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cleaning, flush residual cleaning agent from the cartridge. Flushing should be performed in a non-recirculating mode, such that the flush water does not reenter the system. Water quality. Cleaning and flush water should contain co.05 mgiL iron, ~25 mg/L calcium and magnesium, and no colloidal silica. Water should be free of particulate matter, oil, and grease. Ideally, UF or RO permeate should be used. Temperature. Cleaning at room temperature (i.e., 20 “C) is NOT recommended. Preferably, cleaning should be performed at 50 “C, to decrease the strength of foulantimembrane surface bonds and to improve solubility of residual feed constituents. Higher temperature cleaning (>60 “C) is not recommended due to potential cleaning chemical/membrane interactions. Time. Recommended cleaning times are given in table 8.1. These times should be used as guidelines. Shorter or longer times may be required depending on the extent of the membrane fouling. In many cases, soaking the membranes overnight improves the effectiveness of the cleaning cycle. Flushing time depends on the cleaning chemical, the membrane pore size, and the total fold-up volume of the system. Chlorine wash cvcles. Chlorine dissipates with time and is rapidly depleted in very dirty operations. A chlorine test kit should be used to check chlorine levels and additional chlorine should be introduced as needed. Safetv. Caustic, acid, bleach, and other cleaning chemicals should be handled with care. Operators should take appropriate precautions to prevent contact with eyes and skin.PDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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