Circular AAO-MBR sewage treatment device and AO-MBR sewage treatment device

Abstract

According to the circular AAO-MBR sewage treatment device and the AO-MBR sewage treatment device, a circular anaerobic tank serves as the center, an anoxic tank, an aerobic tank and a membrane tank are sequentially arranged on the periphery of the circular anaerobic tank, the hydraulic conditions of all stirring machines are optimized, and the stirring effect is improved. The anaerobic tank, the anoxic tank, the aerobic tank and the membrane tank are separated through the partition walls, and the reflux pumps are arranged at the partition walls, so that sludge in the device can flow back to the water tank with the low oxygen content requirement step by step from the water tank with the high oxygen content requirement, and the requirement of the anoxic tank and the anaerobic tank for gradually reducing dissolved oxygen can be easily met through the arrangement mode.

Description

Technical Field

[0001] The present application belongs to the technical field of sewage treatment, and in particular, relates to a circular AAO-MBR sewage treatment device and an AO-MBR sewage treatment device. Background Art

[0002] AAO process, short for Anaerobic-Anoxic-Oxic in English, is a combination of traditional activated sludge process, biological nitrification and denitrification process and biological phosphorus removal process. It consists of anaerobic tank, anoxic tank, aerobic tank and sedimentation tank. The function of anaerobic tank is to release phosphorus and oxidize some organic matter at the same time; the primary function of anoxic tank is to remove nitrogen, and nitrate nitrogen is sent from aerobic reactor through internal circulation; the functions of aerobic tank include removal of organic matter, nitrification and absorption of phosphorus; the function of sedimentation tank is mud and water separation, part of the sludge is returned to the anaerobic reactor, and the supernatant is discharged as treated water.

[0003] MBR (Membrane Bio-Reactor, MBR for short) is a new water treatment technology that organically combines membrane separation technology with biotechnology. It uses membrane separation equipment to intercept the activated sludge and macromolecular organic matter in the biochemical reaction tank, eliminating the need for a secondary sedimentation tank. The membrane bioreactor process greatly enhances the function of the bioreactor through membrane separation technology, greatly increases the concentration of activated sludge, and its hydraulic retention time (HRT) and sludge retention time (SRT) can be controlled separately. A portion of the volume in the O tank is set aside to place MBR, forming the AAO-MBR process, which can give full play to the advantages of both AAO and MBR and is currently a widely used process.

[0004] The overall pool shape is a common layout method. The main advantage is that the structure has good stress resistance and saves space. However, the conventional membrane pool is currently rectangular. When a rectangular membrane pool is placed inside a circular pool, the four corners of the rectangle are close to the outer circumference, and the four sides are far from the outer circumference, forming an irregular shape, which often causes poor hydraulic conditions and forms dead corners; or requires additional stirring equipment. Therefore, the existing circular AAO-MBR still has certain bottlenecks. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to solve the structural deficiencies of the circular AAO-MBR process sewage treatment device in the prior art, thereby providing a circular AAO-MBR sewage treatment device and an AO-MBR sewage treatment device.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A circular AAO-MBR sewage treatment device, comprising:

[0008] An anaerobic tank, wherein the anaerobic tank is circular;

[0009] An anoxic tank is arranged around the anaerobic tank, and the anoxic tank is separated from the anaerobic tank by a first partition wall;

[0010] an aerobic pool, arranged around the anoxic pool, wherein the aerobic pool and the anoxic pool are separated by a second partition wall;

[0011] A membrane pool is arranged around the aerobic pool, the membrane pool is separated from the aerobic pool by a third partition wall, and the outer side of the membrane pool has an outer wall;

[0012] A first mixer is arranged in the anaerobic tank and is used to stir the sludge and water in the anaerobic tank;

[0013] a first reflux pump, installed at the first partition wall, for conveying the sludge in the anoxic tank to the anaerobic tank;

[0014] A second mixer is arranged in the anoxic tank and is used to stir the sludge and water in the anoxic tank;

[0015] a second reflux pump, installed at the second partition wall, for conveying the mixed liquid in the aerobic pool to the anoxic pool;

[0016] A third mixer is arranged in the aerobic tank and is used to stir the sludge and water in the aerobic tank;

[0017] A third reflux pump, installed at the third partition wall, for conveying the mixed liquid in the membrane pool to the aerobic pool;

[0018] The membrane assembly is arranged in the membrane pool and is used for intercepting activated sludge and macromolecular organic matter in the membrane pool.

[0019] In an optional embodiment, in the circular AAO-MBR sewage treatment device of the utility model, the anaerobic tank, the anoxic tank, the aerobic tank and the membrane tank are all concentrically arranged.

[0020] In an optional embodiment, in the circular AAO-MBR sewage treatment device of the present invention, the first mixer is a vertical paddle mixer, which is placed at the center of the anaerobic tank.

[0021] In an optional embodiment, in the circular AAO-MBR sewage treatment device of the utility model, the second mixer is a submersible flow propeller.

[0022] In an optional embodiment, in the circular AAO-MBR sewage treatment device of the present invention, a plurality of the second mixers are provided and are evenly arranged in the center of the flow channel of the anoxic tank.

[0023] In an optional embodiment, in the circular AAO-MBR sewage treatment device of the utility model, the first reflux pump, the second reflux pump and the third reflux pump are submersible reflux pumps.

[0024] In an optional embodiment, in the circular AAO-MBR sewage treatment device of the utility model, the third mixer is a submersible flow propeller.

[0025] In an optional embodiment, in the circular AAO-MBR sewage treatment device of the utility model, the membrane pool is divided into a plurality of cells along the circumferential direction.

[0026] In an optional embodiment, in the circular AAO-MBR sewage treatment device of the utility model, adjacent cells of the membrane pool are separated by gates.

[0027] In an optional embodiment, the circular AAO-MBR sewage treatment device of the utility model further includes a water inlet pipe, one end of which is connected to a water supply system, and the other end is connected to the anaerobic tank.

[0028] In an optional embodiment, the utility model provides a circular AO-MBR sewage treatment device, including an anaerobic tank or an anoxic tank, and further comprising:

[0029] an aerobic tank, arranged around the anaerobic tank or the anoxic tank, wherein the aerobic tank is separated from the anaerobic tank or the anoxic tank by a second partition wall;

[0030] A membrane pool is arranged around the aerobic pool, the membrane pool is separated from the aerobic pool by a third partition wall, and the outer side of the membrane pool has an outer wall;

[0031] A second reflux pump, installed at the second partition wall, for conveying the mixed liquid in the aerobic tank to the anaerobic tank or the anoxic tank;

[0032] A third mixer is arranged in the aerobic tank and is used to stir the sludge and water in the aerobic tank;

[0033] A third reflux pump, installed at the third partition wall, for conveying the mixed liquid in the membrane pool to the aerobic pool;

[0034] The membrane assembly is arranged in the membrane pool and is used for intercepting activated sludge and macromolecular organic matter in the membrane pool.

[0035] The beneficial effects of the utility model are as follows: the circular AAO-MBR sewage treatment device of the utility model is centered on a circular anaerobic tank, and an anoxic tank, an aerobic tank and a membrane tank are arranged in sequence on the periphery, and each tank is circular or annular, so that the hydraulic conditions of each mixer are optimized and the stirring effect is improved. The anaerobic tank, the anoxic tank, the aerobic tank and the membrane tank are separated by a partition wall, and a reflux pump is arranged at the partition wall, which is conducive to the sludge in the device to be gradually refluxed from the pool with high oxygen requirements to the pool with low oxygen requirements. Such an arrangement method can easily meet the requirements of the anoxic tank and the anaerobic tank for gradually reducing dissolved oxygen.

[0036] The circular AO-MBR sewage treatment device of the utility model is centered on a circular anaerobic tank or anoxic tank, and an aerobic tank and a membrane tank are arranged in sequence on the periphery. Each tank is circular or annular, so that the hydraulic conditions of each mixer are optimized and the stirring effect is improved. The anaerobic tank or anoxic tank, the aerobic tank and the membrane tank are separated by a partition wall, and a reflux pump is arranged at the partition wall, which is conducive to the sludge in the device to be gradually returned from the pool with high oxygen requirements to the pool with low oxygen requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The technical solution of the present application is further described below in conjunction with the accompanying drawings and embodiments.

[0038] Figure 1 2. It is a schematic top view of the circular AAO-MBR sewage treatment device structure of an embodiment of the present application;

[0039] Figure 2 yes Figure 1 AA cross-sectional view of a medium-circular AAO-MBR wastewater treatment plant.

[0040] The reference numerals in the figure are:

[0041] 2. Anaerobic tank;

[0042] 3. Anoxic pool;

[0043] 4. Aerobic pool;

[0044] 5. Membrane pool;

[0045] 6. First mixer;

[0046] 7. The first reflux pump;

[0047] 8. Second mixer;

[0048] 9. Second reflux pump;

[0049] 10. The third mixer;

[0050] 11. The third reflux pump;

[0051] 12. Gate;

[0052] 13. Membrane module;

[0053] 14. Water inlet pipe;

[0054] 101. First partition wall;

[0055] 102. Second partition wall;

[0056] 103. The third partition wall;

[0057] 104. Exterior wall. DETAILED DESCRIPTION

[0058] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0059] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the present utility model, unless otherwise specified, "multiple" means two or more.

[0060] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0061] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0062] This embodiment provides a circular AAO-MBR sewage treatment device, such as Figure 1 , Figure 2 As shown, including:

[0063] The anaerobic tank 2 is circular;

[0064] An anoxic tank 3 is arranged around the anaerobic tank 2, and the anoxic tank 3 is separated from the anaerobic tank 2 by a first partition wall 101;

[0065] The aerobic pool 4 is arranged around the anoxic pool 3, and the aerobic pool 4 is separated from the anoxic pool 3 by a second partition wall 102;

[0066] A membrane pool 5 is arranged around the aerobic pool 4, the membrane pool 5 is separated from the aerobic pool 4 by a third partition wall 103, and the outer side of the membrane pool 5 has an outer wall 104;

[0067] A first mixer 6 is arranged in the anaerobic tank 2 and is used to stir the sludge and water in the anaerobic tank 2;

[0068] A first reflux pump 7, installed at the first partition wall 101, for transporting the sludge in the anoxic tank 3 to the anaerobic tank 2;

[0069] A second mixer 8 is arranged in the anoxic tank 3 and is used to stir the sludge and water in the anoxic tank 3;

[0070] A second reflux pump 9, installed at the second partition wall 102, for transporting the mixed liquid in the aerobic pool 4 to the anoxic pool 3;

[0071] A third mixer 10 is arranged in the aerobic tank 4 and is used to stir the sludge and water in the aerobic tank 4;

[0072] A third reflux pump 11 is installed at the third partition wall 103 and is used to transport the mixed liquid in the membrane pool 5 to the aerobic pool 4;

[0073] The membrane assembly 13 is arranged in the membrane pool 5 and is used to intercept activated sludge and macromolecular organic matter in the membrane pool 5 .

[0074] The main function of the anaerobic tank 2 is to provide an anaerobic environment, requiring dissolved oxygen to be close to 0 mg / L, releasing phosphorus, and ammoniation of some organic matter; the phosphorus-containing sludge is pumped in by the sludge return pump, while maintaining the sludge concentration of the anaerobic tank. The anaerobic tank 2 is drained from the first partition wall 101, and the water enters the anoxic tank 3 under the action of gravity. The first return pump 7 transports the sludge in the anoxic tank 3 to the anaerobic tank 2.

[0075] The primary function of the anoxic tank 3 is to provide an anoxic environment, requiring dissolved oxygen below 0.5 mg / L, for denitrification and denitrification. Nitrate nitrogen is pumped from the aerobic tank 4 through the second reflux pump 9, while maintaining the sludge concentration in the anoxic tank 3. The anoxic tank 3 is drained from the second partition wall 102, and the water enters the aerobic tank 4 under the action of gravity. The second reflux pump 9 transports the mixed liquid in the aerobic tank 4 to the anoxic tank 3.

[0076] The aerobic pool 4 provides an aerobic environment, requiring dissolved oxygen to be above 1.0 mg / L, and multiple reactions such as removal of biochemical oxygen demand (BOD), nitrification and absorption of phosphorus are carried out in the aerobic pool 4. The aerobic pool 4 is drained from the third partition wall 103, and the water enters the membrane pool 5 under the action of gravity.

[0077] The membrane pool 5 is provided with a large-volume aeration device under the membrane assembly 13, which is in a high-oxygen state and also has the function of the aerobic pool 4; the water inlet and large-volume water return of the membrane pool 5 are continuously circulated between the aerobic pool 4 and the membrane pool 5 using the third reflux pump 11 to prevent sludge deposition and maintain the sludge concentration of the aerobic pool 4.

[0078] From outside to inside, the device comprises membrane tank 5, aerobic tank 4, anoxic tank 3 and anaerobic tank 2. The dissolved oxygen concentration of each tank is in the following order: membrane tank 5> aerobic tank 4> anoxic tank 3> anaerobic tank 2. The return order of sludge in each tank is: membrane tank 5→ aerobic tank 4→ anoxic tank 3→ anaerobic tank 2, i.e., sludge is returned step by step from the tank with high oxygen content to the tank with low oxygen content requirement. This arrangement can easily meet the requirement of the anoxic tank 3 and the anaerobic tank 2 for gradually reducing dissolved oxygen.

[0079] The circular AAO-MBR sewage treatment device of this embodiment is centered on the circular anaerobic tank 2, and the anoxic tank 3, the aerobic tank 4 and the membrane tank 5 are arranged in sequence on the periphery, so that the hydraulic conditions of each mixer are optimized and the stirring effect is improved. The anaerobic tank 2, the anoxic tank 3, the aerobic tank 4 and the membrane tank 5 are separated by a partition wall, and a reflux pump is arranged at the partition wall, which is conducive to the sludge in the device to be gradually refluxed from the pool with high oxygen requirements to the pool with low oxygen requirements. Such an arrangement can easily meet the requirements of the anoxic tank 3 and the anaerobic tank 2 for gradually reducing dissolved oxygen.

[0080] In an optional embodiment, the circular AAO-MBR sewage treatment device of this embodiment, such as Figure 1 As shown, the anaerobic tank 2, the anoxic tank 3, the aerobic tank 4 and the membrane tank 5 are all arranged concentrically. Under this structure, the circular AAO-MBR sewage treatment device of this embodiment has better structural stress, and the circular structure has the smallest floor space and low foundation treatment cost under the same volume.

[0081] In an optional embodiment, the circular AAO-MBR sewage treatment device of this embodiment, such as Figure 1 , Figure 2As shown, the first mixer 6 is a vertical paddle mixer, which is placed at the center of the anaerobic tank 2. The vertical paddle mixer can exert a good stirring effect in the center of the circular anaerobic tank 2, so that the stirring force in each direction of the anaerobic tank 2 is consistent, thereby improving the stirring effect.

[0082] In an optional embodiment, the circular AAO-MBR sewage treatment device of this embodiment, such as Figure 2 As shown, the second mixer 8 is a submersible flow propeller. It generates a strong water flow with low tangential flow, which can be used for water circulation in the pool and for creating water flow in nitrification, denitrification and dephosphorization stages.

[0083] In an optional embodiment, the circular AAO-MBR sewage treatment device of this embodiment, such as Figure 1 , Figure 2 As shown, two second mixers 8 are provided, which are evenly arranged in the center of the flow channel of the anoxic pool 3. It can be understood that the number of the second mixers 8 can also be 3, 4 or more.

[0084] In an optional embodiment, in the circular AAO-MBR sewage treatment device of this embodiment, the first reflux pump 7, the second reflux pump 9 and the third reflux pump 11 are submersible reflux pumps, which can well handle the mixed liquor reflux.

[0085] In an optional embodiment, in the circular AAO-MBR sewage treatment plant of this embodiment, the third mixer 10 is a submersible flow propeller, which generates a strong water flow with a low tangential flow, which can be used for water circulation in the pool and for creating water flow in the nitrification, denitrification and dephosphorization stages.

[0086] In an optional embodiment, the circular AAO-MBR sewage treatment device of this embodiment, such as Figure 1 As shown, the membrane pool 5 is divided into a number of cells along the circumferential direction to facilitate the maintenance of a single cell.

[0087] In an optional embodiment, the circular AAO-MBR sewage treatment device of this embodiment, such as Figure 1 As shown, the adjacent cells of the membrane pool 5 are separated by gates 12. The opening and closing of the gates 12 can facilitate the separation and connection of the cells, and facilitate water flow or maintenance of the partitions.

[0088] In an optional embodiment, the circular AAO-MBR sewage treatment device of this embodiment further includes a water inlet pipe 14, one end of which is connected to a water supply system, and the other end is connected to the anaerobic tank 2.

[0089] In an optional embodiment, the effluent of the circular AAO-MBR sewage treatment device of this embodiment is discharged to the next structure through an external suction pump.

[0090] This embodiment also provides a circular AO-MBR sewage treatment device, including an anaerobic tank 2 or an anoxic tank 3, and also includes:

[0091] an aerobic tank 4, arranged around the anaerobic tank 2 or the anoxic tank 3, wherein the aerobic tank 4 is separated from the anaerobic tank 2 or the anoxic tank 3 by a second partition wall 102;

[0092] A membrane pool 5 is arranged around the aerobic pool 4, the membrane pool 5 is separated from the aerobic pool 4 by a third partition wall 103, and the outer side of the membrane pool 5 has an outer wall 104;

[0093] A second reflux pump 9 is installed at the second partition wall 102 and is used to transport the mixed liquid in the aerobic tank 4 to the anaerobic tank 2 or the anoxic tank 3;

[0094] A third mixer 10 is arranged in the aerobic tank 4 and is used to stir the sludge and water in the aerobic tank 4;

[0095] A third reflux pump 11 is installed at the third partition wall 103 and is used to transport the mixed liquid in the membrane pool 5 to the aerobic pool 4;

[0096] The membrane assembly 13 is arranged in the membrane pool 5 and is used to intercept activated sludge and macromolecular organic matter in the membrane pool 5 .

[0097] The circular AAO-MBR sewage treatment device of the utility model is centered on a circular anaerobic tank 2 or anoxic tank 3, and an aerobic tank 4 and a membrane tank 5 are arranged in sequence on the periphery. Each tank is circular or annular, so that the hydraulic conditions of each mixer are optimized and the stirring effect is improved. The anaerobic tank 2 or anoxic tank 3, the aerobic tank 4 and the membrane tank 5 are separated by a partition wall, and a reflux pump is provided at the partition wall, which is conducive to the sludge in the device to be gradually returned from the pool with high oxygen requirements to the pool with low oxygen requirements.

[0098] Based on the above ideal embodiments of this application, the relevant staff can make various changes and modifications without departing from the technical concept of this application through the above description. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A circular AAO-MBR sewage treatment device, characterized in that: include: An anaerobic tank (2), wherein the anaerobic tank (2) is circular; An anoxic tank (3) is arranged around the anaerobic tank (2), and the anoxic tank (3) and the anaerobic tank (2) are separated by a first partition wall (101); an aerobic pool (4) arranged around the anoxic pool (3), wherein the aerobic pool (4) and the anoxic pool (3) are separated by a second partition wall (102); A membrane pool (5) is arranged around the aerobic pool (4), the membrane pool (5) and the aerobic pool (4) are separated by a third partition wall (103), and the outer side of the membrane pool (5) has an outer wall (104); A first mixer (6) is arranged in the anaerobic tank (2) and is used to stir the sludge and water in the anaerobic tank (2); A first reflux pump (7), installed at the first partition wall (101), used for transporting sludge in the anoxic tank (3) to the anaerobic tank (2); a second mixer (8), arranged in the anoxic tank (3), and used for mixing the sludge and water in the anoxic tank (3); a second reflux pump (9), installed at the second partition wall (102), and used for conveying the mixed liquid in the aerobic tank (4) to the anoxic tank (3); a third mixer (10), arranged in the aerobic tank (4), and used for stirring the sludge and water in the aerobic tank (4); a third reflux pump (11), installed at the third partition wall (103), and used for conveying the mixed liquid in the membrane tank (5) to the aerobic tank (4); The membrane assembly (13) is arranged in the membrane pool (5) and is used to intercept activated sludge and macromolecular organic matter in the membrane pool (5).

2. The circular AAO-MBR sewage treatment device according to claim 1 is characterized in that: The anaerobic tank (2), the anoxic tank (3), the aerobic tank (4) and the membrane tank (5) are all arranged concentrically.

3. The circular AAO-MBR sewage treatment device according to claim 1 is characterized in that: The first mixer (6) is a vertical paddle mixer and is placed at the center of the anaerobic tank (2).

4. The circular AAO-MBR sewage treatment device according to claim 1 is characterized in that: The second mixer (8) is a submersible flow propeller.

5. The circular AAO-MBR sewage treatment device according to claim 4 is characterized in that: The second mixer (8) is provided in plurality and is evenly arranged in the center of the flow channel of the anoxic tank (3).

6. The circular AAO-MBR sewage treatment device according to claim 1 is characterized in that: The first reflux pump (7), the second reflux pump (9) and the third reflux pump (11) are submersible reflux pumps.

7. The circular AAO-MBR sewage treatment device according to claim 1 is characterized in that: The third mixer (10) is a submersible flow propeller.

8. The circular AAO-MBR sewage treatment device according to any one of claims 1 to 7, characterized in that: The membrane pool (5) is divided into a plurality of cells along the circumferential direction.

9. The circular AAO-MBR sewage treatment device according to claim 8, characterized in that: Adjacent cells of the membrane pool (5) are separated by gates (12).

10. A circular AO-MBR sewage treatment device, comprising an anaerobic tank (2) or an anoxic tank (3), characterized in that: Also includes: an aerobic tank (4) arranged around the anaerobic tank (2) or the anoxic tank (3), wherein the aerobic tank (4) is separated from the anaerobic tank (2) or the anoxic tank (3) by a second partition wall (102); A membrane pool (5) is arranged around the aerobic pool (4), the membrane pool (5) and the aerobic pool (4) are separated by a third partition wall (103), and the outer side of the membrane pool (5) has an outer wall (104); A second reflux pump (9) installed at the second partition wall (102) and used to transport the mixed liquid in the aerobic tank (4) to the anaerobic tank (2) or the anoxic tank (3); a third mixer (10), arranged in the aerobic tank (4), and used for stirring the sludge and water in the aerobic tank (4); a third reflux pump (11), installed at the third partition wall (103), and used for conveying the mixed liquid in the membrane tank (5) to the aerobic tank (4); The membrane assembly (13) is arranged in the membrane pool (5) and is used to intercept activated sludge and macromolecular organic matter in the membrane pool (5).

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