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Biological Fouling - Chlorine & Na/Ca HypochloriteAdvanced Reverse Osmosis TechnologyChlorine (Na/Ca hypochlorite, bleach or gas) can be dosed to control biological fouling of the pre-treatment system. If biological contamination is an issue, chlorine can be dosed prior to the pre-treatment system to give a free chlorine residual of 0.2 – 1.00 ppm depending on severity of contamination. Chlorine will destroy polyamide thin film composite membranes. It is essential that ALL chlorine be removed from the feed water prior to entering the membranes (CA membranes can tolerate up to 1ppm free chlorine). Even trace amounts of free chlorine can cause oxidation damage, especially in the presence of metals such as iron. Chlorine can be removed by bisulfite/metabisulfite addition or by the use of carbon filters. For further information or assistance please contact Reverse Osmosis Chemicals International on +44 (0) 161 877 2334 or e-mail info@rochemicals.com.
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