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In a Paris suburb, raw water monitoring conducted since 2000 revealed the presence ofCryptosporidium. A risk assessment was conducted andestablished that the elimination of Cryptosporidium would not be sufficient while complying with thenew bromate standards. Ultraviolet (UV) irradiation offers a cost-effective approach to achieve highdisinfection and appeared to be an appropriate alternative for the disinfection of surface water.The question of where and how UV should be integrated in an existing water treatmenttrain was discussed, combining disinfection byproduct impact on downstream processesand cost considerations. It was found that UV would meet the disinfection needs ofNeuilly-sur-Marne SWTP without photolysis of pesticides, production of nitrates, ornegative impact on downstream process. Results from pilot testing have shown that the best UVlocation for water quality and cost considerations would be after GAC filtration. LP or MPlamp technologies could be used and their impact on water quality appeared to be close butin France, the MP system has to be authorized by water authorities before implementation. AUV step will be implemented in the Neuilly-sur-Marne SWTP in 2008. Includes 17 references, tables, figures.

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Edition: Vol. - No. Published: 06/17/2005 Number of Pages: 13File Size: 1 file , 270 KB