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 dechlorination upstream of the RO or EDI system.
By atg UV Technology based in Wigan, UNITED KINGDOM.
Studies have proven that chlorine use has negative consequences due to the formation of byproducts, i.e. chlorinated organic compounds and chloramines. Irritation of eyes and mucous membranes, drying out the skin as well as “chlorine smell” are well known troubles. However, these byproducts also accelerate the corrosion in pool halls and significant risk is given by their toxicity (chloramines, combined chlorine) and/or carcinogenicity. Higher rate of asthma prevalence is one of the consequences. These are the reasons why the combined chlorine content - as a marker of chlorination byproducts presence - is to be monitored and why its limit values are specified by authorities. To meet the limits can be tedious and expensive because more water has to be changed and heated up. Chlorine disinfection is not sufficient to prevent infections caused by some waterborne pathogens as dangerous protozoan parasites Cryptosporidium parvum and Giardia lamblia.
By LIFETECH based in Brno, CZECH REPUBLIC.
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