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Good cip system Reduce Reverse Osmosis Membrane Fouling with Good CIP Procedures By James McDonald PE CWT Dave Christophersen CWT Chris Howell Originally Published Ultrapure Water April Volume Number An integrated water management strategy to optimize a s

Reduce Reverse Osmosis Membrane Fouling with Good CIP Procedures By James McDonald PE CWT Dave Christophersen CWT Chris Howell Originally Published Ultrapure Water April Volume Number An integrated water management strategy to optimize a system ? s performance utilizes the best technical and operational principals combined with new or existing assets Applying an existing asset to accomplish this goal with simple and economical standard operating procedures is like having your cake and eating it too Reverse osmosis RO systems are used to produce high purity water for boiler makeup water process waters wastewater reuse and numerous other applications In a well-managed system operational parameters are measured on a regular basis to assess functionality of the machine and determine when RO membrane cleanings are required The higher the dissolved and suspended solids in the RO feedwater the more frequent and important the cleanings become Some RO systems do not operate hours a day and are turned o ? for part of the day or week to support the operational requirements of the facility Typically when the RO shuts down the impurities that have been concentrated on one side of the membrane remain in the membrane housing until ushed out with fresh makeup water when the RO starts back up The system is essentially ??put away dirty ? Being ??put away dirty ? can allow for further inorganic deposits to develop or microbiological activity and fouling to increase Both have negative a ?ects on the RO membranes and performance Many RO ? s have clean-in-place CIP equipment installed as an integral part of the system Smaller RO applications may contract to have a CIP performed on an as- needed basis A typical CIP for polyamide membranes is outlined below Pretreatment CTypical CIP Procedure Step Install new cartridge ?lters on the CIP system and make sure that the piping is clean with no stagnant water from previous cleanings and no microbiological build-up Step Mix chemicals in clean high purity water such as demineralized water RO permeate water or condensate If these choices are not available then use soft water The estimated water requirement for the cleaning solution is - gallons per -inch long -inch diameter element Add the chemical cleaning products to the CIP tank Commonly a low pH cleaning is conducted ?rst at a pH of ?? The solution temperature should be increased to ? to ? and maintained during the cleaning Warm or hot water can be used when making the solution and a heater should be maintained in the cleaning solution to stabilize the temperature at ? to ? F Step Drain as much water from the RO system as possible then begin introducing the solution to the ?rst stage of the RO machine Introduce the solution slowly to displace any remaining water in the RO machine to the drain Use a pH or conductivity meter to determine when the water has been ushed from the RO machine and the cleaning solution appears After the cleaning solution has displaced the