CN112624499A

CN112624499A - Integrated single-family and household-connected rural domestic sewage treatment method

Info

Publication number: CN112624499A
Application number: CN202011433356.6A
Authority: CN
Inventors: 陈昢圳; 陈栋凯; 郑向群
Original assignee: Agro Environmental Protection Institute Ministry of Agriculture
Current assignee: Agro Environmental Protection Institute Ministry of Agriculture
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-04-09
Anticipated expiration: 2040-12-10
Also published as: CN112624499B

Abstract

The invention relates to the field of sewage treatment, and provides an integrated single-family household rural domestic sewage treatment method, which comprises the following steps: filtering precipitates, filtering multi-medium biological contact oxidation, filtering polyurethane sponge filler, performing MBR (membrane bioreactor) membrane reaction, precipitating sludge, performing deep filtration, deodorizing and filtering gas, and performing disinfection treatment; the system comprises a single-family channel, a joint-family channel, a multi-media biological contact oxidation filtration unit, a polyurethane sponge filler filtration unit, a sludge sedimentation unit and a sludge sedimentation unit, wherein the single-family channel and the joint-family channel are connected in parallel, precipitate filtration, depth filtration, gas deodorization filtration and disinfection treatment are carried out in the two channels, the single-family channel. The method provided by the invention is provided with two independent channels of single household and joint household, can simultaneously treat domestic sewage generated by single household and joint household, saves energy, reduces emission, reduces operating cost, is simple to operate, has good treatment effect, has no influence on the surrounding environment, and conforms to the rural life style.

Description

Integrated single-family and household-connected rural domestic sewage treatment method

Technical Field

The invention relates to the technical field of sewage treatment, in particular to an integrated single-family household rural domestic sewage treatment method.

Background

In recent years, China continuously pays more attention to rural human living environment improvement and rural ecological happiness, wherein the treatment of rural domestic sewage is a key link. With the improvement of living standard, the total amount of sewage generated in rural areas of China every year is continuously improved. The treatment rate of rural sewage in China is less than 10%, and a large amount of rural sewage is directly discharged without any treatment, so that the reutilization rate is extremely low, and the water recycling method also poses great threats to rural water ecological systems and drinking water safety problems of villagers.

At present, rural domestic sewage treatment comprises ecological treatment modes of artificial wetlands, soil infiltration, stabilization ponds and the like for decentralized treatment and a treatment mode of collecting underground pipe networks for centralized treatment to a sewage treatment plant. The decentralized processing mode accords with rural geographical terrain conditions, but also has the defects of large occupied area, running obstacle in winter and unstable processing effect; the centralized treatment mode has better treatment effect and high hydraulic load, but more ground conditions and economic conditions in rural areas can not meet the laying of centralized underground pipe networks.

Aiming at the problems, the integrated sewage treatment equipment which has small occupied area, good treatment effect and convenient management becomes common equipment for treating rural domestic sewage, and the current integrated treatment process is more and comprises the following steps: A/O process, SBR process, biological contact oxidation process and MBR process. The integrated equipment of the A/O process lacks a sludge reflux system, so that flora is difficult to form in the device, and the treatment efficiency of the equipment is reduced. The integrated equipment of the SBR method has higher requirement on a core component water filter, and the cost is increased. The integrated equipment of the biological contact oxidation method is easy to generate the problems of sludge expansion and the like. The integrated equipment of the MBR process has better sewage treatment efficiency, but the treatment cost is increased when a single household with small sewage amount is treated because of the high membrane manufacturing cost.

Disclosure of Invention

According to the problems existing in the background technology, the invention provides an integrated single-family household rural domestic sewage treatment method, which comprises the following steps:

filtering the precipitate: filtering the domestic sewage by using precipitates;

biological contact oxidation filtration by using a multi-stage medium: performing multi-stage medium biological contact oxidation filtration on the domestic sewage after the precipitate filtration treatment;

filtering polyurethane sponge filler: performing polyurethane sponge filler filtration on the domestic sewage after the biological contact oxidation filtration of the multi-stage medium;

MBR membrane reaction: performing MBR membrane reaction on the domestic sewage after biological contact oxidation filtration of the multi-stage medium;

sludge precipitation: carrying out sludge precipitation on the domestic sewage after the MBR membrane reaction;

gas deodorization and filtration: performing gas deodorization and filtration on the domestic sewage after polyurethane sponge filler filtration or sludge precipitation;

and (3) disinfection treatment: sterilizing the domestic sewage after the gas deodorization and filtration;

the system is characterized in that a single-family channel and a joint-family channel which are connected in parallel are arranged, precipitate filtration, depth filtration, gas deodorization and disinfection treatment are carried out in the two channels, only multi-stage medium biological contact oxidation filtration and polyurethane sponge filler filtration are carried out in the single-family channel, and only MBR membrane reaction and sludge precipitation are carried out in the joint-family channel.

Optionally, during the sediment filtration, the sediment is filtered through grids with different thicknesses, and a water-impermeable barrier plate is arranged to block the sediment.

Optionally, the multi-stage media biological contact oxidation filtration comprises aeration, coarse sand filtration, ceramsite filtration and high-carbon substance filtration.

Optionally, the MBR membrane is made of PE, PS, or ceramic membrane.

Optionally, the gas deodorizing filtration is accomplished by aerobic bacteria, anaerobic bacteria and/or facultative bacteria.

Optionally, a regulating chamber is used for filtering the sediments, a filtering device and a fine grid are arranged in the regulating chamber, wherein the filtering device divides the regulating chamber into two spaces, the fine grid is arranged at an overflow port of the regulating chamber, the lower part of the filtering device is a waterproof blocking plate, and the upper part of the filtering device is a coarse grid.

Optionally, a multi-stage medium biological contact oxidation filtering chamber is used for carrying out multi-stage medium biological contact oxidation filtering, the multi-stage medium biological contact oxidation filtering chamber is sequentially divided into an aeration tank, a coarse sand tank, a ceramsite tank and a carbon source tank according to the sewage flow direction, two adjacent tanks are communicated in an overflow mode, an aeration device is arranged in the aeration tank, coarse sand is filled in the coarse sand tank, ceramsite is filled in the ceramsite tank, and a high-carbon substance is filled in the carbon source tank.

Optionally, an MBR membrane reaction chamber is used for MBR membrane reaction, and at least one layer of detachable biological membrane is arranged inside the MBR membrane reaction chamber.

Optionally, the polyurethane sponge filler oxidation chamber is filled with polyurethane sponge, the filling amount is 2/3-5/6 in total, and a specific selected microbial inoculum is put into the sponge filler.

Optionally, the gas deodorization is filtered by using a depth filtering chamber and a gas deodorization chamber, a vent pipe is installed above the depth filtering chamber and the gas deodorization chamber, a fine grid is installed inside the depth filtering chamber and the gas deodorization chamber, and the fine grid is installed at an overflow port of the depth filtering chamber and the gas deodorization chamber, which leads to the next processing chamber.

The beneficial effects of the invention include: the method provided by the invention is provided with two independent channels of a single household and a joint household, different channels are selected according to different numbers of farmers who process the generated domestic sewage, the energy is saved, the emission is reduced, the operation cost is reduced, the operation is simple, the processing effect is good, the surrounding environment is not influenced, and the rural life style is fitted.

Drawings

In order that the invention may be more readily understood, it will be described in more detail with reference to specific embodiments thereof that are illustrated in the accompanying drawings. These drawings depict only typical embodiments of the invention and are not therefore to be considered to limit the scope of the invention.

FIG. 1 is a flow chart of the method of the present invention.

Fig. 2 is a diagram of an application of one embodiment of the method of the present invention.

Fig. 3 is a transverse cross-sectional view of the apparatus in the embodiment shown in fig. 2.

Reference numerals

The device comprises a water inlet 1, a regulating chamber 101, a multi-stage medium biological contact oxidation cavity 102, a polyurethane sponge filler oxidation chamber 103, an MBR membrane reaction chamber 104, a sludge precipitation chamber 105, a depth filtration and gas deodorization chamber 106, a disinfection chamber 107, a first space 2, a filter device 3, a second space 4, a fine grid 5, a first overflow port 6, an aeration tank 7, an eighth overflow port 8, a second overflow port 9, a coarse sand tank 10, a third overflow port 11, a ceramsite tank 12, a biological membrane 13, a fourth overflow port 14, a carbon source tank 15, a fifth overflow port 16, a biological membrane 17, a ninth overflow port 18, a polyurethane sponge filler 19, a sixth overflow port 20, a fine grid 21, a tenth overflow port 22, a vent pipe 23, a seventh overflow port 24 and a water outlet 25.

Detailed Description

Embodiments of the present invention will now be described with reference to the drawings, wherein like parts are designated by like reference numerals. The embodiments described below and the technical features of the embodiments may be combined with each other without conflict.

The small-sized integrated single-family household rural domestic sewage treatment method comprises two process flows to respectively deal with the problem of different numbers of farmers who treat and generate domestic sewage, and the equipment can realize rural domestic sewage purification to form rural domestic sewage purification equipment.

As shown in FIG. 1, the integrated single household rural domestic sewage treatment method comprises steps S1-S7.

S1, precipitate filtration: filtering the domestic sewage by using different grids with different thicknesses.

S2, biological contact oxidation filtration by using a multi-stage medium: and (3) performing multistage medium biological contact oxidation filtration on the domestic sewage after the precipitate filtration treatment, wherein the multistage medium biological contact oxidation filtration comprises aeration, coarse sand filtration, ceramsite filtration and high-carbon substance filtration.

S3, filtering the polyurethane sponge filler: and (3) filtering the domestic sewage subjected to the biological contact oxidation filtration treatment of the multi-stage medium by using a polyurethane sponge filler.

S4, MBR membrane reaction: and performing MBR membrane reaction on the domestic sewage after the precipitate is filtered, wherein the MBR membrane is made of PE, PS, ceramic membrane and other materials.

S5, sludge precipitation: and (4) carrying out sludge precipitation on the domestic sewage after the MBR membrane reaction.

S6, depth filtration and gas deodorization treatment: and (3) performing gas deodorization and filtration on the domestic sewage after polyurethane sponge filler filtration or sludge precipitation, wherein the gas deodorization and filtration are completed by aerobic bacteria, anaerobic bacteria and facultative bacteria.

S7, disinfection treatment: and (4) disinfecting the domestic sewage after deep filtration and gas deodorization treatment.

The integrated rural single-family household sewage treatment method has different internal treatment channels which are selected according to different numbers of the farmers who treat and generate the domestic sewage. And setting a single-family channel and a joint-family channel, and performing step S1, step S6 and step S7 in the single-family channel and the joint-family channel. Step S2 and step S3 are performed in the single-user channel. The steps S4 and S5 are performed in the affiliated channel. When 1 family (4-5 people) is treated to generate sewage, the sewage is treated through a single family channel. When sewage is generated by more than 2 households (5-8 households), the sewage is treated through the household-connected channel.

Alternatively, as shown in fig. 2 and 3, in the precipitate filtration of step S1, the following embodiment may be employed.

Domestic sewage is discharged into a regulating chamber 101 through a water inlet 1, and a filtering device 3 and a fine grid 5 are arranged in the regulating chamber 101. Alternatively, the pore size of the filter device 3 may be, for example, 25 × 25mm, and the pore size of the fine grid 5 may be, for example, 10 × 10 mm. The precipitate filtration is performed by means of a filter device 3 and a fine grid 5.

The filter device 3 divides the conditioning chamber 101 into a first space 2 and a second space 4. Domestic sewage enters the conditioning chamber 101 from the water inlet 1 and flows into the first space 2 first. The lower part of the filter device 3 is a water-tight barrier for blocking the filtered sediment, which is located at the bottom of the first space 2. The domestic sewage flows into the second space 4 through the filtering device 3 in an overflow manner. A fine grid 5 is arranged in the second space 4. The fine grating 5 filters the domestic sewage again. A fine grid 5 may be provided on the first overflow 6 of the conditioning chamber 101.

Alternatively, the conditioning chamber 101 is 15-35 cm long, 70-100 cm wide, and 100-130 cm high. The filtering device 3 is positioned in the middle of the regulating chamber 101, and the lower part of the filtering device 3 is a waterproof separation plate with the width of 1-3 cm, the thickness of 60-80 cm. And a sludge clearing opening is formed at the lower end of the part from the water inlet 1 to the impermeable baffle plate. The upper part of the filtering device 3 is provided with a coarse grid which is arranged on the impervious blocking plate, and the height of the coarse grid is 30-50 cm.

Alternatively, as shown in fig. 2 and 3, in the multi-stage media bio-contact oxidation filtration of step S2, the following embodiments may be adopted.

Discharging the domestic sewage treated in the step S1 into the multi-stage medium biological contact oxidation chamber 102 in an overflow manner, wherein optionally, the multi-stage medium biological contact oxidation chamber 102 is connected after the regulation chamber 101, and the two chambers are communicated through the first overflow port 6. Alternatively, the multi-stage medium biological contact oxidation chamber 102 has a length of 30-60 cm, a width of 30-50 cm and a height of 100-130 cm.

The multi-stage medium biological contact oxidation chamber 102 is sequentially divided into an aeration tank 7, a coarse sand tank 10 and a ceramsite tank 12 carbon source tank 15. Respectively carrying out aeration treatment, coarse sand filtration, ceramsite filtration and high carbon source substance filtration.

The aeration tank 7 is communicated with the grit chamber 10 through a second overflow port 9. The coarse sand pool 10 is communicated with the ceramsite pool 12 through a third overflow port 11. The ceramsite pool 12 is communicated with the carbon source pool 15 through a fourth overflow port 14.

The sewage treated by the adjusting chamber 101 enters the aeration tank 7 through the first overflow outlet 6. Aeration equipment is installed in the aeration tank 7, and is used for carrying out aeration treatment on domestic sewage, so that the aerobic microorganisms are benefited to the aerobic effect, and the sewage treatment efficiency is improved.

Optionally, the aeration tank 7 has a length of 10-20 cm, a width of 30-50 cm and a height of 100-130 cm, and is internally provided with a blast aeration device, a conduit chamber aeration device or a mechanical aeration device for aeration.

The grit chamber 10 is connected after the aeration tank 7. The domestic sewage after aeration treatment enters a coarse sand pool 10 through a second overflow port 9. The coarse sand pool 10 is filled with coarse sand, and the sewage treatment efficiency is improved by performing physical adsorption and filtration precipitation on domestic sewage. Optionally, the grit chamber 10 is 15-30 cm long, 30-50 cm wide and 100-130 cm high, and the grit chamber 10 is filled with grit having a fineness modulus of 3.1-3.7 and an average particle size of 0.35-0.5 mm, in an amount of 2/3-4/5 as a whole.

A ceramsite pool 12 is connected behind the coarse sand pool 10. The sewage treated by the coarse sand tank 10 flows into the ceramsite tank 12 through the third overflow port 11 in an overflow mode. The inside of the ceramsite pool 12 is filled with ceramsite, and the sewage treatment efficiency is improved by performing chemical precipitation, ion exchange and other actions on the domestic sewage. Optionally, the ceramsite pool 12 is 15-30 cm long, 30-50 cm wide, 100-130 cm high, and is internally filled with ceramsite with the particle size of 5-20 mm, and the filling amount is 2/3-4/5 of the whole body.

The carbon source tank 15 is connected behind the ceramsite tank 12. The sewage treated by the ceramsite pool 12 flows into the carbon source pool 15 from the fourth overflow port 14 in an overflow mode. The carbon source pool 15 is filled with grass carbon, straws, active carbon and the like, and the nitrification and denitrification capability of microorganisms are improved by increasing the C/N in the device, so that the removal efficiency of nitrogen in sewage is improved. Optionally, the carbon source pool 15 is filled with high-carbon substances such as activated carbon, straws and grass carbon, the carbon source pool 15 is 10-20 cm long, 30-50 cm wide and 100-130 cm high, and the activated carbon, straws and grass carbon are filled in the carbon source pool, and the filling amount is 1/2-2/3 of the total.

Alternatively, as shown in fig. 2 and 3, in the filtering of the polyurethane sponge filler in step S3, the following embodiments may be adopted.

And (3) discharging the domestic sewage treated in the step (S2) into a polyurethane sponge filler oxidation chamber 103 in an overflow mode, wherein the polyurethane sponge filler oxidation chamber 103 is connected behind the multi-stage medium biological contact oxidation chamber 102, and the two are communicated through a fifth overflow port 16. The sewage treated by the carbon source pool 15 of the multi-stage medium biological contact oxidation chamber 102 flows into the polyurethane sponge filler oxidation chamber 103 through the overflow port 16 in an overflow mode. The polyurethane sponge filler oxidation chamber 103 is filled with polyurethane sponge filler 19, and aerobic microorganisms are on the filler. The polyurethane sponge filler provides an attachment position for aerobic bacteria, increases the contact surface area of sewage and the aerobic bacteria, and further improves the sewage treatment efficiency.

Optionally, the polyurethane sponge filler oxidation chamber 103 is 40-60 cm long, 30-50 cm wide and 100-130 cm high, the interior of the oxidation chamber is filled with polyurethane sponge, the filling amount is 2/3-5/6 of the whole body, and the specific microbial inoculum is put into the sponge filler.

Alternatively, as shown in fig. 2 and 3, in the MBR membrane reaction of step S4, the following embodiment may be employed.

The domestic sewage treated in the step S1 is discharged into the MBR membrane reaction chamber 104 by an overflow manner.

The MBR membrane reaction chamber 104 is connected after the regulation chamber 101, and both are communicated through the eighth overflow port 8. Two layers of

biological membranes

13 and 17 are arranged in the MBR membrane reaction chamber 104. The

biological membranes

13 and 17 are detachable, the aperture of the membrane is 0.2-0.5 μm, and the material is PE, PS, ceramic membrane, etc. One curtain film or two curtain films can be selected according to the hydraulic load and pollution load of domestic sewage. The biological membrane can efficiently intercept microorganisms in the sewage, and the microorganisms on the biological membrane can degrade pollutants in the sewage to improve the sewage treatment capacity.

Optionally, the MBR membrane reaction chamber 104 has a length of 60-80 cm, a width of 30-50 cm, a height of 100-130 cm, two removable curtains of biological membranes inside, a membrane aperture of 0.2-0.5 μm, and is made of PE, PS, ceramic membranes, etc.

Alternatively, as shown in fig. 2 and 3, in the sludge settling in step S5, the following embodiment may be employed.

The domestic sewage treated in the step S4 is discharged into the sludge settling chamber 105 by an overflow manner. The sludge settling chamber 105 is connected behind the MBR membrane reaction chamber 104, and the sludge settling chamber and the MBR membrane reaction chamber are communicated through a ninth overflow port 18. The sewage treated by the MBR membrane reaction chamber 104 flows to the precipitation and filtration chamber 105 through the ninth overflow port 18 in an overflow mode. As the MBR membrane reaction chamber 104 can carry partial suspended particles in the sewage after sewage treatment, suspended matters are precipitated in the sludge precipitation chamber 105, so that the effluent quality of the equipment is improved.

Optionally, the sludge settling chamber 105 has a length of 20-40 cm, a width of 30-50 cm, a height of 100-130 cm, and a sludge cleaning opening at the bottom.

Alternatively, as shown in fig. 2 and 3, in the depth filtration and the gas deodorization filtration of step S6, the following embodiments may be employed.

The domestic sewage treated in the steps S3 and S5 is discharged into the depth filtration and gas deodorization chamber 106 by an overflow manner. A depth filtration and gas deodorization chamber 106 is connected after the polyurethane sponge filler oxidation chamber 103 and the sludge settling chamber 105. The depth filtration and gas deodorization chamber 106 and the polyurethane sponge filler oxidation chamber 103 are communicated through a sixth overflow port 20. The depth filtration and gas deodorization chamber 106 and the sludge settling chamber 105 are communicated through the tenth overflow port 22.

The domestic sewage treated by the polyurethane sponge filler oxidation chamber 103 flows to the depth filtering and gas deodorizing chamber 106 through the sixth overflow port 20 in an overflow mode. The sewage treated by the sludge settling chamber 105 flows to the depth filtering and gas deodorizing chamber 106 through the tenth overflow port 22 in an overflow manner.

A vent pipe is arranged above the deep filtering and gas deodorizing cavity 106, a membrane structure formed by highly enriched aerobic bacteria, anaerobic bacteria and facultative bacteria is arranged at the outlet of the vent pipe so as to absorb and remove the smell of the sewage, and a rain-proof cap is covered on the upper end of the vent pipe so as to prevent rainwater from recharging and influencing the sewage treatment efficiency.

Alternatively, the depth filtration and gas deodorization chamber 106 is 20-40 cm long, 70-100 cm wide, and 100-130 cm high. A vent pipe 23 with the diameter of 10-15 cm and the length of 30-50 cm is arranged above the depth filtering and gas deodorizing chamber 106.

Optionally, a fine grid 21 is installed in the depth filtering and gas deodorizing chamber 106 to perform secondary filtering on the sewage to improve the quality of the effluent water of the device.

Alternatively, as shown in fig. 2 and 3, in the sterilization process of step S7, the following embodiment may be employed.

The domestic sewage treated in the step S6 is discharged into the disinfection chamber 107 by an overflow manner. A disinfection chamber 107 is connected after the depth filtration and gas deodorization chamber 106. The treated sewage flows through the seventh overflow port 24 to the disinfection chamber 107 in an overflow manner. The sterilization chamber 107 contains a sterilization agent. The sewage is mixed with the disinfectant in the disinfection chamber 107, the sewage is subjected to harmless treatment to meet the discharge requirement, and the treated sewage flows out of the equipment through the water outlet 25 in an overflow mode to be discharged.

Optionally, the disinfection chamber 107 is 20-40 cm long, 30-50 cm wide and 100-130 cm high, and allows the sewage to be mixed with a disinfectant in a disinfection tank to complete the disinfection process.

It can be seen that in one embodiment, the apparatus for carrying out the wastewater treatment process comprises 7 chambers: a regulating chamber 101, a multi-stage medium biological contact oxidation chamber 102, a polyurethane sponge filler oxidation chamber 103, an MBR membrane reaction chamber 104, a sludge precipitation chamber 105, a deep filtration and gas deodorization chamber 106 and a disinfection chamber 107.

When sewage of 1 family (4-5 persons) is treated, the sewage flows into the conditioning chamber 101, the multi-stage medium biological contact oxidation chamber 102, the sludge settling chamber 105, the depth filtration and gas deodorization chamber 106, the disinfection chamber 107, and then is discharged.

When sewage of more than 2 households (5-8 households) is treated, the sewage flows into the regulating chamber 101, and the treated sewage flows to the MBR membrane reaction chamber 104 from the eighth overflow port 8 in an overflow mode. Therefore, the multi-stage medium biological contact oxidation chamber 102 and the polyurethane sponge filler oxidation chamber 103 form a channel, the MBR membrane reaction chamber 104 and the sludge precipitation chamber 105 form a channel, and the two channels are connected in parallel. Wherein the fine grid 5 is arranged on the eighth overflow opening 8.

The beneficial effects of the invention can be confirmed from the following specific application examples: the device of the invention is operated in villagers in Ninghe area of Tianjin, and the operation result shows that the total hydraulic retention time of the device is short and the sludge production amount is small. The sewage of single household and joint household can have high-efficient removal effect to total nitrogen, total phosphorus, ammonia nitrogen, COD and BOD5, and the treatment efficiency can generally reach: BOD5 and SS 90% or more, total nitrogen 80% or more, and phosphorus 90% or more.

The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.

Claims

1. An integrated single-family and multi-family rural domestic sewage treatment method is characterized in that,

filtering the precipitate: filtering the domestic sewage by using precipitates;

biological contact oxidation filtration by using a multi-stage medium: performing multi-stage medium biological oxidation filtration on the domestic sewage after the precipitate filtration treatment;

filtering polyurethane sponge filler: performing polyurethane sponge filler oxidation filtration on the domestic sewage subjected to biological contact oxidation filtration by using a multi-stage medium;

deep filtration: carrying out terminal filtration on sewage in a single-family or multi-family channel;

the system comprises a single-family channel, a joint-family channel, a multi-stage medium biological contact oxidation filtration device, a polyurethane sponge filler filtration device, a sludge sedimentation device, a sludge filtering device, a sludge storage device and a sludge treatment device, wherein the single-family channel and the joint-family channel are connected in parallel, sediment filtration, depth filtration, gas deodorization treatment and disinfection treatment are carried out in the two channels, the multi-stage medium biological contact oxidation filtration.

2. The integrated single-family-household rural domestic sewage treatment method according to claim 1, wherein during filtering of the precipitate, the precipitate is filtered through grids with different thicknesses, and a water-impermeable baffle plate is arranged to block the precipitate.

3. The integrated single-family-household rural domestic sewage treatment method according to claim 1, wherein the multistage medium biological contact oxidation filtration comprises aeration treatment, coarse sand filtration, ceramsite filtration and high-carbon substance filtration.

4. The integrated single-family-household rural domestic sewage treatment method according to claim 1, wherein the MBR membrane is made of PE, PS or ceramic membrane.

5. The integrated single-family-household rural domestic sewage treatment method according to claim 1, wherein the gas deodorization and filtration is performed by aerobic bacteria, anaerobic bacteria and/or facultative bacteria.

6. The integrated single-family-household rural domestic sewage treatment method according to claim 2, wherein a regulation chamber (101) is used for filtering sediments, a filtering device (3) and a fine grating (5) are arranged in the regulation chamber (101), wherein the filtering device (3) divides the regulation chamber (101) into two spaces, the fine grating (5) is arranged at an overflow port of the regulation chamber (101), the lower part of the filtering device (3) is a waterproof barrier plate, and the upper part of the filtering device is a coarse grating.

7. The integrated single-family household rural domestic sewage treatment method according to claim 1, wherein a multi-stage medium biological contact oxidation filtration chamber (102) is used for multi-stage medium biological contact oxidation filtration, the multi-stage medium biological contact oxidation filtration chamber (102) is sequentially divided into an aeration tank (7), a coarse sand tank (10), a ceramsite tank (12) and a carbon source tank (15) according to the sewage flow direction, two adjacent tanks are communicated in an overflow mode, an aeration device is arranged in the aeration tank (7), coarse sand is filled in the coarse sand tank (10), ceramsite is filled in the ceramsite tank (12), and a high-carbon substance is filled in the carbon source tank (15).

8. The integrated single-family-household rural domestic sewage treatment method according to claim 1, wherein an MBR membrane reaction chamber (104) is used for MBR membrane reaction, and at least one layer of detachable biological membrane is arranged inside the MBR membrane reaction chamber (104).

9. The integrated single household rural domestic sewage treatment method according to claim 1, wherein the polyurethane sponge filler oxidation chamber (103) is filled with polyurethane sponge, the filling amount is 2/3-5/6, and selected microbial inoculum is added into the sponge filler.

10. The integrated single-family multi-user rural domestic sewage treatment method according to claim 1, wherein a depth filtering and gas deodorizing chamber (106) is used for gas deodorizing and filtering, a vent pipe is arranged above the depth filtering and gas deodorizing chamber (106), a fine grid is arranged inside the depth filtering and gas deodorizing chamber (106), and the fine grid is arranged at an overflow port of the depth filtering and gas deodorizing chamber (106) which leads to the next processing chamber.