The purpose of de-chlorination is the removal of free chlorine and combined chlorine compounds from potable water, as supplied by municipal water supplies. Chlorine will oxidize the surface of thin film composite polyamide membranes, causing the membrane to lose its ability to repel or reject salts.
As a result, the membranes used in Reverse Osmosis (RO) or Electro-deionisation (EDI) systems will exhibit shorter lifetimes when exposed to chlorine in the water they are treating and membrane manufacturers will usually specify an upper limit to ensure a suitable life of the membrane. As a result, it is usual to use a method of de-chlorination upstream of the RO or EDI system.
De-chlorination by treatment with Medium Pressure UV avoids all the pitfalls associated with both sodium meta-bisulphite and Granulated Activated Carbon. At high doses, UV is very effective at removing free chlorine from water.
Other benefits of using UV for this purpose are: the water receives a high UV disinfection dose; there is a degree of TOC destruction; it eliminates labour and the safety hazard of mixing sodium metabisulphite; it eliminates the risk of introducing micro-organisms onto reverse osmosis membranes (via sodium metabisulphite injection); there is an overall improved water quality at point-of-use.
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