CHEMICAL CLEANING Reverse RO System and EDI System

• CHEMICAL CLEANING Reverse RO System and EDI System

• RO CLEANING – CITRIC ACID
• Preparation of Cleaning solution: 
• Prepare a solution of 2% (By weight) of Citric acid (C₆H₈O₇). This is useful in removing of inorganic scales and organic based colloidal material. Recommended quantity is 7.7 kg Citric acid (100 % powder) which is to be added to 380 liters of dilution water. Adjust the pH using Ammonium Hydroxide to pH of 4.
• Procedure:
• Take RO permeate or DI water in a tank. Ensure that water should be free of chlorine.
• Initially flush some amount of water through the RO pressure vessel for a period of 5 min with reject and permeate to drain.
• Again take fresh RO permeate water or DI water in tank.
• Prepare solution as mention above in tank.
• Connect a hose to concentrate outlet and put other end to cleaning tank.
• Connect a hose to the permeate outlet and put other end to cleaning tank.
• Circulate the chemical for 1 hour from tank to RO using external pump (Not high pressure pump). Ensure that the pressure during cleaning at the inlet of the RO should not exceed 4 bar. This can be done by adjusting the feed valve to the membrane housing.
• After circulation flush the system until RO conductivity is < 20 us/cm.
• RO CLEANING – NaOH
• Preparation of Cleaning solution:
• Prepare a solution of 1 % (By weight) of NaOH & Tipol this is useful in removing of organic foulant of natural organic, colloidal foulant.
• Procedure:
• Take RO permeate or DI water in a tank. Ensure that water should be free of chlorine.
• Initially flush some amount of water through the RO pressure vessel for a period of 5 min with reject and permeate to drain.
• Again take fresh RO permeate water or DI water in tank.
• Prepare solution as mention above in tank.
• Connect a hose to the concentrate outlet and put other end to cleaning tank.
• Connect a hose to the permeate outlet and put other end to cleaning tank.
• Circulate the chemical for 1 hour from tank to RO using external pump (Not high pressure pump). Ensure that the pressure during cleaning at the inlet of the RO should not exceed 4 bar. This can be done by adjusting the feed valve to the membrane housing.
• After circulation flush the system until RO conductivity is < 20 us/cm. 
• EDI Cleaning
• EDI cannot be cleaned with chemical, once EDI chocked it has to be replaced.

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