CN111302494A

CN111302494A - Deep bed multiplication MBBR reactor for town sewage treatment

Info

Publication number: CN111302494A
Application number: CN202010205497.6A
Authority: CN
Inventors: 涂育伟; 胡飞; 程霞风
Original assignee: Anhui Zhongyuan Jintian Environmental Science And Technology Co ltd
Current assignee: Anhui Zhongyuan Jintian Environmental Science And Technology Co ltd
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2020-06-19

Abstract

The invention discloses a deep bed multiplication MBBR (moving bed biofilm reactor) for urban sewage treatment, which comprises a regulating tank, an anaerobic tank, an anoxic tank and a first aerobic tank which are sequentially arranged, and further comprises a second aerobic tank which is arranged on one side of the regulating tank, the anaerobic tank, the anoxic tank and the first aerobic tank and is respectively communicated with the regulating tank, the anoxic tank and the first aerobic tank, wherein an inclined tube sedimentation tank, a filter tank and a sludge tank are arranged on the other side of the second aerobic tank, and the inclined tube sedimentation tank is positioned between the filter tank and the sludge tank; the invention combines the labyrinth structure design, organically combines the regulating tank, the anaerobic tank, the anoxic tank, the first aerobic tank, the second aerobic tank, the inclined tube sedimentation tank, the filter tank and the like together, highlights the integrity and the harmony of the process, saves the occupied area for sewage station construction and the process pipeline installation engineering amount, and saves the investment cost.

Description

Deep bed multiplication MBBR reactor for town sewage treatment

Technical Field

The invention belongs to the field of sewage treatment, and particularly relates to a deep bed multiplication MBBR (moving bed biofilm reactor) for urban sewage treatment.

Background

According to the statistics of the research institute E20, the treatment rate of the sewage in cities, counties and cities at present exceeds 90%, but the treatment rate of the sewage in the constructed towns is only 30%, the treatment rate of the sewage in the villages is less than 20%, and the future main battlefield of sewage treatment is transferred from the cities to the towns. In recent years, the national rural sewage treatment market is expected to be released successively, and the total investment amount from construction and operation reaches 1400 billion yuan.

Due to factors of regional dispersion, large population density and the like, sewage of over 1 hundred million households in China is not effectively treated. In media investigation, the embarrassing reality of 'sunning' still commonly exists in rural sewage treatment equipment in part of areas: the phenomena of 'getting up and not getting up' or 'getting up and not getting up' are very common. At present, urban sewage treatment plants have the condition of 'construction but unavailable', and the reason is related to mismatching of drainage pipe network acceleration and treatment capacity acceleration. And the total investment of rural sewage treatment plants built in some places exceeds one hundred million yuan, and the rural sewage treatment plants are either overdue seriously or are left unused for a long time after being built.

And due to the supporting tendency of a financial subsidy mechanism, the scale of certain urban and town sewage treatment projects is deliberately enlarged, so that the operation cost of the project is increased after the project is built, the project becomes unbearable pain for local finance and carriers, and the project is finally aired aside. The lack of a commercial model for tailoring clothes is also one of the development stops for rural sewage treatment in the view of environmental protection people. At present, as the management and responsibility main body of rural sewage treatment is not yet determined in the top-level design, a plurality of short boards to be compensated exist in various places in the aspects of charging modes, taking over responsibility and the like.

By combining the current situation analysis, urban sewage treatment, and selection of sewage plants and treatment devices should be made according to local conditions, and the selection is the best one. Therefore, it is very important to explore the urban domestic sewage treatment technology and treatment mode which have low cost, high technology and foolproof management and are suitable for the actual conditions of all areas.

Disclosure of Invention

The invention aims to provide a deep bed multiplication MBBR reactor for town sewage treatment, which is optimized and improved on the basis of the traditional A2O process, integrates the characteristics of town sewage and the level and cost characteristics of a sewage treatment technology, and has the advantages of small occupied area, low construction cost, small equipment usage amount and simple automatic control.

The deep bed multiplication MBBR reactor for town sewage treatment comprises a regulating tank, an anaerobic tank, an anoxic tank and a first aerobic tank which are sequentially arranged, and further comprises a second aerobic tank which is arranged on one side of the regulating tank, the anaerobic tank, the anoxic tank and the first aerobic tank and is respectively communicated with the regulating tank, the anoxic tank and the first aerobic tank, wherein an inclined tube sedimentation tank, a filter tank and a sludge tank are arranged on the other side of the second aerobic tank, and the inclined tube sedimentation tank is positioned between the filter tank and the sludge tank.

Preferably, the adjusting tank is connected with a lifting pump for lifting sewage at the bottom of the adjusting tank into the anaerobic tank, the second aerobic tank is connected with a nitrifying liquid reflux device for respectively refluxing nitrifying liquid into the adjusting tank and the anoxic tank, and the inclined tube sedimentation tank is connected with a sludge reflux device for returning sludge into the anaerobic tank.

Preferably, nitrify liquid reflux unit and sludge reflux unit and be the air stripping device, the air stripping device includes a separator box, be connected with the backward flow on the separator box and advance pipe, backward flow exit tube and air hose, backward flow advances pipe one end and separator box intercommunication, and the backward flow thing pond is treated in the other end intercommunication, backward flow exit tube one end extends to the separator box bottom, other end intercommunication backward flow thing return current channel, the air hose diameter is less than backward flow exit tube diameter and one end extends to the separator box bottom and cup joints in the backward flow is intraductal, and the other end is located the separator box outside and is connected with the return air fan, be connected with the PLC controller on the return air fan, PLC controller control return air fan operating time.

Preferably, the oxygen-poor pool, the first aerobic pool and the second aerobic pool are uniformly provided with aeration hoses and oxygen dissolving instruments, the aeration hoses in the oxygen-poor pool, the first aerobic pool and the second aerobic pool are respectively provided with an aeration valve, the aeration valves are connected with aeration fans, the oxygen dissolving instruments are connected with a PLC (programmable logic controller), and the aeration fans and the aeration valves are controlled by the PLC.

Preferably, backwashing systems are arranged at the bottoms of the inclined tube sedimentation tank and the filter tank, and each backwashing system comprises a gas washing device arranged at the bottoms of the inclined tube sedimentation tank and the filter tank and a water washing device independently arranged at the bottom of the filter tank;

the gas washing device comprises a backwashing fan and backwashing gas pipes which are uniformly distributed at the bottom of the inclined tube sedimentation tank and the filter tank, backwashing gas valves are respectively arranged on the backwashing gas pipes in the inclined tube sedimentation tank and the filter tank, and the backwashing gas valves are connected with the backwashing fan;

the washing device comprises a backwashing water pipe arranged in the filter tank, a backwashing pump is connected to the backwashing water pipe, and the backwashing pump, a backwashing air valve and a backwashing fan are controlled by a PLC (programmable logic controller).

Preferably, the backwashing pump is communicated with a water outlet of the filter tank.

Preferably, the first aerobic tank and the second aerobic tank are filled with column type MBBR filling materials, and the height of the column type MBBR filling materials is adapted to the depth of the first aerobic tank and the second aerobic tank.

The deep bed multiplication MBBR reactor for town sewage treatment has the beneficial effects that:

1. the adjusting tank, the anaerobic tank, the anoxic tank, the first aerobic tank, the second aerobic tank, the inclined tube sedimentation tank, the filter tank and the like are organically combined together by combining the labyrinth structure design, the integrity and the harmony of the process are highlighted, meanwhile, the occupied area for sewage station construction and the process pipeline installation engineering amount are saved, and the investment cost is saved.

2. The aerobic tank is divided into a first aerobic tank and a second aerobic tank, on one hand, because the nitrification reaction in the aerobic tank is slow, and the retention time of sewage in the aerobic tank is long, the whole capacity of the aerobic tank needs to be increased. On the other hand, the speed and the time of the sewage entering the second aerobic tank from the first aerobic tank can be conveniently controlled, the retention time of the sewage in the aerobic tank is prolonged, and the complete nitration reaction is ensured.

3. Nitrified water backflow and sludge backflow are achieved by means of the nitrified liquid backflow device and the sludge backflow device, namely backflow is achieved by means of the gas stripping device, the number of devices such as a pump body and other operation parts is reduced, the failure rate of the whole device is reduced, and the maintenance cost is reduced.

4. Nitrifying liquid in the second aerobic tank flows back to the regulating tank, and the sewage in the regulating tank is diluted, so that redundant oxygen in the regulating tank is consumed firstly, and then the sewage enters the anaerobic tank, and the abnormal sludge bulking phenomenon is reduced. High-power return nitrifying liquid in the second aerobic tank circularly enters the anoxic tank, and anoxic nitrifying bacteria finish the removal of total nitrogen.

5. Utilize dissolved oxygen appearance survey first good oxygen pond, second good oxygen pond and anaerobism pond internal oxygen content to give the PLC controller with the signal transmission, utilize the aeration fan of PLC controller automatic control to the aeration in first good oxygen pond, second good oxygen pond and the anaerobism pond, realize automatic aeration control, and the oxygen content in first good oxygen pond, second good oxygen pond and the anaerobism pond of control that can be accurate.

6. The backwashing system is utilized to realize regular washing in the inclined tube sedimentation tank and the filter tank, and the phenomena of inclined tube filling in the inclined tube sedimentation tank and blocking in the filter tank are avoided.

7. Column type MBBR (moving bed biofilm reactor) fillers are adopted in the first aerobic tank and the second aerobic tank to form a local A2O process, and an integral multi-gradient A2O process is constructed in the integral sewage treatment equipment, so that pollutants can be removed efficiently with low consumption, energy is saved, and consumption is reduced.

Drawings

FIG. 1 is a plan layout view of a deep bed multiplication MBBR reactor for town sewage treatment according to the technical scheme of the invention,

FIG. 2 is a schematic diagram of the aeration structure of the deep bed multiplication MBBR reactor for town sewage treatment according to the technical scheme of the invention,

FIG. 3 is a schematic diagram of a backwashing system of a deep bed multiplication MBBR reactor for town sewage treatment according to the technical scheme of the invention,

FIG. 4 is a schematic diagram of a gas stripping reflux structure of a deep bed multiplication MBBR reactor for town sewage treatment according to the technical scheme of the invention,

FIG. 5 is a process flow chart of the deep bed multiplication MBBR reactor for town sewage treatment according to the technical scheme of the invention.

Detailed Description

In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will now be further described with reference to the drawings attached to the specification.

As shown in fig. 1, the deep bed multiplication MBBR reactor for town sewage treatment according to the technical scheme of the present invention comprises a regulating tank 1, an anaerobic tank 2, an anoxic tank 3, a first aerobic tank 4, and a second aerobic tank 5, which are arranged in sequence on one side of the regulating tank 1, the anaerobic tank 2, the anoxic tank 3, and the first aerobic tank 4, and are respectively communicated with the regulating tank 1, the anoxic tank 2, and the first aerobic tank 3. The other side of the second aerobic tank 5 is provided with an inclined tube sedimentation tank 6, a filter tank 7 and a sludge tank 8, and the inclined tube sedimentation tank 6 is positioned between the filter tank 7 and the sludge tank 8.

In the technical scheme, during sewage treatment, sewage sequentially enters the regulating tank 1, the anaerobic tank 2, the anoxic tank 3, the first aerobic tank 4, the second aerobic tank 5, the inclined tube sedimentation tank 6 and the filter tank 7. In the anaerobic tank 2, the organophosphorus releases phosphorus under the anaerobic condition of the phosphorus-accumulating bacteria, so that the organophosphorus is removed. Then the sewage continues to move forward and enters the anoxic tank 3, denitrification reaction is carried out in the anoxic tank 3, namely, nitrite and nitrate are reduced into nitrogen by denitrifying bacteria under the anoxic condition and then the nitrogen escapes from the sewage, thereby achieving the aim of removing nitrogen. Then the sewage continuously moves forward and enters the first aerobic tank 4, and the nitrification reaction is carried out in the first aerobic tank 4, namely, under the aerobic condition, the ammonia nitrogen is oxidized into nitrite and nitrate by nitrifying bacteria.

Among the above-mentioned technical scheme, according to A2O sewage treatment process, with equalizing basin 1, anaerobism pond 2, oxygen deficiency pond 3, first good oxygen pond 4, second good oxygen pond 5, pipe chute sedimentation tank 6, filtering pond 7 and sludge impoundment 8 according to labyrinth structural design, combine each reaction tank organic together, have cooperativity, the area of saving dirty processing station that can be fine, can save each pipeline quantity and length more, simplify the pipeline and arrange, reduce the engineering degree of difficulty, reduce the engineering volume, practice thrift construction cost and maintenance cost.

In the technical scheme, according to the A2O process with normal water quality, the general sewage needs to be subjected to anaerobic treatment for 1.5 hours, anoxic treatment for 2.5 hours and aerobic treatment for 6.5 hours, and in order to ensure that the sewage stays in the aerobic treatment for enough time, the aerobic zones in the scheme are respectively provided with the first aerobic tank 4 and the second aerobic tank 5. On one hand, because the nitrification reaction in the aerobic tank is slow, the retention time of the sewage in the aerobic tank is long, and the whole capacity of the aerobic tank needs to be increased. On the other hand, the speed and the time of the sewage entering the second aerobic tank from the first aerobic tank can be conveniently controlled, the retention time of the sewage in the aerobic tank is prolonged, and the complete nitration reaction is ensured.

The deep bed multiplication MBBR reactor for town sewage treatment of the technical scheme effectively solves the problem of high construction cost of town sewage treatment stations in the prior art. The phenomena of 'getting up and not getting up' or 'getting up and not getting up' of the town sewage treatment station are changed. The problem that subsequent use and maintenance cost cannot be borne due to the fact that the quantity of the urban sewage treatment stations is inconsistent with the actual demand is solved. The problem that the town sewage treatment in the prior art can not be automated or the automation process is too complex and difficult to manage is solved. Is a sewage treatment system which is specially established aiming at the characteristics of urban sewage and sewage treatment capacity.

Referring to fig. 1, a solid arrow (→) indicates a sewage flow direction, a hollow arrow indicates a sewage backflow direction, and the sewage backflow direction is seen to flow back from the second aerobic tank 5 to the anoxic tank 3 and the regulation tank 1, respectively. The sewage return direction is also visible in fig. 5. Nitrifying liquid in the second aerobic tank 5 flows back to the regulating tank 1, and is rapidly mixed with the original sewage in the regulating tank 1, oxygen in the original sewage is consumed by using ammonia nitrogen salt in the nitrifying liquid, and the ammonia nitrogen salt in the nitrifying liquid is oxidized to generate nitrogen to overflow, so that the ammonia nitrogen salt is removed. The nitrifying liquid in the second aerobic tank 5 flows back to the nitrifying liquid in a high-power mode and circularly enters the anoxic tank 3, and anoxic nitrifying bacteria finish the removal of total nitrogen.

As shown in fig. 2, 3 and 5, the adjusting tank 1 is connected with a lift pump 10 for lifting the sewage at the bottom of the adjusting tank 1 into the anaerobic tank 2, and the lift pump 10 is controlled by a float level meter to be automatically opened and closed. Because the change of the sewage quantity in cities and towns is large in different time periods, if in a holiday, a water peak period can occur when a plurality of outworkers return to the country, and the floating ball liquid level meter is adopted to realize automatic control of the lifting pump 10 according to the sewage quantity and timely lift and treat the sewage in the regulating tank. The second aerobic tank 5 is connected with a nitrifying liquid reflux device 40 which respectively refluxes nitrifying liquid to the regulating tank 1 and the anoxic tank 3, the inclined tube sedimentation tank 6 is connected with a sludge reflux device 30 which discharges sludge back to the anaerobic tank 2, and the nitrifying liquid reflux device 40 and the sludge reflux device 30 are controlled by a PLC (programmable logic controller). Utilize the PLC controller to realize the automatic control to nitrifying liquid reflux unit 40 and sludge reflux unit 30, automatic control opens and shuts it, its operating time of automatic control realizes the automatic reflux of mud and nitrifying liquid, simplifies the holistic manual management degree of difficulty and the intensity of sewage treatment device, does benefit to this sewage treatment device's popularization and used.

As shown in FIG. 4, both the nitrifying liquid reflux unit 40 and the sludge reflux unit 30 are stripping units. The air stripping device comprises a separation box 31, and a return inlet pipe 32, a return outlet pipe 33 and an air pipe 34 are connected to the separation box 31. One end of the backflow inlet pipe 32 is communicated with the separation box 31, the other end of the backflow inlet pipe is communicated with the to-be-refluxed object pool 35, one end of the backflow outlet pipe 33 extends to the bottom of the separation box 31, and the other end of the backflow outlet pipe is communicated with the backflow object backflow channel 37. The diameter of air pipe 34 is less than the diameter of backflow pipe 33 and one end extends to the bottom of separator box 31 and cup joints in backflow pipe 33, and the other end is located the outside of separator box 31 and is connected with backflow fan 36, connects PLC controller 13 on the backflow fan 36, and PLC controller control backflow fan operating time.

The working principle of the air lifting device is that air is filled in an air pipe 34 of a return fan 36 and enters a return outlet pipe 33, so that the pressure in the return outlet pipe 33 is reduced, the pressure in the closed separation box 31 is reduced, at the moment, return matters in a to-be-returned matter pool 35 communicated with the separation box 31 through a return inlet pipe 32 can flow back to the separation box 31, and finally flow into a return matter return channel 37 through the return outlet pipe 33. In the technical scheme, the to-be-refluxed material tank 35 is a second aerobic tank 5 or a co-tubular sedimentation tank 6, and the refluxed material reflux channel 37 is an adjusting tank or an anoxic tank 4 or an anaerobic tank 2.

In the technical scheme, the nitrified water reflux and the sludge reflux are respectively realized by the nitrified liquid reflux device 40 and the sludge reflux device 30, namely, the reflux is realized by the gas stripping device, so that the use of running component equipment such as a pump body is reduced, the failure rate of the whole equipment is reduced, and the maintenance cost is reduced. The sewage treatment equipment has the advantages of less control equipment, simple operation and maintenance, low operation cost, less equipment fault points and simple and convenient maintenance, and meets the requirements of low cost and automatic management of future urban sewage operation.

As shown in figures 3 and 5, partial sludge in the inclined tube sedimentation tank 6 flows back to the anaerobic tank 2, the residual sludge is stripped to the sludge tank 8 by the gas stripping device and is cleaned regularly, the cleaned sludge can be used as field fertilizer by fermentation, waste utilization required by sustainable development is realized, on one hand, the use of chemical fertilizer is reduced, on the other hand, the treatment and waste utilization of the sludge are realized, and the energy conservation and environmental protection are realized.

As shown in fig. 2, the aeration hoses 11 and the dissolved oxygen meters 12 are uniformly arranged in the anoxic tank 3, the first aerobic tank 4 and the second aerobic tank 5, the aeration hoses 11 in the anoxic tank 3, the first aerobic tank 4 and the second aerobic tank 5 are respectively provided with an aeration air valve 15, and the aeration air valves 15 are connected with an aeration fan 14. The dissolved oxygen instrument 13 is connected with the PLC 13, and the aeration fan 14 and the aeration air valve 15 are controlled by the PLC 13.

In the technical scheme of the upper section, the aeration hose 11 is fixedly installed by adopting a circular fixing ring, the installation distance is 10-15 cm, carpet type aeration can be realized, and three-phase high-efficiency mass transfer is completed; the dissolved oxygen instrument 12 is arranged in the aeration area to measure the oxygen content in water, the PLC 13 is used for realizing automatic control, the digital signal range of the oxygen content is set to be in linkage control with the frequency conversion of the aeration fan 14, and the opening frequency of the aeration fan is reduced. According to the characteristics of low carbon source and small water amount of urban inflow water, the amount of dissolved oxygen in an aerobic pool in an A2O process used in the existing market is changed to be 2-3 mg/L, the dissolved oxygen in a first aerobic pool 4 and a second aerobic pool 5 is controlled to be 0.3-1.0mg/L in the technology, the problem that a carbon source needs to be added into the aerobic pools is effectively avoided, and the requirements of low cost and simple and easy management of urban sewage operation in the future are met. Meanwhile, the dissolved amount of oxygen in the anoxic tank 3 is controlled to be less than 0.5mg/L, and the dissolved amount of oxygen in the anaerobic tank 2 is controlled to be less than 0.2 mg/L. Under the anoxic and aerobic environment, the reflux ratio of the nitrifying liquid is controlled by about 300%, the system maintains high-load operation, the low dissolved oxygen state of the aerobic tank is ensured, endogenous consumption of zoogloea due to insufficient intake nutrients can be effectively avoided, and the sludge bulking phenomenon caused by sludge aging is reduced.

Referring to fig. 3 and 5, backwashing systems are arranged at the bottoms of the inclined tube sedimentation tank 6 and the filter tank 7, and each backwashing system comprises a gas washing device arranged at the bottoms of the inclined tube sedimentation tank and the filter tank and a water washing device arranged at the bottom of the filter tank. The water washing device comprises a backwashing water pipe 24 arranged in the filter 7, the backwashing water pipe 24 is connected with a backwashing water valve 25 and a backwashing pump 26, and the backwashing pump 26 is communicated with a water outlet of the filter 7. Namely, the filter 7 is flushed by reverse water by using the clean water discharged from the filter 7, so that the problem of blockage in the filter 7 is avoided.

Referring to fig. 3 and 5, the air washing device comprises a backwashing fan 23 and backwashing air pipes 21 uniformly distributed at the bottoms of the inclined pipe sedimentation tank 6 and the filter tank 7, backwashing air valves 22 are respectively arranged on the backwashing air pipes 21 in the inclined pipe sedimentation tank 6 and the filter tank 7, the backwashing air valves 22 are connected with the backwashing fan 23, and the backwashing pump 26, the backwashing air valves 22, the backwashing water valve 25 and the backwashing fan 23 are controlled by the PLC controller 13. Utilize PLC controller 13 control gas washing device to realize carrying out regular automatic gas washing backwash to pipe chute sedimentation tank 6 and filtering pond 7, avoid pipe chute sedimentation tank 6 and filtering pond 7 to appear blockking up the problem, realize long-range unmanned on duty automatic operation simultaneously.

As shown in the figures 1 and 5, the first aerobic tank 4 and the second aerobic tank 5 are both filled with column type MBBR filling materials 50, and the height of the column type MBBR filling materials 50 is adapted to the depth of the first aerobic tank 5 and the second aerobic tank 6. In the aerobic tank, the installation space of the column type MBBR filler is 20cm, the cross section of the column type MBBR filler is generally 80 x 80mm, the height of the filler is 1.5m, the filler is porous MBBR filler, and a multi-gradient aerobic and anoxic environment can be formed from outside to inside in a short time during strain debugging, so that synchronous short-cut nitrification and denitrification reaction can be realized. Namely, under the aerobic state, the special structure of the column type MBBR packing is from outside to inside, the three states of aerobic, facultative and anaerobic are formed to alternately operate to remove organic matters, a multi-gradient A2O can be formed, and pollutants can be removed efficiently and at low consumption.

In the technical scheme of the upper section, the advantages of the biomembrane method and the activated sludge method are integrated, the column type MBBR filler is suspended in the first aerobic tank 4 and the second aerobic tank 5, the sludge concentration in the tanks can reach 5-8 mg/L, and synchronous nitrification and denitrification are completed under the condition of low dissolved oxygen of 0.3-1.0mg/L, so that the operating energy consumption of the sewage station can be effectively reduced by more than 30%.

In the technical scheme, column type MBBR filling materials are suspended in the first aerobic tank 4 and the second aerobic tank 5, so that a multi-gradient A2O sewage treatment process is formed locally, the nitrification reaction speed of sewage in the first aerobic tank 4 and the second aerobic tank 5 is doubled, and the first aerobic tank 4 and the second aerobic tank 5 are deep bed multiplication tanks.

In the technical scheme, a flocculating agent ferrous sulfate is added to the effluent of the second aerobic tank 5, namely the deep bed multiplication tank, so that nitrified liquid enters the high-efficiency inclined tube sedimentation tank 6, TP, suspended matters and refractory substances are rapidly precipitated, then clear water flows out of an overflow weir 20 connected with the filter tank and enters the filter tank 7, a backwashing system arranged at the bottom of the filter tank 7 periodically performs backwashing on the filter tank, then a suction pump is utilized to suck out water in the filter tank 7 by means of automatic control of an electrode liquid level meter, and the TP removal rate of the system is improved.

Technical solution of the invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive concept and technical solution, or to apply the inventive concept and technical solution to other occasions without any modification.

Claims

1. The utility model provides a town sewage treatment's deep bed multiplication MBBR reactor, its characterized in that, including equalizing basin, anaerobism pond, oxygen deficiency pond and the first good oxygen pond that sets gradually, still including setting up in equalizing basin, anaerobism pond, oxygen deficiency pond and first good oxygen pond one side and respectively with the second good oxygen pond of equalizing basin, oxygen deficiency pond and first good oxygen pond intercommunication, the good oxygen pond opposite side of second is provided with pipe chute sedimentation tank, filtering pond and sludge impoundment, and the pipe chute sedimentation tank is located between filtering pond and the sludge impoundment.

2. The deep-bed multiplication MBBR reactor for town sewage treatment as claimed in claim 1, wherein the adjusting tank is connected with a lift pump for lifting sewage at the bottom of the adjusting tank into the anaerobic tank, the second aerobic tank is connected with a nitrifying liquid reflux device for respectively refluxing nitrifying liquid into the adjusting tank and the anoxic tank, and the inclined tube sedimentation tank is connected with a sludge reflux device for returning sludge into the anaerobic tank.

3. The deep bed multiplication MBBR reactor for town sewage treatment as claimed in claim 2, wherein the nitrifying liquid reflux unit and the sludge reflux unit are air stripping units, the air stripping unit comprises a separation box, a reflux inlet pipe, a reflux outlet pipe and an air pipe are connected to the separation box, one end of the reflux inlet pipe is communicated with the separation box, the other end of the reflux inlet pipe is communicated with the object pool to be refluxed, one end of the reflux outlet pipe extends to the bottom of the separation box, the other end of the reflux outlet pipe is communicated with a reflux object reflux channel, the diameter of the air pipe is smaller than that of the reflux outlet pipe, one end of the air pipe extends to the bottom of the separation box and is sleeved in the reflux outlet pipe, the other end of the air pipe is located outside the separation box and is connected with a reflux fan, the reflux fan is connected with.

4. The deep bed multiplication MBBR reactor for town sewage treatment as claimed in claim 1, wherein the anoxic tank, the first aerobic tank and the second aerobic tank are uniformly provided with aeration hoses and dissolved oxygen meters, the aeration hoses in the anoxic tank, the first aerobic tank and the second aerobic tank are respectively provided with aeration air valves, the aeration air valves are connected with aeration fans, the dissolved oxygen meters are connected with a PLC controller, and the aeration fans and the aeration air valves are controlled by the PLC controller.

5. The deep bed multiplication MBBR reactor for town sewage treatment as claimed in claim 1, wherein the bottom of the inclined tube sedimentation tank and the bottom of the filter tank are both provided with backwashing systems, and the backwashing systems comprise air washing devices arranged at the bottoms of the inclined tube sedimentation tank and the filter tank and water washing devices independently arranged at the bottom of the filter tank;

6. The deep-bed multiplication MBBR reactor for town sewage treatment as claimed in claim 5, wherein the backwash pump is communicated with the water outlet of the filter.

7. The deep-bed multiplication MBBR reactor for urban sewage treatment according to claim 1, wherein the first aerobic tank and the second aerobic tank are filled with column type MBBR packing, and the height of the column type MBBR packing is adapted to the depth of the first aerobic tank and the depth of the second aerobic tank.