Clean Technology 2011

Naturally Chlorine Resistant, High Salt Rejection Cellulose Acetate Reverse Osmosis Membranes

S. Delagah
Bureau of Reclamation, US

Keywords: cellulose acetate membrane, filtration

Abstract:

Cellulose acetate membranes are naturally chlorine resistant providing biofouling control without additional dechlorination unit operations added to the pretreatment train. Currently, polyamide (PA) membranes are predominantly used in desalination reverse osmosis applications since PA membranes have higher transport properties, salt rejection and water flux, than currently available CA membranes. Chlorine is typically used for biofouling control prior to RO operation. Chlorine is an oxidant that causes damage to PA membranes, therefore it requires removal prior to introduction to PA membranes. This additional step adds capital and O&M cost along with increasing the complexity of plant. Another benefit of the CA membrane is its smooth surface as compared to PA, which makes CA a better candidate for treatment of waters containing higher concentration of organic particulates. BOR produced membranes provide a superior CA membrane that is naturally chlorine resistant allowing for easier biofouling control and are a better option than PA membranes for waters with high organic particulate fouling potential. BOR CA membranes aid in growth of membrane filtration by controlling fouling better and increased salt rejection.
 

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