2、 Suspension for 0-2 days

Short term shutdown can be carried out according to normal shutdown procedures, but low-pressure flushing must be performed, and in order to prevent bacterial growth, it is necessary to flush every 24 hours.

3、 Suspension for 2-25 days

1. After shutdown, ensure that the pressure vessel is filled with pure water produced by R0, and close all inlet, concentrate, and production valves to prevent membrane element drying and microbial growth;

When the temperature is above 20 ℃, it is necessary to rinse again every 12 hours; When the temperature is below 20 ℃, rinse again every 24 hours;

3. For surface water or water sources with high microbial pollution, a solution containing 1.0% sodium bisulfite prepared from R0 water should be used to flush the reverse osmosis system. If the membrane elements are soaked in this solution at the same time, the effect will be better and the repeated flushing cycle will be correspondingly extended;

During system shutdown, the temperature should be maintained between 5 ℃ and 45 ℃. Low temperature is beneficial for the preservation of membrane components, but at the same time, the system should be prevented from freezing and freezing.

4、 Long term shutdown for more than 25 days

1. Follow the normal shutdown procedure and rinse the system with product water at low pressure. At the same time, perform a chemical cleaning and sterilization treatment. After cleaning, rinse the system with R0 produced water at low pressure until the conductivity of the concentrated water is consistent with that of the inlet water;

2. Prepare a protective solution containing 1.0% sodium bisulfite using reverse osmosis to produce pure water. Use a chemical cleaning system to cycle and rinse the membrane components, eliminate air from the pressure vessel, and completely immerse the membrane components in the protective solution to prevent them from drying out. Close all inlet valves, concentrate valves, and production valves to prevent air from entering and rendering the protective solution ineffective;

3. Check the pH value of the protective solution every week. When the pH is less than 3, the protective solution should be replaced in a timely manner;

During system shutdown, the temperature should be maintained between 5 ° C and 45 ° C. Low temperature is beneficial for the preservation of membrane components, but at the same time, the system should be prevented from freezing and freezing.