the drainage does not need a gravity gradient, and the upward transportation is allowed to be conveyed along the slope. When the pipeline continuously climbs the slope, a U-shaped bend is set in front of the 45° ascending section; Each lifting bend or U-shaped pipe is provided with an inspection pipe leading to the ground; the flow rate of the vacuum pipe is controlled at 3-7m/s. 5. A rural outdoor vacuum drainage system according to claim 4, characterized in that, The vacuum pipeline adopts high-density polyethylene pipe and homogeneous pipe fittings, and is connected by electrofusion; or adopts rigid polyvinyl chloride pipe and homogeneous pipe fittings, and is bonded; when the branch pipe is connected to the main pipe and the length of the straight pipe is greater than 400m, A maintenance valve should be provided. 6. A kind of rural outdoor vacuum drainage system according to claim 1 or 2, is characterized in that, The pressure in the buried vacuum tank should be maintained between -0.06～-0.07MPa, and the pressure of the tank should not be less than -0.095MPa; the maximum liquid level in the buried vacuum tank should not exceed 1/1 of the effective height of the tank. 2. 7. A rural outdoor vacuum drainage system according to claim 1 or 2, characterized in that the buried prefabricated vacuum pump station is arranged in a position close to a sewage treatment station or at the center of the vacuum drainage system; It has an integrated structure with vacuum pump, drainage pump, submersible sewage pump and ozone deodorization device. The ground outside the pump station is equipped with power distribution cabinet and control cabinet. The vacuum pump sucks the gas in the buried vacuum tank into the deodorization device. After treatment, the drainage pump discharges the sewage to the sewage treatment station or the municipal sewage pipeline, and completes the process of gas-liquid separation in the vacuum pump station. 8. A rural outdoor vacuum drainage system according to claim 7, wherein the vacuum pumps are two or more rotary vane vacuum pumps with the same operation capability, low noise and high efficiency, and one of them is a standby 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 ozone deodorizing device. 9. A rural outdoor vacuum drainage system according to claim 7, characterized in that, two or more drainage pumps are of the same model, low-noise dry installation, and a centrifugal drainage pump with a cutting function is provided with one Standby pump; 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. 10 . The rural outdoor vacuum drainage system according to claim 7 , wherein a sump is set in the buried prefabricated vacuum pumping station, and the sump is used to collect a small amount of leaking water from the pipeline. 10 . A submersible sewage pump is installed in the pit, and the outlet pipe of the submersible sewage pump is provided with a special check valve and gate valve for sewage;

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