CN106495324A - The multistage AO+SBR sewage disposal reaction tanks of high-efficient denitrification and dephosphorization and method - Google Patents

Abstract

The invention discloses a multi-stage AO+SBR sewage treatment reaction pool and method for efficient denitrification and dephosphorization, including a comprehensive pipe gallery and a mud-water separation pool. pool, the second aerobic pool, the second anoxic pool, the third aerobic pool, the third anoxic pool and the first SBR pool, the first anaerobic pool and the first pre-anoxic pool are set on the left side of the first aerobic pool The fourth aerobic pool, the fourth anoxic pool, the fifth aerobic pool, the fifth anoxic pool, the sixth aerobic pool, the sixth anoxic pool and the second SBR pool are set on the other side of the integrated pipe gallery The second anaerobic tank and the second pre-anoxic tank are set on the left side of the fourth aerobic tank, the mud-water separation tank is connected to the third anoxic tank and the sixth anoxic tank, and the mud-water separation tank is connected to the first pre-anoxic tank and the second anoxic tank. Two pre-anoxic pools. The invention integrates multi-stage AO and SBR processes into a novel combined treatment process, which combines the principles and advantages of multi-stage AO processes and MSBR processes.

Description

High-efficiency denitrification and phosphorus removal multi-stage AO+SBR sewage treatment reaction tank and method

technical field

The invention relates to a water treatment system and method, more specifically, to a multi-stage AO+SBR sewage treatment reaction tank and method for efficient nitrogen and phosphorus removal.

Background technique

With the improvement of effluent water quality requirements, sewage treatment has developed from the separate removal of SS, BOD, COD and other pollutants to the technology of nitrogen and phosphorus removal.

The A ² O process and its variants, especially the multi-stage A/O process with multi-stage water inflow, realize the function of denitrification and phosphorus removal through the alternation of anaerobic, anoxic, and aerobic, and point-by-point water inflow. The multi-stage A/O process with multi-stage water inflow can reasonably use carbon sources and better solve the contradiction between nitrogen and phosphorus removal on carbon sources. At present, it has gradually developed into the mainstream treatment process for nitrogen and phosphorus removal.

The multi-stage A/O process of multi-stage water inflow is composed of multiple A/O in series. The return sludge enters from the first stage, and the sewage enters from each anoxic stage according to a certain proportion. From a formal point of view, the multi-stage A/O process with multi-stage water inflow belongs to the category of post-denitrification. In an ideal state, the nitrifying liquid produced in each aerobic zone of the system directly enters the anoxic zone of the next section for denitrification. Therefore, in theory, there is no need to set up internal backflow facilities. From the way of denitrification, except for the terminal An section, other mixed liquids are involved in the denitrification process. Compared with the traditional A/O process, the multi-stage A/O process with multi-stage water inflow can obtain a higher denitrification rate while saving energy. But it mainly has three shortcomings: 1. Since there is no supplement of influent carbon source in the anaerobic section, the phosphorus removal efficiency needs to be further improved. 2. When the influent carbon source is insufficient, there is only an aerobic section in the An section at the end, which may cause the TN of the effluent to exceed the standard. The main way to solve this problem is to set the sludge backflow in the aerobic section at the last section, and remove nitrate nitrogen or nitrate nitrogen through backflow. Reduce the proportion of water inflow in the most anoxic section. 3. The biological reaction section is separated from the sedimentation section and occupies a large area.

Due to the inherent low efficiency of nitrogen and phosphorus removal in the SBR process, the MSBR process has been successfully developed through research in recent years. The essence of the MSBR process is the same as the traditional A2/O process, which also achieves the function of nitrogen and phosphorus removal through the alternation of anaerobic, anoxic and aerobic. However, because the MSBR process strengthens the functions of each reaction zone and creates more superior environmental and hydraulic conditions for the dominant bacteria, no matter from theoretical analysis or actual operation results, the MSBR process is more effective in biological phosphorus and nitrogen removal. Ideally, at the same time, the anaerobic zone of the MSBR process can also be used as the anaerobic acidification section of the system, which can anaerobically hydrolyze the polymer refractory organic matter in the influent, and the energy released during the release of phosphorus by phosphorus-accumulating bacteria can be used for Phosphorus accumulating bacteria actively absorb acetic acid, H+, and e-, and store them in the form of PHB in the bacteria, thereby promoting the acidification process of organic matter, improving the biodegradability of sewage and the reaction rate of aerobic process, anaerobic, anoxic, The alternation of aerobic processes allows the anaerobic zone to act as an optimal selector at the same time. However, the MSBR process has inherent disadvantages. Because all the influent water passes through the anaerobic section and then goes to the anoxic section, and the aerobic section passes through a large amount of internal reflux to the anoxic section for denitrification, the carbon source utilization efficiency is lower than that of multi-stage A/O. Process and a large amount of internal reflux are not enough to save energy; in addition, the aeration of each SBR process section of the MSBR tank cannot be connected in sequence, resulting in instantaneous peak air supply of the blower, which is not conducive to the operation of the blower.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art. In the framework of the theoretical system for denitrification and phosphorus removal mainly using anaerobic, anoxic and aerobic alternation to realize the denitrification and phosphorus removal function, according to the process flow, Provide a multi-stage AO+SBR sewage treatment reaction tank and method for efficient denitrification and dephosphorization, provide an ingenious pool layout method, integrate multi-stage AO and SBR processes into a new type of combined treatment process, and integrate The principle and advantages of multi-stage AO process and MSBR process.

The purpose of the present invention can be achieved through the following technical solutions.

The multi-stage AO+SBR sewage treatment reaction pool for high-efficiency denitrification and phosphorus removal of the present invention includes comprehensive pipe corridors and mud-water separation pools arranged side by side, and one side of the comprehensive pipe corridors is sequentially provided with interconnected pipes connected to each other from left to right. The first aerobic tank, the first anoxic tank, the second aerobic tank, the second anoxic tank, the third aerobic tank, the third anoxic tank and the first SBR tank, the left side of the first aerobic tank A first anaerobic tank and a first pre-anoxic tank are provided, and the first anaerobic tank communicates with the first pre-anoxic tank and the first aerobic tank respectively,

On the other side of the integrated pipe corridor, there are successively arranged the fourth aerobic pool, the fourth anoxic pool, the fifth aerobic pool, the fifth anoxic pool, the sixth aerobic pool, The sixth anoxic pool and the second SBR pool, the left side of the fourth aerobic pool is provided with a second anaerobic pool and a second pre-anoxic pool, and the second anaerobic pool is respectively connected to the second pre-anoxic pool and the fourth aerobic pool,

The first anaerobic pond, the first pre-anoxic pond, the first anoxic pond, the second anoxic pond and the third anoxic pond are all connected with a first sewage inlet pipe, and the second anaerobic pond, the The second pre-anoxic pool, the fourth anoxic pool, the fifth anoxic pool and the sixth anoxic pool are all connected to the second sewage inlet pipe, and the first SBR pool and the second SBR pool are respectively connected to the first water outlet pipe and the second outlet pipe, the first SBR pool and the second SBR pool are all communicated with the mud-water separation pool, and the mud-water separation pool is respectively connected to the third anoxic pool and the sixth anoxic pool through a supernatant liquid pipe, and the The mud-water separation tank is respectively connected to the first pre-anoxic tank and the second pre-anoxic tank through the sludge pipe.

Both the first SBR tank and the second SBR tank are connected to the mud-water separation tank through a return pump.

The first aerobic pool, the second aerobic pool, the third aerobic pool, the fourth aerobic pool, the fifth aerobic pool, the sixth aerobic pool, the first anoxic pool, the second anoxic pool, The third anoxic pool, the fourth anoxic pool, the fifth anoxic pool, the sixth anoxic pool, the first SBR pool, the second SBR pool, the first anaerobic pool, the second anaerobic pool, the first pre-anoxic pool Both the oxygen tank and the second pre-anoxic tank are equipped with dissolved oxygen detectors linked with the explosion system.

The first anaerobic tank, the first pre-anoxic tank, the first aerobic tank, the first anoxic tank, the second aerobic tank, the second anoxic tank, the third aerobic tank, and the third anoxic tank , the first SBR pond constitutes the first series, the second anaerobic pond, the second pre-anoxic pond, the fourth aerobic pond, the fourth anoxic pond, the fifth aerobic pond, the fifth anoxic pond, The sixth aerobic pool, the sixth anoxic pool, and the second SBR pool constitute the second series, and the two series are continuously fed with water at the same time, and the water is cyclically switched and drained.

The purpose of the present invention can also be achieved through the following technical solutions.

The multi-stage AO+SBR combined sewage treatment method for efficient nitrogen and phosphorus removal includes the following steps:

(1) After the pretreatment process, the sewage entering the plant enters the first pre-anoxic pool, the second pre-anoxic pool, the first anaerobic pool, the second anaerobic pool, the first anoxic pool, and the second anoxic pool pool, the third anoxic pool, the fourth anoxic pool, the fifth anoxic pool, and the sixth anoxic pool, after nitrification and denitrification, respectively enter the first SBR pool and the second SBR pool, and then enter the mud-water separation pool;

(2) The supernatant separated from the mud-water separation tank is transported to the third anoxic tank and the sixth anoxic tank respectively, and the sludge concentrated from the mud-water separation tank enters the first pre-anoxic tank and the second pre-anoxic tank respectively through lifting. The pre-anoxic tank is mixed with part of the sewage for anoxic denitrification and denitrification;

(3) The sludge mixture after anoxic denitrification denitrification enters the first anaerobic tank and the second anaerobic tank for phosphorus release, and then enters the first aerobic tank and the fourth aerobic tank for nitrification , into the first anoxic pool and the fourth anoxic pool for denitrification, after subsequent repeated nitrification and denitrification, respectively enter the first SBR pool and the second SBR pool, and then enter the mud-water separation pool to form a cycle.

The sewage entering the plant is transported to the first pre-anoxic tank, the first anaerobic tank, the first anoxic tank, the second anoxic tank, and the third anoxic tank through the first sewage inlet pipe, and is transported through the second sewage inlet pipe transported to the second pre-anoxic tank, the second anoxic tank, the fourth anoxic tank, the fifth anoxic tank, and the sixth anoxic tank, and the first sewage inlet pipe and the second sewage inlet pipe are continuously fed into the water.

The first SBR pool and the second SBR pool are switched to circulate water and drain water intermittently.

Compared with the prior art, the beneficial effects brought by the technical solution of the present invention are:

(1) The present invention is equipped with a dissolved oxygen measuring instrument linked with the explosion system in the OA section and the SBR section, so that it can automatically adjust the blast volume to save energy consumption, and the switching of the operating cycle and the sequential operation of each equipment are all implemented automatic control;

(2) The present invention adopts an intensive integrated design and a deep pool structure, and does not separately set up a secondary settling tank and a return pump room, which saves process head loss and improves land utilization; the present invention reserves the water inlet for the anaerobic section, For biological phosphorus removal, continuous anaerobic tank water intake can greatly increase the concentration of BOD ₅ and VFA (volatile fatty acids) in the anaerobic zone, thereby improving the phosphorus removal effect;

(3) The present invention is composed of a multi-stage AO system and an SBR system connected in series, which integrates all the advantages of the multi-stage AO and MSBR, the effluent quality is stable and efficient, and has strong impact load resistance; the multi-stage AO and SBR process The integration of the carbon source makes better use of the carbon source. It continuously feeds water at points in the multi-stage AO section, and transfers most of the aerobic capacity from the SBR pool to the continuously operating AO pool, which solves the equipment utilization of the previous SBR reaction pool. not high problem;

(4) Since the present invention adopts multi-stage AO in the main reaction section, compared with MSBR, this process reduces aerobic sludge reflux, improves the sludge concentration in the initial reaction section, and improves the denitrification reaction rate in the anoxic section , which improves the nitrification reaction rate in the aerobic section; most of the reaction areas are operated in multi-stage AO mode, which avoids the problem of not being able to adapt to the hydraulic impact load when only using SBR;

(5) The present invention continues the setting of the mud-water separation tank in the MSBR process, and through the separation of the sedimentation section and the mud-water separation tank in the SBR tank, the sludge concentration of the external backflow is further improved, and the reaction rate of the anoxic section and the aerobic section is improved .

Description of drawings

Fig. 1 is the plane layout drawing of reaction pool among the present invention;

Fig. 2 is a flow chart of the treatment process of the biological reaction section in the present invention.

Reference signs: the first anaerobic pool of A1; the first anoxic pool of A2; the first aerobic pool of A3; the first anoxic pool of A4; the second aerobic pool of A5; the second anoxic pool of A6; the third of A7 Aerobic pool; A8 third anoxic pool; A9 first SBR pool; A10 first outlet pipe; A11 first sewage inlet pipe; B1 second anaerobic pool; B2 second pre-anoxic pool; B3 fourth aerobic pool Pool; B4 the fourth anoxic pool; B5 the fifth aerobic pool; B6 the fifth anoxic pool; B7 the sixth aerobic pool; B8 the sixth anoxic pool; B9 the second SBR pool; B10 the second outlet pipe; B11 The second sewage inlet pipe; C1 mud-water separation tank; C2 supernatant liquid pipe; C3 sludge pipe; D integrated pipe gallery.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

The multi-stage AO+SBR sewage treatment reaction pool for high-efficiency denitrification and dephosphorization of the present invention, as shown in Figure 1, includes a comprehensive pipe gallery D and a mud-water separation pool C1 arranged side by side, and one side of the comprehensive pipe gallery D is from the left To the right, there are the first aerobic pool A3, the first anoxic pool A4, the second aerobic pool A5, the second anoxic pool A6, the third aerobic pool A7, and the third anoxic pool A8 which are connected to each other in sequence. and the first SBR pool A9, the left side of the first aerobic pool A3 is provided with the first anaerobic pool A1 and the first pre-anoxic pool A2, and the first anaerobic pool A1 communicates with the first pre-anoxic pool respectively A2 and the first aerobic pool A3.

On the other side of the integrated utility corridor D, the fourth aerobic pool B3, the fourth anoxic pool B4, the fifth aerobic pool B5, the fifth anoxic pool B6, the Six aerobic pools B7, the sixth anoxic pool B8 and the second SBR pool B9, the left side of the fourth aerobic pool B3 is provided with a second anaerobic pool B1 and a second pre-anoxic pool B2, the second The anaerobic pool B1 communicates with the second pre-anoxic pool B2 and the fourth aerobic pool B3 respectively.

The first anoxic pool A1 , the first pre-anoxic pool A2 , the first anoxic pool A4 , the second anoxic pool A6 and the third anoxic pool A8 are all connected to a first sewage inlet pipe A11 . The second anoxic tank B1, the second pre-anoxic tank B2, the fourth anoxic tank B4, the fifth anoxic tank B6 and the sixth anoxic tank B8 are all connected to a second sewage inlet pipe B11. The first SBR pool A9 and the second SBR pool B9 are respectively connected with a first water outlet pipe A10 and a second water outlet pipe B10, and both the first SBR pool A9 and the second SBR pool B9 are separated from the external return muddy water by a return flow pump Pool C1 (sludge concentration pool) is connected. The mud-water separation pool C1 is respectively connected to the third anoxic pool A8 and the sixth anoxic pool B8 through the supernatant pipe C2, and the mud-water separation pool C1 is respectively connected to the first pre-anoxic pool A2 and the sixth anoxic pool B8 through the sludge pipe C3. Two pre-anoxic pools B2. The first aerobic pool A3, the second aerobic pool A5, the third aerobic pool A7, the fourth aerobic pool B3, the fifth aerobic pool B5, the sixth aerobic pool B7, and the first anoxic pool A4 , the second anoxic pool A6, the third anoxic pool A8, the fourth anoxic pool B4, the fifth anoxic pool B6, the sixth anoxic pool B8, the first SBR pool A9, the second SBR pool B9, the first The anaerobic pool A1, the second anaerobic pool B1, the first pre-anoxic pool A2 and the second pre-anoxic pool B2 are all equipped with a dissolved oxygen detector linked with the gas explosion system, so that it can automatically adjust the blast volume to Energy saving, switching of operating cycles and timing operations of each device are automatically controlled.

Each sewage treatment reaction pool is divided into two series, consisting of nineteen cells in total, among which, the first anaerobic pool A1, the first pre-anoxic pool A2, the first aerobic pool A3, the first anoxic pool A4, The second aerobic pool A5, the second anoxic pool A6, the third aerobic pool A7, the third anoxic pool A8, and the first SBR pool A9 constitute the first series; the second anaerobic pool B1, the second pre-anoxic pool Oxygen pool B2, fourth aerobic pool B3, fourth anoxic pool B4, fifth anoxic pool B5, fifth anoxic pool B6, sixth aerobic pool B7, sixth anoxic pool B8, second SBR pool B9 constitutes the second series; the two series are continuously fed at the same time, and the two series are intermittently drained, and the drainage time does not overlap.

The middle bottom baffle of the MSBR reaction tank is set between the last anoxic section and the SBR tank, which can effectively avoid the influence of the hydraulic jet, thereby improving the hydraulic operation state. In the pre-sedimentation process before the SBR tank is switched to the sedimentation tank, a high-concentration sludge layer is formed in its lower part. The influent water of the tank enters from the bottom water distribution tank of the SBR tank, passes through the sludge layer, and the sludge layer plays the role of contact filtration, that is, the nitrate from the mixed solution of the aeration tank is used as the oxygen source to remove the sludge. While self-digestion is stable, the suspended solids in the influent water are filtered out.

As shown in Figure 2, the specific process of the multi-stage AO+SBR combined sewage treatment method for efficient nitrogen and phosphorus removal of the present invention:

First of all, after the pretreatment process, the sewage entering the plant enters the first pre-anoxic pool A2, the second pre-anoxic pool B2, the first anaerobic pool A1, the second anaerobic pool B1, and the second anaerobic pool of the AO+SBR reaction pool in points. The first anoxic pool A4, the second anoxic pool A6, the third anoxic pool A8, the fourth anoxic pool B4, the fifth anoxic pool B6, and the sixth anoxic pool B8, after repeated nitrification and denitrification Enter the first SBR pool A9 and the second SBR pool B9 respectively, and enter the mud-water separation pool C1; the sewage entering the plant is transported to the first pre-anoxic pool A2, the first anaerobic pool A1, and the first sewage water inlet pipe A11. The first anoxic pool A4, the second anoxic pool A6, and the third anoxic pool A8 are transported to the second pre-anoxic pool B2, the second anoxic pool B1, and the fourth anoxic pool B4 through the second sewage inlet pipe B11 , the fifth anoxic pool B6, the sixth anoxic pool B8, and the first sewage water inlet pipe A11 and the second sewage water inlet pipe B11 simultaneously and continuously feed water;

Then, the supernatant separated from the mud-water separation tank C1 is transported to the third anoxic tank A8 and the sixth anoxic tank B8 respectively, and the sludge concentrated from the mud-water separation tank C1 enters the first pre-anoxic tank respectively by lifting A2 and the second pre-anoxic pool B2 are mixed with part of the sewage to perform anoxic denitrification and denitrification, and the nitrate nitrogen returned is fully denitrified;

Finally, the sludge mixture after anoxic denitrification and denitrification enters the first anaerobic pool A1 and the second anaerobic pool B1 respectively, and the phosphorus-rich sludge fully releases phosphorus, and then enters the first aerobic pool respectively A3 and the fourth aerobic pool B3 fully nitrify the ammonia nitrogen in the sewage, and then enter the first anoxic pool A4 and the fourth anoxic pool B4 for full denitrification, after subsequent repeated nitrification and denitrification Then enter the first SBR pool A9 and the second SBR pool B9 respectively, and enter the mud-water separation pool C1 for mud-water separation to form a cycle.

The first SBR pool A9 and the second SBR pool B9 are alternately used as sedimentation tanks, and the water is switched in circulation and drained intermittently. If the first SBR tank A9 serves as a sedimentation tank to discharge water, the first SBR tank A9 firstly performs anoxic reaction, then performs aerobic reaction, or alternately performs anoxic and aerobic reactions. In the stage of anoxic and aerobic reaction, the mixed solution of the first SBR tank A9 flows back to the mud-water separation tank C1 through the return pump, the supernatant of the mud-water separation tank C1 enters the third anoxic tank A8, and the sedimented sludge is lifted into the first A pre-anoxic pool A2, after anoxic denitrification and denitrification, enters the first anaerobic pool A1, mixes with some sewage to release phosphorus, and circulates in turn. If the second SBR tank B9 is used as a sedimentation tank to discharge water, the circulation principle is the same as above.

The mud-water separation tank C1 concentrates the sludge returned from the first SBR tank A9 or the second SBR tank B9 by 2 to 3 times, and simultaneously enters the first pre-anoxic tank A2 and the first anaerobic tank A1 ( Or the reflux of the second pre-anoxic tank B2 and the second anaerobic tank B1) is reduced by more than 70%, thereby strengthening the nitrogen and phosphorus removal effect of the system. Since the main reaction section adopts multi-stage AO, this process does not need to set internal reflux, and the reflux pump from the first SBR tank A9 or the second SBR tank B9 to the mud-water separation tank C1 can be adjusted at variable speeds to ensure the sludge balance of the entire system.

Similar to T-type oxidation ditch, Unitank, MSBR and other systems, multi-stage AO+SBR also divides the operation process into different time periods. In different periods of the same cycle, some units adopt different operation methods to complete different treatments. Purpose. MSBR system is composed of traditional A2/O system and SBR system in series, and combines all the advantages of A2/O and SBR.

A typical AO+SBR process divides an operation cycle into six periods (which can be automatically set and adjusted), and three periods form a half cycle. In two adjacent half-cycles, except for the different operating modes of the sequencing batch pool, the operating modes of the other units are exactly the same. Generally, the duration of each period is shown in Table 1:

Table 1 AO-SBR process operation schedule

period 1 period 2 period 3 period 4 period 5 Period 6 30min 60min 30min 30min 60min 30min

Among them, periods 1, 2, and 3 are the first half cycle, and periods 4, 5, and 6 are the second half cycle. The outlet water is cycled and switched between the first SBR pool A9 and the second SBR pool B9, as shown in Table 2.

Table 2 AO-SBR water output per cycle

In the first half cycle, the second SBR tank B9 acts as a sedimentation tank, and in the second half cycle, the unit first SBR tank A9 acts as a sedimentation tank.

The reflux of the AO-SBR process only has external reflux and no sludge internal reflux.

The working status of each pool in the AO-SBR process is determined according to the time period in each cycle as shown in Table 3:

Table 3 Function table of each unit in AO-SBR process cycle

Since there is an anoxic section before the SBR section, the SBR tank of the instant AO-SBR process is intermittent aeration like the MSBR process, but the aeration of the first SBR tank A9 and the second SBR tank B9 can be perfectly connected in time sequence, which can make The air supply in the blower room is relatively uniform, and there is no instantaneous high air volume.

Although the function and working process of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific functions and working process, and the above-mentioned specific implementation is only illustrative, rather than limiting. Under the enlightenment of the present invention, those skilled in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims, and these all belong to the protection of the present invention.

Claims (7)

1. High-efficiency denitrification and phosphorus removal multi-stage AO+SBR sewage treatment reaction pool, characterized in that it includes a comprehensive pipe corridor (D) and a mud-water separation tank (C1) arranged side by side, and the comprehensive pipe corridor (D)- The first aerobic pool (A3), the first anoxic pool (A4), the second aerobic pool (A5), the second anoxic pool (A6), and the third Aerobic pool (A7), the third anoxic pool (A8) and the first SBR pool (A9), the left side of the first aerobic pool (A3) is provided with the first anaerobic pool (A1) and the first preliminary anoxic pool (A2), the first anaerobic pool (A1) communicates with the first pre-anoxic pool (A2) and the first aerobic pool (A3) respectively, On the other side of the integrated pipe corridor (D), there are successively arranged from left to right the fourth aerobic pool (B3), the fourth anoxic pool (B4), the fifth aerobic pool (B5), The fifth anoxic pool (B6), the sixth aerobic pool (B7), the sixth anoxic pool (B8) and the second SBR pool (B9), the left side of the fourth aerobic pool (B3) is provided with the first Two anaerobic ponds (B1) and the second pre-anoxic pond (B2), the second anaerobic pond (B1) communicates with the second pre-anoxic pond (B2) and the fourth aerobic pond (B3) respectively, The first anoxic tank (A1), the first pre-anoxic tank (A2), the first anoxic tank (A4), the second anoxic tank (A6) and the third anoxic tank (A8) are all connected with The first sewage inlet pipe (A11), the second anaerobic tank (B1), the second pre-anoxic tank (B2), the fourth anoxic tank (B4), the fifth anoxic tank (B6) and the sixth Anoxic pools (B8) are connected with a second sewage inlet pipe (B11), and the first SBR pool (A9) and the second SBR pool (B9) are respectively connected with a first water outlet pipe (A10) and a second water outlet pipe (B10), the first SBR pond (A9) and the second SBR pond (B9) are all communicated with the mud-water separation pond (C1), and the mud-water separation pond (C1) is respectively connected with the first SBR pond (C2) through the supernatant liquid pipe (C2). The third anoxic tank (A8) and the sixth anoxic tank (B8), the mud-water separation tank (C1) communicates with the first pre-anoxic tank (A2) and the second pre-anoxic tank respectively through the sludge pipe (C3) (B2). 2. The efficient denitrification and dephosphorization multistage AO+SBR sewage treatment reaction tank according to claim 1 is characterized in that, the first SBR pool (A9) and the second SBR pool (B9) are all connected by a backflow pump and The mud-water separation pool (C1) is connected. 3. The efficient nitrogen and phosphorus removal multi-stage AO+SBR sewage treatment reaction pool according to claim 1, characterized in that, the first aerobic pool (A3), the second aerobic pool (A5), the third Aerobic pool (A7), fourth aerobic pool (B3), fifth aerobic pool (B5), sixth aerobic pool (B7), first anoxic pool (A4), second anoxic pool (A6 ), the third anoxic pool (A8), the fourth anoxic pool (B4), the fifth anoxic pool (B6), the sixth anoxic pool (B8), the first SBR pool (A9), the second SBR pool (B9), the first anaerobic tank (A1), the second anaerobic tank (B1), the first pre-anoxic tank (A2) and the second pre-anoxic tank (B2) are all equipped with an explosion system linkage dissolved oxygen meter. 4. The efficient nitrogen and phosphorus removal multi-stage AO+SBR sewage treatment reaction tank according to claim 1, characterized in that, the first anaerobic tank (A1), the first pre-anoxic tank (A2), the first One aerobic pool (A3), the first anoxic pool (A4), the second aerobic pool (A5), the second anoxic pool (A6), the third aerobic pool (A7), the third anoxic pool ( A8), the first SBR pool (A9) constitute the first series, the second anaerobic pool (B1), the second pre-anoxic pool (B2), the fourth aerobic pool (B3), the fourth anoxic pool The pool (B4), the fifth aerobic pool (B5), the fifth anoxic pool (B6), the sixth aerobic pool (B7), the sixth anoxic pool (B8), and the second SBR pool (B9) constitute the first Two series, the two series are continuously fed water at the same time, and the water is drained by cycle switching. 5. The sewage treatment method based on the multi-stage AO+SBR sewage treatment reaction tank for efficient nitrogen and phosphorus removal according to claims 1 to 4, characterized in that it comprises the following steps: (1) After the pretreatment process, the sewage entering the plant enters the first pre-anoxic pool (A2), the second pre-anoxic pool (B2), the first anaerobic pool (A1), and the second anaerobic pool (B1) ), the first anoxic pool (A4), the second anoxic pool (A6), the third anoxic pool (A8), the fourth anoxic pool (B4), the fifth anoxic pool (B6), the sixth anoxic pool Oxygen tank (B8), after nitrification and denitrification, respectively enters the first SBR tank (A9) and the second SBR tank (B9), and enters the mud-water separation tank (C1); (2) The supernatant separated from the mud-water separation tank (C1) is transported to the third anoxic tank (A8) and the sixth anoxic tank (B8) respectively, and the sludge concentrated from the mud-water separation tank (C1) passes through Elevate into the first pre-anoxic tank (A2) and the second pre-anoxic tank (B2) respectively and mix with part of the sewage for anoxic denitrification and denitrification; (3) The sludge mixture after anoxic denitrification and denitrification enters the first anaerobic tank (A1) and the second anaerobic tank (B1) respectively for phosphorus release, and then enters the first aerobic tank (A3) respectively Nitrification reaction with the fourth aerobic pool (B3), enter the first anoxic pool (A4) and the fourth anoxic pool (B4) for denitrification, and then enter the first anoxic pool (B4) after subsequent repeated nitrification and denitrification The SBR pool (A9) and the second SBR pool (B9) enter the mud-water separation pool (C1) to form a circulation. 6. The multi-stage AO+SBR combined sewage treatment method for highly efficient nitrogen and phosphorus removal according to claim 5, characterized in that, the sewage entering the plant is transported to the first pre-sewage through the first sewage inlet pipe (A11) Oxygen tank (A2), first anaerobic tank (A1), first anoxic tank (A4), second anoxic tank (A6), third anoxic tank (A8), through the second sewage inlet pipe (B11 ) to the second pre-anoxic tank (B2), the second anaerobic tank (B1), the fourth anoxic tank (B4), the fifth anoxic tank (B6), the sixth anoxic tank (B8), and The first sewage water inlet pipe (A11) and the second sewage water inlet pipe (B11) simultaneously and continuously feed water. 7. The multi-stage AO+SBR combined sewage treatment method for efficient denitrification and dephosphorization according to claim 5, characterized in that, the first SBR pool (A9) and the second SBR pool (B9) are cyclically switched to discharge water , intermittent drainage.