MBR membrane in-situ cleaning system

Abstract

The utility model provides an MBR (Membrane Bioreactor) membrane in-situ cleaning system, which comprises a membrane pool, an automatic cleaning machine and a membrane stack, an even number of longitudinal rails are arranged on the top of the membrane pool, and the longitudinal rails are parallel to one another; a longitudinal rail is arranged on the upper portion of the film stack, a rail car is arranged above the longitudinal rail, the rail car can move along the longitudinal rail, the rail car comprises a transverse rail and an automatic cleaning machine, the automatic cleaning machine can move along the transverse rail, and a cleaning assembly of the automatic cleaning machine can penetrate into the film stack along the film to clean the film. In-situ on-line cleaning can be carried out on a plurality of membrane stacks under the state that the system is not shut down and does not need to be disassembled, the cleaning efficiency is greatly improved, and the labor intensity is reduced.

Description

An MBR membrane in-situ cleaning system Technical Field

[0001] This utility model relates to the field of in-situ cleaning of MBR membranes, and more specifically, to an in-situ cleaning system for MBR membranes. Background Technology

[0002] MBR, also known as membrane bioreactor, is a novel water treatment technology combining membrane separation and biological treatment units. It primarily utilizes activated sludge and macromolecular organic matter in the interception tank of the MBR membrane module immersed in an aerobic biological tank. Due to its effective interception function, it can retain microorganisms with long generation cycles, achieving deep purification of wastewater. During MBR operation, membrane fouling has consistently limited the development of membrane separation technology. During MBR operation, high sludge concentrations easily accumulate on the MBR membrane surface, especially at the root ends, causing MBR membrane fouling. Currently, to prevent MBR membrane fouling, aeration devices are installed below the MBR membrane to remove contaminants from the membrane fiber surface. However, when aeration fails, sludge easily forms a cake on the membrane fiber surface, leading to irreversible MBR membrane fouling. Furthermore, extracellular polymers and other contaminants easily form a firm filter cake layer on the membrane fiber surface, which is difficult to remove through aeration. When MBR membrane fibers become caked or irreversibly fouled, the only option is usually to remove the curtain membrane module from the membrane frame for rinsing. This process is cumbersome, time-consuming, labor-intensive, and involves a large workload, which seriously affects cleaning efficiency.

[0003] Chinese Patent No. 2021220753235 discloses an in-situ cleaning tool for MBR membranes, including a cleaning tube and a handle. The handle is fixedly installed at the end of the cleaning tube and is connected to the cleaning tube. An end spray hole is provided at the end of the cleaning tube away from the handle, and side spray holes are provided on both sides of the cleaning tube near the end spray hole. The handle is a telescopic structure, including an outer pipe and an inner pipe, with a sealing device fixedly installed at the upper end of the inner pipe. Although this patent can achieve in-situ cleaning, the actual membrane frame is approximately 2 meters high, and the cleaning tube needs to extend from the upper end of the membrane frame to the lower end for cleaning. This is difficult to achieve using only a handle, and its operability needs further verification.

[0004] Chinese Patent 202423244296.X discloses an MBR membrane in-situ cleaning device and membrane frame. The cleaning device and membrane frame are fixed together by positioning pins and limiting pins. During the cleaning process, the cleaning device inserts the cleaning components into the membrane sheets for cleaning. However, the cleaning device is fixed on the membrane frame and moves on the membrane frame. Cleaning a single membrane stack is relatively convenient, but cleaning multiple membrane stacks is relatively complicated. Summary of the Invention

[0005] Technical Problem: To solve the above problems, this utility model provides an MBR membrane in-situ cleaning system that can achieve in-situ online cleaning. That is, when the MBR membrane is clogged, there is no need to remove the curtain membrane from the membrane frame for rinsing, which greatly reduces the workload and improves cleaning efficiency.

[0006] This invention features a high degree of automation, eliminating the need to lift the membrane modules out of the membrane tank and allowing for direct cleaning using water from the original membrane tank, thus saving water consumption.

[0007] Technical Solution: To solve the above technical problems, this utility model provides an MBR membrane in-situ cleaning system, including a membrane tank, an automatic cleaning machine, and a membrane stack. The top of the membrane tank is provided with an even number of longitudinal tracks that are parallel to each other. A railcar is installed above the longitudinal tracks and can move along them. The railcar includes a transverse track and an automatic cleaning machine, which can move along the transverse track. The cleaning components of the automatic cleaning machine can penetrate deep into the membrane stack along the membrane sheets to clean them.

[0008] Furthermore, the railcar is equipped with rail wheels, which are driven by servo motors; the automatic cleaning machine is equipped with rail wheels at the four corners of its bottom, which are also driven by servo motors, for driving the automatic cleaning machine to move along the transverse rails; the railcar and the automatic cleaning machine determine the cleaning points through their respective movements, thereby achieving in-situ fully automatic cleaning of the membrane stack.

[0009] Furthermore, the four track wheel sets B of the automatic cleaning machine include servo motors and track wheels B, and the four motors are independently controlled and operated to accurately position a certain membrane stack to be cleaned in a certain row and to clean different membrane sheets of a certain membrane stack during the cleaning process.

[0010] Furthermore, the automatic cleaning machine includes a main frame, a cleaning assembly, and a moving platform. The main frame has a three-dimensional structure, with track wheels equipped with servo motors at the four corners of its bottom to control the position of the automatic cleaning machine. The main frame is equipped with positioning rods, and the moving platform can move up and down along the rods and can be fixed in any position. The moving platform includes a cleaning assembly and a suction pipe. The cleaning assembly includes a cleaning head and a connecting rod. The cleaning head has a hollow structure and spray nozzles on its sides and bottom. The connecting rod has a hollow structure. The cleaning head and the connecting rod are connected. The cleaning fluid is transported from the connecting rod to the cleaning head and sprayed out from the spray nozzles of the cleaning head. High-pressure water is used to impact and break up the mud or filter cake layer on the surface of the MBR membrane that is not easily removed by air scrubbing.

[0011] Furthermore, both the longitudinal and transverse tracks are three-sided enclosed structures, used to limit the vertical displacement of track wheels A and B along the track, ensuring that the track wheels only move along the horizontal direction of the track.

[0012] When a membrane stack in the membrane tank needs cleaning, the equipment is started. The location is determined by a moving railcar and an automatic cleaning machine. After the location is fixed, the water pump and servo motor of the automatic cleaning machine are turned on. The cleaning components move down with the moving platform and insert the cleaning head into the membrane sheets to perform high-pressure water rinsing on the membrane stack. After cleaning, the automatic cleaning machine is removed or the next set of membrane stacks is cleaned by the moving railcar and the automatic cleaning machine.

[0013] Beneficial effects: Compared with the prior art, the technical solution of this utility model has the following beneficial effects: The MBR membrane in-situ cleaning system provided by this utility model can realize the movement of the automatic cleaning machine above the membrane tank through the setting of longitudinal track and track car. It can clean any membrane stack. After the position of the automatic cleaning machine is fixed, the cleaning component can be inserted into the membrane sheets for high-pressure water rinsing under mechanical action. There is no need to stop the system operation, no need to lift the membrane stack out of the membrane tank, and no need to pump out the water in the membrane tank. The cleaning effect is good, the operation is simple and easy to implement.

[0014] When using the MBR membrane in-situ cleaning system provided by this utility model, the in-situ cleaning device is placed above the membrane tank, with only the cleaning components extending into the MBR. All mechanical structures are above the water surface, so the mechanical structures are not easily corroded or damaged.

[0015] The in-situ cleaning device provided by this utility model has a simple structure and is detachable, making it convenient for daily maintenance. Attached Figure Description

[0016] Figure 1. Schematic diagram of an MBR membrane in-situ cleaning system in one embodiment of this utility model.

[0017] Figure 2. A partially enlarged schematic diagram of the bottom structure of the railcar in one embodiment of this utility model.

[0018] Figure 3. Partial structural diagram of the contact point between the automatic cleaning machine and the transverse track in one embodiment of this utility model.

[0019] Figure 4. Schematic diagram of the structure of the automatic cleaning machine in one embodiment of this utility model.

[0020] The diagram shows: 1. Membrane tank; 2. Automatic cleaning machine; 3. Membrane stack; 4. Longitudinal track; 5. Transverse track; 6. Track wheel A; 7. Servo motor A; 8. Servo motor B; 9. Track wheel B; 10. Main frame; 11. Moving platform; 12. Positioning rod; 13. Connecting rod; 14. Cleaning head; 15. Suction pipe. Detailed Implementation

[0021] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings.

[0022] As shown in Figures 1-4, this utility model provides an MBR membrane in-situ cleaning system, characterized in that it includes a membrane tank 1, an automatic cleaning machine 2, and membrane stacks 3. The top of the membrane tank is provided with longitudinal tracks 4, which are an even number and parallel to each other. A railcar is provided above the longitudinal tracks 4, and the railcar can move along the longitudinal tracks. The railcar includes a transverse track 5 and the automatic cleaning machine 2, which can move along the transverse track 5. By moving the railcar and the automatic cleaning machine 2, the automatic cleaning machine can be fixed in any position to achieve cleaning of any membrane stack in the membrane tank.

[0023] In one embodiment, the automatic cleaning machine includes a main frame 10 and a moving platform 11; the main frame has a three-dimensional structure, and the four bottom corners of the main frame are provided with track wheels B equipped with servo motors. 9. The automatic cleaning machine can move along the transverse track 5, further controlling its position. The main frame is equipped with a positioning rod 12, and the moving platform 11 can move up and down along the positioning rod 12 and can be fixed at any position, allowing the cleaning component of the automatic cleaning machine to be inserted into any position between the membrane sheets for cleaning. The length of the cleaning component is greater than the height of the membrane stack to facilitate cleaning to the bottom of the membrane sheets. The moving platform 11 includes a cleaning component and a suction pipe 15. The cleaning component includes a cleaning head 14 and a connecting rod 13. The cleaning head 14 is a hollow structure with spray nozzles on the sides and bottom. The connecting rod 13 is also hollow. The cleaning head 14 and the connecting rod 13 are connected. The cleaning fluid is transported from the connecting rod 13 to the cleaning head 14 and sprayed out from the spray nozzles of the cleaning head, using high-pressure water to break up the mud or filter cake layer on the MBR membrane surface that is difficult to remove by air scrubbing. The inlet of the suction pipe 15 is equipped with a filtration device, allowing direct use of water from inside the membrane tank for cleaning, further saving water.

[0024] In one embodiment, the railcar is equipped with rail wheels A6, which are located at the four corners of the railcar and are a multiple of four. The rail wheels are driven by servo motors A7, enabling the railcar to move along the longitudinal track 4. The four motors are independently controlled and operated to accurately position the membrane stack to be cleaned.

[0025] In one embodiment, the longitudinal track 4 is a three-sided enclosed structure, which can restrict the vertical displacement of the track wheel and ensure that it can only move in the horizontal direction along the longitudinal track.

[0026] In one embodiment, the automatic cleaning machine 2 is provided with track wheels B9 at its four corners. The track wheels B9 are driven by servo motors B8 to move the automatic cleaning machine 2 along the transverse track 5. Each servo motor is independently controlled and operated to accurately position the automatic cleaning machine.

[0027] In one embodiment, the transverse track is a three-sided enclosed structure, which can limit the vertical displacement of the track wheel B and ensure that movement is only in the horizontal direction.

[0028] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An MBR membrane in-situ cleaning system, characterized in that, The system includes a membrane tank (1), an automatic cleaning machine (2), and a membrane stack (3). The membrane tank (1) has a longitudinal track (4) on its top. There are an even number of longitudinal tracks (4), and they are parallel to each other. A railcar is provided above the longitudinal track (4). The railcar can move along the longitudinal track. The railcar includes a transverse track (5) and an automatic cleaning machine (2). The automatic cleaning machine (2) can move along the transverse track (5). The cleaning component of the automatic cleaning machine can go deep into the membrane stack along the membrane to clean the membrane.

2. The MBR membrane in-situ cleaning system according to claim 1, characterized in that, The railcar is equipped with rail wheels A (6), which are driven by servo motor A (7) to enable the railcar to move along the longitudinal track (4).

3. The MBR membrane in-situ cleaning system according to claim 1, characterized in that, The automatic cleaning machine (2) has track wheels B (9) at the four corners of its bottom. The track wheels B are driven by servo motor B (8) to drive the automatic cleaning machine (2) to move along the direction of the transverse track (5).

4. An MBR membrane in-situ cleaning system according to claim 2 or 3, characterized in that, Each servo motor is independently controlled and operated to accurately position the automatic cleaning machine.

5. An MBR membrane in-situ cleaning system according to claim 1, characterized in that, Both the longitudinal and transverse tracks have a three-sided enclosed structure.

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