Have you ever wondered why reverse osmosis cleaning often places alkaline cleaning after acid cleaning?-Hezhong Environment (Beijing) Co., Ltd. was established in 2003

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Have you ever wondered why reverse osmosis cleaning often places alkaline cleaning after acid cleaning?

Published Time:

2022-08-01

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Every reverse osmosis system will experience contamination and require cleaning. Since contamination usually involves more than one pollutant, a typical cleaning process usually includes two major steps: low-pH cleaning and high-pH cleaning, as required.

Different pollutants should be cleaned with different cleaning agents. Alkaline cleaning is mainly used to remove microorganisms or organic pollutants, while acidic cleaning is mainly used to remove scaling. Cleaning agents should be selected according to the type of pollutant and membrane type to avoid damaging the membrane.

The order of use of cleaning agents should be determined according to the actual problem. The usual cleaning order is to perform acid washing first, followed by alkaline washing.

In some cases, if the contamination is mainly organic matter or microorganisms, alkaline washing can be performed first, followed by acid washing, and finally another alkaline washing step.

The important reason for using alkaline washing as the last step is that it allows the membrane pores after acid washing to fully open, restoring water production flow.

If the conventional cleaning procedure of acid washing followed by alkaline washing is not adopted, it is necessary to consult a membrane expert to help make the correct choice.

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