Application of rejection enhancing agents (REAs) that do not have cloud point limitations on desalination membranes
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United States of America Patent
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Dec 22, 2015
Grant Date -
Apr 5, 2012
app pub date -
Oct 4, 2010
filing date -
Oct 4, 2010
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Abstract
Methods of treating used or degraded reverse osmosis membranes post-production are provided. The membranes can be treated online or offline. The reverse osmosis membranes are cleaned and then contacted with a rejection enhancing agent solution that includes polyvinylpyrrolidone or polyvinylalcohol. The reverse osmosis membrane is then contacted with a tannic acid solution to produce a reconditioned reverse osmosis membrane having reduced defects. The treatment can take place at temperatures greater than 34° C. because the polyvinylpyrrolidone and polyvinylalcohol rejection enhancing agents used do not have cloud point limitations.
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