A new type of concentric biological pool

Abstract

A new type of concentric biological pool can achieve A according to the requirements of influent water volume, water quality and effluent water quality. 2 O, UCT, MUCT, inverted A 2 O, rapid switching of multi-stage AO process, strong adaptability to water volume and influent water quality, flexible operation control, and process adjustment required due to the large difference between actual water quality and designed water quality becomes simple and easy. It is characterized by comprising an influent distribution facility arranged at the center of the circle, a corridor-type operation room surrounding the center of the circle, a circumferentially divided annular anaerobic tank surrounding the corridor-type operation room, a circumferentially divided annular anoxic tank surrounding the annular anaerobic tank, and a circumferentially divided annular aerobic tank surrounding the annular anoxic tank. The influent distribution facility is connected to the influent main pipe radially extending to the periphery of the biological pool, and the annular aerobic pool is connected to the effluent main pipe leading to the periphery of the biological pool. Different structural configurations are formed by switching valves in the connecting pipeline system between the pool cells to flexibly match different water treatment operation modes.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, in particular to a novel concentric circle biological pool. Background Art

[0002] Traditional A 2 Biochemical treatment structures such as O and UCT are generally rectangular or rectangular combinations. After they are built, it is very difficult to adjust the process because the actual water quality is quite different from the designed water quality. In addition, the traditional single process unit is basically one pool or two pools in parallel. The pool is in a mixed state, the mass transfer gradient is low, and the treatment effect is not good. In addition, the sewage or wastewater of the traditional biochemical process basically flows in one direction, the pipelines in the system are long and dispersed, the head loss is large, and the energy consumption is high. 2 Anaerobic-Anoxic-Oxic (ANO) is an anaerobic-anoxic-aerobic wastewater treatment process, which is a widely used traditional biological nitrogen and phosphorus removal process. The UCT (University of Cape Town) process is an improved A 2 O biological nitrogen and phosphorus removal process, and A 2 The difference is that the return sludge is not returned to the anaerobic tank but to the anoxic tank, and the return of the anoxic tank mixed liquor from the anoxic tank to the anaerobic tank is increased. Summary of the invention

[0003] In view of the defects or shortcomings in the prior art, the present invention provides a novel concentric circle biological pool.

[0004] The technical solution of the present invention is as follows:

[0005] A novel concentric biological pool is characterized by comprising a water inlet and distribution facility arranged at the center of the circle, a corridor-type operating room surrounding the center of the circle, a circumferentially compartmented annular anaerobic pool surrounding the corridor-type operating room, a circumferentially compartmented annular anoxic pool surrounding the annular anaerobic pool, and a circumferentially compartmented annular aerobic pool surrounding the annular anoxic pool. The water inlet and distribution facility is connected to a water inlet main pipe radially extending to the periphery of the biological pool, and the annular aerobic pool is connected to a water outlet main pipe leading to the periphery of the biological pool. Different structural configurations are formed by switching valves in the connecting pipeline system between the pool cells to flexibly match different water treatment operation modes.

[0006] Including switching to form any of the following water treatment operation modes: A 2 O operating mode, UCT operating mode, MUCT operating mode, inverted A without internal reflow 2 O operating mode, inverted A with internal reflow 2 O operation mode, improved A 2 O operating mode, secondary AO operating mode.

[0007] Including the first cell of the anaerobic tank, the second cell of the anaerobic tank, the third cell of the anaerobic tank, the fourth cell of the anaerobic tank, the first cell of the anoxic tank, the second cell of the anoxic tank, the third cell of the anoxic tank, the fourth cell of the anoxic tank, the first cell of the aerobic tank, the second cell of the aerobic tank, the third cell of the aerobic tank, the fourth cell of the aerobic tank, the water inlet pipe of the anaerobic tank, the water inlet pipe of the anoxic tank, the connecting pipe of the anaerobic tank anoxic tank, the connecting pipe of the anaerobic tank and the aerobic tank, the connecting pipe of the anoxic tank and the anaerobic tank, the connecting pipe of the anoxic tank and the aerobic tank, the return sludge main pipe, the return sludge pipe of the anoxic tank, the return sludge pipe of the anaerobic tank, the mixed liquor return main pipe, the mixed liquor return pipe of the first cell of the anoxic tank, the mixed liquor return pipe of the third cell of the anoxic tank, the circulation pipe from the second cell of the anoxic tank to the anaerobic tank, the anoxic The fourth grid of the pool is connected to the anaerobic pool circulation pipe; the first grid of the anaerobic pool, the second grid of the anaerobic pool, the third grid of the anaerobic pool, and the fourth grid of the anaerobic pool form a circular anaerobic pool, which is concentric with the operation room; the first grid of the anoxic pool, the second grid of the anoxic pool, the third grid of the anoxic pool, and the fourth grid of the anoxic pool form a circular anoxic pool, which is concentric with the circular anaerobic pool; the first grid of the aerobic pool, the second grid of the aerobic pool, the third grid of the aerobic pool, and the fourth grid of the aerobic pool form a circular aerobic pool, which is concentric with the circular anoxic pool; the water inlet main pipe is connected to the bottom of the water distribution facility; the water distribution facility is connected to the first grid of the anaerobic pool through the anaerobic pool inlet pipe; the water distribution facility is connected to the first grid of the anoxic pool through the anoxic pool inlet pipe; The fourth cell of the anaerobic tank is connected to the first cell of the anoxic tank through the anaerobic tank anoxic tank connecting pipe; the fourth cell of the anaerobic tank is connected to the first cell of the aerobic tank through the anaerobic tank aerobic tank connecting pipe; the fourth cell of the anoxic tank is connected to the first cell of the anaerobic tank through the anoxic tank anaerobic tank connecting pipe; the fourth cell of the anoxic tank is connected to the first cell of the aerobic tank through the anoxic tank aerobic tank connecting pipe; the first end of the effluent main pipe is connected to the fourth cell of the aerobic tank, and the terminal end is connected to the secondary sedimentation tank; the first end of the sludge return main pipe is connected to the sludge return pump of the secondary sedimentation tank; the first end of the anoxic tank return sludge pipe is connected to the sludge return main pipe, and the terminal end is connected to the first cell of the anoxic tank; the first end of the anaerobic tank return sludge pipe is connected to the sludge return main pipe, and the terminal end is connected to the first cell of the anoxic tank; the first end of the anaerobic tank return sludge pipe is connected to the sludge return pipe. The first end of the mixed liquor return pipe of the first compartment of the anoxic tank is connected to the mixed liquor return main pipe, and the end thereof is connected to the first compartment of the anoxic tank; the first end of the mixed liquor return pipe of the first compartment of the anoxic tank is connected to the mixed liquor return main pipe, and the end thereof is connected to the first compartment of the anoxic tank; the first end of the mixed liquor return pipe of the third compartment of the anoxic tank is connected to the mixed liquor return main pipe, and the end thereof is connected to the third compartment of the anoxic tank; the first end of the circulation pipe from the second compartment of the anoxic tank to the anaerobic tank is connected to the submersible sewage pump located in the second compartment of the anoxic tank, and the end thereof is connected to the first compartment of the anaerobic tank; the first end of the circulation pipe from the fourth compartment of the anoxic tank to the anaerobic tank is connected to the submersible sewage pump located in the fourth compartment of the anoxic tank, and the end thereof is connected to the first compartment of the anaerobic tank.

[0008] A plurality of movable, insertable and depth-adjustable partitions are arranged in the water collection tank of the water inlet and distribution facility.

[0009] Stainless steel extended-stem butterfly valves are installed on the anaerobic tank water inlet pipe, the anoxic tank water inlet pipe, the anaerobic tank anoxic tank connecting pipe, the anaerobic tank aerobic tank connecting pipe, the anoxic tank anaerobic tank connecting pipe, and the anoxic tank aerobic tank connecting pipe.

[0010] A submersible mixer is provided in each compartment of the annular anaerobic tank and the annular anoxic tank.

[0011] Each grid of the annular anaerobic tank and the annular anoxic tank includes a single-channel oxidation ditch.

[0012] The first compartment of the aerobic pool, the second compartment of the aerobic pool, the third compartment of the aerobic pool, and the fourth compartment of the aerobic pool are all equipped with independent aeration systems, and the air flow is adjusted by a regulating valve of the aeration pipe of each compartment.

[0013] The technical effects of the present invention are as follows: A novel concentric biological pool of the present invention can achieve A according to the requirements of water inlet, water quality and outlet water quality through the concentric common wall structure and the switching of connecting pipes and valves. 2 O, UCT, MUCT, inverted A 2 O. The rapid switching of multi-stage AO process has strong adaptability to water volume and inlet water quality, and flexible operation control. The process adjustment required due to the large difference between actual water quality and designed water quality becomes simple and easy.

[0014] Compared with the prior art, the present invention has the following characteristics: 1) The structures of the biochemical section of the existing process are all designed according to one process and do not have the ability to switch processes. The present invention can achieve the switching of multiple processes such as A2O, UCT, MUCT, and inverted A2 / O by adjusting the opening and closing of the corresponding valves without changing the pool body and the aeration system and stirring system in the pool, so as to make full use of the carbon source of the influent, adapt to different influent water volume and water quality, strengthen the denitrification and phosphorus removal effect, and the operation control is very flexible. 2) The water distribution of the influent of the existing process is controlled by the main pipe, branch pipe and corresponding valve, and the automatic proportional drainage cannot be achieved. The present invention can automatically distribute water in proportion, the water distribution pipeline is short, and multi-point water distribution can be achieved, which is convenient for adjusting the operation mode. 3) The sewage or wastewater of the biochemical section of the existing process flows in one direction except for the oxidation ditch. The sewage or wastewater in the present invention is an annular flow or spiral flow, and the annular common wall arrangement is more compact. 4) The grids of the existing processes are all rectangular, while the present invention divides the process units into fan-shaped grids, which are connected end to end to form a unit closed loop, realizing a piston push flow state, with large reaction power and good treatment effect. 5) The existing process has a unique starting point and end point for the mixed liquid reflux, while the present invention has multiple starting points and end points for the mixed liquid reflux, and the process adjustment and control are more flexible. 6) The pipelines of the existing process system are long, relatively scattered, with large head loss and high energy consumption. The system pipelines in the present invention are very short, with small head loss and low energy consumption. 7) The operating valves in the existing process system are scattered, while the pipelines and valves in the system of the present invention can be centrally arranged, and the valves are very convenient to operate. 8) The existing process is difficult to transform into multiple processes, while the present invention can add a small number of pipelines and valves when necessary to improve the A2O and secondary AO processes, and the difficulty of transformation is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a plan view of a novel concentric circle biological pool.

[0016] Figure 2 A novel concentric biological pool is implemented in A 2 1-1 cross-sectional view in O, UCT, and MUCT operating modes. 2 Anaerobic-Anoxic-Oxic (ANO) is an anaerobic-anoxic-aerobic wastewater treatment process, which is a widely used traditional biological nitrogen and phosphorus removal process. The UCT (University of Cape Town) process is an improved A 2 O biological nitrogen and phosphorus removal process, and A 2 The difference is that the return sludge is not returned to the anaerobic tank but to the anoxic tank, and the return of the anoxic tank mixed liquor from the anoxic tank to the anaerobic tank is increased. MUCT (modified university of cape town) is a modified UCT nitrogen and phosphorus removal process.

[0017] Figure 3 The invention is a novel concentric biological pool in which an inverted A 2 1-1 cross-section diagram in O operating mode.

[0018] Figure 4 A novel concentric biological pool is implemented in A 2 Schematic diagram of process configuration in O operating mode.

[0019] Figure 5 Schematic diagram of the process configuration of a novel concentric circle biological pool in the UCT operation mode according to the present invention.

[0020] Figure 6 Schematic diagram of the process configuration of a novel concentric circle biological pool in the MUCT operation mode according to the present invention.

[0021] Figure 7 A novel concentric biological pool of the present invention is implemented in an inverted A without internal reflux 2 Schematic diagram of process configuration in O operating mode.

[0022] Figure 8 A novel concentric biological pool of the present invention is implemented in an inverted A with internal reflux 2 Schematic diagram of process configuration in O operating mode.

[0023] Fig. 9 A novel concentric biological pool according to the present invention is implemented in an improved A 2 Schematic diagram of process configuration in O operating mode.

[0024] Fig.10 Schematic diagram of the process configuration of a novel concentric biological pool in the secondary AO operation mode for implementing the present invention. AO is the abbreviation of Anaerobic Oxic, and the AO process is also called anaerobic aerobic process. A (Anaerobic) is the anaerobic section, which is used for nitrogen and phosphorus removal, and O (Oxic) is the aerobic section, which is used to remove organic matter in water.

[0025] The reference numerals are as follows: 1-water inlet and water distribution facilities; 2-operation room; 31-the first grid of the anaerobic tank; 32-the second grid of the anaerobic tank; 33-the third grid of the anaerobic tank; 34-the fourth grid of the anaerobic tank; 41-the first grid of the anoxic tank; 42-the second grid of the anoxic tank; 43-the third grid of the anoxic tank; 44-the fourth grid of the anoxic tank; 51-the first grid of the aerobic tank; 52-the second grid of the aerobic tank; 53-the third grid of the aerobic tank; 54-the fourth grid of the aerobic tank; 6-water inlet main pipe; 7-anaerobic tank inlet pipe; 8-anoxic tank inlet pipe; 9-anaerobic tank and anoxic tank connecting pipe; 10- connecting pipe between anaerobic tank and aerobic tank; 11- connecting pipe between anoxic tank and anaerobic tank; 12- connecting pipe between anoxic tank and aerobic tank; 13- main effluent pipe; 14- main return sludge pipe; 15- return sludge pipe of anoxic tank; 16- return sludge pipe of anaerobic tank; 17- main return pipe of mixed liquor; 18- return pipe of mixed liquor in the first compartment of anoxic tank; 19- return pipe of mixed liquor in the third compartment of anoxic tank; 20- circulation pipe from the second compartment of anoxic tank to anaerobic tank; 21- circulation pipe from the fourth compartment of anoxic tank to anaerobic tank; A- circular anaerobic tank; B- circular anoxic tank; C- circular aerobic tank. DETAILED DESCRIPTION

[0026] Below is the attached figure ( Figure 1-Figure 10 ) and Examples illustrate the present invention.

[0027] For traditional A 2 Biochemical treatment structures such as O and UCT are generally rectangular or rectangular combinations. After they are built, it is very difficult to adjust the process due to the large difference between the actual water quality and the designed water quality. The present invention adopts a ring-shaped combination of single process units connected end to end, and sets connecting pipes and valves between different process unit compartments, sets a multi-point water distribution pipeline system, sets a multi-point sludge return pipeline system, sets a mixed liquid return pipeline system with different starting points, and sets different internal circulation pipeline systems. Without changing the tank body and the aeration system and stirring system in the tank, it only needs to adjust the corresponding valve opening and closing to achieve A 2 O, UCT, MUCT, inverted A 2 / O and other processes, it is no longer difficult to adjust the process due to the large difference between the actual water quality and the designed water quality.

[0028] In order to solve the problem that the traditional single process unit is basically one pool or two pools in parallel, the pool is in a mixed state, the mass transfer gradient is low, and the treatment effect is poor, the present invention adopts annular gridding of the single process unit, and each single process unit is divided into 2 to 4 grids, so that the water flow in each process unit is in a plug flow state as a whole, without short-circuiting, with a large mass transfer gradient, a high pollutant removal rate, and good effluent quality.

[0029] In view of the problems that sewage or wastewater in traditional biochemical processes basically flows in one direction, the pipelines in the system are long, relatively scattered, the head loss is large, and the energy consumption is high, the sewage or wastewater in the present invention is annular flow or spiral flow, the pipelines in the system are very short, the head loss is very small, the energy consumption is low, the pipelines can be arranged in a centralized manner, and it is also very convenient to operate the valves on the pipelines.

[0030] like Figure 1 , Figure 2 , Figure 3As shown, a novel concentric biological pool comprises a water inlet and water distribution facility 1, an operation room 2, a first cell 31 of an anaerobic pool, a second cell 32 of an anaerobic pool, a third cell 33 of an anaerobic pool, a fourth cell 34 of an anaerobic pool, a first cell 41 of anoxic pool, a second cell 42 of anoxic pool, a third cell 43 of anoxic pool, a fourth cell 44 of anoxic pool, a first cell 51 of an aerobic pool, a second cell 52 of anoxic pool, a third cell 53 of anoxic pool, a fourth cell 54 of anoxic pool, a water inlet main pipe 6, an anaerobic pool water inlet pipe 7, an anoxic pool water inlet pipe 8, an anaerobic pool anoxic pool connecting pipe 9, an anaerobic pool aerobic pool connecting pipe 10, an anoxic pool anaerobic pool connecting pipe 11, an anoxic pool aerobic pool connecting pipe 12, an effluent main pipe 13, a return sludge main pipe 14, an anoxic pool return sludge pipe 15, an anaerobic pool return sludge pipe 16, a mixed The combined liquid return main pipe 17, the mixed liquid return pipe 18 of the first compartment of the anoxic tank, the mixed liquid return pipe 19 of the third compartment of the anoxic tank, the circulation pipe 20 from the second compartment of the anoxic tank to the anaerobic tank, and the circulation pipe 21 from the fourth compartment of the anoxic tank to the anaerobic tank; the water inlet and distribution facility 1 is a concentric circular overflow facility with inlet and outlet from the bottom; the operation room 2 is arranged in a ring, located on the outside of the water inlet and distribution facility 1 and concentric with it; the first compartment 31 of the anaerobic tank, the second compartment 32 of the anaerobic tank, the third compartment 33 of the anaerobic tank, and the fourth compartment 34 of the anaerobic tank are fan-shaped ring pools connected end to end to form a ring-shaped anaerobic tank A; the ring-shaped anaerobic tank A is located on the periphery of the operation room 2 and concentric with the operation room 2; the first compartment 41 of the anoxic tank, the second compartment 42 of the anoxic tank, the third compartment 43 of the anoxic tank, and the fourth compartment 44 of the anoxic tank The fan-shaped annular pool is connected end to end to form an annular anoxic pool B; the annular anoxic pool B is located at the periphery of the annular anaerobic pool A and is concentric with the annular anaerobic pool; the first grid 51 of the aerobic pool, the second grid 52 of the aerobic pool, the third grid 53 of the aerobic pool, and the fourth grid 54 of the aerobic pool are connected end to end to form an annular aerobic pool C; the annular aerobic pool C is located at the periphery of the annular anoxic pool B and is concentric with the annular anoxic pool B; the water inlet main pipe 6 is connected to the bottom of the water inlet distribution facility 1; the water inlet distribution facility 1 is connected to the first grid 31 of the anaerobic pool through the anaerobic pool inlet pipe 7; the water inlet distribution facility 1 is connected to the first grid 41 of the anoxic pool through the anoxic pool inlet pipe 8; the fourth grid 34 of the anaerobic pool is connected to the first grid 44 of the anoxic pool through the anaerobic pool anoxic pool connecting pipe 9 1; the fourth cell 34 of the anaerobic tank is connected to the first cell 51 of the aerobic tank through the anaerobic tank aerobic tank connecting pipe 10; the fourth cell 44 of the anoxic tank is connected to the first cell 31 of the anaerobic tank through the anoxic tank anaerobic tank connecting pipe 11; the fourth cell 44 of the anoxic tank is connected to the first cell 51 of the aerobic tank through the anoxic tank aerobic tank connecting pipe 12; the head end of the effluent main pipe 13 is connected to the fourth cell 54 of the aerobic tank, and the end is connected to the second sedimentation tank; the head end of the return sludge main pipe 14 is connected to the sludge return pump of the second sedimentation tank; the head end of the anoxic tank return sludge pipe 15 is connected to the sludge return main pipe 14, and the end is connected to the first cell 41 of the anoxic tank; the head end of the anaerobic tank return sludge pipe 16 is connected to the sludge return main pipe 14, and the end is connected to the first cell 31 of the anaerobic tank;The head end of the mixed liquor return main pipe 17 is connected to the submersible sewage pump located at the end of the fourth compartment 54 of the aerobic tank; the head end of the mixed liquor return pipe 18 of the first compartment of the anoxic tank is connected to the mixed liquor return main pipe 17, and the end is connected to the first compartment 41 of the anoxic tank; the head end of the mixed liquor return pipe 19 of the third compartment of the anoxic tank is connected to the mixed liquor return main pipe 17, and the end is connected to the third compartment 43 of the anoxic tank; the head end of the circulation pipe 20 from the second compartment of the anoxic tank to the anaerobic tank is connected to the submersible sewage pump located at the second compartment 42 of the anoxic tank, and the end is connected to the first compartment 31 of the anaerobic tank; the head end of the circulation pipe 21 from the fourth compartment of the anoxic tank to the anaerobic tank is connected to the submersible sewage pump located at the fourth compartment 44 of the anoxic tank, and the end is connected to the first compartment 31 of the anaerobic tank. ;

[0031] The annular anaerobic pool A and the annular anoxic pool B share a common wall in the annular direction, and the annular anoxic pool B and the annular aerobic pool C share a common wall in the annular direction.

[0032] The head end of the first cell 31 of the anaerobic tank and the end of the fourth cell 34 of the anaerobic tank share a wall, the head end of the first cell 41 of the anoxic tank and the end of the fourth cell 44 of the anoxic tank share a wall, and the head end of the first cell 51 of the aerobic tank and the end of the fourth cell 54 of the aerobic tank share a wall.

[0033] The first end wall of the first cell 31 of the anaerobic tank, the first end wall of the first cell 41 of the anoxic tank and the first end wall of the first cell 51 of the aerobic tank are located on the same radius of the novel concentric biological pool.

[0034] The annular anaerobic tank A, the annular anoxic tank B, and the annular aerobic tank C can be evenly divided into 2 to 4 grids according to design requirements.

[0035] The water collecting tank is provided with a plurality of movable, insertable and depth-adjustable partitions.

[0036] The anaerobic tank water inlet pipe 7, the anoxic tank water inlet pipe 8, the anaerobic tank anoxic tank connecting pipe 9, the anaerobic tank aerobic tank connecting pipe 10, the anoxic tank anaerobic tank 11, and the anoxic tank aerobic tank connecting pipe 12 are installed with stainless steel extended rod butterfly valves, and the anoxic tank first grid mixed liquor return pipe 18, the anoxic tank third grid mixed liquor return pipe 19, the anoxic tank return sludge pipe 15, and the anaerobic tank return sludge pipe 16 are installed with ordinary butterfly valves.

[0037] The annular anaerobic tank A and the annular anoxic tank B are stirred by a submersible mixer.

[0038] Each grid of the annular anaerobic tank A and the annular anoxic tank B may be in the form of a single-ditch oxidation ditch to form a circulating flow in each grid.

[0039] The first aerobic pool compartment 51, the second aerobic pool compartment 52, the third aerobic pool compartment 53, and the fourth aerobic pool compartment 54 are equipped with independent aeration pipe systems, and the air flow rate can be adjusted by the aeration pipe regulating valve of each compartment, and aeration can be performed in a decreasing aeration manner.

[0040] The process of the present invention is:

[0041] Traditional A 2 O: If Figure 1 , Figure 4 As shown, open the valves and pump groups on the anaerobic tank inlet pipe 7, the anaerobic tank anoxic tank connecting pipe 9, the anoxic tank aerobic tank connecting pipe 12, the anaerobic tank return sludge pipe 16, and the first compartment mixed liquid return pipe 18 of the anoxic tank, and close other valves and pump groups. The wastewater or sewage that needs to be denitrified and dephosphorized first enters the first compartment 31 of the anaerobic tank through the water inlet main pipe 6, the water inlet distribution facility 1, and the anaerobic tank inlet pipe 7, and then enters the second compartment 32 of the anaerobic tank, the third compartment 33 of the anaerobic tank, and the fourth compartment 34 of the anaerobic tank in sequence to complete anaerobic phosphorus release. The effluent of the fourth compartment 34 of the anaerobic tank enters the first compartment 41 of the anoxic tank through the anaerobic tank anoxic tank connecting pipe 9, and then enters the second compartment 42 of the anoxic tank, the third compartment 43 of the anoxic tank, and the fourth compartment 44 of the anoxic tank in sequence to complete denitrification and denitrification. The effluent from the fourth compartment 44 of the anoxic tank enters the first compartment 51 of the aerobic tank through the anoxic tank aerobic tank connecting pipe 12, and then enters the second compartment 52 of the aerobic tank, the third compartment 53 of the aerobic tank, and the fourth compartment 54 of the aerobic tank in sequence to complete nitrification and organic matter removal. The treated wastewater or sewage that meets the standards is discharged to the secondary sedimentation tank through the effluent main pipe 13; the return sludge from the secondary sedimentation tank enters the first compartment 31 of the anaerobic tank through the return sludge main pipe 14 and the return sludge pipe 16 of the anaerobic tank to supplement the activated sludge. The mixed liquor from the fourth compartment 54 of the aerobic tank is returned to the first compartment 41 of the anoxic tank through the mixed liquor return main pipe 17 and the mixed liquor return pipe 18 of the first compartment of the anoxic tank to provide the substrate nitrate nitrogen for denitrification.

[0042] Switch UCT: Figure 1 , Figure 5 As shown, the anaerobic tank inlet pipe 7, the anaerobic tank anoxic tank connecting pipe 9, the anoxic tank aerobic tank connecting pipe 12, the anoxic tank return sludge pipe 15, the anoxic tank first compartment mixed liquor return pipe 18, and the valves and pump groups on the anoxic tank fourth compartment to the anaerobic tank circulation pipe 21 are opened, and other valves and pump groups are closed. The secondary sedimentation tank return sludge and the aerobic tank mixed liquor first enter the anoxic tank first compartment 41, and then the anoxic tank second compartment 42, the anoxic tank third compartment 43, and the anoxic tank fourth compartment 44 in sequence to complete the denitrification and denitrification of the sludge and the mixed liquor. The sludge after eliminating nitrate nitrogen is sent to the anaerobic tank first compartment 31 through the anoxic tank fourth compartment to the anaerobic tank circulation pipe 21 to supplement the activated sludge and complete the efficient phosphorus release.

[0043] Switch MUCT: Figure 1 , Figure 6As shown, open the anaerobic tank inlet pipe 7, the anaerobic tank anoxic tank connecting pipe 9, the anoxic tank aerobic tank connecting pipe 12, the anoxic tank return sludge pipe 15, the anoxic tank third compartment mixed liquor return pipe 19, and the valves and pump groups on the anoxic tank second compartment to the anaerobic tank circulation pipe 20, and close other valves and pump groups. The return sludge from the secondary sedimentation tank first enters the first compartment 41 of the anoxic tank, and then the second compartment 42 of the anoxic tank in turn, and the denitrification and denitrification of the sludge. The sludge after eliminating nitrate nitrogen is sent to the first compartment 31 of the anaerobic tank through the anoxic tank second compartment to the anaerobic tank circulation pipe 20, and the activated sludge is supplemented to complete the efficient phosphorus release. The mixed liquor enters the third compartment 43 of the anoxic tank, and then enters the fourth compartment 44 of the anoxic tank to complete the denitrification and denitrification of the mixed liquor.

[0044] Switching to inverted A2O without internal reflux: Figure 1 , Figure 7 As shown, open the valves and pump groups on the anaerobic tank inlet pipe 7, the anoxic tank inlet pipe 8, the anoxic tank anaerobic tank connecting pipe 11, the anaerobic tank aerobic tank connecting pipe 10, and the anoxic tank return sludge pipe 15, and close other valves and pump groups. The amount of water entering the anaerobic tank inlet pipe 7 and the anoxic tank inlet pipe is proportionally controlled by the plug-in device of the water inlet and water distribution facility 1. This process gives priority to denitrification. Most of the wastewater or sewage first enters the first cell 41 of the anoxic tank through the anoxic tank inlet pipe 8, and the return sludge also enters the first cell 41 of the anoxic tank, and then enters the second cell 42 of the anoxic tank, the third cell 43 of the anoxic tank, and the fourth cell 44 of the anoxic tank in turn to complete denitrification. The effluent of the fourth cell 44 of the anoxic tank enters the first cell 31 of the anaerobic tank, and then enters the second cell 32 of the anaerobic tank, the third cell 33 of the anaerobic tank, and the fourth cell 34 of the anaerobic tank in turn to complete biological phosphorus release. The effluent from the fourth cell 34 of the anaerobic tank enters the first cell 51 of the aerobic tank, and then enters the first cell 52 of the aerobic tank, the third cell 53 of the aerobic tank, and the fourth cell 54 of the aerobic tank in sequence, completing nitrification and removal of organic matter.

[0045] Switching to inverted A2O with internal reflux: Figure 1 , Figure 8 As shown, based on the inverted A2O operation without internal reflux, open the valve on the mixed liquid reflux pipe of the first compartment of the 18 anoxic tank and the corresponding pump group.

[0046] Switch to improved A2O process: Fig. 9 As shown, the improved A2O process can be realized by adding a plug plate in the water inlet and distribution facility 1 and a water inlet pipe of the second compartment 32 of the anaerobic tank.

[0047] Switching to secondary AO process: Fig.10 As shown, the two-stage AO process can be realized by adding a plug plate in the water inlet and distribution facility 1 and a water inlet pipe of the second compartment 32 of the anaerobic tank, adding three connecting pipes and valves, a mixed liquid return pipe, and two water hole gates.

[0048] In order to achieve the purpose of compact structure layout, saving building materials and reducing project cost, the annular anaerobic tank and the annular anoxic tank share a common wall in the annular direction, and the annular anoxic tank and the annular aerobic tank share a common wall in the annular direction.

[0049] In order to realize the special flow state of connecting a single process unit end to end, the first end of the anaerobic tank and the end of the fourth cell of the anaerobic tank share a common wall, the first end of the anoxic tank and the end of the fourth cell of the anoxic tank share a common wall, and the first end of the aerobic tank and the end of the fourth cell of the aerobic tank share a common wall.

[0050] In order to achieve smooth flow between process units and minimize head loss, the first end wall of the anaerobic tank, the first end wall of the anoxic tank and the first end wall of the aerobic tank are located on the same radius of the new concentric biological pool.

[0051] In order to increase the mass transfer gradient, achieve plug flow and avoid short-circuit, the annular anaerobic tank, annular anoxic tank and annular aerobic tank can be divided into 2 to 4 grids according to design requirements.

[0052] In order to achieve efficient and proportional water distribution, the water distribution facility adopts the method of upward flow central tube overflow water distribution, and a number of movable, insertable and depth-adjustable baffles are arranged in the water collection tank.

[0053] In order to facilitate the switching of process flow, taking into account that some pipes will be submerged in water to a certain depth and considering the project cost, stainless steel extended-stem butterfly valves are installed on the anaerobic tank inlet pipe, the anoxic tank inlet pipe, the anaerobic tank anoxic tank connecting pipe, the anaerobic tank aerobic tank connecting pipe, the anoxic tank anaerobic tank connecting pipe, and the anoxic tank aerobic tank connecting pipe, and ordinary butterfly valves are installed on the first mixed liquor return pipe of the anoxic tank, the third mixed liquor return pipe of the anoxic tank, the anoxic tank return sludge pipe, and the anaerobic tank return sludge pipe.

[0054] In order to keep the mixed liquid in a suspended state, the annular anaerobic tank and the annular anoxic tank are stirred by a submersible mixer.

[0055] In order to facilitate stirring and keep the mixed liquid in suspension without dead corners and mud, each grid of the annular anaerobic tank, annular anoxic tank and annular aerobic tank can be in the form of a single-ditch oxidation ditch to form a circulating flow in each grid.

[0056] In order to improve the treatment effect of the aerobic pool and reduce aeration energy consumption, the first compartment of the aerobic pool, the second compartment of the aerobic pool, the third compartment of the aerobic pool, and the fourth compartment of the aerobic pool are installed with independent aeration pipe systems. The flow rate can be adjusted by the aeration pipe valve of each compartment, and aeration can be carried out in a gradual aeration manner.

[0057] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. It is pointed out here that the above description helps those skilled in the art to understand the invention, but does not limit the protection scope of the invention. Any equivalent replacement, modification and / or simplification of the above description without departing from the essence of the invention falls within the protection scope of the invention.

Claims

1. A new type of concentric biological pool, characterized in that: The invention comprises a water inlet and distribution facility arranged at the center of a circle, a corridor-type operation room surrounding the center of a circle, a circumferentially compartmented annular anaerobic tank surrounding the corridor-type operation room, a circumferentially compartmented annular anoxic tank surrounding the annular anaerobic tank, and a circumferentially compartmented annular aerobic tank surrounding the annular anoxic tank. The water inlet and distribution facility is connected to a water inlet main pipe radially extending to the periphery of the biological pool, and the annular aerobic pool is connected to a water outlet main pipe leading to the periphery of the biological pool. Different structural configurations are formed by switching valves in the connecting pipeline system between the pool cells to flexibly match different water treatment operation modes.

2. The novel concentric biological pool according to claim 1, characterized in that: Including switching to form any of the following water treatment operation modes: A 2 O operating mode, UCT operating mode, MUCT operating mode, inverted A without internal reflow 2 O operating mode, inverted A with internal reflow 2 O operation mode, improved A 2 O operating mode, secondary AO operating mode.

3. The novel concentric biological pool according to claim 1, characterized in that: Including the first cell of the anaerobic tank, the second cell of the anaerobic tank, the third cell of the anaerobic tank, the fourth cell of the anaerobic tank, the first cell of the anoxic tank, the second cell of the anoxic tank, the third cell of the anoxic tank, the fourth cell of the anoxic tank, the first cell of the aerobic tank, the second cell of the aerobic tank, the third cell of the aerobic tank, the fourth cell of the aerobic tank, the water inlet pipe of the anaerobic tank, the water inlet pipe of the anoxic tank, the connecting pipe of the anaerobic tank and the anoxic tank, the connecting pipe of the anoxic tank and the aerobic tank, the connecting pipe of the anoxic tank and the anaerobic tank, the connecting pipe of the anoxic tank and the aerobic tank, the return sludge main pipe, the return sludge pipe of the anoxic tank, the anaerobic tank The aerobic tank return sludge pipe, the mixed liquor return main pipe, the mixed liquor return pipe of the first compartment of the anoxic tank, the mixed liquor return pipe of the third compartment of the anoxic tank, the circulation pipe from the second compartment of the anoxic tank to the anaerobic tank, and the circulation pipe from the fourth compartment of the anoxic tank to the anaerobic tank; the first compartment of the anaerobic tank, the second compartment of the anaerobic tank, the third compartment of the anaerobic tank, and the fourth compartment of the anaerobic tank form a circular anaerobic tank, which is concentric with the operation room; the first compartment of the anoxic tank, the second compartment of the anoxic tank, the third compartment of the anoxic tank, and the fourth compartment of the anoxic tank form a circular anoxic tank, which is concentric with the operation room. The first cell of the aerobic pool, the second cell of the aerobic pool, the third cell of the aerobic pool and the fourth cell of the aerobic pool form a circular aerobic pool, which is concentric with the circular anoxic pool; the water inlet main pipe is connected to the bottom of the water distribution facility; the water distribution facility is connected to the first cell of the anaerobic pool through the anaerobic pool inlet pipe; the water distribution facility is connected to the first cell of the anoxic pool through the anoxic pool inlet pipe; the fourth cell of the anaerobic pool is connected to the first cell of the anoxic pool through the anaerobic pool anoxic pool connecting pipe; the fourth cell of the anaerobic pool is connected to the first cell of the anoxic pool through the anaerobic pool anoxic pool connecting pipe; The aerobic tank connecting pipe is connected to the first compartment of the aerobic tank; the fourth compartment of the anoxic tank is connected to the first compartment of the anaerobic tank through the anoxic tank anaerobic tank connecting pipe; the fourth compartment of the anoxic tank is connected to the first compartment of the aerobic tank through the anoxic tank aerobic tank connecting pipe; the head end of the effluent main pipe is connected to the fourth compartment of the aerobic tank, and the end is connected to the secondary sedimentation tank; the head end of the return sludge main pipe is connected to the sludge return pump of the secondary sedimentation tank; the head end of the return sludge pipe of the anoxic tank is connected to the sludge return main pipe, and the end is connected to the first compartment of the anoxic tank; The head end of the anaerobic tank return sludge pipe is connected to the sludge return main pipe, and the end is connected to the first cell of the anaerobic tank; the head end of the mixed liquor return main pipe is connected to the submersible sewage pump, and is located at the end of the fourth cell of the aerobic tank; the head end of the mixed liquor return pipe of the first cell of the anoxic tank is connected to the mixed liquor return main pipe, and the end is connected to the first cell of the anoxic tank; the head end of the mixed liquor return pipe of the third cell of the anoxic tank is connected to the mixed liquor return main pipe, and the end is connected to the third cell of the anoxic tank; the head end of the circulation pipe from the second cell of the anoxic tank to the anaerobic tank is connected to the submersible sewage pump located in the second cell of the anoxic tank, and the end is connected to the first cell of the anaerobic tank; the head end of the circulation pipe from the fourth cell of the anoxic tank to the anaerobic tank is connected to the submersible sewage pump located in the fourth cell of the anoxic tank, and the end is connected to the first cell of the anaerobic tank.

4. The novel concentric biological pool according to claim 1, characterized in that: A plurality of movable, insertable and depth-adjustable partitions are arranged in the water collection tank of the water inlet and distribution facility.

5. The novel concentric biological pool according to claim 3, characterized in that: Stainless steel extended-stem butterfly valves are installed on the anaerobic tank water inlet pipe, the anoxic tank water inlet pipe, the anaerobic tank anoxic tank connecting pipe, the anaerobic tank aerobic tank connecting pipe, the anoxic tank anaerobic tank connecting pipe, and the anoxic tank aerobic tank connecting pipe.

6. The novel concentric biological pool according to claim 3, characterized in that: A submersible mixer is provided in each compartment of the annular anaerobic tank and the annular anoxic tank.

7. The novel concentric biological pool according to claim 3, characterized in that: Each grid of the annular anaerobic tank and the annular anoxic tank includes a single-channel oxidation ditch.

8. The novel concentric biological pool according to claim 3 is characterized in that: The first compartment of the aerobic pool, the second compartment of the aerobic pool, the third compartment of the aerobic pool, and the fourth compartment of the aerobic pool are all equipped with independent aeration systems, and the air flow is adjusted by a regulating valve of the aeration pipe of each compartment.

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