Membranes – Part 2: How Ozone, UV and Other Alternatives Compare to Chlorine for Biocontrol in RO Systems?

By Anne Arza and Jane Kucera

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In Part 1, we discussed the nature of biofouling and some of the chlorine and chlorine-derivatives for biocontrol of reverse osmosis (RO) systems. Here in Part 2, we discuss some non-chlorine oxidizing biocides, non-oxidizing biocides for direct application on polyamide membranes, and some physical/mechanical and operational techniques for biocontrol. Again, the objective of the article is to educate the reader about many of the options available. Keep in mind that each application is unique, and what works for one site may not be optimal for another. In many cases, a combination of techniques is required for optimal control of biofouling in an RO system.

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