Multi-series MBR device with self-backwashing function
By employing mutual backwashing between adjacent membrane modules in multi-series MBR units, the problems of complex backwashing control and high footprint cost in traditional MBR systems are solved, achieving efficient backwashing and simplified operation, and reducing system costs.
Patent Information
- Application Number
- CN202422954124.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Traditional MBR systems have complex backwashing control in multiple series of units, which is prone to errors and increases system investment and land costs, especially in projects with limited land.
Multi-series MBR units with self-backwashing function use the permeate system for backwashing through mutual backwashing between adjacent membrane modules, eliminating the need for additional backwash pumps and flushing tanks, thus simplifying control logic and piping design.
It achieves efficient backwashing, reduces system investment and land costs, simplifies operating procedures, and improves the overall water production efficiency of the system.
Smart Images
Figure CN223534926U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, specifically to a multi-series MBR device with self-backwashing function. Background Technology
[0002] MBR, also known as Membrane Bio-Reactor, is a water treatment technology that combines membrane separation units with biological treatment units. Due to its excellent and stable effluent quality, small footprint, strong resistance to fouling, and convenient maintenance, it has now replaced traditional secondary sedimentation tanks and is widely used in wastewater treatment systems of various sizes.
[0003] Traditional MBR systems typically operate in a "9-minute production, 1-minute shutdown" or "8-minute production, 2-minute shutdown" mode. This means that every 9 or 8 minutes of operation, the system needs to be stopped for 1 or 2 minutes to implement a relaxation mode, preventing further fouling of the membrane surface caused by prolonged continuous operation. With continuous innovation in MBR technology, backwashing has been incorporated into the MBR system control. During the 1-2 minutes of relaxation, reverse water flow into the permeate pipe flushes the membrane fibers from the inside out, removing contaminants adhering to the outer surface and further improving the operational stability of the MBR membrane system.
[0004] Existing backwashing systems typically include a flushing water tank, backwash pump, automatic valve, and corresponding piping. When a membrane system comprises multiple MBR units, if a shared backwash pump is used, each unit needs to queue for backwashing control, resulting in complex control logic. Errors in the program or human error can easily lead to prolonged continuous operation of a single unit, damaging the membrane elements. Conversely, installing an independent backwash pump for each unit significantly increases system investment costs. Furthermore, the flushing water tank, backwash pump, and their associated piping systems occupy a large area. For projects with limited land, especially underground wastewater treatment plants, the presence of these components often poses significant challenges to system layout. Summary of the Invention
[0005] To solve the above-mentioned technical problems, this utility model provides a multi-series MBR device with self-backwashing function.
[0006] The technical solution adopted in this utility model is:
[0007] A multi-series MBR unit with self-backwashing function includes an MBR membrane filtration system, an aeration system, a permeate system, and a backwashing system. The MBR membrane filtration system includes at least one set of MBR membrane reactors, wherein the set of MBR membrane reactors includes an A-series membrane tank and A-series membrane modules disposed within the A-series membrane tank, and a B-series membrane tank and B-series membrane modules disposed within the B-series membrane tank. The aeration system is used for continuous aeration and scrubbing of all membrane modules in the MBR membrane filtration system. The permeate system and backwashing system are configured in conjunction for the discharge of permeate from one set of membrane modules and the backwashing system. Backwashing; the permeate system includes an A-series permeate system and a B-series permeate system; when the MBR membrane filtration system is in permeate mode, the A-series and B-series membrane modules discharge water to the outside of the system through the A-series and B-series permeate systems respectively, and the backwashing system stops operating at this time; when the A-series or B-series membrane modules need to be backwashed, the permeate system stops discharging water, the membrane module that needs to be backwashed stops producing water, and the other membrane module executes permeate mode. The permeate from the membrane module in permeate mode enters the membrane module that needs to be backwashed through the backwashing system to backwash it. Furthermore, the A-series permeate system includes an A-series permeate pump, an A-series automatic permeate valve, and an A-series permeate branch pipe; the B-series permeate system includes a B-series permeate pump, a B-series automatic permeate valve, and a B-series permeate branch pipe. The A-series membrane module is connected to the inlet of the A-series permeate pump via the A-series permeate branch pipe and the A-series automatic permeate valve; the B-series membrane module is connected to the inlet of the B-series permeate pump via the B-series permeate branch pipe and the B-series automatic permeate valve. The outlets of both the A-series and B-series permeate pumps are connected to the inlet of the external discharge pipeline, and the outlet of the external discharge pipeline is equipped with an automatic drain valve.
[0008] Furthermore, the backwashing system includes a backwashing pipeline, a backwashing switching valve, an A-series automatic backwashing valve, and a B-series automatic backwashing valve; the backwashing pipeline is connected to the inlet end of the A-series product water branch pipe, the B-series product water branch pipe, and the external discharge pipeline through the A-series automatic backwashing valve, the B-series automatic backwashing valve, and the backwashing switching valve, respectively.
[0009] Furthermore, an A-series permeate hand valve is installed on the A-series permeate branch pipe near the outlet of the A-series membrane module, and the backwash pipeline is connected between the A-series permeate hand valve and the A-series permeate automatic valve.
[0010] Furthermore, a B-series permeate hand valve is installed on the B-series permeate branch pipe near the outlet of the B-series membrane module, and the backwash pipeline is connected between the B-series permeate hand valve and the B-series permeate automatic valve.
[0011] Furthermore, both the A-series and B-series water pumps are equipped with check valves at their outlets.
[0012] Further, the aeration system includes a scrubbing fan, a scrubbing aeration pipeline, scrubbing aeration branch pipes provided corresponding to each series of membrane modules one by one, and scrubbing aeration manual valves provided on each scrubbing aeration branch pipe. The scrubbing fan is connected to each series of membrane modules through the scrubbing aeration pipeline, the scrubbing aeration branch pipes and the scrubbing aeration manual valves.
[0013] Advantages of the present utility model:
[0014] 1. By using adjacent series of membrane modules in the multi-series MBR system to pair up and wash each other, there is no need to additionally equip a backwashing pump and a flushing water tank, saving floor space and investment costs. The control program is simple, the backwashing efficiency is higher, and the overall water production efficiency of the system is improved.
[0015] 2. Greatly simplifies the design of the backwashing pipeline in the traditional MBR system. The backwashing pipeline is only arranged between the water production pipelines of adjacent two series, without a backwashing main pipe, improving the overall operability of the system. Description of the drawings
[0016] Figure 1 is a schematic structural diagram of a multi-series MBR device with a self-backwashing function according to the present invention.
[0017] Figure 2 is a pump-valve state diagram of the multi-series MBR device according to the present invention in the water production mode.
[0018] Figure 3 is a pump-valve state diagram of the multi-series MBR device according to the present invention when the A-series membrane module is in the backwashing state.
[0019] Figure 4 is a pump-valve state diagram of the multi-series MBR device according to the present invention when the B-series membrane module is in the backwashing state. Detailed implementation manners
[0020] To make the purpose, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the drawings and a preferred implementation manner.
[0021] Refer to Figure 1 , a multi-series MBR device with a self-backwashing function, which consists of a membrane filtration system composed of two groups of A / B series MBR membrane reactors, a scrubbing aeration system, a water production system and a backwashing system that are配套设置 with the membrane filtration system.
[0022] The A-series MBR membrane reactor includes an A-series membrane tank 11a and A-series membrane modules 12a arranged in the A-series membrane tank. The B-series MBR membrane reactor includes a B-series membrane tank 11b and B-series membrane modules 12b arranged in the B-series membrane tank.
[0023] It should be noted that the expression "配套设置" in the original text is not very clear in meaning. A more accurate expression might be "configured correspondingly" or "set up in a matching manner". The above translation is based on the literal meaning. If there is a more specific context to determine the exact meaning, the translation can be further optimized.The scrubbing aeration system includes a scrubbing blower 21, a scrubbing aeration pipeline 23, scrubbing aeration branch pipes, and scrubbing aeration manual valves. The scrubbing blower is connected to the A-series membrane module 12a and the B-series membrane module 12b respectively through the scrubbing aeration pipeline 23, the scrubbing aeration branch pipes, and the first scrubbing aeration manual valve 22a and the second scrubbing aeration manual valve 22b. Air is delivered to the membrane module through the scrubbing aeration pipeline 23 for scrubbing aeration, reducing the dirt adhering to the outside of the membrane fibers in the membrane module, and the scrubbing aeration manual valves are used for on / off control.
[0024] The product water system includes an A-series product water pump 31a, an A-series product water manual valve 32a, an A-series product water automatic valve 33a, an A-series product water branch pipe 34a, a B-series product water pump 31b, a B-series product water manual valve 32b, a B-series product water automatic valve 33b, a B-series product water branch pipe 34b, an automatic drain valve 35, and an external discharge pipe 36. The product water manual valve is used to disconnect the membrane module from the product water branch pipe during maintenance; it is normally open during system operation.
[0025] The A-series permeate pump 31a is connected to the A-series membrane module 12a via the A-series permeate branch pipe 34a, the A-series automatic permeate valve 33a, and the A-series manual permeate valve 32a. The B-series permeate pump 31b is connected to the B-series membrane module 12b via the B-series permeate branch pipe 34b, the B-series automatic permeate valve 33b, and the B-series manual permeate valve 32b. The outlets of both the A-series and B-series permeate pumps 31a and 31b are connected to the inlet of the discharge pipe 36, and the outlet of the discharge pipe 36 is equipped with an automatic drain valve 35.
[0026] The backwash system includes a backwash pipeline 41, a backwash switching valve 42, an A-series backwash automatic valve 43a, and a B-series backwash automatic valve 43b. The backwash pipeline 41 is formed by connecting the first backwash pipeline 41a and the second backwash pipeline 41b through a tee. One end of the first backwash pipeline 41a is connected to the A-series water production branch pipe 34a between the A-series water production manual valve and the A-series water production automatic valve through the A-series backwash automatic valve 43a, and the other end is connected to the B-series water production branch pipe 34b between the B-series water production manual valve and the B-series water production automatic valve through the B-series backwash automatic valve 43b. The other end of the second backwash pipeline 41b is connected to the inlet end of the drain pipeline 36 through the backwash switching valve 42.
[0027] Both the A-series product water pump 31a and the B-series product water pump 31b are equipped with check valves at their outlets to prevent product water or backwash water from flowing back into the product water pump.
[0028] The working principle of this utility model is as follows:
[0029] See Figure 2When the system is in permeate mode, after the incoming water enters the A / B series membrane tank, the permeate system uses negative pressure to draw the membrane modules in the tank, and the wastewater passes through the membrane filtration to obtain clean permeate. At the same time, the scrubbing and aeration system continuously scrubs and aerates the membrane modules to reduce the dirt adhering to the outside of the membrane fibers and ensure the stable operation of the membrane system. The A / B series MBR membrane reactors use their respective permeate pumps to draw the clean permeate filtered by the membrane modules through the permeate manual valve and the permeate automatic valve into the permeate branch pipe. The permeate in the permeate branch pipe is discharged through the drainage automatic valve and the external discharge pipeline. At this time, all valves in the backwash system are in the closed state.
[0030] See Figure 3 and Figure 4 When the system is in permeate mode, and the A-series membrane module needs to perform a backwash operation, first stop the A-series permeate pump 31a, then close the A-series permeate automatic valve 33a, open the backwash switching valve 42 and the A-series backwash automatic valve 43a, and finally close the drain automatic valve 35. At this time, the B-series permeate flows through the backwash switching valve 42 and the backwash pipeline 41, through the A-series backwash automatic valve 43a, and enters the A-series permeate membrane module 12a, so as to achieve the purpose of using the B-series permeate to backwash the A-series membrane module 12a.
[0031] After the A-series backwash is complete, first stop the B-series permeate pump 31b, then close the B-series permeate automatic valve 33b and the A-series backwash automatic valve 43a, open the A-series permeate automatic valve 33a and the B-series backwash automatic valve 43b, and finally start the A-series permeate pump 31a. At this time, the A-series permeate flows through the backwash switching valve 42 and the backwash pipeline 41, through the B-series backwash automatic valve 43b, and enters the B-series permeate membrane module 12b, thus achieving the purpose of using the A-series permeate for backwashing the B-series membrane module 12b. At this point, one round of mutual backwashing between the two series is completed, and the system returns to permeate mode, repeating this cycle.
[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also within the protection scope of the present utility model.
Claims
1. A multi-series MBR device with self-backwashing function, characterized in that, Includes MBR membrane filtration system, aeration system, product water system and backwashing system, The MBR membrane filtration system includes at least one set of MBR membrane reactors, the set of MBR membrane reactors including an A series membrane tank (11a) and an A series membrane module (12a) disposed in the A series membrane tank, and a B series membrane tank (11b) and a B series membrane module (12b) disposed in the B series membrane tank. The aeration system is used to continuously aerate and clean all membrane modules in the MBR membrane filtration system. The permeate system and backwashing system are set up together for permeate discharge and membrane backwashing of a set of membrane modules; the permeate system includes the A series permeate system and the B series permeate system; When the MBR membrane filtration system is in permeate mode, the A-series membrane module (12a) and the B-series membrane module (12b) discharge water to the outside of the system through the A-series permeate system and the B-series permeate system, respectively. At this time, the backwashing system stops operating. When the A-series membrane module (12a) or the B-series membrane module (12b) needs to be backwashed, the permeate system stops discharging water to the outside, the membrane module that needs to be backwashed stops producing water, and the other membrane module executes permeate mode. The permeate from the membrane module in permeate mode enters the membrane module that needs to be backwashed through the backwashing system to backwash it.
2. A multi-series MBR device with self-backwashing function according to claim 1, characterized in that, The A-series water production system includes an A-series water production pump (31a), an A-series water production automatic valve (33a), and an A-series water production branch pipe (34a). The B-series water production system includes a B-series water production pump (31b), a B-series water production automatic valve (33b), and a B-series water production branch pipe (34b). The A-series membrane module (12a) is connected to the inlet of the A-series water production pump (31a) via the A-series water production branch pipe (34a) and the A-series water production automatic valve (33a). The B-series membrane module (12b) is connected to the inlet of the B-series water production pump (31b) via the B-series water production branch pipe (34b) and the B-series water production automatic valve (33b). The outlet of the A-series water production pump (31a) and the outlet of the B-series water production pump (31b) are both connected to the inlet of the external discharge pipeline (36). The outlet of the external discharge pipeline (36) is equipped with an automatic drain valve (35).
3. A multi-series MBR device with self-backwashing function according to claim 2, characterized in that, The backwashing system includes a backwashing pipeline (41), a backwashing switching valve (42), an A-series backwashing automatic valve (43a), and a B-series backwashing automatic valve (43b). The backwashing pipeline (41) is connected to the inlet of the A-series product water branch pipe (34a), the B-series product water branch pipe (34b), and the external discharge pipeline (36) through the A-series backwashing automatic valve (43a), the B-series backwashing automatic valve (43b), and the backwashing switching valve (42), respectively.
4. A multi-series MBR device with self-backwashing function according to claim 1, characterized in that, An A-series permeate branch pipe (34a) near the outlet of the A-series membrane module (12a) is equipped with an A-series permeate manual valve (32a), and a backwash line (41) is connected between the A-series permeate manual valve (32a) and the A-series permeate automatic valve (33a).
5. A multi-series MBR device with self-backwashing function according to claim 1, characterized in that, A B-series permeate branch pipe (34b) near the outlet of the B-series membrane module (12b) is equipped with a B-series permeate manual valve (32b), and a backwash line (41) is connected between the B-series permeate manual valve (32b) and the B-series permeate automatic valve (33b).
6. A multi-series MBR device with self-backwashing function according to claim 1, characterized in that, Both the A-series water pump (31a) and the B-series water pump (31b) are equipped with check valves at their outlets.
7. A multi-series MBR device with self-backwashing function according to claim 1, characterized in that, The aeration system includes a scrubbing blower (21), a scrubbing aeration pipeline (23), a scrubbing aeration branch pipe corresponding to each series of membrane modules, and a scrubbing aeration manual valve installed on each scrubbing aeration branch pipe. The scrubbing blower (21) is connected to each series of membrane modules through the scrubbing aeration pipeline (23), the scrubbing aeration branch pipe and the scrubbing aeration manual valve.