Mobile RO membrane cleaning service

When do I need to clean the RO membrane?

When you notice any ONE of the following changes:

• NPF (Normalized Permeate Flowrate) = Permeate flow rate reduced by 10 – 15%
• NDP (Normalized Differential Pressure) = Differential pressure from 10 – 15%
• NSP (Normalized Salt Passage) = The amount of salt passing through the membrane increases from 10 – 15%

The benefits of the above indicators bring:

• If these limits are exceeded for a long time, it may not be possible to recover as before!
• Helps you plan your membrane cleaning activities proactively
• Determine your plant’s standard membrane washing frequency and stick to it

• Before CIP the RO membrane, you need to run the RO system normally, then record the parameters (TDS, finished product flow, operating pressure, Delta P differential pressure, recovery rate…) here is Main parameters to evaluate the recovery ability of RO membranes after chemical CIP.
• Stop system operation. Turn off water in/out. Connect the system to the CIP system or remove the RO membrane and install it via a portable CIP skid.
• Supply clean water into the CIP tank, up to about 70-75% of the tank capacity, and pre-rinse with clean water. Rinsing with clean water first confirms that the CIP flow path has been adjusted properly.
• Supply CIP chemicals into the CIP tank, the type of chemical will be determined according to the cause of scaling and fouling
• Check the pH in the CIP tank to ensure the pH of the acid cleaner is around 2 and the pH of the alkaline cleaner is around 12. Open all valves on the CIP system.
• Turn on the CIP pump to circulate.
• When the CIP pump is running, some water escapes through the permit product line, so the return pipe should be returned to the CIP tank.
• Check pH about every 10 minutes. Provide additional chemicals if pH changes.
• Run circulation at 30 – 60 and maintain pressure level below 4 bar. You can stop running for 15 – 30 minutes to soak.
• Continuously check the water level in the CIP tank, supply water and chemicals to ensure pH conditions.
• Isolate the CIP system from the system by closing the CIP valves. Discard all remaining water in the CIP system. Clean and preserve the CIP system for future cleanings.
• Reopen the valves on the system. Supply clean water into the system for washing and drain all washing water along the discharge line.
• After rinsing with clean water for about 30 minutes, turn on the system’s water supply pump to wash in operating mode, and drain all finished water.
• Adjust the RO system to normal operating state. Check finished water TDS, running pressure and finished water flow compared to initial results included in the report.