Self-aeration online cleaning equipment for MBR (Membrane Bioreactor) membrane

Abstract

The utility model discloses MBR (membrane bioreactor) membrane self-aeration online cleaning equipment which comprises a membrane bioreactor tank body, an MBR filter membrane group arranged in the tank body, a suction pump arranged at the top of the tank body, and an aeration mechanism arranged outside the tank body, the aeration mechanism comprises a centrifugal pump and a microporous aeration head connected with a water outlet pipe of the centrifugal pump, a water inlet pipe of the centrifugal pump is communicated with the water passing opening in the tank body, and the front end of the micropore aeration head penetrates through the side wall of the tank body and faces the position where the lower portion of the filter membrane set is located. According to the utility model, the aeration mechanism is arranged outside the membrane reactor, and mixed gas and liquid generated by the microporous aeration head are used for flushing the MBR membrane, so that the flushing efficiency of the MBR membrane can be effectively improved, and the device has a better cleaning effect on the MBR membrane, and is higher in efficiency and lower in cost.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an online self-aeration cleaning device for MBR membranes. Background Technology

[0002] Membrane bioreactors (MBRs) are wastewater treatment technologies that combine membrane separation units with biological treatment units. They replace secondary sedimentation tanks with membrane modules, maintaining a high concentration of active sludge within the bioreactor, reducing the footprint of wastewater treatment facilities, and minimizing sludge volume by maintaining a low sludge load. Compared to traditional biological water treatment technologies, MBRs offer advantages such as high treatment efficiency, good effluent quality, compact equipment, small footprint, easy automation, and simple operation and management. During the operation of a biofilm reactor, suspended solids, colloids, microorganisms, and other particulate matter in the wastewater easily adhere to the MBR membrane, leading to membrane pore blockage and reduced membrane flux. Therefore, regular cleaning of the MBR membrane is necessary.

[0003] Commonly used MBR membrane cleaning methods include online backwashing, aeration cleaning, and chemical cleaning. Aeration cleaning is a physical cleaning method that enhances water circulation. Through high-intensity continuous aeration, the sludge deposited on the membrane surface is flushed away using the circulation and shear force of the water. Continuous aeration is also required during online backwashing and chemical cleaning. Current MBR membrane aeration cleaning processes typically use aeration discs and blowers for aeration. Blowers supply dissolved oxygen to the biofilm reactor, but the large diameter and rapid rise of the bubbles generated by the aeration discs result in a small contact surface area and short contact time between the bubbles and the contaminants on the MBR membrane surface in the bioreactor. This leads to low MBR membrane cleaning efficiency, and the blowers consume a lot of power and have high cleaning costs. Summary of the Invention

[0004] This invention provides an online self-aeration cleaning device for MBR membranes, aiming to solve the problems of low cleaning efficiency, high power consumption, and high cost in the existing technology of using blowers and aeration discs to clean MBR membranes, due to the small contact surface area and short contact time between air bubbles and pollutants.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] Design an MBR membrane self-aeration online cleaning device, including a membrane bioreactor tank, an MBR filter membrane assembly installed inside the tank, a suction pump installed at the top of the tank, the inlet pipe of the suction pump being connected to the outlet of the filtered water from the filter membrane assembly; an aeration mechanism installed outside the tank, the aeration mechanism including a centrifugal pump, a microporous aeration head connected to the outlet pipe of the centrifugal pump, and an air inlet pipe connected to the microporous aeration head, the inlet pipe of the centrifugal pump being connected to the water outlet on the tank, and the front end of the microporous aeration head passing through the side wall of the tank and facing the lower part of the filter membrane assembly.

[0007] In the above technical solution, by setting a submersible pump and a microporous aerator outside the membrane bioreactor, the mixed gas and liquid can be sprayed into the membrane bioreactor at high speed, generating a large number of microbubbles in the membrane bioreactor, which impacts and cleans the filter membrane, thereby removing suspended solids, colloids, microorganisms and other particulate matter attached to the filter membrane and avoiding clogging of the MBR membrane.

[0008] Preferably, the front end of the microporous aeration head is connected to a telescopic hose that passes through the side wall of the tank. The front end of the telescopic hose is connected to a pipe head, and the vertical and horizontal movement of the pipe head is adjusted by the aeration adjustment mechanism.

[0009] Preferably, the aeration adjustment mechanism includes an installation plate set on the top of the tank, a transverse telescopic component is provided on the installation plate, a longitudinal telescopic component is connected to the front end of the telescopic rod of the transverse telescopic component, a connecting rod is fixedly connected to the lower end of the telescopic rod of the longitudinal telescopic component, and the lower end of the connecting rod is fixedly connected to the pipe head.

[0010] Preferably, a movable opening is provided on the mounting plate, the longitudinal telescopic member moves within the movable opening, and a sliding groove is provided on the mounting plate on both sides of the movable opening. A pulley is installed on both sides of the longitudinal telescopic member, and the pulleys on both sides move within the corresponding sliding groove. The sliding groove is parallel to the movable opening and has the same length.

[0011] The lateral expansion joint can drive the longitudinal expansion joint to move horizontally within the moving port, thereby causing the pipe head to move laterally; the longitudinal expansion joint drives the pipe head to move up and down through the connecting rod. The lateral expansion joint and the longitudinal expansion rod work together to adjust the spray angle and spray direction of the pipe head in both the lateral and longitudinal directions, and to rinse different positions of the filter membrane assembly, thereby increasing the aeration range and the cleaning surface. It can also increase the disturbance of the water flow in the membrane reactor tank, resulting in better aeration and better cleaning of the MBR membrane.

[0012] Preferably, the lateral telescopic component and the longitudinal telescopic component can be cylinders, hydraulic cylinders or electric push rods.

[0013] Preferably, an inlet valve is provided on the inlet pipe of the centrifugal pump; an aeration valve is provided at the front end of the microporous aeration head; an air inlet valve is provided at the upper end of the air inlet pipe; and an outlet valve is provided on the outlet pipe of the suction pump.

[0014] Preferably, the microbubbles generated by the microporous aeration head have a diameter of 500 nanometers to 50 micrometers. The microbubbles have a relatively large specific surface area, which can significantly increase the specific surface area of ​​contact when they come into contact with pollutants on the surface of the MBR membrane. In addition, the microbubbles rise slowly, which can increase the contact time with pollutants on the surface of the MBR membrane. At the same time, since the microbubbles generate a weak charge at the moment of rupture, they can easily adsorb hydroxide ions in the water to form a hydroxyl radical (a strong oxidant), which can peel off the organic particles adsorbed on the membrane and float them to the water surface. This makes the microbubbles highly efficient at removing pollutants from the surface of the MBR membrane module.

[0015] The beneficial effects of this utility model are as follows:

[0016] By setting up an aeration mechanism outside the membrane reactor, the mixed gas and liquid generated by the microporous aeration head can be used to rinse the MBR membrane, which can effectively improve the rinsing efficiency of the MBR membrane. The microbubbles have a large specific surface area and a slow rising speed, resulting in a large specific surface area and increased contact time with pollutants on the MBR membrane surface. This allows them to adsorb and peel off particulate matter attached to the membrane, thereby playing a role in efficiently removing pollutants from the membrane.

[0017] By setting up telescopic hoses and aeration adjustment mechanisms, the position and angle of the hose head can be adjusted, allowing for rinsing of different parts of the filter membrane assembly, increasing the cleaning surface, and also disturbing the water flow in the tank to increase the aeration range, thereby further improving the cleaning effect of the MBR membrane.

[0018] Compared with the existing aeration methods that use aeration discs and blowers, this invention provides better cleaning effect, higher efficiency, and lower cost for MBR membranes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the MBR membrane self-aeration online cleaning device of this utility model;

[0020] Figure 2 This is a top view of the MBR membrane self-aeration online cleaning device of this utility model;

[0021] Figure 3 This is a side view of the MBR membrane self-aeration online cleaning device of this utility model;

[0022] Figure 4 This is a schematic diagram of the aeration adjustment mechanism;

[0023] Figure 5 This is a top view of the aeration adjustment mechanism;

[0024] Figure 6 This is a schematic diagram of the telescopic hose.

[0025] The following components are labeled in the diagram: 1. Tank body; 2. Filter membrane assembly; 3. Suction pump; 4. Centrifugal pump; 5. Inlet pipe; 6. Microporous aeration head; 7. Air inlet pipe; 8. Telescopic hose; 9. Pipe end; 10. Mounting plate; 11. Lateral telescopic component; 12. Longitudinal telescopic component; 13. Connecting rod; 14. Moving port; 15. Slide groove; 16. Pulley; 17. Inlet valve; 18. Aeration valve; 19. Air inlet valve; 20. Outlet valve. Detailed Implementation

[0026] The specific embodiments of this utility model will be described below with reference to the accompanying drawings and examples. However, the following examples are only used to illustrate the implementation of this utility model in detail and do not limit the scope of this utility model in any way.

[0027] Example 1: An online self-aeration cleaning device for MBR membranes, see [link / reference] Figure 1 , Figure 2 The system includes a membrane bioreactor tank 1, an MBR filter membrane assembly 2 installed inside the tank 1, a suction pump 3 installed at the top of the tank 1, and the inlet pipe of the suction pump 3 connected to the outlet of the filtered water from the filter membrane assembly 2. An aeration mechanism is installed outside the tank 1, which includes a centrifugal pump 4, a microporous aeration head 6 connected to the outlet pipe of the centrifugal pump 4, and an air inlet pipe 7 connected to the microporous aeration head 6. The air inlet pipe 7 is located outside the tank wall and its top end is higher than the water surface. The inlet pipe 5 of the centrifugal pump 4 is connected to the water outlet on the tank 1. The front end of the microporous aeration head 6 passes through the side wall of the tank 1 and faces the lower part of the filter membrane assembly 2.

[0028] An inlet valve 17 is installed on the inlet pipe 5 of the centrifugal pump 4; an aeration valve 18 is installed at the front end of the microporous aeration head 6; an air inlet valve 19 is installed at the upper end of the air inlet pipe 7; and an outlet valve 20 is installed on the outlet pipe of the suction pump 3.

[0029] Example 2: An online self-aeration cleaning device for MBR membranes, see [link / reference] Figures 3-5The difference from Embodiment 1 is that the front end of the microporous aeration head 6 passes through the side wall of the tank body 1 and is connected to a telescopic hose 8. The front end of the telescopic hose 8 is connected to a pipe head 9, and the vertical and horizontal movement of the pipe head 9 is adjusted by an aeration adjustment mechanism. The aeration adjustment mechanism includes a mounting plate 10 set on the top of the tank body 1. A horizontal telescopic member 11 is set on the mounting plate 10. The front end of the telescopic rod of the horizontal telescopic member 11 is connected to a longitudinal telescopic member 12. The lower end of the telescopic rod of the longitudinal telescopic member 12 is fixedly connected to a connecting rod 13, and the lower end of the connecting rod 13 is fixedly connected to the pipe head. A moving opening 14 is opened on the mounting plate 10. The longitudinal telescopic member 12 moves within the moving opening 14. Sliding grooves 15 are respectively opened on the mounting plate 10 on both sides of the moving opening 14. Pulleys 16 are respectively installed on both sides of the longitudinal telescopic member 12. The two pulleys 16 move within the corresponding sliding grooves 15. The sliding grooves 15 are parallel to the moving opening 14 and have the same length. In this embodiment, the lateral telescopic member 11 and the longitudinal telescopic member 12 can be cylinders, hydraulic cylinders or electric push rods.

[0030] In the above embodiments, the microbubbles generated by the microporous aeration head have a diameter of 500 nanometers to 50 micrometers. When the microbubbles come into contact with pollutants on the surface of the MBR membrane, they can significantly increase the specific surface area of ​​contact. Furthermore, the slow rising speed of the microbubbles increases the contact time and the dissolved oxygen content in the tank. Simultaneously, because the microbubbles generate a weak charge upon rupture, they easily adsorb hydroxide ions in the water to form a hydroxyl radical (a strong oxidant), making the microbubbles highly efficient at removing pollutants from the surface of the MBR membrane module.

[0031] The microbubble aerator head structure can be implemented using existing equipment components. Those skilled in the art can understand its structure and working principle and select suitable components for application in the technical solution of this utility model. For specific structure and principle, please refer to the micro-nano aeration device in utility model patent CN201721484798.7 (publication number CN207451702U). This type of microbubble aerator head utilizes the negative pressure suction principle generated by its own hydrodynamic kinetic energy to produce water-air mixing. The power consumption required to generate the same amount of dissolved oxygen in water is only 1 / 4 to 1 / 5 of that required by ordinary blowers, thus significantly saving aeration energy consumption and reducing cleaning costs.

[0032] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components.

[0033] The specific working principle of this utility model's MBR membrane self-aeration online cleaning equipment is as follows: During operation, wastewater treated by the pretreatment process enters the membrane bioreactor tank through the inlet on the tank body. A suction pump draws the purified water filtered by the MBR membrane module to the outside for further treatment. The MBR membranes inside the membrane bioreactor require periodic aeration cleaning. During cleaning, a centrifugal pump is activated.

[0034] Water enters the centrifugal pump chamber through the inlet pipe and, under the action of the centrifugal pump, flows at a sufficiently high flow rate and velocity from the pump outlet into the microporous aerator head. A negative pressure is created within the aerator head, while external air is simultaneously drawn in through the air inlet pipe, forming a gas-liquid mixture. This mixture is then sprayed at high speed into the membrane bioreactor (MBR) tank, generating numerous microbubbles. The combined effect of the water flow and the microbubbles cleans the deposits on the MBR membrane assembly. The lateral and longitudinal expansion joints in the aeration adjustment mechanism allow for adjustment of the pipe head's lateral and longitudinal positions, enabling flushing of different areas of the membrane assembly and also turbulent water flow, thus increasing the aeration range.

[0035] Microbubbles have a large specific surface area and a slow rising speed. The contraction and bursting of bubbles release a weak charge, which can peel off organic particles attached to the membrane and float them to the water surface. This determines that microbubbles can play a self-cleaning role for organic particles adhering to the MBR membrane in the water. The aeration mechanism in this invention requires low power consumption to generate microbubbles per unit time, making the MBR membrane self-aeration online cleaning equipment of this invention characterized by short process, low energy consumption, and high efficiency.

[0036] This invention can perform physical cleaning, i.e., aeration cleaning, alone, or it can be used in conjunction with chemical cleaning. When adding chemical agents for cleaning, aeration is used in conjunction with the aeration, making this invention more widely applicable, more efficient in cleaning, and able to significantly reduce energy consumption and cleaning costs.

[0037] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings and examples. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, changes or modifications can be made without departing from the spirit of the present invention.

Claims

1. A MBR membrane self-aeration online cleaning device, comprising a membrane bioreactor tank body, an MBR filter membrane group is arranged in the tank body, characterized in that, A suction pump is arranged on the top of the pool body, and a water inlet pipe of the suction pump is communicated with the outlet of the filtered clean water of the filter membrane group; an aeration mechanism is arranged outside the pool body, and the aeration mechanism comprises a centrifugal pump, a microporous aeration head connected with a water outlet pipe of the centrifugal pump, and an air inlet pipe communicated with the microporous aeration head; a water inlet pipe of the centrifugal pump is communicated with a water passage on the pool body, and a front end of the microporous aeration head penetrates through a side wall of the pool body and faces a position where the filter membrane group is located.

2. The MBR membrane self-aeration online cleaning apparatus according to claim 1, characterized in that, A front end of the aeration head is connected with a flexible hose, and a pipe head is connected with a front end of the flexible hose; the aeration adjusting mechanism is used to adjust the up-down movement and the transverse movement of the pipe head.

3. The MBR membrane self-aeration online cleaning apparatus according to claim 2, characterized in that, The aeration adjusting mechanism comprises a mounting plate arranged on the top of the pool body, and a transverse flexible member is arranged on the mounting plate; a front end of an extension rod of the transverse flexible member is connected with a longitudinal flexible member; a lower end of an extension rod of the longitudinal flexible member is fixedly connected with a connecting rod; and a lower end of the connecting rod is fixedly connected with the pipe head.

4. The MBR membrane self-aeration online cleaning apparatus according to claim 3, characterized in that, A moving opening is formed in the mounting plate, and the longitudinal flexible member moves in the moving opening; and a slide groove is formed in the mounting plate on both sides of the moving opening, and a pulley is arranged on each side of the longitudinal flexible member; and the pulleys on the two sides move in the corresponding slide grooves.

5. The MBR membrane self-aeration online cleaning apparatus according to claim 3, characterized in that, The transverse flexible member and the longitudinal flexible member are gas cylinders, hydraulic cylinders or electric push rods.

6. The MBR membrane self-aeration online cleaning apparatus according to claim 1, characterized in that, A water inlet valve is arranged on the water inlet pipe of the centrifugal pump; an aeration valve is arranged on the front end of the microporous aeration head; an air inlet valve is arranged on the upper end of the air inlet pipe; and a water outlet valve is arranged on the water outlet pipe of the suction pump.

7. The MBR membrane self-aeration online cleaning apparatus according to claim 1, characterized in that, The microporous aeration head generates microporous bubbles with a diameter of 500 nanometers to 50 micrometers.

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