CN217377657U

CN217377657U - Rural sewage treatment system

Info

Publication number: CN217377657U
Application number: CN202221314916.0U
Authority: CN
Inventors: 陈云; 钱亮; 王涛; 万硕; 刘瑞东; 严浩; 祝天宇; 袁琳; 贺北平; 唐一
Original assignee: Thunip Holdings Co Ltd
Current assignee: Thunip Holdings Co Ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-09-06
Anticipated expiration: 2032-05-27

Abstract

The utility model relates to a rural sewage treatment technical field provides a rural sewage treatment system, include: the water distributor is communicated with the water inlet channel and is positioned at the bottom of the treatment tank, and a sludge zone, an anaerobic zone, an anoxic zone and an aerobic zone are formed in the treatment tank from bottom to top; the biomembrane reaction unit is positioned in the aerobic zone and the anoxic zone; the aerator is arranged between the anoxic zone and the aerobic zone. The utility model provides a rural sewage treatment system, for environment-friendly type, low-cost rural sewage treatment system, the water-locator is located the bottom of handling the pond so that sewage from following upward flow, and the processing to sewage is realized to the in-process that flows through mud district, anaerobic zone, anoxic zone and aerobic zone.

Description

Rural sewage treatment system

Technical Field

The utility model relates to a sewage treatment technical field especially relates to rural and village and town sewage treatment field, provides an environment-friendly, low-cost rural sewage treatment system.

Background

Rural domestic sewage treatment is important content of rural human environment improvement, water channel pipe network construction and rural sewage treatment are well done according to local conditions, and the method plays an important role in improving rural ecological environment, improving the quality of life of farmers and promoting agricultural rural modernization.

The rural sewage is mainly a mixture of domestic sewage and processing sewage which takes agricultural products as raw materials, basically does not contain heavy metals and toxic and harmful substances, contains a certain amount of nitrogen and phosphorus, and has better biodegradability. At present, various differences exist in the domestic sewage discharge modes of rural residents, some domestic sewage is discharged into open ditches or underground canals, some domestic sewage is discharged into streams, rivers and lakes nearby, other farmers collect excrement and the like as fertilizers, and the rest water is directly splashed to naturally evaporate or permeate into soil. In general, the domestic sewage discharge in rural areas becomes extremely dispersed due to the small distribution density of villages and the random arrangement of residents, and the unorganized discharged wastewater accounts for 61.85 percent of the total discharge amount.

The rural sewage treatment technology cannot be generalized, the actual conditions of the rural areas in different areas are greatly different, and the selection of some equipment deviates from the actual requirements of installation sites. In practical application, problems of wetland plant harvesting, substrate replacement and the like are also considered in ecological treatment technologies such as constructed wetland, land infiltration and the like, and some regions have blind pursuit of unpowered and zero operation cost but cannot completely achieve zero operation cost. Whether the technology is suitable for local actual conditions such as domestic sewage discharge and water quality characteristics, land resource occupation of treatment facilities and the like needs to be comprehensively considered, and the problem of rural domestic sewage treatment cannot be solved by the technology of moving hard sets.

For the treatment facilities which are already built, due to the lack of operation and maintenance cost, the sewage treatment facilities are gradually stopped, and the idle rate is high. In addition, due to the lack of maintenance of equipment, the sewage treatment effect is reduced, the problems of pipe network damage, corrosion of mechanical equipment, uncleaned sludge accumulation in structures, dirty site environment and the like of treatment facilities occur, the normal operation of the treatment facilities is seriously affected, the long-term operation of the treatment facilities cannot be realized, even the gradual stop of the operation of the facilities is caused, and secondary pollution to the environment is easily caused. The effluent quality of the sewage treatment facility is not regularly detected by professionals, and the treatment effect is difficult to evaluate.

Based on the above, compared with urban sewage, the rural sewage collection rate and treatment rate are generally low, the rural sewage treatment demand market is huge, the sewage distribution is uneven, the collection rate is low, the investment of a pipe network is large, and the rural domestic sewage treatment technology needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The present invention aims to solve at least one of the technical problems existing in the related art. Therefore, the utility model provides a rural sewage treatment system, water-locator are located the bottom of handling the pond so that sewage from down upwards flow, flow in-process through mud district, anaerobic zone, anoxic zone and aerobic zone, realize the processing to sewage.

According to the utility model discloses rural sewage treatment system, include:

the water distributor is communicated with the water inlet channel and is positioned at the bottom of the treatment tank, and a sludge zone, an anaerobic zone, an anoxic zone and an aerobic zone are formed in the treatment tank from bottom to top;

the biomembrane reaction unit is positioned in the aerobic zone and the anoxic zone;

the aerator is arranged between the anoxic zone and the aerobic zone.

According to the utility model discloses an embodiment, it separates the fender part to set up a plurality of longitudinal extension's curtain cloth in the processing pond, the curtain cloth separate the one end that keeps off the part connect in the pool wall of processing pond, the opposite side with be provided with the clearance between the pool wall of processing pond, so that it separates for the treatment area of a plurality of intercommunications along horizontal to handle the pond.

According to an embodiment of the utility model, set up in at least one the treatment zone the water-locator.

According to the utility model discloses an embodiment, be provided with in the treatment tank and nitrify the liquid back flow, nitrify liquid back flow intercommunication water outlet end the treatment area with intake the end the treatment area, nitrify the air outlet intercommunication of liquid back flow and air-blower, the air-blower is nitrified the liquid through the air-blowing drive and is flowed.

According to an embodiment of the present invention, the biofilm reaction unit comprises a filler and a flow guide, and the air of the aerator is adapted to drive the sewage to flow back longitudinally in the biofilm reaction unit.

According to an embodiment of the invention, the aerator is adapted for lifting adjustment.

According to the utility model discloses an embodiment, the treatment tank is provided with the sludge discharge pipe, the entrance point of sludge discharge pipe with mud district intercommunication, the exit end of sludge discharge pipe is provided with connects soon and inhales the mud mouth.

According to the utility model discloses an embodiment, the top in good oxygen district is formed with the clear water district, the clear water district is provided with the plant chinampa.

According to the utility model discloses an embodiment still includes charge device, charge device be suitable for to at least one in mud district, anaerobic zone, anoxic zone and the aerobic zone adds the medicine.

According to the utility model discloses an embodiment, at least one in the bottom of the pool and the pool wall of handling the pond sets up the geomembrane, the pool limit of handling the pond is provided with the rail.

The embodiment of the utility model provides an in above-mentioned one or more technical scheme, one of following technological effect has at least:

the utility model discloses rural sewage treatment system, the mud district in the treatment tank, anaerobic zone, anoxic zone and aerobic zone, the bottom of treatment tank sets up the water-locator, the water-locator sends pending sewage into the treatment tank through the outside of treatment tank, sewage in the treatment tank flows from making progress down, flow through anaerobic zone in proper order, anoxic zone and aerobic zone, set up the aerator between anoxic zone and aerobic zone, the aerator is used for supplying with the air to the aerobic zone, anoxic zone and aerobic zone set up biomembrane reaction unit, so that sewage flows in the longitudinal circulation in aerobic zone, sewage can fully react, promote treatment effeciency and treatment effect, be an environment-friendly type, low-cost rural sewage treatment system.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention or the related art, the drawings required to be used in the description of the embodiments or the related art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a rural sewage treatment system provided by the embodiment of the utility model;

fig. 2 is a schematic view of a top view structure of a rural sewage treatment system provided by the embodiment of the utility model.

Reference numerals:

1. a clear water zone; 2. an aerobic zone; 3. an anoxic zone; 4. an anaerobic zone; 5. a sludge zone; 6. the bottom of the pool; 7. a tank wall; 8. a liquid level; 9. a ground surface; 10. a surrounding rod; 11. a water inlet end; 12. a water outlet end;

21. a water distributor; 22. a biofilm reaction unit; 23. an aerator; 24. a plant floating island; 25. a cord fabric barrier member;

30. an aeration gas distribution pipe; 31. a sludge discharge pipe; 32. a nitrifying liquid return pipe; 33. a dephosphorization dosing port; 34. a disinfectant adding port.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, the terms "plurality", and "plural" mean two or more unless otherwise specified.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present specification, references to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the related technology, the rural sewage treatment focuses more on the treatment combining with ecology, and adopts the comprehensive technology of 'biological + ecological' combined sewage treatment such as an anaerobic methane tank treatment technology, a stabilization pond treatment technology, an artificial wetland treatment technology, a soil infiltration treatment system, a farmland water-withdrawal emission-reduction technology, a biomembrane method sewage treatment technology and the like, but still provides a technology suitable for rural domestic sewage treatment.

The embodiment of the utility model, combine figure 1 and figure 2 to show, provide a rural sewage treatment system, include: a water distributor 21, a biological membrane reaction unit 22 and an aerator 23 which are arranged in the treatment tank, wherein a sludge zone 5, an anaerobic zone 4, an anoxic zone 3 and an aerobic zone 2 are formed in the treatment tank from bottom to top; the water distributor 21 is communicated with the water inlet channel, the water distributor 21 is positioned at the bottom of the treatment tank, and the biomembrane reaction unit 22 is positioned in the aerobic zone 2 and the anoxic zone 3; the aerator 23 is arranged between the anoxic zone 3 and the aerobic zone 2.

The treatment tank can utilize a waste pool or a pool dug on site. The treatment tank is provided with a sludge zone 5, an anaerobic zone 4, an anoxic zone 3 and an aerobic zone 2 from bottom to top, sewage to be treated is introduced into the water distributor 21 through the water inlet channel, the sewage to be treated is sent to the bottom of the treatment tank through the water distributor 21, the sewage to be treated is distributed at the bottom of the treatment tank as uniformly as possible through the water distributor 21, and the sewage to be treated is sent to the sludge zone 5 through the water distributor 21. The water distributor 21 is positioned in the sludge zone 5, and the outlet of the water distributor 21 faces upward, namely faces the anaerobic zone 4, so that the sewage to be treated sequentially passes through the anaerobic zone 4, the anoxic zone 3 and the aerobic zone 2, and is treated step by step. Wherein, the water inlet end 11 of the treatment tank enters the water distributor 21 through a water inlet pipeline, and the water outlet end 12 of the treatment tank discharges the treated water reaching the standard, and the treated water enters a subsequent treatment system or is directly discharged. The sewage to be treated may fall by gravity into the water distributor 21 or may be pumped into the water distributor 21.

The water distributor 21 can realize multi-point upward flow distribution, which is equivalent to arranging a plurality of anaerobic zones 4 (and can be understood as a settling zone), anoxic zones 3 and aerobic zones 2 in series in a vertical manner, and the above zones can be understood as processing units with different functions. The inlet water sequentially passes through the anaerobic (sedimentation) zone and the anoxic zone 3 upwards, is converged into the anoxic and aerobic alternate zone, and is finally discharged out of the ecological reaction tank. The sludge zone 5 is a sludge anaerobic nitrification and storage zone, sewage is subjected to anaerobic degradation in the anaerobic zone 4, the anoxic zone 3 is subjected to denitrification, and the aerobic zone 2 is subjected to organic matter aerobic degradation, nitrification and other processes.

The water flow enters the anaerobic zone 4 (settling zone) upwards at a constant speed to complete the settling of large-particle precipitable suspended matters and the partial degradation of soluble organic matters. Sewage enters the anoxic zone 3 and the aerobic zone 2 after passing through the anaerobic zone 4, and the water flow direction becomes horizontal through the cooperation of the biomembrane reaction unit 22 and the aerator 23, so that the water flow can flow back, and the denitrification effect is improved remarkably by constructing an anoxic environment and an aerobic environment in the vertical direction and the horizontal direction.

The environment-friendly and low-cost rural sewage treatment system provided by the embodiment breaks through the limitation of a square reinforced concrete structure of the traditional process unit, realizes three-dimensional arrangement of biochemical treatment, advanced treatment, sludge treatment and other links through ingenious design, is integrated in one process unit, and realizes the great reduction of investment and operation cost. Meanwhile, the rural sewage treatment system is not limited by landform, can utilize waste ponds, and can be rectangular, circular, triangular or irregular in planar arrangement.

The treatment tank in the present embodiment is not limited to the pit described above, and may be a tank constructed by a reinforced concrete structure, and of course, a tank having another structure may be used.

On the basis of the above embodiment, referring to fig. 1, a clear water zone 1 is formed above the aerobic zone 2, a plant floating island 24 is provided in the clear water zone 1, and the plant floating island 24 floats on the liquid surface 8 of the treatment tank. The plant floating island 24 has landscape effect and air purification effect, and simultaneously selects developed plants with developed root systems to improve the water quality of the upper clear water area 1.

Of course, the treated sewage treated by the aerobic zone 2 can be discharged through the water outlet end 12 for further treatment, i.e. the clear water zone 1 is not limited to be formed above the aerobic zone 2, the plant floating island 24 is not limited to be arranged on the clear water zone 1, and for example, the upper part of the aerobic zone 2 can also be a closed structure.

In some embodiments, referring to fig. 2, a plurality of longitudinally extending curtain baffle members 25 are provided in the treatment tank, one end of the curtain baffle members 25 being connected to the tank wall 7 of the treatment tank, and the other side being spaced from the tank wall 7 of the treatment tank, so that the treatment tank is divided into a plurality of communicating treatment zones in the transverse direction. The curtain cloth separates and keeps off part 25 and separates the processing pond for a plurality of treatment areas in horizontal (horizontal direction), every treatment area all includes from the mud district 5 that upwards forms down, anaerobic zone 4, anoxic zone 3 and aerobic zone 2 (the top in aerobic zone 2 can be provided with clear water district 1), curtain cloth separates and keeps off part 25 and carries out the physics and separates, make the sewage of being handled can carry out multiple treatment through multistage treatment area, and separate through curtain cloth and keep off the flow path of the sewage of 25 restriction of part of 25 being handled, make the sewage of being handled can pass through every corner of entire system, do not take place the short-flow phenomenon.

Referring to fig. 2, the influent water enters the ecological reaction tank through the water distributor 21 by adopting multiple points of diffusion, the curtain cloth baffle part 25 separates the treatment tank into at least two separate treatment areas, and the water distribution point is positioned above the sludge stabilizing storage area. The front side of the first curtain cloth baffle component 25 is connected with the tank wall 7 of the treatment tank, a gap is arranged between the rear side and the tank wall 7 of the treatment tank, a gap is arranged between the front side of the second curtain cloth baffle component 25 and the tank wall 7 of the treatment tank, the rear side is connected with the tank wall 7 of the treatment tank, the front side of the third curtain cloth baffle component 25 is connected with the tank wall 7 of the treatment tank, a gap is arranged between the rear side and the tank wall 7 of the treatment tank, and so on, the curtain cloth baffle component 25 enables the treated sewage in the treatment tank to flow along the S-shaped curved path, and in a limited space, the flow path of the treated sewage can be prolonged, the short flow of the sewage is avoided, and the treatment effect is improved.

The curtain cloth baffle component 25 is made of soft materials, can play a role in baffle, and is simple and convenient to install and low in cost. The curtain spacer 25 may be a waterproof member such as a geomembrane to ensure that the treated sewage enters the next treatment zone from the gap. Of course, the curtain cloth baffle component 25 can also adopt a water permeable component, and the curtain cloth baffle component 25 plays a certain baffle role, so that most of the treated sewage enters the next treatment area from the gap.

In some embodiments, a water distributor 21 is arranged in at least one treatment area, and a water distributor 21 is arranged in one or more treatment areas, so that treated sewage can enter the treatment tank through a plurality of areas, and the treated sewage is uniformly distributed, and the uniformity of treatment effect is ensured.

It is understood that the water distributor 21 is disposed in a partial area in the treatment tank, not all areas are used for water inflow, and further optimization treatment is performed downstream of the area where the water distributor 21 is disposed, for example, a treatment area without the water distributor 21 is disposed as a treatment area having a sterilization function. Or that no water distributor 21 is provided in at least one of the treatment zones.

When only one treatment area is arranged in the treatment tank, the water distributor 21 can be arranged at the local part of the treatment area, the water distributor 21 is not arranged at the bottom of at least part of the treatment area, the water distributor 21 supplies water into the treatment area from bottom to top, and in the anoxic area 3 and the aerobic area 2 of the treatment area, the treated sewage flows towards the direction of the water outlet end 12 along the transverse direction (horizontal direction), so that the space in the treatment tank can be partitioned according to the function.

In some embodiments, a nitrifying liquid return pipe 32 is disposed in the treatment tank, the nitrifying liquid return pipe 32 connects the treatment area at the water outlet end with the treatment area at the water inlet end, and the nitrifying liquid return pipe 32 is used for continuously conveying nitrifying liquid from the water outlet end of the treatment system to the water inlet end 11, so as to enhance the denitrification effect of the system.

The nitrifying liquid return pipe 32 is communicated with an air outlet of the blower, and an air source provided by the blower is used as the power for the flowing of the nitrifying liquid, so that the blower drives the nitrifying liquid to flow back to the inlet end by air blowing, namely, the nitrifying liquid flows back to the inlet end of the treatment tank by utilizing the principle of air stripping backflow, the operation is simple,

the air blower can also be used for air supply of the aerator 23 and the biological film reaction unit 22, the aerator 23 is communicated with an air outlet of the air blower through the aeration air distribution pipe 30, the biological film reaction unit 22 is communicated with the air outlet of the air blower through the aeration air distribution pipe 30, and the air blower is multifunctional. In this case, the whole rural sewage treatment system only needs one blower to supply air, and the other devices do not have any mechanical movable parts, so that the rural sewage treatment system is suitable for sewage treatment requirements of various scales in rural areas. When the blower is set to continuously supply air for 24 hours, the system can realize unmanned operation.

In some embodiments, the biofilm reaction unit 22 comprises a filler and a flow guide member, and the air of the aerator 23 is suitable for driving the sewage to longitudinally flow back in the biofilm reaction unit 22, so as to ensure the fluidity of the treated sewage in the aerobic zone 2, and further improve the sewage treatment efficiency and effect.

Referring to fig. 1, the hollow arrows surrounding the biofilm reaction unit 22 indicate the flow path of the sewage flowing back longitudinally around the biofilm reaction unit 22, and the sewage flowing back longitudinally is realized through the filler, the diversion member and the aerodynamic force.

The biofilm reaction unit 22 can be an integrated air-lift circulation biofilm reaction unit, can realize self-floating, is internally provided with fixed combined biological fillers and flow guide facilities, realizes longitudinal backflow in the reaction unit under the action of aeration, and has a biological deodorization function. When the aerator 23 is communicated with the aeration air distribution pipe 30, the integrated air-lift circulation biomembrane reaction unit is also fixed on the aeration air distribution pipe 30, and the aeration air distribution pipe 30 supplies air power to the biomembrane reaction unit 22.

In some embodiments, the aerator 23 is adapted to be adjusted up and down (not shown), and the aerator 23 is positioned intermediate the aerobic zone 2 and the anoxic zone 3 to provide oxygen to the aerobic microorganisms in the water.

The height of the aerator 23 can be adjusted according to various conditions such as the flow rate of the sewage to be treated, the treatment process, etc., so as to ensure that the aerator 23 supplies air to the aerobic zone 2. The aerator 23 can be adjusted by lifting with a pull rope or by a lifting mechanism, for example, the aerator 23 is lifted by a winch, and the aerator 23 can be lifted in various ways, which is not limited herein.

In some embodiments, the rural sewage treatment system further comprises a dosing device adapted to dose at least one of the sludge zone 5, the anaerobic zone 4, the anoxic zone 3 and the aerobic zone 2. The dosing device is provided with a dosing pipe which is provided with dosing ports of different medicines corresponding to different treatment areas so as to send the medicines into the different treatment areas to treat the treated sewage.

Referring to fig. 2, the dosing device includes a phosphorus removal dosing port 33, which can be connected to a phosphorus removal dosing system, where phosphorus removal agents such as aluminum chloride (PAC) are added if the system has a high phosphorus removal requirement. The dosing device comprises a disinfectant dosing port 34, and if the system discharges water with the requirement of escherichia coli, the dosing device is externally connected with a disinfectant dosing system and adds disinfectant into the water.

In some embodiments, referring to fig. 2, the treatment tank is provided with a sludge discharge pipe 31, the inlet end of the sludge discharge pipe 31 is communicated with the sludge area 5, and excess sludge can be sucked away and transported by using a sludge suction truck periodically, so that the sludge is discharged in time, and the sludge accumulation is prevented from affecting the sewage treatment effect.

The outlet end of the sludge discharge pipe 31 is provided with a quick-joint sludge suction port, so that the sludge discharge pipe 31 is conveniently and quickly butted with a sludge suction truck, the operation is simple and convenient, and the cost is low.

In some embodiments, at least one of the bottom 6 and the wall 7 of the treatment tank is provided with a geomembrane, and at least one of the bottom 6 and the wall 7 adopts a geomembrane anti-seepage design, so that the cost of the traditional reinforced concrete tank is saved, the cost is reduced, the construction is convenient, the construction difficulty is low, and the construction efficiency of the treatment tank can be improved.

The tank edge of the treatment tank is provided with a fence, so that people are prevented from turning into the tank, and the safety is ensured. The rail can be the view railing, can guarantee safely can also guarantee beautifully. The ground 9 around the treatment tank can be designed to be green, so as to further improve the aesthetic degree and realize the ingenious combination of sewage treatment, sludge stabilization, no odor and landscaping.

The rural sewage treatment system shown in fig. 1 and 2 will be described in detail below.

Rural sewage raw water from the pipe network enters the water distributor 21 from the water inlet end 11 through the water inlet pipe network and then enters the buffer zone of the sludge zone 5 through the water distributor 21, and non-soluble organic matters and activated sludge in the raw water are adsorbed in the sludge buffer zone. The sewage passes through the anaerobic zone 4, the anoxic zone 3, the aerobic zone 2 and the clear water zone 1 from bottom to top, and finally the purpose of purification is achieved. The water distributor 21 is arranged in the front three lattices close to the water inlet end 11, water flow is not only from bottom to top, but also physically separated by the horizontally arranged curtain cloth baffle component 25, so that the water flow can pass through each corner of the whole system without short flow.

The rural sewage treatment system is provided with a nitrifying liquid return pipe 32, an air blower is used as an air source to carry out air stripping backflow, nitrifying liquid is continuously conveyed to a water inlet end 11 from a water outlet end of the rural sewage treatment system, and the denitrification effect of the system is enhanced.

The biological film reaction unit 22 floats in the anoxic zone 3 and the aerobic zone 2, a fixed combined biological filler and a flow guide piece are arranged in the biological film reaction unit 22, longitudinal backflow is realized in the biological film reaction unit 22 under the action of air provided by a liftable aerator 23, and the biological film reaction unit 22 has a biological deodorization function under the action of the filler.

The floating island 24 is full of plants on the water surface, so that the air purification and artificial landscaping functions are realized, and meanwhile, the developed plants with developed root systems are selected, so that the water quality of the upper clear water area 1 is improved.

The rural sewage treatment system is provided with a phosphorus removal dosing port 33 and a disinfectant dosing port 34, and a phosphorus removal medicament or a disinfectant is added into water. Finally, the purified water flows out from the water outlet end 12 and enters a subsequent treatment system or directly reaches the standard and is discharged outside.

In the aspect of sludge disposal, a sludge discharge pipe 31 provided with a quick-connection sludge suction port is arranged, and excess sludge is periodically sucked away and transported by a sludge suction truck.

Based on the above, the rural sewage treatment system of this embodiment has realized through multiple biochemical and physicochemical processes such as anaerobism, oxygen deficiency, good oxygen, absorption, deposit, oxidation, blow off: degrading and removing organic pollutants, nitrogen and phosphorus nutrient elements; reduction and stabilization of sludge; pathogenic bacteria and viruses are removed; the landscape is formed by the perfect combination of natural purification and artificial purification, is an environment-friendly and low-cost rural sewage treatment system, and is suitable for rural and rural sewage.

The rural sewage treatment system of this embodiment, it is low to the construction land requirement, not influenced by topography and landform, the small investment. The sewage treatment system can be constructed on urban scattered open lands by utilizing flat lands and sloping lands, waste or old pits, ponds, ditches and sloping lands, can be flexibly and dispersedly arranged according to actual conditions, realizes the on-site sewage treatment, does not need large-volume reinforced concrete water treatment structures and larger equipment installation capacity, can be in a rectangular, circular, triangular or irregular shape in planar arrangement, and has great implementation flexibility. The operation is simple, the whole system only needs one blower to continuously supply air for 24 hours, other blowers do not have any mechanical movable parts, the system can realize unmanned operation, and the system is suitable for sewage treatment requirements of various scales in rural areas. Compared with the traditional rural sewage, the method can save 50-80% of the investment of sewage plant pipe networks. The sludge yield is little, the sludge is inorganic and stable, the sludge yield is saved by 70 percent compared with the activated sludge method, the secondary pollution generated in the sludge treatment process of the traditional rural sewage treatment station is reduced, and the method is more energy-saving and environment-friendly.

The bottom layer is a sludge natural digestion treatment area, the clear water area 1 at the upper part of the tank body is used as a sealing layer of a sewage area and a sludge area at the bottom, the biomembrane reaction unit 22 has a deodorization function, and simultaneously, odor generated by the system is eliminated by utilizing the plant root system adsorption and green planting purification of the plant floating island 24. COD removal rate in the anaerobic stage is 40-60%, the plant floating island is subjected to natural purification, and a carbon source generated in the sludge stabilization process supplements a carbon source required for denitrification without an additional carbon source.

The rural sewage treatment system can create rural ecological living environment and plant flowers and plants in a clear water area, so that the system becomes a waterscape landscape, and not only can create ecological landscape and improve living environment, but also can be integrated into peripheral greening to increase the value of peripheral land.

Most organic pollutants and excess sludge in the sewage are treated and removed in an anaerobic environment through the anaerobic zone 4 and the sludge zone 5 of the system, the treatment process is short, a deodorization system is not needed, and the sludge is reduced, so that the comprehensive energy consumption of the process is about 40 percent lower than that of the traditional process.

The key equipment of the whole rural sewage treatment system is designed in a modularized way, and the treatment scale is from 10m ³ D to 1000m ³ The range of/d can be customized according to the scale. The effluent standard can reach the sewage discharge of rural and township areas all over the countryThe effluent quality is kept equal to the first-class A standard of GB 18918 + 2002 discharge Standard of pollutants for municipal wastewater treatment plants.

The above embodiments are merely illustrative, and not restrictive, of the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. A rural sewage treatment system is characterized by comprising:

the aerator is arranged between the anoxic zone and the aerobic zone.

2. The rural sewage treatment system of claim 1, wherein a plurality of longitudinally extending curtain baffle members are arranged in the treatment tank, one end of each curtain baffle member is connected to the wall of the treatment tank, and a gap is arranged between the other side of each curtain baffle member and the wall of the treatment tank, so that the treatment tank is divided into a plurality of communicated treatment areas along the transverse direction.

3. The rural sewage treatment system of claim 2, wherein the water distributor is disposed in at least one of the treatment zones.

4. The rural sewage treatment system of claim 2, wherein a nitrifying liquid return pipe is arranged in the treatment tank, the nitrifying liquid return pipe is communicated with the treatment area at the water outlet end and the treatment area at the water inlet end, the nitrifying liquid return pipe is communicated with an air outlet of an air blower, and the air blower is suitable for driving nitrifying liquid to flow through air blowing.

5. The rural sewage treatment system of claim 1, wherein the biofilm reaction unit comprises a filler and a flow guide, and the air of the aerator is suitable for driving the sewage to flow back longitudinally in the biofilm reaction unit.

6. The rural sewage treatment system of claim 1, wherein the aerator is adapted to be adjusted up and down.

7. The rural sewage treatment system of claim 1, wherein the treatment tank is provided with a sludge discharge pipe, the inlet end of the sludge discharge pipe is communicated with the sludge area, and the outlet end of the sludge discharge pipe is provided with a quick-connection sludge suction port.

8. The rural sewage treatment system of claim 1, wherein a clear water zone is formed above the aerobic zone, and the clear water zone is provided with a plant floating island.

9. The rural sewage treatment system of claim 1, further comprising a dosing device adapted to dose at least one of the sludge zone, anaerobic zone, anoxic zone, and aerobic zone.

10. The rural sewage treatment system of claim 1, wherein at least one of the bottom and the wall of the treatment tank is provided with a geomembrane, and the edge of the treatment tank is provided with a fence.