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What should We do if the RO membrane is blocked?



Whether it is a seawater desalination system, a brackish water reverse osmosis system, a household or commercial RO machine, there will be a problem that the reverse osmosis RO membrane is blocked and the water production flow is small. It is inevitable that the RO membrane of the reverse osmosis system will be blocked.

Reasons and solutions for the blocking of RO membrane in reverse osmosis system:
1. The pretreatment device equipped in the system is not suitable for the quality and flow of the raw water, or the necessary process equipment and process links are not equipped in the system.
2. The pretreatment device is not operating normally, that is, the original pretreatment equipment of the system has a low ability to remove raw water SDI components, turbidity, colloids, etc., and the pretreatment effect is not ideal.
3. The system has selected inappropriate equipment or the equipment material is incorrectly selected (pumps, piping, and others).
4. The system chemical injection device fails (acid, flocculation/coagulant aid, scale inhibitor/dispersant, reducing agent and others).
5. Appropriate protective measures have not been taken after the equipment is running intermittently or the system is out of use.
6. ​​Unreasonable equipment operation and utilization by operation management personnel (recovery rate, water production volume, concentrated water volume, pressure difference, cleaning and others).
7. Long-term accumulation of insoluble sediments in the membrane system.
8. The raw water composition has changed greatly or the water source characteristics have undergone a fundamental change.
9. A considerable degree of microbial contamination has occurred in the reverse osmosis membrane system.

When the following situations occur, whether it is a seawater desalination system, a brackish water reverse osmosis system, a household or commercial RO machine, the reverse osmosis membrane inside should be cleaned;
1. The water output of the standardized equipment has been reduced by 10~15%;
2. The operating pressure of the standardized membrane system has increased by 15%;
3. The salt permeability of the standardized membrane system has increased by 10~15% compared with the initial normal value;
4. The operating pressure difference has increased by 15% compared to the initial operation.

Reverse osmosis membrane cleaning method:
1. Negative pressure cleaning: Negative pressure cleaning can be said to be the pressure formed on the side of the reverse osmosis membrane through the vacuum suction of the equipment, which can effectively remove the contaminants on the membrane surface and inside;
2. Recoil: Recoil is the use of strong gas or liquid to clean the surface of the membrane, so as to clean up the contaminants inside the membrane and restore the membrane. Recoil is currently one of the more common ways to clean reverse osmosis membranes. One
3. Chemical cleaning: The chemical cleaning method is to use chemical cleaning agents to clean the reverse osmosis membrane. Because chemical targeted cleaning can also effectively clean the membrane, this method is also one of the commonly used cleaning methods. .

As for how long the reverse osmosis RO membrane in the seawater desalination system, brackish water reverse osmosis system, household or commercial RO machine will be blocked after working, it depends on the raw water quality and maintenance and other factors. Shenzhen Youber Technology Co., Ltd. has a professional technical team that can provide timely and professional pre-sales and after-sales consultation. If you have any questions, please feel free to contact us!

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