CN218620496U - Rural domestic sewage treatment system - Google Patents

Abstract

The utility model belongs to the technical field of water treatment, concretely relates to rural domestic sewage treatment system. The utility model provides a rural domestic sewage treatment system, this system includes septic tank, reaction tank, sedimentation tank, and the reaction tank includes anaerobic reaction pond, oxygen deficiency pond, aerobic reaction pond, and the anaerobic reaction pond includes UASB reactor, anaerobism biological filter, and the aerobic reaction pond is good oxygen contact oxidation reactor, and the septic tank is used for collecting and preliminary treatment contains the target sewage of mud, and reaction tank and sedimentation tank are used for retreating the target sewage that contains mud after the septic tank handles. This application makes this system sewage treatment efficient high and stable, is convenient for maintain.

Description

Rural domestic sewage treatment system

Technical Field

The utility model belongs to the technical field of water treatment, concretely relates to rural domestic sewage treatment system.

Background

With the promotion of new urbanization and beautiful country construction, the rural sewage treatment industry drives into a motorway, and compared with the rural domestic sewage, the rural domestic sewage has the advantages that although the main pollutants have similar components in water quality, namely COD, BOD5, SS, NH3-N, TN, TP and the like, the concentration of the main pollutants in the rural domestic sewage is lower, and more impurities are contained; in the aspect of sewage water amount, the rural domestic sewage discharge amount is large, the discharge amount changes greatly along with time, the discharge amount is larger in the morning and evening than in the daytime, and the discharge amount at night is small and even possibly zero.

At present, the treatment of rural domestic sewage in China has more problems, such as: firstly, natural villages in China are distributed dispersedly, the amount of domestic sewage in rural areas is small and unstable, the number of sewage collection nodes is large, and the sewage is difficult to collect; the concentration of suspended matters is high and is limited by local social and economic conditions; secondly, the national small-scale sewage treatment does not have a drainage channel and a sewage treatment system, sewage is discharged at will, serious river water and environmental pollution is caused, and if a centralized treatment scheme is adopted for the generated sewage, the investment on a pipe network is very large, and the construction is also very difficult; thirdly, the traditional anaerobic-anoxic-aerobic process integrated sewage treatment equipment has more power consumption parts, high system operation energy consumption and high maintenance difficulty, and particularly, when the equipment is applied to the unmanned management process of rural sewage treatment, the effluent can not stably reach the first-level A discharge standard.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a rural domestic sewage treatment system for this system sewage treatment is efficient and stable, is convenient for maintain.

A rural domestic sewage treatment system comprises a septic tank, a reaction tank and a sedimentation tank, wherein the reaction tank comprises an anaerobic reaction tank, an anoxic tank and an aerobic reaction tank,

the anaerobic reaction tank comprises a UASB reactor and an anaerobic biological filter,

the aerobic reaction tank is an aerobic contact oxidation reactor,

the septic tank is used for collecting and primarily treating target sewage containing sludge, and the reaction tank and the sedimentation tank are used for retreating the target sewage containing sludge after being treated by the septic tank.

By adopting the technical scheme, the septic tank is equipment for treating excrement and filtering and precipitating, not only can play a role of collecting rural sewage, but also can remove partial organic matters through the metabolism of microorganisms; the UASB reactor can improve the anaerobic treatment efficiency and promote the anaerobic sludge granulation, and the anaerobic biofilter can remove soluble organic matters in target sewage and convert macromolecular substances into micromolecular substances for retreatment; the anoxic tank can remove total nitrogen through denitrification, the aerobic contact oxidation processor can perform aerobic biochemical treatment on the target sewage to degrade carbon-containing organic matters in the target sewage, and the sedimentation tank is mainly used for advanced treatment.

Preferably, the septic tank is connected with the UASB reactor through a first pipeline, a first pump is mounted on the first pipeline, and the first pipeline is used for circulation of target sewage;

by adopting the technical scheme, the condensate is decomposed at the bottom of the septic tank, and the hydrate on the upper layer enters the pipeline to flow away, so that the pipeline is prevented from being blocked, and sufficient time is provided for the condensate (garbage such as excrement) to be hydrolyzed.

There is the baffle in the septic tank, there is the opening on the baffle, the baffle is used for separate different treatment cavity rooms in the septic tank, the opening is used for the circulation of target sewage, there is the passageway one on the septic tank, outside cleaning device is cleared up in the passageway one connection the septic tank.

Preferably, there is a valve between the pump I and the UASB reactor, and the UASB reactor is provided with a filler, and the filler is used for accelerating and increasing the processing speed and the processing strength of the UASB reactor respectively.

By adopting the technical scheme, the UASB reactor is filled with the filler modified by nano magnesium oxide in a certain proportion, so that the starting time of the UASB reactor can be shortened, and the granulation of anaerobic sludge is promoted;

preferably, the UASB reactor passes through the second interface of connecting the solenoid valve of pipeline one, the interface two of solenoid valve is divided the pipe one and is connected the anaerobism filtering pond, the interface three of solenoid valve is connected through being divided pipe two the oxygen deficiency pond, the solenoid valve is arranged in the target sewage inflow in the control duct two divide pipe one or divide pipe two.

Preferably, an anaerobic gas stirring system is arranged in the anaerobic biological filter tank, an anoxic gas stirring system is arranged in the anoxic tank, and the anaerobic gas stirring system and the anoxic gas stirring system are used for stirring target sewage.

Preferably, the anaerobic biological filter is connected with the anoxic tank through a third pipeline, and a second valve is arranged on the third pipeline.

Preferably, the anoxic tank is connected with the aerobic contact oxidation reactor through a fourth pipeline, the fourth pipeline is provided with a third valve, an aeration system is arranged in the aerobic contact oxidation reactor, and the aeration system is used for accelerating the treatment speed of the target sewage.

Preferably, the aerobic contact oxidation reactor is further connected with an anoxic tank through a pipeline five, a mixed liquor backflow stripping system and a valve four are arranged on the pipeline five, and the mixed liquor backflow stripping system is used for enabling target sewage to flow back into the anoxic tank from the aerobic contact oxidation reactor;

the anoxic tank is further connected with the sedimentation tank through a sixth pipeline, and a fifth valve is arranged on the sixth pipeline.

Preferably, the sedimentation tank is connected with the anaerobic biofilter through a seventh pipeline, a sludge backflow and gas-stripping system is arranged on the seventh pipeline, and the sludge backflow and gas-stripping system is used for reflowing sludge at the bottom of the sedimentation tank into the anaerobic biofilter;

and a back washing system is arranged in the sedimentation tank and is used for cleaning the sedimentation tank.

By adopting the technical scheme, the sedimentation tank is mainly used for advanced treatment. The back washing is automatically carried out under the action of the back washing system, so that the impurity is not accumulated in the area, and the benign operation of the system is maintained.

Preferably, the septic tank is provided with a water inlet for the circulation of the target sewage, the sedimentation tank is provided with a water outlet for the circulation of the target sewage, and the water outlet is connected with an external sewage discharge system.

The utility model has the advantages that:

first, the system of this application includes septic tank, UASB reactor, anaerobism biological filter, oxygen deficiency pond, good oxygen contact oxidation reactor, sedimentation tank, specifically is: the septic tank is equipment for treating excrement and filtering and precipitating, not only can play a role in collecting rural sewage, but also can remove part of organic matters through the metabolism of microorganisms; the UASB reactor can improve the anaerobic treatment efficiency and promote the anaerobic sludge granulation, and the anaerobic biofilter can remove soluble organic matters in target sewage and convert macromolecular substances into micromolecular substances for retreatment; the anoxic tank can remove total nitrogen through denitrification, the aerobic contact oxidation processor can perform aerobic biochemical treatment on the target sewage to degrade carbon-containing organic matters in the target sewage, and the sedimentation tank is mainly used for deep treatment, so that the system sewage treatment efficiency is high and stable;

secondly, the system comprises an aeration system arranged in the aerobic contact oxidation reactor, the aeration system can enable air to be fully contacted with target sewage, so that the dissolved oxygen content in the target sewage is improved, aerobic microorganisms in the aerobic contact oxidation reactor can rapidly propagate and treat the target sewage, and the sewage treatment efficiency of the system is high and stable;

thirdly, the anaerobic gas stirring system and the anoxic gas stirring system are included, the anaerobic gas stirring system is respectively used for accelerating and increasing the contact speed and the contact area of anaerobic microorganisms suspended between filter material gaps in the anaerobic biological filter tank and target sewage, and the anoxic gas stirring system is respectively used for accelerating and increasing the contact speed and the contact area of denitrifying bacteria and the target sewage, so that the sewage treatment efficiency of the system is high and stable;

fourthly, the system is provided with a backwashing system, the sedimentation tank is automatically backwashed under the action of the backwashing system, so that impurities are not accumulated in an area, the benign operation of the system is maintained, and the septic tank is provided with a first channel which is connected with an external cleaning device to clean the septic tank, so that the system is convenient to maintain;

synthesize above-mentioned, this application makes this system sewage treatment efficiency high and stable, is convenient for maintain.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

labeled as: 1. a septic tank; 2.UASB reactor; 3. an anaerobic biofilter; 4. an anoxic tank; 5. an aerobic contact oxidation reactor; 6. a sedimentation tank; 7. a first pipeline; 8. a first pump; 9. a first valve; 10. a filler; 11. a second pipeline; 12. an electromagnetic valve; 13. a first branch pipe; 14. an anaerobic gas agitation system; 15. a second branch pipe; 16. an anoxic gas agitation system; 17. a third pipeline; 18. a second valve; 19. a fourth pipeline; 20. a third valve; 21. a fifth pipeline; 22. a fourth valve; 23. an aeration system; 24. a mixed liquid reflux gas stripping system; 25. a sixth pipeline; 26. a fifth valve; 27. a backwash system; 28. a seventh pipeline; 29. a sludge reflux gas stripping system; 30. a water inlet; 31. a partition plate; 32. a port; 33. a first channel; 34. a sixth valve; 35. and (7) a water outlet.

Detailed Description

Example 1

As shown in figure 1, the rural domestic sewage treatment system comprises a septic tank 1, a reaction tank and a sedimentation tank 6.

There is the water inlet 30 that is used for the circulation of the target sewage that contains mud on the septic tank 1, has baffle 31 in the septic tank 1, and preferred baffle 31 quantity is two, all has opening 32 on every baffle 31, and baffle 31 is used for separating out sewage treatment chamber one, sewage treatment chamber two, sewage treatment chamber three in septic tank 1, and opening 32 is used for the circulation of target sewage, specifically is: target sewage flows into the septic tank 1 from the water inlet 30, sequentially passes through the sewage treatment chamber I, the sewage treatment chamber II and the sewage treatment chamber III to be respectively fermented and precipitated, and the treated target sewage enters the next reaction tank.

The septic tank 1 is also provided with a first channel 33, and when the septic tank 1 needs to be cleaned, the first channel 33 can be connected with an external cleaning device to clean the septic tank 1.

The reaction tank comprises an anaerobic reaction tank, an anoxic tank 4 and an aerobic reaction tank, the anaerobic reaction tank comprises a UASB reactor 2 and an anaerobic biological filter 3, and the aerobic reaction tank is an aerobic contact oxidation reactor 5.

The UASB reactor 2 is connected with the septic tank 1 through a first pipeline 7, a first pump 8 is arranged on the first pipeline 7, and preferably, the first pump 8 is a peristaltic pump; a valve I9 is arranged between a pump I8 and the UASB reactor 2, a preferable valve I9 is a cut-off valve, the valve I9 is used for controlling the flow of target sewage in a pipeline I7, a reaction zone I is arranged in the UASB reactor 2, a sludge bed is arranged in the reaction zone I, the lower part of the sludge bed is provided with a filler 10, the preferable filler 10 is a honeycomb stone filler loaded with nano magnesium oxide, the upper part of the sludge bed is provided with a sludge suspension layer, the upper part of the sludge suspension layer is provided with a separator, the preferable separator is a gas-liquid-solid three-phase separator, and the separator is connected with a settling zone; wherein, because the filler 10 has an adsorption effect, the filler 10 can be used for primarily treating target sewage containing sludge, and the treatment speed and the treatment strength of the UASB reactor 2 are increased; the sludge bed can degrade most organic pollutants in the target sewage into methane I through anaerobic fermentation; the sludge suspension layer can further decompose organic matters in the sewage through bacteria, the separator can separate methane, sludge and sewage, and the settling zone is used for settling the sludge; the specific process is as follows: the method comprises the steps that target sewage containing sludge enters from the bottom of a UASB reactor 2 and sequentially passes through a filler, a sludge bed, a sludge suspension layer and a separator upwards, first methane separated by the separator is discharged from the UASB reactor 2 and enters an external methane collector, sludge separated by the separator enters a settling zone and sinks to the bottom of the UASB reactor 2, and the target sewage separated by the separator enters a next reaction tank.

The UASB reactor 2 is through the interface one of two 11 connection solenoid valves of pipeline, it is two-position three solenoid valve to prefer solenoid valve 12, solenoid valve 12 is connected with outside pump two, two 11 outside sewage concentration detector of intercommunication of pipeline, sewage concentration detector is used for detecting the concentration of the target sewage after 2 processing of UASB reactor, the anaerobism filtering pond 3 is connected through being divided pipe one 13 to two interface of solenoid valve 12, the oxygen deficiency pond 4 is connected through being divided pipe two 15 to three interface of solenoid valve 12, solenoid valve 12 is arranged in the target sewage inflow branch pipe one 13 or being divided pipe two 15 in the control pipeline two 11, specifically do: the sewage concentration detector communicated with the second pipeline 11 detects the concentration of target sewage treated by the UASB reactor 2, if the concentration is higher, the electromagnetic valve 12 is communicated with the first interface and the second interface, the sewage in the second pipeline 11 flows into the anaerobic biological filter 3 from the first branch pipe 13, the anaerobic biological filter 3 is connected with the anoxic tank 4 through a third pipeline 17, the third pipeline 17 is provided with a second valve 18, the second valve 18 is preferably a cut-off valve, the second valve 18 is connected with an external third pump, and the third pipeline 17, the second valve 18 and the third pump are used for conveying the target sewage treated by the anaerobic biological filter 3 into the anoxic tank 4; if the concentration is lower, the electromagnetic valve 12 is communicated with the first connector and the third connector, and the sewage in the second pipeline 11 flows into the anoxic tank 4 from the second branch pipe 15.

There is the adnexed filter material of anaerobism microorganism in the anaerobism biofilter 3, and the filter material is used for handling target sewage, has anaerobism oxygen mixing system 14 in the anaerobism biofilter 3 in addition, and anaerobism gas mixing system 14 is used for accelerating respectively and increaseing the contact velocity and the area of anaerobism microorganism and target sewage of suspension in the anaerobism biofilter 3 in the filter material space, and concrete process is: the anaerobic stirring system 14 is used for stirring the anaerobic microorganisms and the target sewage which are suspended in the gaps of the filter materials, so that the suspended anaerobic microorganisms are fully contacted with the target sewage, organic matters in the target sewage are degraded into a second methane by the suspended anaerobic microorganisms on the filter materials, the second methane is discharged from the anaerobic biological filter 3 and enters an external methane collector, and the target sewage treated by the anaerobic biological filter 3 enters a next reaction tank.

Denitrifying bacteria are arranged in the anoxic tank 4 and used for treating target sewage, and an anoxic gas stirring system 16 is arranged in the anoxic tank and used for accelerating and increasing the contact speed and the contact area of the denitrifying bacteria and the target sewage respectively by the anoxic gas stirring system 16.

The anoxic tank 4 is connected with the aerobic contact oxidation reactor 5 through a pipeline four 19, a valve three 20 is arranged on the pipeline four 19, preferably, the valve three 20 is a cut-off valve, the valve three 20 is connected with an external pump four, an aeration system 23 is arranged in the aerobic contact oxidation reactor 5, the aeration system 23 can enable air to be in full contact with target sewage, the dissolved oxygen content in the target sewage is improved, and aerobic microorganisms in the aerobic contact oxidation reactor 5 can rapidly propagate and treat the target sewage.

The aerobic contact oxidation reactor 5 is further connected with the anoxic tank 4 through a pipeline five 21, a valve four 22 is arranged on the pipeline five 21, preferably, the valve four 22 is a cut-off valve, a mixed liquid backflow gas system 24 is further arranged on the pipeline five 21 between the valve four 22 and the aerobic contact oxidation reactor 5, the mixed liquid backflow gas system 24 is connected with an external gas stripping pump I, the mixed liquid backflow gas system 24 enables target sewage treated by the aerobic contact oxidation reactor 5 to flow back into the anoxic tank 4 through gas stripping, secondary denitrification treatment is carried out through denitrifying bacteria to obtain sewage subjected to secondary denitrification treatment, and the valve four 22 can adjust the gas flow of the mixed liquid backflow gas system 24 to control the gas stripping backflow amount.

The sedimentation tank 6 is connected through six 25 connection sedimentation tanks of pipeline to oxygen deficiency pond 4, and six 25 last valves of pipeline have five 26, and five 26 preferred valves are the block valve, and five 26 of valve are connected with outside pump six, have delivery port 35 on the sedimentation tank 6, and outside sewage discharge system is connected to delivery port 35, specifically is: and (3) opening a valve V26, conveying the sewage subjected to secondary denitrification treatment in the anoxic tank 4 into the sedimentation tank 6 through a pipeline VI 25, performing cement separation on the target sewage by the sedimentation tank 6, and allowing the separated target sewage to flow into an external sewage discharge system from a water outlet 35.

The sedimentation tank 6 is further connected with the anaerobic biological filter 3 through a seventh pipeline 28, a seventh pipeline 28 is provided with a sludge backflow air-lift system 29, a sixth pipeline 34 is arranged on the seventh pipeline 28 between the sludge backflow air-lift system 29 and the anaerobic biological filter 3, the sludge backflow air-lift system 29 is connected with a second external air-lift pump, and the sludge backflow air-lift system 29 is used for backflow of sludge at the bottom of the sedimentation tank 6 into the anaerobic biological filter 3, so that the sludge concentration of the whole system tends to a stable state.

A back washing system 27 is arranged in the sedimentation tank 6, the back washing system 27 is used for cleaning the sedimentation tank 6, the sedimentation tank 6 is prevented from being blocked, and the benign operation of the whole system can be maintained.

The rural domestic sewage treatment system that this application provided, the working process is like this: the method comprises the following steps that target sewage containing sludge outside flows in from a water inlet 30 of a septic tank 1, sequentially passes through a sewage treatment chamber I, a sewage treatment chamber II and a sewage treatment chamber III to be fermented and precipitated respectively, a pump I8 is started, a valve I9 is opened, the target sewage treated by the septic tank 1 flows into the bottom of a UASB reactor 2 from a pipeline I7, the pump I8 and the valve I9 are closed, the target sewage sequentially passes upwards through a filler 10, a sludge bed, a sludge suspension layer and a separator in the UASB reactor 2, the filler 10 adsorbs and primarily treats the target sewage, and the sludge bed performs anaerobic fermentation and degradation on most organic pollutants in the target sewage into a methane I; the sludge suspended layer further decomposes organic matters in the sewage through bacteria, then a separator separates out methane I, sludge and sewage, the sludge sinks into the bottom of the UASB reactor 2 from a settling area of the UASB reactor 2, and the methane I is discharged from the UASB reactor 2 and enters an external methane collector; starting an external pump II connected with the electromagnetic valve 12, introducing the target sewage separated by the UASB reactor 12 separator into a pipeline II 11, and detecting the concentration of the target sewage by an external sewage concentration detector communicated with the pipeline II 11 to obtain the following two results:

firstly, if the concentration is high, the electromagnetic valve 12 is communicated with the first connector and the second connector, target sewage in the second pipeline 11 flows into the anaerobic biological filter 3 from the first branch pipe 13, the electromagnetic valve 12 is closed, the anaerobic stirring system 14 is opened, organic matters in the target sewage are degraded into second methane by anaerobic microorganisms of filter materials in the anaerobic biological filter 3 and anaerobic microorganisms suspended in gaps of the filter materials, the second methane is discharged from the anaerobic biological filter 3 and enters an external methane collector, an external pump III connected with the second valve 18 is started, the valve II 18 is opened, the target sewage treated by the anaerobic biological filter 3 enters the anoxic tank 4 from the third pipeline 17, the pump III and the valve II 18 are closed, the gas stirring system 16 is started to stir the target sewage and denitrifying bacteria in the anoxic tank 4, the reaction of the target sewage and the denitrifying bacteria is accelerated, after the reaction is finished, the anoxic stirring system 16 is closed, the external pump IV connected with the third valve 20 is started, the valve III 20 is opened, the target sewage after the reaction in the anoxic tank 4 enters the aerobic contact oxidation reactor 5 from the fourth pipeline IV 19, the aerobic reaction reactor 5 is closed, the aerobic reaction system 23 is fully, the aerobic reaction system is started, the aerobic reaction reflux treatment, the aerobic reaction system 23 is fully, the aerobic reaction reflux treatment system is closed, the aerobic reaction reflux treatment, the aerobic reaction system 22 is closed, the aerobic reaction reflux treatment system is fully, the aerobic reaction reflux treatment system 22 is started, the aerobic reaction reflux treatment is started, the aerobic reaction aeration system 22 is started, the aerobic reaction reflux treatment system 23, the aerobic reaction reflux treatment is started, the aerobic reaction reflux treatment system 22 is closed, and (3) allowing the target sewage subjected to secondary denitrification treatment to enter a sedimentation tank 6 from a pipeline six 25, closing a valve five 26 and a pump six, performing cement separation on the target sewage by the sedimentation tank 6, allowing the separated target sewage to flow into an external sewage discharge system from a water outlet 35, opening a sludge reflux air-stripping system 29 and an air-stripping pump two, opening the valve six 34, allowing the separated sludge to flow back into the anaerobic biological filter 3 from a pipeline seven 28, so that the sludge concentration of the whole system tends to a stable state, and then closing the sludge reflux air-stripping system 29, the air-stripping pump two and the valve six 34.

Secondly, if the concentration is lower, the electromagnetic valve 12 is communicated with the first connector and the second connector, the target sewage in the second pipeline 11 flows into the anoxic tank 4 from the second branch pipe 15, and all treatment steps after flowing into the anoxic tank 4 are the same as those of the first treatment step;

in addition, the system requires periodic cleaning: (1) When the septic tank 1 needs to be cleaned, an external cleaning device connected with the first channel 33 is opened to clean the septic tank 1; (2) And a back washing system 27 in the sedimentation tank 6 is started to clean the sedimentation tank 6, so that the sedimentation tank 6 is prevented from being blocked, and the benign operation of the whole system is maintained.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A rural domestic sewage treatment system comprises a septic tank (1), a reaction tank and a sedimentation tank (6), and is characterized in that the reaction tank comprises an anaerobic reaction tank, an anoxic tank (4) and an aerobic reaction tank,

the anaerobic reaction tank comprises a UASB reactor (2) and an anaerobic biological filter (3),

the aerobic reaction tank is an aerobic contact oxidation reactor (5),

the septic tank (1) is used for collecting and primarily treating target sewage containing sludge, and the reaction tank and the sedimentation tank (6) are used for retreating the target sewage containing sludge treated by the septic tank (1).

2. The rural domestic sewage treatment system according to claim 1, wherein the septic tank (1) is connected to the UASB reactor (2) through a first pipe (7), the first pipe (7) is provided with a first pump (8), and the first pipe (7) is used for circulating target sewage;

there is baffle (31) in septic tank (1), there is opening (32) on baffle (31), baffle (31) are used for separate different sewage treatment cavities in septic tank (1), opening (32) are used for the circulation of target sewage, there is passageway (33) on septic tank (1), outside cleaning device is cleared up in passageway (33) connection septic tank (1).

3. The rural domestic sewage treatment system according to claim 2, wherein there is a valve (9) between the pump (8) and the UASB reactor (2), and a packing (10) is provided in the UASB reactor (2), and the packing (10) is used for accelerating and increasing the treatment speed and intensity of the UASB reactor (2), respectively.

4. The rural domestic sewage treatment system according to claim 1, wherein the UASB reactor (2) is connected with a first port of an electromagnetic valve (12) through a second pipeline (11), a second port of the electromagnetic valve (12) is connected with the anaerobic biofilter (3) through a first branch pipe (13), a third port of the electromagnetic valve (12) is connected with the anoxic pond (4) through a second branch pipe (15), and the electromagnetic valve (12) is used for controlling the target sewage in the second pipeline (11) to flow into the first branch pipe (13) or the second branch pipe (15).

5. The rural domestic sewage treatment system according to claim 1, wherein an anaerobic gas stirring system (14) is arranged in the anaerobic biofilter (3), an anoxic gas stirring system (16) is arranged in the anoxic pond (4), and both the anaerobic gas stirring system (14) and the anoxic gas stirring system (16) are used for stirring target sewage.

6. The rural domestic sewage treatment system of claim 1, wherein the anaerobic biological filter (3) is connected to the anoxic tank (4) through a third pipe (17), and the third pipe (17) is provided with a second valve (18).

7. The rural domestic sewage treatment system according to claim 1, wherein the anoxic tank (4) is connected to the aerobic contact oxidation reactor (5) through a fourth pipe (19), the fourth pipe (19) has a third valve (20), an aeration system (23) is arranged in the aerobic contact oxidation reactor (5), and the aeration system (23) is used for accelerating the treatment speed of the target sewage.

8. The rural domestic sewage treatment system according to claim 1, wherein the aerobic catalytic oxidation reactor (5) is further connected to the anoxic tank (4) through a fifth pipe (21), the fifth pipe (21) is provided with a mixed liquor reflux gas stripping system (24) and a fourth valve (22), and the mixed liquor reflux gas stripping system (24) is used for refluxing the target sewage from the aerobic catalytic oxidation reactor (5) into the anoxic tank (4);

the anoxic tank (4) is also connected with the sedimentation tank (6) through a pipeline six (25), and a valve five (26) is arranged on the pipeline six (25).

9. The rural domestic sewage treatment system according to claim 1, wherein the sedimentation tank (6) is connected with the anaerobic biological filter (3) through a seventh pipeline (28), a sludge reflux air-stripping system (29) is arranged on the seventh pipeline (28), and the sludge reflux air-stripping system (29) is used for refluxing sludge at the bottom of the sedimentation tank (6) into the anaerobic biological filter (3);

a back washing system (27) is arranged in the sedimentation tank (6), and the back washing system (27) is used for cleaning the sedimentation tank (6).

10. The rural domestic sewage treatment system according to claim 1, wherein the septic tank (1) is provided with a water inlet (30) for the circulation of the target sewage, the sedimentation tank (6) is further provided with a water outlet (35) for the circulation of the target sewage, and the water outlet (35) is connected with an external sewage discharge system.

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