What conditions need to be met for chemical cleaning of membrane systems

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Release Date:

2023-09-08

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Suspended solids, colloids, organic matter, microorganisms, and salts precipitated after concentration in the influent will adhere to the membrane surface. After a period of operation, it will cause fouling and blockage of the membrane components, resulting in a decrease in system performance; The performance degradation of the membrane system is mainly manifested by a decrease in water production, a decrease in desalination rate (increased conductivity), an increase in pressure difference between influent and concentrated water, and a change of about 10% in the above indicators. Therefore, it is necessary to start the cleaning program in a timely manner. Only by cleaning can the initial performance be restored.

 

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During normal operation, the membrane inside the reverse osmosis or nanofiltration element may be contaminated by inorganic salt scale, microorganisms, colloidal particles, and insoluble organic substances, resulting in a decrease or simultaneous deterioration of the standard production water flow rate and system desalination rate.

When the following situations occur, it is necessary to clean the membrane components:

1. Reduce standard water production by more than 10%;

2. The standard pressure difference between inlet water and concentrated water has increased by 15%;

3. After the standard salt penetration rate increases by more than 5% and meets the chemical cleaning conditions, chemical cleaning must be carried out in a timely manner. Generally, the initial performance can be basically restored after cleaning;

However, if not cleaned in a timely manner, it will cause deep pollution of the membrane system, resulting in minimal chemical cleaning effect and making it difficult to restore the system's good performance.

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