Integrated AAO-MBR sewage treatment device

Abstract

The utility model provides an integrated AAO (anaerobic-anoxic-oxic)-MBR (membrane bioreactor) sewage treatment device which comprises a control device, and an anaerobic tank, an anoxic tank, an aerobic tank and an MBR membrane tank which are separated by a plurality of partition plates, the partition plate between the anaerobic tank and the aerobic tank is provided with a water passing port A with a regulating valve A, and the partition plate between the anoxic tank and the aerobic tank is provided with a water passing port B with a regulating valve B; the anaerobic tank is provided with a water inlet A with a water inlet valve A, and the anoxic tank is provided with a water inlet B with a water inlet valve B; the aerobic tank is communicated with the anoxic tank through a return pipe provided with a mixed liquid return pump, the anaerobic tank is communicated with the sludge return pump through a sludge return valve A and a sludge return pipe, and the anoxic tank is communicated with the sludge return pump through a sludge return valve B and a sludge return pipe. The water inlet sequence of the sewage can be controlled according to the water quality of the sewage, so that the sewage with different water qualities can be effectively treated, and the application range is effectively expanded.

Description

Technical Field

[0001] This utility model relates to an integrated AAO-MBR wastewater treatment device, belonging to the field of wastewater treatment. Background Technology

[0002] Integrated domestic wastewater treatment equipment generally adopts the AAO+MBR process, where wastewater sequentially enters an anaerobic tank, an anoxic tank, an aerobic tank, and an MBR membrane tank for nitrogen and phosphorus removal. It integrates the characteristics of traditional biological treatment technology and novel membrane separation technology, significantly reducing the size of wastewater treatment facilities while optimizing treatment efficiency. Therefore, it is widely used in wastewater treatment across various industries. However, it has the following shortcomings:

[0003] 1. Poor ability to cope with changes in water quality: The wastewater treatment sequence of the AAO+MBR process is fixed. It treats wastewater in sequence through the anaerobic tank, anoxic tank, aerobic tank, and MBR membrane tank. It cannot adjust the wastewater treatment sequence according to changes in wastewater quality. Therefore, its treatment efficiency is unstable and it is difficult to cope with various water quality changes.

[0004] 2. Limited application scenarios: Since the treatment efficiency of the AAO+MBR process is greatly affected by water quality, the application scenarios of the AAO+MBR process are limited, making it difficult to meet the wastewater treatment needs of different regions and under different water quality conditions. Utility Model Content

[0005] This invention addresses the problems existing in the prior art by providing an integrated AAO-MBR wastewater treatment device, which can control the order in which wastewater enters the anaerobic tank, anoxic tank, aerobic tank, and MBR membrane tank according to the wastewater quality, thereby effectively treating wastewater of different qualities.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] This utility model provides an integrated AAO-MBR wastewater treatment device, including a control device and an anaerobic tank, an anoxic tank, an aerobic tank, and an MBR membrane tank separated by multiple partitions.

[0008] The partition between the anaerobic tank and the aerobic tank is equipped with an inlet A with a regulating valve A; the partition between the anoxic tank and the aerobic tank is equipped with an inlet B with a regulating valve B; the partition between the anaerobic tank and the anoxic tank is equipped with an inlet C; the partition between the aerobic tank and the MBR membrane tank is equipped with an inlet D; the anaerobic tank is equipped with an inlet A with an inlet valve A; the anoxic tank is equipped with an inlet B with an inlet valve B; and the MBR membrane tank is equipped with an outlet and a sludge discharge outlet.

[0009] The aerobic tank is connected to the anoxic tank via a return pipe equipped with a mixed liquor return pump. The MBR membrane tank is equipped with a sludge return pump. The anaerobic tank is equipped with a sludge return valve A. The anoxic tank is equipped with a sludge return valve B. The sludge return pump is connected to the sludge return pipe. The anaerobic tank is connected to the sludge return pump via sludge return valve A and sludge return pipe. The anoxic tank is connected to the sludge return pump via sludge return valve B and sludge return pipe.

[0010] The control device is electrically connected to inlet valve A, inlet valve B, regulating valve A, regulating valve B, sludge return valve A, and sludge return valve B.

[0011] In one specific embodiment, the device also includes a COD sensor installed in the equalization tank and an online monitoring device installed in the clear water tank, both of which are electrically connected to the control device.

[0012] In one specific implementation, the inlet valve A and inlet valve B are electric valves.

[0013] In one specific embodiment, both the anaerobic tank and the anoxic tank are equipped with baffles.

[0014] In one specific embodiment, the aerobic tank is equipped with an aerator, which is electrically connected to a control device.

[0015] In one specific embodiment, the MBR membrane tank is equipped with an MBR membrane module and a membrane cleaning and dosing device, which is electrically connected to a control device.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] In wastewater treatment, this invention controls the opening and closing of inlet valve A, inlet valve B, regulating valve A, regulating valve B, sludge return valve A, and sludge return valve B according to the wastewater quality to control the sequence of wastewater inflow, thereby executing two processes: when the COD concentration exceeds a preset value, the AAO-MBR process is executed; when the COD concentration is not higher than the preset value, the inverted AAO-MBR process is executed to effectively treat wastewater of different qualities. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a process flow diagram of the AAO-MBR of this utility model.

[0020] Figure 3 This is a flow chart of the inverted AAO-MBR process of this utility model.

[0021] Attached diagram labels: Anaerobic tank 1, Anoxic tank 2, Aerobic tank 3, MBR membrane tank 4, Inlet valve A11, Regulating valve A12, Sludge return valve A13, Outlet C14, Baffle plate 15, Inlet valve B21, Regulating valve B22, Sludge return valve B23, Outlet D31, Aerator 32, MBR membrane module 41, Sludge discharge pipe 42, Outlet pipe 43, Sludge return pump 44, Sludge return pipe 45. Detailed Implementation

[0022] The present invention will be described in detail below with reference to the embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0023] like Figure 1 As shown, this utility model discloses an integrated AAO-MBR wastewater treatment device, including a control device and an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, and an MBR membrane tank 4 separated by multiple partitions. The partition between the anaerobic tank 1 and the aerobic tank 2 is equipped with an inlet A with a regulating valve A12; the partition between the anoxic tank 2 and the aerobic tank 3 is equipped with an inlet B with a regulating valve B22; the partition between the anaerobic tank 1 and the anoxic tank 2 is equipped with an inlet C14; and the partition between the aerobic tank 3 and the MBR membrane tank 4 is equipped with an inlet D31. The aerobic tank 1 is equipped with an inlet A with an inlet valve A11, the anoxic tank 2 is equipped with an inlet B with an inlet valve B21, and the MBR membrane tank 4 is equipped with an outlet and a sludge discharge outlet. The outlet is connected to the clear water tank via an outlet pipe 43, and the sludge discharge outlet is connected to a sludge discharge pipe 42. The aerobic tank 3 is connected to the anoxic tank 2 via a return pipe equipped with a mixed liquor return pump. Through the cooperation of the mixed liquor return pump and the return pipe, the mixed liquor in the aerobic tank 3 can be returned to the anoxic tank 2. The MBR membrane tank 4 is equipped with a sludge return pump 44, and the anaerobic tank 1 is equipped with a sludge return valve. A13, the anoxic tank 2 is equipped with a sludge return valve B23, and a sludge return pump 44 is connected to a sludge return pipe 45. The anaerobic tank 1 is connected to the sludge return pump 44 via the sludge return valve A13 and the sludge return pipe 45. The sludge from the MBR membrane tank 4 can be returned to the anaerobic tank 1 through the cooperation of the sludge return valve A13, the sludge return pipe 45, and the sludge return pump. The anoxic tank 2 is connected to the sludge return pump 44 via the sludge return valve B23 and the sludge return pipe 45. The sludge from the MBR membrane tank 4 is returned to the anaerobic tank 1 through the cooperation of the sludge return valve B23 and the sludge return pump 44. Pipe 45, in conjunction with the sludge return pump, can return the wastewater to the anoxic tank 2. The control device is electrically connected to the inlet valve A11, inlet valve B21, regulating valve A12, regulating valve B22, sludge return valve A13, and sludge return valve B23. The control device controls the opening and closing of the inlet valve A11, inlet valve B21, regulating valve A12, regulating valve B22, sludge return valve A13, and sludge return valve B23 according to the wastewater quality, thereby controlling the order in which wastewater enters the anaerobic tank 1, anoxic tank 2, aerobic tank 3, and MBR membrane tank 4.

[0024] Using the anaerobic environment created by anaerobic pond 1, polyphosphate-accumulating bacteria decompose stored polyphosphates under anaerobic conditions, releasing phosphorus, while absorbing organic matter.

[0025] Anoxic tank 2 serves as a pretreatment for the subsequent aerobic tank 3 and MBR membrane tank 4. It improves and enhances the biodegradability of wastewater to increase the rate of subsequent biochemical reactions, reduce energy consumption, and lower operating costs. Denitrification occurs in anoxic tank 2 to achieve nitrogen removal. The nitrate nitrogen from the denitrification reaction comes from aerobic tank 3. Anoxic tank 2 is equipped with packing material.

[0026] After being treated in the anaerobic tank 1 and the anoxic tank 2, the wastewater enters the aerobic tank 3. Most of the organic matter in the wastewater is degraded and purified by the microorganisms in the aerobic tank 3, and the organic matter is decomposed into inorganic salts. Organic nitrogen is ammonified and then nitrified, which significantly reduces the concentration of NH3-N. At the same time, phosphorus concentration decreases rapidly due to the excessive uptake by polyphosphate-accumulating bacteria, and the wastewater is finally purified.

[0027] Preferably, the aerobic tank 3 is equipped with an aerator 32, which is electrically connected to the control device. The oxygen in the aerobic tank 3 is provided by the aerator 32. Preferably, the aerobic tank 3 is provided with suspended packing material, which is used as a carrier for aerobic bacteria. This suspended packing material is easy to attach to a biofilm, corrosion-resistant, does not clump, does not clog, and is easy to detach from the biofilm.

[0028] After being treated in aerobic tank 3, the wastewater enters MBR membrane tank 4. In MBR membrane tank 4, microbial flocs and larger molecular organic matter in the activated sludge mixed liquor are intercepted and remain in the reactor. The biological concentration in the reactor increases, the organic solids residence time (SRT) is extended, which greatly improves the oxidation rate of organic matter by microorganisms. At the same time, the high efficiency of membrane separation greatly shortens the hydraulic residence time (HRT) of the treatment unit.

[0029] Preferably, the system also includes a COD sensor installed in the equalization tank and an online monitoring device installed in the clear water tank. Both the COD sensor and the online monitoring device are electrically connected to the control device. The COD sensor is used to detect the COD concentration of the wastewater and transmit it to the control device. The online monitoring device monitors the effluent water quality in real time to ensure that the water quality meets the discharge standards. In case of any abnormality, it can be dealt with in a timely manner.

[0030] Optionally, the inlet valve A and inlet valve B are electric valves.

[0031] Preferably, both the anaerobic tank 1 and the anoxic tank 2 are equipped with baffles 15, which can change the direction of water flow, promote the mixing of sewage and sludge, avoid the occurrence of water stagnation areas in the tank, improve the treatment efficiency of anaerobic and anoxic processes, and promote the stable operation of the sewage treatment process. Preferably, the baffles 15 are detachable for easy cleaning and maintenance.

[0032] Preferably, the baffle plate 15 in the anoxic tank is a U-shaped baffle plate, which further prolongs the retention time of wastewater, promotes the reaction of denitrifying bacteria with nitrates and organic matter, and improves the efficiency of the denitrification reaction.

[0033] The MBR membrane tank 4 is equipped with an MBR membrane module 41 and a membrane cleaning and dosing device, which is electrically connected to the control device.

[0034] When using this utility model to treat wastewater, the influent sequence of wastewater is controlled according to the wastewater quality to execute two processes. If the COD concentration is higher than the preset value, the AAO-MBR process is executed under the control of the control device. If the COD concentration is not higher than the preset value, the inverted AAO-MBR process is executed.

[0035] See Figure 2 The AAO-MBR process flow is as follows: Under the control of the control device, inlet valve A11 is opened, inlet valve B21 is closed, regulating valve A12 is closed, regulating valve A22 is opened, sludge return valve A13 is opened, and sludge return valve B23 is closed. Wastewater enters anaerobic tank 1, the effluent from anaerobic tank 1 enters anoxic tank 2, the effluent from anoxic tank 2 enters aerobic tank 3, the effluent from aerobic tank 3 enters MBR membrane tank 4, the mixed liquor from the aerobic tank is returned to anoxic tank 2 through the cooperation of the mixed liquor return pump and return pipe, some sludge is returned from MBR membrane tank 4 to anaerobic tank 1, the remaining sludge from MBR membrane tank 4 is discharged through sludge discharge pipe 42, and the effluent from MBR membrane tank 4 is discharged to the clear water tank through effluent pipe 43.

[0036] Wastewater enters anaerobic tank 1. In anaerobic tank 1, polyphosphate-accumulating bacteria (PAOs) decompose polyphosphates in their bodies and release phosphorus into the water. The wastewater then enters anoxic tank 2 for denitrification. The mixed liquor carrying nitrate nitrogen returned from aerobic tank 3 mixes with the wastewater from anaerobic tank 1 in anoxic tank 2. Denitrifying bacteria reduce nitrate nitrogen to N2, which is released into the air. The wastewater then enters aerobic tank 3 to remove organic matter and carry out nitrification. Aerobic bacteria remove organic matter from the water, while nitrifying bacteria nitrify ammonia nitrogen in the water. The wastewater is then discharged after passing through MBR membrane tank 4, with some of the returned sludge being returned to anaerobic tank 1.

[0037] See Figure 3The inverted AAO-MBR process flow is as follows: Under the control of the control device, inlet valve A11 is closed, inlet valve B21 is opened, regulating valve A12 is opened, regulating valve A22 is closed, sludge return valve A13 is closed, and sludge return valve B23 is opened. Wastewater enters anoxic tank 2, the effluent from anoxic tank 2 enters anaerobic tank 1, the effluent from anaerobic tank 1 enters aerobic tank 3, the effluent from aerobic tank 3 enters MBR membrane tank 4, the mixed liquor from aerobic tank 3 is returned to anoxic tank 2 through the cooperation of a mixed liquor return pump and return pipe, some sludge is returned from MBR membrane tank 4 to anoxic tank 2, the remaining sludge from MBR membrane tank 4 is discharged through sludge discharge pipe 42, and the effluent from MBR membrane tank 4 is discharged to clear water tank through effluent pipe 43.

[0038] The mixed liquor returned from aerobic tank 3 and the sludge returned from the MBR membrane tank both enter anoxic tank 2. Denitrification occurs in anoxic tank 2, and the denitrified wastewater then enters anaerobic tank 1. Since the wastewater at this stage does not contain nitrate nitrogen, PAOs can effectively release phosphorus. In aerobic tank 1, organic matter is degraded and ammonia nitrogen is nitrified.

[0039] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions and substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. An integrated AAO-MBR wastewater treatment device, characterized in that, It includes a control device and an anaerobic tank (1), an anoxic tank (2), an aerobic tank (3), and an MBR membrane tank (4) separated by multiple partitions; The partition between the anaerobic tank (1) and the aerobic tank (3) is provided with a water outlet A with a regulating valve A (12), the partition between the anoxic tank (2) and the aerobic tank (3) is provided with a water outlet B with a regulating valve B (22), the partition between the anaerobic tank (1) and the anoxic tank (2) is provided with a water outlet C (14), the partition between the aerobic tank (3) and the MBR membrane tank (4) is provided with a water outlet D (31), the anaerobic tank (1) is provided with a water inlet A with an inlet valve A (11), the anoxic tank (2) is provided with a water inlet B with an inlet valve B (21), and the MBR membrane tank (4) is provided with an outlet and a sludge discharge outlet. The aerobic tank (3) is connected to the anoxic tank (2) through a return pipe equipped with a mixed liquor return pump. The MBR membrane tank (4) is equipped with a sludge return pump (44). The anaerobic tank (1) is equipped with a sludge return valve A (13). The anoxic tank (2) is equipped with a sludge return valve B (23). The sludge return pump (44) is connected to the sludge return pipe (45). The anaerobic tank (1) is connected to the sludge return pump (44) through the sludge return pipe (45) via the sludge return valve A (13). The anoxic tank (2) is connected to the sludge return pump (44) through the sludge return pipe (45) via the sludge return valve B (23). The control device is electrically connected to inlet valve A (11), inlet valve B (21), regulating valve A (12), regulating valve B (22), sludge return valve A (13), and sludge return valve B (23).

2. The integrated AAO-MBR wastewater treatment device according to claim 1, characterized in that, It also includes a COD sensor installed in the equalization tank and an online monitoring device installed in the clear water tank. Both the COD sensor and the online monitoring device are electrically connected to the control device.

3. The integrated AAO-MBR wastewater treatment device according to claim 2, characterized in that, The inlet valves A and B are electric valves.

4. The integrated AAO-MBR wastewater treatment device according to claim 3, characterized in that, Both the anaerobic tank (1) and the anoxic tank (2) are equipped with baffles (15).

5. The integrated AAO-MBR wastewater treatment device according to claim 4, characterized in that, The aerobic tank (3) is equipped with an aerator (32), which is electrically connected to the control device.

6. The integrated AAO-MBR wastewater treatment device according to claim 5, characterized in that, The MBR membrane tank (4) is equipped with an MBR membrane module (41) and a membrane cleaning and dosing device, which is electrically connected to the control device.

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