Correct operation methods of RO plant

Steps need to be noticed when install the new RO membrane of RO plant

1. First, backwash and rinse the quartz sand and active carbon to make then clean

2. Detect if any residual chlorin in water that may oxidize the membrane. If the residual chlorine exceeds the standard, it need to solved first before installing the membrane.

3. After the membrane be installed, soak the membrane for 1-2 hours, because the soaked membrane is relatively moist then will not be damaged by high pressure.

4. Then start the high pressure pump, the pressure will increase steadily

5. The product water of the first half an hour must be drained, as the protection liquid be added in membrane which smell bad

When should we process Chemical cleaning for RO membrane of RO plant

1. Product water flow decrease more than 10%

2. Product water quality (conductivity) decrease more than 10%

3. The operation pressure increase more than 10%

4. Above situation can not be improved by physical cleaning

Other reasons shall be considered before processing Chemical cleaning for RO membrane of RO plant

1. The damage of pressure controller and high pressure pump

2. Inlet water temperate or quality changed greatly because of season change

3. The pretreatment of RO plant is blocked or damaged

4. The membrane element or O-ring seal of the pressure vesselbe damaged

Common pollutants in RO membrane of RO plant are mainly CaCO3, CaSO4, BaSO4, SrSO4, metal oxides, silicon deposits, organic matter and biological slime. Different pollutants cause different degrees of damage to the membrane, thus the chemical cleaning agents shall be customized for the specific pollutant.

How to process Chemical cleaning (CIP) for RO membrane of RO plant

1. Preparation work: adjust the corresponding valves

2. Acid cleaning: prepare 100-500L clean water with 0.1% HCL in CIP tank, and process circulation

3. Alkali cleaning: prepare 100-500L clean water with 0.1% NaOH in CIP tank, and process circulation

4. Clean water cleaning: adjust the corresponding valves

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