CN208776515U - Rural domestic sewage treating device - Google Patents

Abstract

The utility model relates to technical field of sewage, and in particular to rural domestic sewage treating device, comprising: activated sludge tank, sedimentation basin, biological membrane cisterna and sterilization pool；The first mud return line is connected between sedimentation basin and activated sludge tank, and sludge reflux pump is set on the first mud return line；Membrane module is set in biological membrane cisterna, and membrane module is connect with the outlet pipe of biological membrane cisterna, and membrane suction pump is arranged between membrane module and the outlet pipe of biological membrane cisterna；Shaker machine is arranged in sterilization pool middle position, and compound pump is arranged in sterilization pool.Rural domestic sewage treating device provided by the utility model, sewage flows into activated sludge tank, the organic matter in sewage is removed by the microorganism in activated sludge tank, sedimentation basin is by the sludge settling in sewage, oettIed sewage is by membrane module to the further filtration treatment of sewage, biomembrane treated water is delivered to sterilization pool carries out disinfection processing, enables country sewage to focus on, reduces the pollution to rural area water body and soil.

Description

Rural domestic sewage treating device

Technical field

The utility model relates to technical field of sewage, and in particular to rural domestic sewage treating device.

Background technique

Domestic sewage in rural areas occurs mainly with fertilizer and pesticide sewage, aquaculture wastewater, human and animal excreta and kitchen waste water etc..With The broad development of Agricultural Activities, environmental pollution caused by domestic sewage in rural areas is increasingly severe, so will be in time to rural area Sanitary sewage is handled.

The improvement of domestic sewage in rural areas is conducive to improve Ecological Environment, and power-assisted is in the development of rural economy.But agriculture Village's sanitary sewage is since the approach in source is diversified, including rural resident, rural area folklore tour, rural area livestock and poultry breeding industry, rural area Culture fishery, rural area periphery hotel and suburb enterprise and institution management unit etc. are generated with water and domestic sewage in rural areas The complexity multiplicity of middle pollutant, including the polluters such as total nitrogen, total phosphorus, COD, BOD.

Rural areas in our country development in the prior art falls behind relatively, and technical conditions are limited, and most of sewage is directly arranged Enter lake river or carry out soil infiltrating irrigation, causes the large-scale pollution of rural area water body and soil, seriously threaten agriculture Village's living environment.

Utility model content

The technical problem to be solved by the present invention is to overcome in the prior art sewage be directly discharged into lake river or Soil infiltrating irrigation is carried out, the large-scale pollution of rural area water body and soil is caused, seriously threatens life in the countryside environmental gap.

For this purpose, the technical solution used, rural domestic sewage treating device, comprising: pass through pipeline successively sequential series Activated sludge tank, sedimentation basin, biological membrane cisterna and sterilization pool；

Filter screen is set on the pipeline that sedimentation basin is connect with biological membrane cisterna, and the bottom of sedimentation basin is equipped with and activated sludge bottom of pond Sludge reflux pump is arranged close to one end of sedimentation basin in the first connected mud return line of portion, the first mud return line；

Membrane module is set in biological membrane cisterna, and the outlet pipe of membrane module and biological membrane cisterna passes through piping connection, membrane module and life Membrane suction pump is set between the outlet pipe of object membrane cisterna；

Shaker machine is arranged in sterilization pool middle position, and compound pump is arranged in the water inlet of sterilization pool.

In order to keep wastewater treatment efficiency more preferable, dirt Organic substance in water in anaerobic pond beginning is dropped with microorganism in sludge Solution, preferred technical solution is, activated sludge tank is connected to the water inlet of sedimentation basin, the activated sludge tank by anaerobic pond, lack Successively sequential series connection forms for oxygen pond and aerobic tank, and the first mud return line is connected to anaerobism bottom of pond portion.

In order to keep effluent cycle path longer, wastewater treatment efficiency is more preferable, and preferred technical solution is anaerobic pond, anoxic In pond, aerobic tank, the inlet and outlet that upper end, the lower end in each pond shift to install, after the water outlet in previous pond is The water inlet in one pond；The inlet and outlet of sedimentation basin are arranged at upper end.

In order to make organic pollutant removal in sewage more thoroughly, preferred technical solution is to be filled in anaerobic pond Anaerobic activated sludge is filled with hypoxia activity sludge in anoxic pond, is filled with aerobic activated sludge in aerobic tank.

In order to handle the reflux of organic matter containing nitre by sewage Microbial denitrogenation, preferred technical side Case is that nitrification liquid return pipe is installed between anaerobic pond and aerobic tank top, and reflux pump is arranged on nitrification liquid return pipe.

In order to keep wastewater treatment efficiency more preferable, dirt Organic substance in water in anaerobic pond beginning is dropped with microorganism in sludge Solution, preferred technical solution is that the second mud return line and sludge reflux pump are equipped between biological membrane cisterna and anaerobism bottom of pond portion.

In order to come into full contact with biological membrane cisterna activated sludge of becoming reconciled in oxygen pond with sewage, preferred technical solution is biology The interior bottom of membrane cisterna is equipped with the first aeration head and the first aeration branch pipe, and the interior bottom of aerobic tank is equipped with the second aeration head and Two aeration branch pipes, aerobic tank and the outer tip end of biological membrane cisterna are connected to by being aerated supervisor, and aeration pump is arranged on aeration supervisor.

In order to improve the rate of filtration of biological membrane cisterna, preferred technical solution is the water inlet setting inside biological membrane cisterna Water pump, towards the water inlet inside biological membrane cisterna, the water outlet of water pump exposes the water inlet of water pump towards biomembrane bottom of pond portion, second Gas head is located in biological membrane cisterna bottom and is located at the top of the second aeration head, the second sludge close to one end of its water outlet, membrane module Return pipe is located at biomembrane bottom of pond portion middle position.

In order to reduce the sewage treatment time of biological membrane cisterna, preferred technical solution is that the water outlet and aeration of water pump are led Pipe protrudes into the part connection of biological membrane cisterna, and the first blender, setting above membrane module are arranged between membrane module and the second aeration head Second blender, the first blender and the second blender direction of rotation on the contrary, the first blender and the second blender blade court Heating rod is respectively provided on the direction of membrane module, brush is arranged towards membrane module direction in heating rod, between brush and membrane module setting Gap.

Technical solutions of the utility model have the advantages that

Rural domestic sewage treating device provided by the utility model, sewage flow into activated sludge tank, pass through activated sludge Microorganism in pond degrades to the organic matter in sewage, and for sedimentation basin by the sludge settling in sewage, oettIed sewage is logical Membrane module is crossed to the further filtration treatment of sewage, biomembrane treated water is delivered to sterilization pool carries out disinfection processing makes rural area Sewage can focus on, and reduce the pollution to rural area water body and soil.

Detailed description of the invention

It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art Under the premise of labour, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is the overall structure diagram of the utility model；

Fig. 2 is the system framework figure of the utility model；

Fig. 3 is another structural schematic diagram of biological membrane cisterna in the utility model；

Fig. 4 is the further structural schematic diagram of biological membrane cisterna in the present invention；

Wherein, 1- activated sludge tank；1.1- anaerobic pond；1.2- anoxic pond；1.3- aerobic tank；1.3.1- the first aeration head； 1.3.2- the first aeration branch pipe；1.3.3- nitrification liquid return pipe；1.3.4- reflux pump；2- sedimentation basin；2.1- filter screen；2.2- the One mud return line；2.3- sludge reflux pump；3- biology membrane cisterna；3.1- membrane module；3.2- membrane suction pump；The second sludge of 3.3- returns Flow tube；3.4- sludge reflux pump；The second aeration head of 3.5-；Bis- aeration branch pipe of 3.6-；3.7- aeration supervisor；3.8- aeration pump； 3.9- water pump；4- sterilization pool；4.1- shaker machine；4.2- compound pump；The first blender of 5-；The second blender of 6-；7- heating rod；8- Brush.

Specific embodiment

The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical Novel protected range.

As shown in Figure 1, 2, the utility model provides rural domestic sewage treating device, comprising: successively suitable by pipeline The concatenated activated sludge tank 1 of sequence, sedimentation basin 2, biological membrane cisterna 3 and sterilization pool 4；On the pipeline that sedimentation basin 2 is connect with biological membrane cisterna 3 Filter screen 2.1 is set, the bottom of sedimentation basin 2 is equipped with the first mud return line 2.2 being connected with 1 bottom of activated sludge tank, and first Sludge reflux pump 2.3 is arranged close to one end of sedimentation basin 2 in mud return line 2.2；Membrane module 3.1, film group are set in biological membrane cisterna 3 Part 3.1 formed principle be: the sewage of nutriment and microbe inoculation filler surface flow, after a certain period of time, micro- life Object can be attached to filler surface and be proliferated and grow, and form one layer of thin biomembrane.The water outlet of membrane module 3.1 and biological membrane cisterna 3 By piping connection membrane suction pump 3.2 is arranged between membrane module 3.1 and the outlet pipe of biological membrane cisterna 3, membrane suction pump 3.2 is in pipe Vacuum pump；Shaker machine 4.1 is arranged in 4 middle position of sterilization pool, and compound pump 4.2 is arranged in the water inlet of sterilization pool 4.

The working principle of the utility model are as follows:

Rural domestic sewage treating device provided by the utility model, sewage flow into activated sludge tank 1, activated sludge tank 1 Sludge-like flocculate through being formed after a certain period of time because aerobic microorganism is bred, is inhabited micro- based on zoogloea thereon Biota, the ability with very strong absorption and oxidation of organic compounds are removed molten in sewage by the microorganism in activated sludge tank 1 Solution property and colloidal state biochemical organic matter and can be by the suspended solid of activated sludge absorption and some other substance, together When can also remove a part of phosphorus element and nitrogen, the sludge settling in sewage, oettIed sewage are passed through membrane module by sedimentation basin 2 The upper portion side wall of 3.1 pairs of further filtration treatments of sewage, sedimentation basin 2 is equipped with water outlet and filter screen 2.1, prevents sludge from flowing into life Object membrane cisterna 3, the bottom of sedimentation basin 2 are equipped with the first mud return line 2.2 being connected with 1 bottom of activated sludge tank, returned sludge by The sludge reflux pump 2.3 of 1 bottom of activated sludge tank is sent to activated sludge tank 1, and clear water is exported by sedimentation basin 2 and flows into biomembrane pond 3, Biomembrane treated water is delivered to sterilization pool carries out disinfection processing, enables country sewage to focus on, reduces to rural area The pollution of area's water body and soil；It is negative pressure in biological membrane cisterna 3 under the swabbing action of membrane suction pump 3.2, the film in biological membrane cisterna 3 The aperture small microfiltration membranes high using rejection effect of component 3.1, by the tiny particles content in the isolation technics filter sewage of film, Mud-water separation efficiency is substantially increased, microorganism can be completely trapped in biological membrane cisterna 3, can make to maintain in biological membrane cisterna 3 Higher biomass, the membrane module 3.1 being arranged in biological membrane cisterna 3 are filtered processing to sewage；The membrane module is immersed in life Under the liquid level of object membrane cisterna 3, membrane suction pump 3.2 is connected with membrane module 3.1；Biological 3 body of membrane cisterna is connected to sterilization pool 4, by biology The water of the processing of membrane cisterna 3 is delivered to sterilization pool；Disinfectant is transported in sterilization pool 4 by compound pump 4.2 in water inlet, sterilization pool 4 middle positions are provided with shaker machine 4.1, and shaker machine 4.1 is blender, can rapidly be uniformly dissolved drug.

In order to keep wastewater treatment efficiency more preferable, dirt Organic substance in water in anaerobic pond beginning is dropped with microorganism in sludge Solution, preferred technical solution is, activated sludge tank 1 is connected to the water inlet of sedimentation basin 2, and the activated sludge tank 1 is by anaerobic pond 1.1, successively sequential series connection forms for anoxic pond 1.2 and aerobic tank 1.3, and the first mud return line 2.2 is connected to anaerobic pond 1.1 Bottom, by the mixed liquor from aerobic tank 1.3, precipitation and separation, supernatant flow into life as water outlet to sedimentation basin 2 under the effect of gravity The sludge of object membrane cisterna 3, precipitating flows into anaerobic pond 1.1 from the first mud return line 2.2.

In order to keep effluent cycle path longer, wastewater treatment efficiency is more preferable, and preferred technical solution is that anaerobic pond 1.1 lacks In oxygen pond 1.2, aerobic tank 1.3, the inlet and outlet that upper end, the lower end in each pond shift to install, previous pond goes out The mouth of a river is the water inlet in the latter pond；The inlet and outlet of sedimentation basin 2 are arranged at upper end, the water inlet of activated sludge tank 1 Mouth is mounted on the left end lower part of anaerobic pond 1.1, anaerobic pond 1.1 and 1.2 top connection of anoxic pond, anoxic pond 1.2 and aerobic tank 1.3 Bottom connection, the water outlet of activated sludge tank 1 are mounted on the right end top of aerobic tank 1.3, anoxic pond 1.2, sedimentation basin 2, biology The water inlet of membrane cisterna 3 pushes up 1-1.5m from pond, the anaerobic pond 1.1, aerobic tank 1.3, the water inlet of sterilization pool 4 and sterilization pool 4 Water outlet is from bottom of pond 1-2m；Anaerobic pond 1.1, anoxic pond 1.2, the appearance of aerobic tank 1.3, sedimentation basin 2, biological membrane cisterna 3, sterilization pool 4 Product is than being 1:1:1:1:1:1.

In order to make organic pollutant removal in sewage more thoroughly, preferred technical solution is to load in anaerobic pond 1.1 There is anaerobic activated sludge, hypoxia activity sludge is filled in anoxic pond 1.2, is filled with aerobic activated sludge in aerobic tank 1.3；Detest Take lower water inlet upper water-out form in oxygen pond 1.1, it is ensured that the solid matter in anaerobic pond 1.1 is not brought into next technique ring Section；Anoxic pond 1.2 takes enterprising underwater water outlet form, it is ensured that sewage comes into full contact with hypoxia activity sludge, to sewage Carry out denitrification denitrogenation processing；Aerobic tank 1.3 takes lower water inlet upper water-out form, it is ensured that sewage and aerobic activated sludge It comes into full contact with, nitrification processing is carried out to sewage, flow into filling after the anaerobic bacteria in anaerobic activated sludge releases sewage phosphorus processing There is the anoxic pond of hypoxia activity sludge, filling is flowed into after the anoxic bacteria in hypoxia activity sludge is to sewage denitrification denitrogenation processing There is the aerobic tank of aerobic activated sludge to nitrify.

In order to handle the reflux of organic matter containing nitre by sewage Microbial denitrogenation, preferred technology Scheme is that nitrification liquid return pipe 1.3.3 is installed between 1.3 top of anaerobic pond 1.1 and aerobic tank, on nitrification liquid return pipe 1.3.3 Reflux pump 1.3.4 is set；1.3 water part of aerobic tank enters in sedimentation basin 2, and sedimentation basin 2, part are drained into the form of excess sludge Sludge is back to anaerobic pond 1.1 in the form of sludge nitrification liquid, to nitrify denitrogenation, reduces the wasting of resources.

In order to keep wastewater treatment efficiency more preferable, dirt Organic substance in water in anaerobic pond beginning is dropped with microorganism in sludge Solution, preferred technical solution is that biological membrane cisterna 3 and anaerobic pond are equipped with the second mud return line 3.3 and sludge between 1.1 bottom Reflux pump 3.4；Second sludge return pipe, 3.3 other end is connected to biological membrane cisterna 3, and returned sludge is pumped by sludge reflux to detesting 1.1 beginning of oxygen pond, to the degradation of dirty Organic substance in water, anoxic pond 1.2 flows into sedimentation basin 2, the liquid of biological membrane cisterna 3 and activity Sludge reflux volume ratio is 1:(50%-100%), to denitrogenation processing.

In order to come into full contact with activated sludge with sewage, preferred technical solution is, The interior bottom of biological membrane cisterna 3 is equipped with the first aeration head 1.3.1 and the first aeration branch pipe 1.3.2, the interior bottom peace of aerobic tank 1.3 Equipped with the second aeration head 3.5 and the second aeration branch pipe 3.6, the second aeration head 3.5 divides the activated sludge in biological membrane cisterna 3 uniformly Cloth, the second sludge return pipe 3.3 takes extra activated sludge to anaerobic pond 1.1 away, to reach benign cycle, aerobic tank 1.3 are connected to the outer tip end of biological membrane cisterna 3 by aeration supervisor 3.7, aeration pump 3.8 are arranged on aeration supervisor 3.7, second exposes 3.5 to the first aeration head 1.3.1 of gas head is densely distributed, to realize high efficient aeration；When aerated conduit or aeration head break down, It needs to overhaul after sewage extraction in aerobic tank 1.3 and biological membrane cisterna 3, there is that maintenance is difficult to ask in actual moving process Topic.

Membrane suction pump 3.2, aeration pump 3.8 and sludge reflux pump 2.3 are electrically connected by conducting wire with photovoltaic storage battery respectively, light Overhead accumulator is electrically connected by conducting wire with solar energy power generating plate.

Anaerobic pond 1.1, anoxic pond 1.2, aerobic tank 1.3, sedimentation basin 2, biological membrane cisterna 3 and 4 inner wall of sterilization pool are equipped with anti-corrosion Layer, erosion resistant coating are epoxy resin composite material coating.

As shown in figure 3, water pump 3.9 is arranged in the water inlet inside biological membrane cisterna 3, the water inlet of water pump 3.9 connects biology Water inlet inside membrane cisterna 3, for the water outlet of water pump 3.9 towards 3 bottom of biological membrane cisterna, the second mud return line 3.3 is located at biology 3 bottom middle position of membrane cisterna.Water pump 3.9 gives the downward power of sewage, and the second aeration head 3.5 gives the upward power of sewage, makes biomembrane Drainage flow circulation is formed inside pond 3, sewage is directly directed to membrane module 3.1 and is filtered processing by the second aeration head 3.5, extra Activated sludge be discharged from the second mud return line 3.3, improve membrane module 3.1 to the speed of sewage water filtration, and then improve sewage Processing speed.

As shown in figure 4, the water outlet of water pump 3.9 is connect with the part that aeration supervisor 3.7 protrudes into biological membrane cisterna 3, membrane module 3.1 and second are arranged the first blender 5 between aeration head 3.5, and the second blender 6, the first blender are arranged above membrane module 3.1 5 and 6 direction of rotation of the second blender on the contrary, the blade of the first blender 5 and the second blender 6 towards the direction of membrane module 3.1 On be respectively provided with heating rod 7, brush 8 is arranged towards 3.1 direction of membrane module in heating rod 7, and gap is arranged in brush 8 and membrane module 3.1.When When biomembrane aging on membrane module 3.1 falls off, the biomembrane of aging is brushed off by brush 8, newborn biomembrane is made to start to give birth to Long, the first blender 5 gives sewage upwards thrust, and the second blender 6 gives sewage down thrust, keeps membrane module 3.1 and sewage abundant It contacts and sufficiently reacts, while the gaseous products moment generated on membrane module 3.1 being made to be blown away, increase membrane module 3.1 and oxygen The time of contact；Heating rod 7 makes about 3.1 temperature of membrane module reach the temperature of suitable biofilm development, to reduce sewage Handle the time.

Treatment method for rural sewage:

A) sewage is filtered by the water inlet of activated sludge tank 1；

B) the filtered sewage of activated sludge tank 1 enters sedimentation basin 2, and sewage passes through gravity precipitation solid particulate matter；

C) the filtered sewage of sedimentation basin 2 enters biological membrane cisterna 3, and sewage is by 3.1 mistake of membrane module in biological membrane cisterna 3 Filter；

D) sterilization pool 4 is discharged under the water outlet suction function of biological membrane cisterna 3 by the sewage that membrane module 3.1 filters to disappear Poison processing.

Sewage is entered by the water inlet of anaerobic pond 1.1, and sewage is by the anaerobic activated sludge filtering in anaerobic pond 1.1；

The sewage of prefiltration enters anoxic pond 1.2 in anaerobic pond 1.1, and sewage is dirty by the hypoxia activity in anoxic pond 1.2 Mud filtering；

The sewage filtered in anoxic pond 1.2 enters aerobic tank 1.3, and sewage is by the aerobic activated sludge in aerobic tank 1.3 Filtering.

E) sewage passes through the aeration of aeration pump 3.8 to outside in the gas that biological membrane cisterna 3 and aerobic tank 1.3 generate；

F) nitrification liquid on 1.3 top of aerobic tank flows back into anaerobic pond 1.1 by nitrification liquid return pipe 1.3.3；

G) sludge of 2 bottom of sedimentation basin flows back into 1.1 bottom of anaerobic pond by the first mud return line 2.2；

H) sludge of 3 bottom of biological membrane cisterna flows back into 1.1 bottom of anaerobic pond by the second mud return line 3.3.

Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or It changes among the protection scope created still in the utility model.

Claims (9)

1. rural domestic sewage treating device characterized by comprising pass through the activated sludge tank of pipeline successively sequential series (1), sedimentation basin (2), biological membrane cisterna (3) and sterilization pool (4)；

Filter screen (2.1) are set on the pipeline that sedimentation basin (2) is connect with biological membrane cisterna (3), the bottom of sedimentation basin (2) is equipped with and work Property sludge-tank (1) bottom connected the first mud return line (2.2), the first mud return line (2.2) close to sedimentation basin (2) one End setting sludge reflux pump (2.3)；

Membrane module (3.1) are set in biological membrane cisterna (3), the outlet pipe of membrane module (3.1) and biological membrane cisterna (3) is connected by pipeline It connects, membrane suction pump (3.2) is set between membrane module (3.1) and the outlet pipe of biological membrane cisterna (3)；

Shaker machine (4.1) are arranged in sterilization pool (4) middle position, and compound pump (4.2) are arranged in the water inlet of sterilization pool (4).

2. rural domestic sewage treating device according to claim 1, which is characterized in that activated sludge tank (1) is connected to The water inlet of sedimentation basin (2), the activated sludge tank (1) by anaerobic pond (1.1), anoxic pond (1.2) and aerobic tank (1.3) successively Sequential series connection forms, and the first mud return line (2.2) is connected to anaerobic pond (1.1) bottom.

3. rural domestic sewage treating device according to claim 2, which is characterized in that anaerobic pond (1.1), anoxic pond (1.2), in aerobic tank (1.3), the inlet and outlet that upper end, the lower end in each pond shift to install, previous pond goes out The mouth of a river is the water inlet in the latter pond；The inlet and outlet of sedimentation basin (2) are arranged at upper end.

4. rural domestic sewage treating device according to claim 2, which is characterized in that anaerobic pond is filled in (1.1) Anaerobic activated sludge is filled with hypoxia activity sludge in anoxic pond (1.2), and aerobic tank is filled with aerobic activated sludge in (1.3).

5. rural domestic sewage treating device according to claim 2, which is characterized in that anaerobic pond (1.1) and aerobic tank (1.3) nitrification liquid return pipe (1.3.3) is installed between top, reflux pump (1.3.4) is set on nitrification liquid return pipe (1.3.3).

6. rural domestic sewage treating device according to claim 4, which is characterized in that biological membrane cisterna (3) and anaerobic pond (1.1) the second mud return line (3.3) and sludge reflux pump (3.4) are installed between bottom.

7. rural domestic sewage treating device according to claim 6, which is characterized in that the interior bottom of biological membrane cisterna (3) First aeration head (1.3.1) and the first aeration branch pipe (1.3.2) are installed, the interior bottom of aerobic tank (1.3) is equipped with the second exposure The outer tip end of gas head (3.5) and the second aeration branch pipe (3.6), aerobic tank (1.3) and biological membrane cisterna (3) passes through aeration supervisor (3.7) it is connected to, aeration pump (3.8) is set on aeration supervisor (3.7).

8. rural domestic sewage treating device according to claim 7, which is characterized in that biological membrane cisterna (3) it is internal into Water pump (3.9) are set at the mouth of a river, the water inlet of water pump (3.9) water inlet internal towards biological membrane cisterna (3), water pump (3.9) For water outlet towards biological membrane cisterna (3) bottom, the second aeration head (3.5) is located at biological membrane cisterna (3) interior bottom close to its water outlet One end, membrane module (3.1) are located at the top of the second aeration head (3.5), and the second mud return line (3.3) is located at biological membrane cisterna (3) Bottom middle position.

9. rural domestic sewage treating device according to claim 8, which is characterized in that the water outlet of water pump (3.9) with Aeration supervisor (3.7) protrudes into the part connection of biological membrane cisterna (3), and the is arranged between membrane module (3.1) and the second aeration head (3.5) The second blender (6) are arranged in one blender (5), membrane module (3.1) top, and the first blender (5) and the second blender (6) rotate Contrary, the blades of the first blender (5) and the second blender (6) is towards being respectively provided with heating on the direction of membrane module (3.1) Brush (8) are arranged towards membrane module (3.1) direction in stick (7), heating rod (7), and gap is arranged in brush (8) and membrane module (3.1).