CN109368789B - Rural domestic sewage treatment system - Google Patents

Abstract

The invention discloses a rural domestic sewage treatment system, which comprises a closed septic tank and a sealed biochemical tank, wherein a water inlet pipe is communicated between the lower end of the biochemical tank and an outlet of the septic tank, an exhaust port is arranged at the upper end of the water inlet pipe, a grating and an aeration disc are arranged at the bottom of the biochemical tank, a suspended filler ball is put in the biochemical tank, a water outlet pipe is connected to the middle part of the biochemical tank, an access hole and two interfaces are arranged at the top of the biochemical tank, one interface is used for penetrating a gas pipe communicated with the aeration disc, the other interface is provided with a gas pressure pipe, and an access cover is fixed on the access hole in a sealing manner; the gas source is characterized by further comprising a gas source, an outlet of the gas source is connected with the gas conveying pipe through a connecting pipe and a three-way valve, the rest interfaces of the three-way valve are connected to a first three-way joint, and the other two interfaces of the first three-way joint are respectively connected with a gas pressure pipe and a two-way valve. Thereby providing a rural domestic sewage treatment system with simple structure and low cost, and having the characteristics of low investment, high profit and being beneficial to actual popularization in rural areas.

Description

Rural domestic sewage treatment system

Technical Field

The invention belongs to the technical field of sewage treatment, and particularly relates to a rural domestic sewage treatment system.

Background

At present, rural villages and residents are scattered, sewage discharge has the characteristics of wide and scattered discharge range, and domestic sewage of rural residents cannot be treated in a large-scale centralized manner. Along with more and more attention paid to environmental protection, rural domestic sewage is gradually upgraded from direct discharge to discharge after being treated by a closed septic tank, the upper end of the septic tank is provided with an inlet for liquid inlet and an outlet for liquid discharge and exhaust, the sewage is directly discharged after anaerobic fermentation in the septic tank, and the water quality after treatment can not reach the first-level A standard of pollutant discharge standard of urban sewage treatment plants. The sewage of the septic tank which does not reach the standard is gathered in village ditches, fish ponds and lakes, exceeds the bearing capacity of natural water, destroys the water environment and threatens the drinking water safety of vast rural areas. Therefore, it is an urgent need to provide an effective rural domestic sewage treatment system.

The existing equipment for treating dispersed domestic sewage has a plurality of brands, the adopted process is largely the same and different, and the process typically comprises the working procedures of collection, precipitation separation, anaerobism, aerobism, secondary precipitation, disinfection and the like.

Patent document CN10231272A discloses an integrated decentralized domestic sewage treatment device, which is characterized in that a main shell is internally divided into four parts, namely a pretreatment area, an anaerobic area, an aerobic area and a precipitation disinfection area, a partition plate is arranged between the anaerobic area and the aerobic area, a pneumatic water pump is arranged on one side of the partition plate close to the anaerobic area, and the pneumatic water pump conveys water in the anaerobic area to the aerobic area by means of the power of a pressure air source, so that the aerobic area is always kept at a constant water level and a basically stable conveying flow. Although the device has stable operation and high treatment efficiency, the integral equipment has a complex internal structure, the water pump is arranged to increase the cost, the equipment cost is high, the failure rate is high, the use and the maintenance are not facilitated, and the device cannot be practically popularized in vast rural areas.

Patent document CN103183453A discloses a "excrement sewage biochemical treatment device", including the ozone jar, hold the pond temporarily, biochemical jar and water purification case, biochemical jar is including a jar body, water supply connector, connect water supply connector's booster pump, the aerator, connect the air compressor machine of aerator and be used for discharging the blowoff valve of jar interior precipitate, the booster pump will be washed the biochemical jar of high concentration excrement sewage that the lavatory produced by water supply connector pump income, the biochemical water that goes through the processing in the irritating gets into through the zigzag overflow weir of upper portion and holds the pond temporarily, hold the pond water level in temporarily and go into the ozone jar through the pump after reaching the take the altitude, the ozone jar is connected with the water purification case. The device is additionally provided with the temporary storage tank and the ozone tank for improving the treatment effect of the excrement and sewage, and the treated water can be directly used for flushing a toilet. But the whole equipment still has the problems of complex structure, high equipment cost and inconvenience for use and maintenance, and the water inlet of the biochemical tank and the water outlet of the temporary storage tank both adopt pump bodies, so that the cost and the failure rate are increased, and the actual popularization in vast rural areas is not facilitated.

Patent document CN104556549A discloses a "domestic sewage treatment device and method", which comprises an anaerobic treatment unit, an aeration unit, a clear water containing unit, an air pressure providing unit, a vacuum generation unit and an air-water separation unit, wherein the anaerobic treatment unit is communicated with a water inlet of the aeration unit; the air pressure providing unit is used for providing power for discharging liquid in the anaerobic treatment unit into the aeration unit, providing power for discharging liquid in the gas-water separation unit into the clear water containing unit and providing air for the aeration unit; the vacuum generating unit is used for pumping the liquid in the aeration unit to the gas-water separation unit. The universal air pressure providing unit is arranged in this way, so that the cost and the maintenance difficulty are reduced, but the aeration unit still needs to be additionally provided with a vacuum generating unit for outputting liquid, and the equipment cost is still higher.

Patent document CN106966546A discloses a "rural domestic sewage treatment device", which comprises a filter tank, an anaerobic tank, an aeration tank and a culture tank, rural domestic sewage enters the filter tank from a water inlet above the filter tank, after primary filtration, the rural domestic sewage enters the anaerobic tank through a filter plate at the bottom of the filter tank, sewage after anaerobic treatment in the anaerobic tank enters the aeration tank through a water suction pump and a connecting pipe, sewage after aeration treatment is transferred to the culture tank by a water suction machine to culture plants, then water in the culture tank is pumped out by a water outlet pump, the pumped water is detected to reach the discharge standard of secondary domestic sewage and can be discharged, otherwise, the backflow is retreated. The device also needs to be additionally provided with a water suction pump to realize the liquid transfer between the anaerobic tank and the aeration tank and the discharge of sewage in the aeration tank, and has high equipment cost and high use and maintenance cost.

In conclusion, the research and development of the existing rural sewage treatment equipment mainly aims at improving the sewage treatment efficiency, a plurality of tanks or tanks are arranged, or a plurality of areas are arranged in the tanks, the tanks or tanks comprise aerobic treatment units needing aeration and units with functions of sedimentation, anaerobism, liquid storage and the like, liquid transfer among the units is mainly realized by utilizing overflow and a water pump, and liquid outlet of the aeration units is realized by utilizing the water pump. Therefore, the electromechanical cost of the equipment is increased, the maintenance cost of the water suction pump is increased, the energy consumption of the whole equipment is high, and the wide popularization in rural areas is not facilitated. In fact, through the improvement of environmental awareness in the past years, most rural residents are provided with septic tanks at home, and if a sewage treatment system can be provided at the lowest possible cost on the basis of the existing preparation, the septic tank can be more suitable for the basic situation of rural domestic sewage treatment, and is more suitable for popularization and application.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a rural domestic sewage treatment system with simple structure and low cost.

The technical scheme for solving the technical problem of the invention is as follows: a rural domestic sewage treatment system comprises a closed septic tank, wherein the upper end of the septic tank is provided with an inlet for liquid inlet and an outlet for liquid discharge and exhaust, the system further comprises a sealed biochemical tank, a water inlet pipe is communicated between the lower end of the biochemical tank and the outlet of the septic tank, the upper end of the water inlet pipe is provided with an exhaust port, a grating and an aeration disc are mounted at the inner bottom of the biochemical tank, a communication port between the water inlet pipe and the biochemical tank is positioned below the grating, and the aeration disc is also positioned below the grating; the biochemical tank is internally provided with a suspended filler ball positioned above the grating, the middle part of the biochemical tank is provided with a water outlet, the water outlet is connected with a water outlet pipe, the outlet of the water outlet pipe is lower than the outlet of the septic tank, the top of the biochemical tank is provided with an access hole and two interfaces, one interface is used for being penetrated and installed with a gas pipe communicated with the aeration disc, the other interface is provided with a gas pressure pipe, and the access hole is hermetically and fixedly provided with an access cover; still include the air supply, the air supply export is connected with the gas-supply pipe through connecting pipe and three-way valve, the remaining interface of three-way valve is connected to first three way connection, pneumatic tube and a two-way valve are connected respectively to two other interfaces of first three way connection.

By adopting the structure, the device is provided with the sealed biochemical tank communicated with the existing septic tank, and is also provided with the air source connected with the air delivery pipe and the air pressure pipe of the biochemical tank, the biochemical tank is internally provided with the aeration disc, the grating and the suspension packing ball, and the water outlet of the biochemical tank is connected with the water outlet pipe, thereby providing the rural domestic sewage treatment system with simple structure and low cost. In actual use, rural domestic sewage enters the septic tank from the septic tank inlet, sedimentation and anaerobic treatment are carried out in the septic tank, and gas generated in the septic tank is discharged through the gas outlet at the upper end of the water inlet pipe; when the liquid level in the septic tank reaches the height of the outlet, the liquid after anaerobic treatment in the septic tank enters the biochemical tank through the water inlet pipe; when the liquid in the biochemical tank is not full or does not reach the set liquid discharge level, controlling the air source to only supply air to the aeration disc, carrying out full aerobic treatment on the sewage in the biochemical tank, and simultaneously opening the two-way valve to ensure that the air pressure in the biochemical tank is balanced with the outside; when the liquid in the biochemical tank is full or reaches a set liquid discharge level, the two-way valve is closed, the air source is controlled to supply air only to the air pressure pipe, the liquid in the biochemical tank is discharged through the water outlet pipe under the action of air pressure to realize liquid discharge until the liquid level in the biochemical tank drops below the water outlet, then the two-way valve is opened again, the air source is controlled to supply air only to the aeration disc, and the biochemical tank is subjected to aerobic treatment; the rural domestic sewage treatment system mainly has the following advantages:

firstly, the existing septic tank is fully utilized, and only a biochemical tank needs to be additionally arranged, so that the system is simple in overall structure, small in occupied space and low in construction cost; even if a septic tank is not used in the prior art, the adding cost of the whole system is very low, which is beneficial to the practical popularization and application in vast rural areas;

a sealed biochemical tank is adopted, liquid in the biochemical tank is discharged in an air pressure mode, and compared with a pump body which is conventionally arranged in the prior art, the pump body is not required to be buried in the tank body, the electromechanical arrangement is simpler, the failure rate is lower, and the maintenance cost is lower;

the air source adopted by the air pressure drainage of the biochemical tank and the aeration disc share the same air source, only the pipeline output by the air source of the existing aeration disc needs to be modified, and only one three-way valve and one two-way valve are added on the electromechanical equipment for modifying the pipeline, so that the equipment cost is further reduced, and the actual popularization in rural areas is facilitated;

the liquid inlet of the biochemical tank adopts a septic tank overflow mode, and a liquid transfer device is not additionally arranged, so that on one hand, the full anaerobic treatment of sewage in the septic tank is facilitated, on the other hand, the whole equipment is simpler, the manufacturing cost is lower, and the actual situation of rural sewage treatment is better met;

and fifthly, through inspection, the liquid discharged by the biochemical tank completely meets the first-level A standard of pollutant discharge standard of urban sewage treatment plants, so that the sewage can be subjected to anaerobic treatment, aerobic treatment, precipitation and discharge by using a simple system, the investment of the whole system is low, the income is high, and the practical popularization is facilitated.

The biochemical tank comprises a circular barrel part, a conical part and a circular tube part from bottom to top, wherein the upper end of the circular barrel part is integrally connected with the lower end of the conical part, the upper end of the conical part is integrally connected with the lower end of the circular tube part, a flange is fixed at the upper end of the circular tube part, a flange-shaped access cover is connected to the flange through bolts, and a sealing ring is arranged between the access cover and the flange in a cushioning mode. Design biochemical jar like this, cask portion can ensure that biochemical jar has sufficient capacity, and cone portion and pipe portion are used for narrowing the upper end bore, avoid setting up great uncovered on the jar body, adopt flange and sealing washer to be connected between pipe portion and the access cover, make the access cover not only fixed stable, sealed reliable, installation easy operation moreover.

Preferably, the inner hole diameter of the biochemical tank circular pipe section is d equal to 0.4 m. Also the size of the access hole is convenient for the aeration disc and other components in the biochemical tank to be overhauled.

The water outlet pipe comprises an upper horizontal section, a lower horizontal section and a vertical section connected between the two horizontal sections, and the horizontal section close to the water outlet pipe is lower than the lower end of the circular pipe section. The water outlet pipe has a simple structure, and two horizontal sections with height difference are arranged, so that the water outlet of the biochemical tank is ensured.

And the height difference H between the upper edge of the water outlet and the lower edge of the water outlet pipe is 0.4 m. That is, the maximum air pressure which the air source needs to provide for the biochemical tank is adapted to the hydraulic pressure of the liquid with the height of 0.4m, and the air pressure extreme value is calculated to be most suitable, so that the increase of the production cost of the biochemical tank caused by the overlarge pressure of the air source which needs to be provided can be avoided.

The inlet tube includes two upper and lower horizontal segments and connects the vertical section between two horizontal segments to the horizontal segment of inlet tube top passes through second three way connection and vertical section intercommunication, second three way connection's surplus interface constitutes promptly or is provided with the gas vent. The water inlet pipe has simple structure and convenient installation.

Preferably, the suspension filler ball occupies one third to one half of the space in the biochemical tank.

The outer diameter of the suspension filler ball is larger than the caliber of the water outlet of the biochemical tank, so that the suspension filler ball can be effectively prevented from being discharged out of the biochemical tank from the water outlet pipe.

And the outlet of the two-way valve is connected with a silencer and can be used for carrying out silencing and noise reduction treatment on the exhaust gas.

Preferably, the device further comprises a control unit, and the gas source, the three-way valve and the two-way valve are all electrically connected with the control unit.

Has the advantages that: the rural domestic sewage treatment system has the characteristics of low investment, high profit and more contribution to actual rural popularization, and has a simple structure and low cost.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Reference numerals: the septic tank comprises a septic tank 1, an inlet 1a, an overflow pipe 1b, a partition plate 1c, an outlet 1d, a biochemical tank 2, a water outlet 2a, a water inlet pipe 3, an exhaust port 4, a second three-way joint 5, an aeration disc 6, a grid 7, a suspension filler ball 8, a water outlet pipe 9, a gas pipe 10, a gas source 11, a three-way valve 12, an access cover 13, a sealing ring 14, a flange plate 15, a first three-way joint 16, a two-way valve 17 and a gas pressure pipe 18.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1, the present embodiment provides a rural domestic sewage treatment system, which comprises a closed septic tank 1, wherein an inlet 1a for inlet liquid and an outlet 1d for drainage and exhaust gas are provided at the upper end of the septic tank 1, and the septic tank 1 may be an existing septic tank on the market, or may be redesigned, which is not limited herein. The present embodiment preferably employs an existing three-stage septic tank 1, which septic tank 1 includes three treatment stages of an initial stage, a middle stage and a final stage from one end near the inlet 1 a. Baffle plates 1c are arranged between the initial section and the middle section and between the middle section and the final section, the upper end of each baffle plate 1c is connected with the upper end of an overflow pipe 1b, and the lower end of the overflow pipe 1b extends into the middle lower part of the last processing section.

As shown in fig. 1, the present embodiment further includes a sealed biochemical tank 2, the biochemical tank 2 includes, from bottom to top, a cylindrical portion, a conical portion and a circular tube portion, the upper end of the cylindrical portion is integrally connected with the lower end of the conical portion, and the upper end of the conical portion is integrally connected with the lower end of the circular tube portion. The diameter of an inner hole of the round pipe section of the biochemical tank 2 is 0.4m, the round pipe section forms an access hole, a flange plate 15 is fixed at the upper end of the round pipe section, a flange-shaped access cover 13 is connected onto the flange plate 15 through bolts, a sealing ring 14 is arranged between the access cover 13 and the flange plate 15 in a padding mode, and the access cover 13 is fixed on the access hole in a sealing mode.

As shown in fig. 1, a water inlet pipe 3 is communicated between the lower end of the biochemical tank 2 and an outlet 1d of the septic tank 1, and an exhaust port 4 is arranged at the upper end of the water inlet pipe 3. The inlet tube 3 includes two horizontal segments from top to bottom and connects the vertical section between two horizontal segments to the horizontal segment of inlet tube 3 top passes through second three way connection 5 and vertical section intercommunication, the remaining interface of second three way connection 5 constitutes or is provided with gas vent 4 promptly.

As shown in FIG. 1, a grating 7 and at least one aeration plate 6 are installed at the inner bottom of the biochemical tank 2, the communication port between the water inlet pipe 3 and the biochemical tank 2 is located below the grating 7, and the aeration plate 6 is also located below the grating 7. The middle part of the biochemical tank 2 is provided with a water outlet 2a, the water outlet 2a is connected with a water outlet pipe 9, and the outlet of the water outlet pipe 9 is lower than the outlet 1d of the septic tank 1 and lower than the lower end of the circular pipe section of the biochemical tank 2. And the height difference H between the upper edge of the water outlet 2a and the lower edge of the outlet of the water outlet pipe 9 is 0.4 m. In this embodiment, it is preferable that the water outlet pipe 9 includes an upper horizontal section and a lower horizontal section, and a vertical section connected between the two horizontal sections, and the horizontal section on the upper side of the water outlet pipe 9 is lower than the lower end of the circular pipe section.

As shown in FIG. 1, a suspension filler ball 8 positioned above a grid 7 is put in the biochemical tank 2, and the suspension filler ball 8 occupies one third to one half of the space in the biochemical tank 2. The outer diameter of the suspension filler ball 8 is larger than the caliber of the water outlet 2a of the biochemical tank 2.

As shown in fig. 1, two connectors are further arranged at the top of the biochemical tank 2, the two connectors are located on the conical section, one connector is used for being provided with an air pipe 10 communicated with the aeration disc 6 in a penetrating mode, and the other connector is provided with an air pressure pipe 18. The gas supply device further comprises a gas source 11, an outlet of the gas source 11 is connected with the gas conveying pipe 10 through a connecting pipe and a three-way valve 12, and the rest of an interface of the three-way valve 12 is connected to a first three-way joint 16. The other two ports of the first three-way joint 16 are respectively connected with a pneumatic tube 18 and a two-way valve 17, and a silencer (not shown in the figure) can be connected to the outlet of the two-way valve 17. The present embodiment further includes a control unit, and the air source 11, the three-way valve 12 and the two-way valve 17 are electrically connected to the control unit.

In this embodiment, a liquid level meter (not shown in the drawings) is further installed on the biochemical tank 2 for monitoring the liquid level in the biochemical tank 2. In actual use, the combination of liquid level monitoring in the biochemical tank 2 and the water consumption time of rural residents can be adopted to control whether the biochemical tank 2 carries out aerobic treatment or liquid drainage.

The embodiment also provides a rural domestic sewage treatment method based on the rural domestic sewage treatment system, which comprises the following steps: when the liquid level meter monitors that the liquid level in the biochemical tank 2 is higher than a set value, or after a set time point at night and residents do not discharge sewage to the septic tank 1 any more, the control system controls the three-way valve 12 to close gas supply from the gas source 11 to the gas pipe 10, starts gas supply from the gas source 11 to the first three-way joint 16 through the three-way valve 12, and controls the two-way valve 17 to close, at the moment, the biochemical tank 2 stops aerobic treatment, and under the action of gas supply from the gas source 11, the pressure in the biochemical tank 2 is increased to begin to discharge liquid from the water outlet pipe 9 until the liquid level in the biochemical tank 2 is lower than the water; when the liquid level in the biochemical tank 2 is lower than the water outlet 2a, or after a set time in the morning, the residents start to discharge sewage to the septic tank 1 after starting a day, the control system controls the three-way valve 12 to open the air source 11 to supply air to the air delivery pipe 10, closes the air source 11 to supply air to the first three-way joint 16 through the three-way valve 12, controls the two-way valve 17 to open, stops discharging the liquid in the biochemical tank 2 at the moment, supplies air to the aeration disc 6 through the air delivery pipe 10 from the air source 11, carries out aerobic treatment on the biochemical tank 2, and the two-way valve 17, the first three-way joint 16 and the air pressure pipe 18 are used for ensuring that.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims (9)

1. The utility model provides a rural domestic sewage treatment system, includes confined septic tank the upper end of septic tank is equipped with the import that is used for the feed liquor and is used for flowing back and carminative export, its characterized in that: the device is characterized by also comprising a sealed biochemical tank, wherein a water inlet pipe is communicated between the lower end of the biochemical tank and an outlet of the septic tank, an exhaust port is arranged at the upper end of the water inlet pipe, a grating and an aeration disc are arranged at the inner bottom of the biochemical tank, a communication port between the water inlet pipe and the biochemical tank is positioned below the grating, and the aeration disc is also positioned below the grating;

the biochemical tank is internally provided with a suspended filler ball positioned above the grating, the middle part of the biochemical tank is provided with a water outlet, the water outlet is connected with a water outlet pipe, the outlet of the water outlet pipe is lower than the outlet of the septic tank, the top of the biochemical tank is provided with an access hole and two interfaces, one interface is used for being penetrated and installed with a gas pipe communicated with the aeration disc, the other interface is provided with a gas pressure pipe, and the access hole is hermetically and fixedly provided with an access cover;

the gas source outlet is connected with the gas pipe through a connecting pipe and a three-way valve, the rest interfaces of the three-way valve are connected to a first three-way joint, and the other two interfaces of the first three-way joint are respectively connected with a gas pressure pipe and a two-way valve;

the biochemical tank comprises a circular barrel part, a conical part and a circular tube part from bottom to top, wherein the upper end of the circular barrel part is integrally connected with the lower end of the conical part, the upper end of the conical part is integrally connected with the lower end of the circular tube part, a flange is fixed at the upper end of the circular tube part, a flange-shaped access cover is connected to the flange through bolts, and a sealing ring is arranged between the access cover and the flange in a cushioning mode.

2. The rural domestic sewage treatment system of claim 1, wherein: the aperture of the inner hole of the circular pipe section of the biochemical tank is d 0.4 m.

3. The rural domestic sewage treatment system of claim 2, wherein: the water outlet pipe comprises an upper horizontal section, a lower horizontal section and a vertical section connected between the two horizontal sections, and the horizontal section close to the water outlet pipe is lower than the lower end of the circular pipe section.

4. The rural domestic sewage treatment system of claim 1, 2 or 3, wherein: and the height difference H between the upper edge of the water outlet and the lower edge of the water outlet pipe is 0.4 m.

5. The rural domestic sewage treatment system of claim 1, wherein: the inlet tube includes two upper and lower horizontal segments and connects the vertical section between two horizontal segments to the horizontal segment of inlet tube top passes through second three way connection and vertical section intercommunication, second three way connection's surplus interface constitutes promptly or is provided with the gas vent.

6. The rural domestic sewage treatment system of claim 1, wherein: the suspension filler ball occupies one third to one half of the space in the biochemical tank.

7. The rural domestic sewage treatment system of claim 6, wherein: the outer diameter of the suspension filler ball is larger than the caliber of the water outlet of the biochemical tank.

8. The rural domestic sewage treatment system of claim 1, wherein: and a silencer is connected to the outlet of the two-way valve.

9. The rural domestic sewage treatment system of claim 1, wherein: the gas source, the three-way valve and the two-way valve are all electrically connected with the control unit.

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