MBR (Membrane Bioreactor) system applied to Maotai-flavor liquor industrial wastewater

Abstract

The utility model discloses an MBR (Membrane Biological Reactor) system applied to Maotai-flavor liquor industrial wastewater, which comprises a biochemical system sludge primary sedimentation tank, a membrane tank, an MBR membrane group, a water diversion tank, a water production pump, a clean water tank and a backwashing water tank, the membrane tank is arranged at the rear end of the biochemical system sludge primary sedimentation tank, the bottom of the membrane tank is communicated with a first aeration pipe, the other end of the first aeration pipe is communicated with an aeration system, and the aeration system is communicated with a second aeration pipe. An MBR membrane group is arranged in the middle of the membrane pool, a water diversion tank and a water producing pump are sequentially arranged at the top of the MBR membrane group through a water conveying pipeline, the other end of the water producing pump is communicated with a water outlet main pipeline, the water outlet main pipeline is divided into a first branch pipeline and a second branch pipeline, and a membrane online chemical cleaning system is arranged on one side of the backwashing pool. The utility model aims to effectively reduce the inlet water CODcr of the rear-end advanced oxidation process and realize the reduction of the rear-end advanced oxidation cost, and has the advantages of low working intensity of operators, high water treatment efficiency and long-term stable operation, thereby laying a solid foundation for the final up-to-standard discharge of wastewater.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, specifically to an MBR system for treating industrial wastewater from Maotai-flavor liquor. Background Technology

[0002] In recent years, with the rapid development of the liquor industry, the environmental problems it brings have become increasingly serious. Wastewater from Maotai-flavor liquor production generally exhibits high levels of suspended solids, organic matter, nitrogen, phosphorus, and color, with COD influent concentrations consistently exceeding 80,000 mg / L. Typical designs employ physicochemical pretreatment methods, primarily using anaerobic and aerobic biological treatment, supplemented by chemical post-treatment and membrane separation in a multi-stage series process to achieve compliant discharge. However, due to the poor biodegradability of Maotai-flavor liquor wastewater, even after advanced oxidation, organic matter cannot be completely removed. Further treatment with Fenton or other advanced oxidation processes is insufficient to ensure compliant discharge, and significantly increases chemical dosage and sludge production, resulting in extremely high operating costs. Currently, the industry generally attempts to add physical interception membrane separation before the advanced oxidation or deep treatment stages. However, for this type of wastewater treatment, membrane separation methods often struggle to operate stably in the long term and cannot effectively reduce the influent COD of the downstream advanced oxidation process. cr It is difficult to operate, has high operating costs, and low water treatment efficiency. Utility Model Content

[0003] In view of the shortcomings of the prior art mentioned above, the purpose of this utility model is to effectively reduce the COD of the influent to the downstream advanced oxidation process. cr This reduces the cost of advanced oxidation at the back end, while also reducing the workload for operators, increasing water treatment efficiency, and enabling long-term stable operation, thus laying a solid foundation for achieving the final wastewater discharge standards.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] An MBR system for treating industrial wastewater from Maotai-flavor liquor production includes a primary sedimentation tank for sludge, a membrane tank, an MBR membrane module, a water inlet tank, a permeate pump, a clear water tank, and a backwash water tank. The membrane tank is located at the rear end of the primary sedimentation tank. A sludge return pump is installed at the bottom of the membrane tank, and a first aeration pipe is connected to the bottom of the membrane tank. The other end of the first aeration pipe is connected to an aeration system. An MBR membrane module is located in the middle of the membrane tank, and a second aeration pipe is connected to the bottom of the MBR membrane module. The second aeration pipe is connected to the aeration system. A water inlet tank and a permeate pump are sequentially installed at the top of the MBR membrane module via a water supply pipe. The water outlet pipe of the water inlet tank is located on the lower side of the tank and connected to the permeate pump. The other end of the permeate pump is connected to a main effluent pipe, which is divided into a first branch pipe and a second branch pipe. The first branch pipe is connected to the backwash water tank, and the second branch pipe is connected to the clear water tank. An online chemical cleaning system for the membrane is installed on one side of the backwash water tank.

[0006] As a further embodiment of this utility model, the membrane online chemical cleaning system includes a backwash water pump, a security filter, an acid tank, an alkali tank, and a metering pump. One side of the backwash water tank is connected to the security filter via the backwash water pump, and the other end of the security filter is connected to the MBR membrane module via a backwash pipeline. The acid tank and the alkali tank are respectively connected to the backwash pipeline via metering pumps.

[0007] As a further embodiment of this utility model, the top of the water tank is provided with a second electromagnetic pneumatic valve and an external pipe connected to the membrane tank.

[0008] As a further embodiment of this utility model, a third electromagnetic pneumatic valve, a second flow meter, and a second pressure gauge are sequentially installed on the backwashing pipeline between the security filter and the MBR membrane module.

[0009] As a further embodiment of this utility model, a first electromagnetic pneumatic valve is provided on the outlet pipe between the water tank and the water pump.

[0010] As a further embodiment of this utility model, a first flow meter and a first pressure meter are sequentially installed on the main water outlet pipe.

[0011] As a further embodiment of this invention, a first level gauge is provided at the top of the membrane tank.

[0012] As a further embodiment of this utility model, a seventh electromagnetic pneumatic valve is provided on the first aeration pipe.

[0013] As a further embodiment of this utility model, a fourth electromagnetic pneumatic valve is installed on the first branch pipe between the product water pump and the backwash water tank, a second level gauge is installed on the top of the backwash water tank, a fifth electromagnetic pneumatic valve is installed on the second branch pipe between the product water pump and the clear water tank, and a third level gauge is installed on the top of the clear water tank.

[0014] As a further embodiment of this utility model, a sixth electromagnetic pneumatic valve is provided on the second aeration pipe.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] During wastewater treatment, the intake tank is full of water. The first electromagnetic pneumatic valve is opened, the second and third electromagnetic pneumatic valves are closed, and the permeate pump is started. The permeate pump draws water from the intake tank, creating negative pressure inside the tank and the MBR membrane module to separate the wastewater from the membrane in the membrane tank. The permeate flows from the membrane tank through the MBR membrane module, the intake tank, and the permeate pump to the clear water tank or backwash water tank. The clear water entering the clear water tank is pumped to the downstream advanced oxidation treatment facility. The wastewater enters the backwash water tank and then enters the membrane online chemical cleaning system. The security filter performs precision filtration of the water in the backwash water tank. During backwashing, the first and second electromagnetic pneumatic valves are closed, the third electromagnetic pneumatic valve is opened, and the backwash pump is started. The water in the backwash water tank flows through the backwash pump and the security filter to the MBR membrane module for backwashing. The acid and alkali cleaning solutions in the acid and alkali tanks are injected into the backwash pipeline separately at different times through metering pumps to perform online chemical cleaning of the MBR membrane module. This invention can effectively reduce the COD of the influent to the downstream advanced oxidation process. cr This reduces the cost of advanced oxidation at the back end, while also reducing the workload for operators, increasing water treatment efficiency, and enabling long-term stable operation, thus laying a solid foundation for achieving the final wastewater discharge standards. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] In the diagram: 11-Membrane tank; 12-MBR membrane module; 17-Sludge return pump; 21-Inlet tank; 22-Permeate pump; 23-Clear water tank; 31-Backwash water tank; 32-Backwash water pump; 33-Security filter; 34a-Acid tank; 34b-Alkali tank; 35-Metering pump; 41-Aeration system; 42a-First aeration pipe; 42b-Second aeration pipe; 52a-First electromagnetic pneumatic valve; 52b-Second electromagnetic pneumatic valve; 52c-Third electromagnetic pneumatic valve; 52d-Fourth electromagnetic pneumatic valve; 52e-Fifth electromagnetic pneumatic valve; 52f-Sixth electromagnetic pneumatic valve; 52g-Seventh electromagnetic pneumatic valve; 53a-First flow meter; 53b-Second flow meter; 54a-First pressure gauge; 54b-Second pressure gauge; 55a-First level gauge; 55b-Second level gauge; 55c-Third level gauge. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "middle," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Please see the appendix Figure 1A bioreactor (MBR) system for treating industrial wastewater from a sauce-flavored liquor production facility includes a primary sedimentation tank for sludge, a membrane tank 11, an MBR membrane module 12, a water inlet tank 21, a product water pump 22, a clear water tank 23, and a backwash water tank 31. The membrane tank 11 is located at the rear end of the primary sedimentation tank. A first aeration pipe 42a is connected to the middle of the membrane tank 11, and a seventh electromagnetic pneumatic valve 52g is installed on the first aeration pipe 42a. The other end of the first aeration pipe 42a is connected to an aeration system 41. The MBR membrane module 12 is located in the middle of the membrane tank 11, and a second aeration pipe 42b is connected to the bottom of the MBR membrane module 12. A second aeration pipe 42b is installed on the second aeration pipe 42b. The sixth electromagnetic pneumatic valve 52f and the second aeration pipe 42b are connected to the aeration system 41. The top of the MBR membrane module 12 is equipped with a water inlet tank 21 and a product water pump 22 in sequence through a water supply pipe. The water outlet pipe of the water inlet tank 21 is located on the lower side of the tank body and is connected to the product water pump 22. The other end of the product water pump 22 is connected to the main water outlet pipe. The main water outlet pipe is divided into a first branch pipe and a second branch pipe. The first branch pipe is connected to the backwash water tank 31, and the second branch pipe is connected to the clear water tank 23. The water in the clear water tank 23 is pumped to the downstream advanced oxidation treatment facility. An online chemical cleaning system for the membrane is installed on one side of the backwash water tank 31.

[0023] The bottom of the membrane tank 11 is equipped with a sludge return pump 17, which can return the sediment at the bottom of the membrane tank 11 to the front-end biological system. The first aeration pipe 42a aerates the membrane tank 11 at regular intervals to promote the flow of sludge at the bottom of the membrane tank 11 while preventing sludge anaerobic oxidation from affecting the membrane separation effect and effluent indicators. The top of the membrane tank 11 is equipped with a first liquid level gauge 55a, which monitors the liquid level and interlocks the operation of the sludge return pump 17 to adjust the water inlet of the tank. The bottom of the MBR membrane module 12 is connected to the aeration system 41 and the second aeration pipe 42b to disturb and wash the membrane, thereby slowing down the rate at which pollutants in the water adhere to the surface of the MBR membrane module 12.

[0024] The membrane online chemical cleaning system includes a backwash water pump 32, a security filter 33, an acid tank 34a, an alkali tank 34b, and a metering pump 35. One side of the backwash water tank 31 is connected to the security filter 33 via the backwash water pump 32, and the other end of the security filter 33 is connected to the MBR membrane module 12 via a backwash pipeline. The acid tank 34a and the alkali tank 34b are respectively connected to the backwash pipeline via the metering pump 35.

[0025] The security filter 33 performs precision filtration of the water in the backwash tank 31. During backwashing, the first electromagnetic pneumatic valve 52a and the second electromagnetic pneumatic valve 52b are closed, the third electromagnetic pneumatic valve 52c is opened, and the backwash pump 32 is started via the external PLC control system. The water in the backwash tank 31 flows through the backwash pump 32 and the security filter 33 to the MBR membrane module 12 for backwashing. The acid and alkali solutions in the acid tank 34a and alkali tank 34b are injected into the backwash pipeline separately at different times via the metering pump 35 to perform online chemical cleaning of the MBR membrane module 12. During backwashing of the MBR membrane module 12, the second electromagnetic pneumatic valve 52b is briefly opened to vent air, filling the water tank 21 with water before being closed. During water production, the product water pump 22 pumps water from the water tank 21 to create negative pressure inside the tank and the MBR membrane module 12, separating the wastewater membrane in the membrane tank 11.

[0026] The top of the water tank 21 is equipped with a second electromagnetic pneumatic valve 52b and an external pipe connected to the membrane tank 11. The backwashing pipeline between the security filter 33 and the MBR membrane module 12 is sequentially equipped with a third electromagnetic pneumatic valve 52c, a second flow meter 53b, and a second pressure gauge 54b.

[0027] A first flow meter 53a and a first pressure meter 54a are sequentially installed on the main outlet pipe. The first flow meter 53a and the first pressure meter 54a monitor the operation of the equipment, while the second flow meter 53b and the second pressure meter 54b provide feedback on the fouling level of the MBR membrane module 12. When the backwash flow rate is low, especially when the backwash pressure reaches a certain value, online chemical cleaning must be performed. During online chemical cleaning, the aeration system 41 is stopped or the first electromagnetic pneumatic valve 52a and the second electromagnetic pneumatic valve 52b are closed.

[0028] During water production, the water inlet tank 21 is full of water. The PLC control system opens the first electromagnetic pneumatic valve 52a, closes the second electromagnetic pneumatic valves 52b and 52c, and starts the water production pump 22. The water production flows from the membrane tank 11 through the MBR membrane module 12, the water inlet tank 21, and the water production pump 22 to the clear water tank 23 or the backwash water tank 31.

[0029] A first electromagnetic pneumatic valve 52a is installed on the outlet pipe between the water inlet tank 21 and the product water pump 22. The aeration system 41 controls the aeration of the aeration pipes 42a and 42b respectively by the operation of the first electromagnetic pneumatic valve 52a and the second electromagnetic pneumatic valve 52b.

[0030] A fourth electromagnetic pneumatic valve 52d is installed on the first branch pipe between the product water pump 22 and the backwash water tank 31. A second level gauge 55b is installed on the top of the backwash water tank 31. A fifth electromagnetic pneumatic valve 52e is installed on the second branch pipe between the product water pump 22 and the clear water tank 23. A third level gauge 55c is installed on the top of the clear water tank 23.

[0031] The third level gauge 55c monitors the liquid level and interlocks the fifth solenoid valve 52e to adjust the liquid level in the clear water tank 23. When the liquid level in the clear water tank 23 reaches the upper limit of the set value, the fifth solenoid valve 52e of the water inlet pipe of the clear water tank 23 is closed to stop water intake. When the liquid level in the clear water tank 23 reaches the lower limit of the set value, the fifth solenoid valve 52e of the water inlet pipe of the clear water tank 23 is opened to allow water intake.

[0032] When the liquid level in the backwash water tank 31 reaches the upper limit of the set value, the fourth electromagnetic pneumatic valve 52d of the first branch pipe of the backwash water tank 31 is closed to stop the water intake. When the liquid level in the backwash water tank 31 reaches the lower limit of the set value, the fourth electromagnetic pneumatic valve 52d of the water inlet pipe of the backwash water tank 31 is opened to allow water to enter.

[0033] In the wastewater treatment process, the overflow clear liquid from the primary sedimentation tank flows into the membrane tank 11. The sludge return pump 17 installed at the bottom of the membrane tank 11 returns the sedimented sludge to the upstream biological system. This system is externally connected to a PLC control system. During water production, the water inlet tank 21 is full. The PLC control system opens the first electromagnetic pneumatic valve 52a, closes the second electromagnetic pneumatic valve 52b and the third electromagnetic pneumatic valve 52c, and starts the water production pump 22. The water production pump 22 pumps water from the water inlet tank 21, creating a negative pressure inside the tank and the MBR membrane module 12, separating the wastewater from the membrane in the membrane tank 11. The produced water flows from the membrane tank 11 through the MBR membrane module 12, the water inlet tank 21, and the water production pump 22 to the clear water tank 23 or the backwash water tank 31. Water entering the clear water tank 23 is pumped to the downstream advanced oxidation treatment facility. Wastewater enters the backwash water tank 31 and then the membrane online chemical cleaning system. The security filter 33 performs precision filtration of the water in the backwash water tank 31. During backwashing, the PLC control system closes the first electromagnetic pneumatic valve 52a and the second electromagnetic pneumatic valve 52b, opens the third electromagnetic pneumatic valve 52c, and starts the backwash pump 32. The water in the backwash water tank 31 flows through the backwash pump 32 and the security filter 33 to the MBR membrane module 12 for backwashing. The acid and alkali solutions in the acid tank 34a and alkali tank 34b are injected into the backwash pipeline separately at different times through the metering pump 35 to perform online chemical cleaning of the MBR membrane module 12. This system can effectively reduce the COD of the influent to the downstream advanced oxidation process. cr This reduces the cost of advanced oxidation at the back end, while also reducing the workload for operators, increasing water treatment efficiency, and enabling long-term stable operation, thus laying a solid foundation for achieving the final wastewater discharge standards.

[0034] Finally, it should be noted that the MBR membrane module, acid tank 34a, alkali tank 34b, PLC control system and other components involved in this utility model are all general standard parts or components known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the spare parts of this device, all the above-mentioned electrical components, which refer to power elements, electrical components and the matching controller and power supply, are connected by wires. The specific connection method should refer to the working principle of this utility model. The electrical connection between each electrical component is completed in the order of operation. The detailed connection method is a technology known in the art.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An MBR system for treating industrial wastewater from Maotai-flavor liquor production, characterized in that, The system includes a primary sludge settling tank, a membrane tank (11), an MBR membrane module (12), a water inlet tank (21), a permeate pump (22), a clear water tank (23), and a backwash water tank (31). The membrane tank (11) is located at the rear end of the primary sludge settling tank. A sludge return pump (17) is installed at the bottom of the membrane tank (11). A first aeration pipe (42a) is connected to the bottom of the membrane tank (11), and the other end of the first aeration pipe (42a) is connected to an aeration system (41). An MBR membrane module (12) is installed in the middle of the membrane tank (11), and a second aeration pipe (42b) is connected to the bottom of the MBR membrane module (12). The second aeration pipe (42b) is connected to the aeration system (41). The top of the MBR membrane module (12) is equipped with a water inlet tank (21) and a product water pump (22) in sequence through a water supply pipe. The water outlet pipe of the water inlet tank (21) is located on the lower side of the tank body and is connected to the product water pump (22). The other end of the product water pump (22) is connected to the main water outlet pipe. The main water outlet pipe is divided into a first branch pipe and a second branch pipe. The first branch pipe is connected to the backwash water tank (31), and the second branch pipe is connected to the clear water tank (23). An online chemical cleaning system for the membrane is provided on one side of the backwash water tank (31).

2. The MBR system for treating industrial wastewater from Maotai-flavor liquor as described in claim 1, characterized in that, The membrane online chemical cleaning system includes a backwash water pump (32), a security filter (33), an acid tank (34a), an alkali tank (34b), and a metering pump (35). One side of the backwash water tank (31) is connected to the security filter (33) through the backwash water pump (32), and the other end of the security filter (33) is connected to the MBR membrane module (12) through a backwash pipeline. The acid tank (34a) and the alkali tank (34b) are respectively connected to the backwash pipeline through the metering pump (35).

3. The MBR system for treating industrial wastewater from Maotai-flavor liquor production according to claim 1, characterized in that, The top of the water tank (21) is equipped with a second electromagnetic pneumatic valve (52b) and an external pipe is connected to the membrane tank (11).

4. The MBR system for treating industrial wastewater from Maotai-flavor liquor as described in claim 2, characterized in that, A third electromagnetic pneumatic valve (52c), a second flow meter (53b), and a second pressure gauge (54b) are sequentially installed on the backwash line between the security filter (33) and the MBR membrane module (12).

5. The MBR system for treating industrial wastewater from soy sauce-flavored liquor production according to claim 1, characterized in that, A first electromagnetic pneumatic valve (52a) is installed on the outlet pipe between the water tank (21) and the water pump (22).

6. The MBR system for treating industrial wastewater from Maotai-flavor liquor production according to claim 1, characterized in that, The main outlet pipe is equipped with a first flow meter (53a) and a first pressure meter (54a) in sequence.

7. The MBR system for treating industrial wastewater from Maotai-flavor liquor production according to claim 1, characterized in that, A first level gauge (55a) is installed at the top of the membrane tank (11).

8. The MBR system for treating industrial wastewater from Maotai-flavor liquor production according to claim 1, characterized in that, A seventh electromagnetic pneumatic valve (52g) is provided on the first aeration pipe (42a).

9. The MBR system for treating industrial wastewater from soy sauce-flavored liquor production according to claim 1, characterized in that, A fourth electromagnetic pneumatic valve (52d) is installed on the first branch pipe between the product water pump (22) and the backwash water tank (31). A second level gauge (55b) is installed on the top of the backwash water tank (31). A fifth electromagnetic pneumatic valve (52e) is installed on the second branch pipe between the product water pump (22) and the clear water tank (23). A third level gauge (55c) is installed on the top of the clear water tank (23).

10. The MBR system for treating industrial wastewater from Maotai-flavor liquor production according to claim 1, characterized in that, The second aeration pipe (42b) is equipped with a sixth electromagnetic pneumatic valve (52f).

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