Full-automatic MBR membrane in-situ cleaning system

Abstract

The utility model discloses a full-automatic 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 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, positioning modules are arranged on the rail car and the automatic cleaning machine, the position of the automatic cleaning machine can be accurately determined, and each membrane stack is provided with a pressure sensor and a flow meter. The automatic cleaning machine is used for collecting membrane operation data in real time, when a membrane stack needing to be cleaned is detected, the system is started, the automatic cleaning machine accurately positions the membrane stack needing to be cleaned, and the cleaning assembly goes deep into the membrane stack along the membrane to clean the membrane. In-situ online cleaning can be fully automatically carried out on a plurality of membrane stacks under the state that the system does not stop and does not need to be disassembled, the cleaning efficiency is greatly improved, and the labor intensity is reduced.

Description

A fully automated in-situ cleaning system for MBR membranes Technical Field

[0001] This utility model relates to the field of in-situ cleaning of MBR membranes, and more specifically, to a fully automatic 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 a fully automatic MBR membrane in-situ cleaning system. Based on the system detection data, the cleaning program is automatically started or stopped, and the membrane stack that needs to be cleaned is accurately located by a precise positioning module, reducing labor costs and saving time and effort.

[0006] This invention enables in-situ online cleaning, meaning that when the MBR membrane becomes 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.

[0007] 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.

[0008] Technical Solution: To solve the above technical problems, this utility model provides a fully automatic 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 track vehicle is installed above the longitudinal tracks and can move along them. The track vehicle 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.

[0009] The membrane stack is equipped with a pressure sensor and a flow meter to collect membrane operation data in real time. When the collected membrane operation data is abnormal, the system issues a cleaning command and accurately provides feedback on the location of the membrane stack that needs to be cleaned.

[0010] Both the railcar and the automatic cleaning machine are equipped with positioning modules. The positioning module on the railcar can position the railcar to a certain path in the membrane tank, and then the automatic cleaning machine can be positioned to the specific membrane stack that needs to be cleaned, according to the positioning module of the automatic cleaning machine, and the cleaning program can be started.

[0011] 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.

[0012] Furthermore, each of the four corners of the bottom of the track vehicle near the track wheel set A is equipped with a longitudinal track vehicle positioning module. The positioning module consists of a track vehicle position sensor and a longitudinal track point signal transmitter. The track vehicle position sensor receives the signal generated by the longitudinal track point signal transmitter to accurately control the displacement position of the longitudinal track.

[0013] 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.

[0014] Furthermore, the automatic cleaning machine is equipped with a position sensor, and a positioning module for the submerged ultrafiltration membrane automatic cleaning machine is respectively installed at the four corners of the bottom of the automatic cleaning machine near the track wheel assembly B. This module consists of a submerged ultrafiltration membrane automatic cleaning machine position sensor and a transverse track point signal transmitter. The submerged ultrafiltration membrane automatic cleaning machine position sensor receives the signal generated by the transverse track point signal transmitter to accurately control the displacement position of the submerged ultrafiltration membrane automatic cleaning machine.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] Beneficial effects: Compared with the prior art, the technical solution of this utility model has the following beneficial effects: The fully automatic MBR membrane in-situ cleaning system provided by this utility model can realize the horizontal 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.

[0019] 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 membrane stack. All mechanical structures are above the water surface, so the mechanical structures are not easily corroded or damaged.

[0020] 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

[0021] Figure 1. Schematic diagram of a fully automatic MBR membrane in-situ cleaning system in one embodiment of this utility model.

[0022] Figure 2. A partially enlarged schematic diagram of the bottom structure of the railcar in one embodiment of this utility model.

[0023] 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.

[0024] Figure 4. Schematic diagram of the positioning module of the railcar in one embodiment of this utility model.

[0025] Figure 5. Schematic diagram of the positioning module of an automatic cleaning machine according to the present invention.

[0026] Figure 6. Schematic diagram of the structure of the automatic cleaning machine in one embodiment of this utility model.

[0027] Figure 7. Top view of the membrane tank in one embodiment of this utility model.

[0028] 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. Point signal transmitter; 11. Longitudinal track car position sensor; 12. Transverse track point signal transmitter; 13. Automatic cleaning machine position sensor; 14. Main frame; 15. Moving platform; 16. Positioning light rod; 17. Connecting rod; 18. Cleaning head; 19. Suction pipe. Detailed Implementation

[0029] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings.

[0030] As shown in Figures 1-4, this utility model provides a fully automatic in-situ cleaning system for MBR membranes. It is characterized by comprising a membrane tank 1, an automatic cleaning machine 2, and membrane stacks 3. A longitudinal track 4 is provided on the top of the membrane tank; there are an even number of longitudinal tracks 4, and they are 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. Through the movement of the railcar and the automatic cleaning machine 2, the automatic cleaning machine can be fixed in any position, enabling the cleaning of any membrane stack within the membrane tank.

[0031] The membrane stack is equipped with a pressure sensor and a flow meter to collect membrane operation data in real time. When the collected membrane operation data is abnormal, the system issues a cleaning command and accurately provides feedback on the location of the membrane stack that needs to be cleaned.

[0032] Both the railcar and the automatic cleaning machine are equipped with positioning modules. The positioning module on the railcar can position the railcar to a certain path in the membrane tank, and then the automatic cleaning machine can be positioned to the specific membrane stack that needs to be cleaned, according to the positioning module of the automatic cleaning machine, and the cleaning program can be started.

[0033] During operation, when the pressure sensor and flow meter of the membrane stack detect abnormal data, the membrane stack operation status determination program and the system operation cleaning limit conditions are activated. The membrane stack operation status determination program determines whether to perform cleaning by comprehensively judging the input membrane operation data and the system operation cleaning limit conditions.

[0034] If the cleaning conditions are not met after assessment, the cleaning system will not execute the cleaning procedure and will remain in standby mode.

[0035] If the cleaning conditions are met after assessment, the control system outputs a cleaning request and the coordinates of the membrane stack to be cleaned for the cleaning system to execute the cleaning procedure. When multiple cleaning commands are received, the cleaning process will be prioritized according to time sequence. If cleaning commands are received simultaneously, the cleaning process will be prioritized according to the order of the membrane stacks. During the cleaning process, each sensor continuously collects data and synchronously determines whether the cleaning completion condition has been met. If not, the cleaning procedure continues; if the cleaning completion condition is met, the cleaning procedure stops, and the cleaning system returns to zero to standby or executes the next cleaning command according to priority.

[0036] Furthermore, a longitudinal track vehicle positioning module is provided at each of the four corners of the bottom of the track vehicle near the track wheel set A. The positioning module consists of a track vehicle position sensor 11 and a longitudinal track position signal transmitter 10. The track vehicle position sensor 11 receives the signal generated by the longitudinal track position signal transmitter 10 to accurately control the displacement position of the longitudinal track.

[0037] Furthermore, the automatic cleaning machine is equipped with a position sensor, and an automatic cleaning machine positioning module is respectively installed at the four corners of the bottom of the automatic cleaning machine near the track wheel assembly B. This module consists of an automatic cleaning machine position sensor 13 and a transverse track position signal transmitter 12. The automatic cleaning machine position sensor 13 receives the signal generated by the transverse track position signal transmitter 12 to accurately control the displacement position of the automatic cleaning machine.

[0038] In one embodiment, the automatic cleaning machine includes a main frame 14 and a moving platform 15; the main frame 14 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 16, and the moving platform 15 can move up and down along the positioning rod 16 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 15 includes a cleaning component and a suction pipe 19. The cleaning component includes a cleaning head 18 and a connecting rod 17. The cleaning head 18 is a hollow structure with spray nozzles on the sides and bottom. The connecting rod 17 is also hollow. The cleaning head 18 and the connecting rod 17 are connected. The cleaning fluid is transported from the connecting rod 17 to the cleaning head 18 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 suction pipe 19 has a filtration device at its inlet, allowing direct use of water from inside the membrane tank for cleaning, further saving water.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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. A fully automated in-situ cleaning system for MBR membranes, characterized in that, The system includes a membrane tank (1), an automatic cleaning machine (2), and a membrane stack (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), which can move along the longitudinal tracks. 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), and the cleaning components of the automatic cleaning machine can penetrate into the membrane stack along the membrane sheet to clean the membrane sheet. Both the railcar and the automatic cleaning machine are provided with positioning modules to accurately position the automatic cleaning machine to the membrane stack that needs to be cleaned. The membrane stack is equipped with a pressure sensor and a flow meter to collect membrane operation data in real time. When the collected membrane operation data is abnormal, a cleaning command is issued.

2. The fully automated in-situ cleaning system for MBR membranes according to claim 1, characterized in that, The positioning module of the railcar includes a longitudinal track point signal transmitter (10) and a longitudinal railcar position sensor (11).

3. A fully automated in-situ cleaning system for MBR membranes according to claim 1, characterized in that, The positioning module of the automatic cleaning machine includes a transverse track point signal transmitter (12) and an automatic cleaning machine position sensor (13).

4. A fully automated in-situ cleaning system for MBR membranes 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).

5. A fully automated in-situ cleaning system for MBR membranes 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).

6. A fully automated in-situ cleaning system for MBR membranes according to claim 4 or 5, characterized in that, Each servo motor is independently controlled and operated to accurately position the automatic cleaning machine.

7. A fully automated in-situ cleaning system for MBR membranes according to claim 1, characterized in that, Both the longitudinal and transverse tracks have a three-sided enclosed structure.

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