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MBR Membrane - Design and Working Principle

MBR Membrane – Design And Working Principle

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Last Updated on July 24, 2022 by Kevin Chen

MBR membrane is designed to replace the secondary sedimentation tank in traditional water treatment methods and is very common in modern water treatment projects. The below article will show you the process and working principle of the MBR membrane.

MBR Membrane – Working Principle

MBR membrane is to immerse the membrane module into the activated sludge reaction tank. Through negative pressure suction, the water in the activated sludge biological reaction tank is filtered by the membrane and discharged or reused. Standard MBR membranes are divided into microfiltration and ultrafiltration. The principle is that the macromolecules in the water are trapped on the surface of the membrane by pressure, and the water molecules can freely pass through the membrane.

MBR Membrane - Design And Working Principle

Design of MBR Membrane

MBR membrane can be divided into the flat sheet and the hollow fiber MBR. Hollow fiber MBR is also called “curtain-type MBR” because of its appearance and structure, similar to a “door curtain”. The flat sheet is a double-layer structure with an inner lining sheet containing a support layer with high mechanical strength. The design process has the following differences.

Flat Sheet MBR membrane: A flat sheet membrane consists of the filter, diversion cloth, baffle plate, and water outlet spout. 

Hollow fiber MBR membrane: The hollow fiber MBR membrane element is filamentous, and the tensile strength of the membrane fibers made of PVDF can exceed 200N.

Except for the difference between the MBR membrane core elements, the external structure are all made of 304 stainless steel or carbon steel.

MBR Membrane - Design And Working Principle

MBR Membrane Treatment Process Flow

In the water treatment system, the membrane module is one of the components. It cannot work alone and must work with related equipment. These equipment materials include a biochemical treatment system, blower and water pump system, electrical control system, valves, and pipeline system.

Their working state determines the performance of the membrane module, which in turn determines whether the membrane bioreactor can complete the commissioning. The following is a flow chart of the complete MBR membrane treatment process.

MBR Membrane - Design And Working Principle

The above is the introduction of the design and the working principle of the MBR membrane. If you have any other related questions, don’t hesitate to get in touch with SPERTA.
Shanghai SPERTA Environmental Technology Co., Ltd. has specialized in producing water treatment products for many years. The company has its own MBR membrane technology, a complete technical team, and pre-sales and after-sales service. If you have any needs, please feel free to contact us.

Kevin Chen

Kevin Chen

Hi, I'm the author of this post and have been in this field for over 5 years. If you have questions regarding the MBR membrane products or want to purchase the MBR membrane, please feel free to contact me by email. kevin@spertasystems.com

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Can We Clean The Mbr Membrane With Sodium Hypochlorite?

Can We Clean The MBR Membrane With Sodium Hypochlorite?

The cleaning frequency of the MBR membrane and the choice of the cleaning agent determine the final filtration effect of the membrane bioreactor. Some people think we can use sodium hypochlorite as the cleaning agent, but some people don’t think so.

MBR Offline Cleaning I

How to Do Offline Chemical Cleaning For MBR Membranes

Step 1: Remove the suction tube and the aeration tube from the MBR module. Then take the MBR module out of the tank. 

Step 2: Use a nozzle to clean and remove the activated sludge attached to the surface of the fibers.

Step 3: Take the MBR elements out of the module and immerse the elements in a prescribed chemical solution tank. Stay for 6-12 hours.

Step 4: Take out the MBR element from the immersion cleaning tank and wash it thoroughly with water to remove the chemical solution.

Step 5: Install the MBR on the MBR module after cleaning.

Step 6: Connect the aeration pipe and put the module in the tank. Stop the filtration, just let the aeration run for more than 30 minutes, and then start the filtration.

Step 7: Before discharging the chemical solution, reduce the sodium hypochlorite with sodium thiosulfate (Na2S2O3 NH2O), and then discharge.

Step 8: If there is a large amount of inorganic scale on the surface of the MBR after sodium hypochlorite washing, acid washing is also needed.

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