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When & How to Replace the MBR Membrane?

When & How to Replace the MBR Membrane?

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MBR membrane has a good effluent quality and significant treatment effect and is often used in advanced sewage treatment. During operation, the MBR membrane may be damaged or polluted due to improper operation or other reasons, so it is necessary to make the replacement. Many clients are not sure when and how to replace the MBR membrane. This article will give you a brief introduction.

When & How to Replace the MBR Membrane?

When to Replace the MBR Membrane?

Usually, MBR membrane operation is very stable, and taking the membrane out of the membrane module for maintenance is unnecessary. However, a serious operational error, such as the MBR membrane being scratched by large particles, may cause pollution and damage to the MBR membrane. If the effluent water quality still fails to meet the requirements after several times of immersion and cleaning. It is time to take the membrane out from the module for replacement.

How to Judge the Damage Degree of the MBR Membrane?

  1. Check whether the flux of each MBR membrane module changes significantly under a specific pressure difference. If the flux is lower than the original design flux by more than 20%, then the membrane module is damaged.
  2. Lift the damaged module out of the water, and ensure the highest part of the module is exposed to the water surface. Or lower the water level to the upper part of the module. The other membrane modules can operate normally.
  3. Separate the water collection pipe and the branch pipe in the membrane module and take out the MBR membrane one by one, check the cause, and start maintenance.

How to Replace the MBR Membrane?

Generally speaking, the possibility of damage to the entire MBR membrane is small. In most cases, only some fibers are damaged. At this time, the damaged membrane needs to be replaced. Please take special care not to lose any spare parts from the module when removing the entire MBR membrane and switching on the new one.

Put the MBR membrane into the module, connect different pipes, adjust the valve, wait for the whole module to be immersed in the water, and start rerunning the system.

When & How to Replace the MBR Membrane?


  1. The replacement of the sealing ring and the fixing bolts on the frame must be firm to avoid loosening or damage. It is recommended to check the connecting accessories every 3 months.
  2. We provide the accessories freely on the module to all our clients. For any special requests, please inform us when ordering the MBR membranes.

The above information shows that when the MBR is damaged or polluted, it must be replaced. And we should follow the replacement process to avoid unnecessary troubles. Regular cleaning of membrane modules can extend the service life of MBR membranes and reduce the replacement frequency.

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 or any other related questions, don’t hesitate to contact SPERTA.

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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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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