How to maintain and service reverse osmosis membrane systems during downtime-Hezhong Environment (Beijing) Co., Ltd. was established in 2003

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How to maintain and service reverse osmosis membrane systems during downtime

Published Time:

2022-11-14

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When using reverse osmosis membrane systems for water treatment, membrane systems often fail to operate continuously for a long time due to various reasons. When the membrane system is shut down for a certain period of time, different maintenance measures should be formulated according to the length of time the membrane system is shut down.

I. Short-term shutdown (no more than 48 hours)

1. Use the membrane system product water as the feed water to flush (low pressure, high flow) the reverse osmosis membrane system;

2. Prevent air from entering the system. After flushing until the conductivity of the concentrate and feed water is consistent, the relevant pipelines and valves should be closed;

3. To prevent bacterial growth, it is necessary to flush once every 24 hours using the above method. If the ambient temperature is higher than 27℃, the flushing frequency should be adjusted to once every 12 hours.

II. Long-term shutdown (more than 48 hours)

1. Perform a chemical cleaning and sterilization treatment;

2. Prepare a (1.0% sodium bisulfite) protective solution for circulating flushing and filling the membrane system. Close all valves to prevent air from entering the membrane system and causing the protective solution to fail;

3. Check the pH value of the protective solution weekly. When the pH is less than 3, the protective solution should be replaced immediately;

4. Flush and replace the protective solution every 30 days using the above method. If the ambient temperature is higher than 27℃, the time should be shortened to 15 days.

5. During shutdown, the storage temperature of the membrane system should be controlled at (5-45) °C;

6. When the system is used again, please use low-pressure, high-flow product water to flush the membrane system for more than 1 hour, then use high-pressure flushing (5-10) minutes until the product water is qualified; Note that before flushing, all product water discharge valves of the membrane system should be opened to prevent back pressure and unqualified product water from entering the water tank.