Water Supply Vol 2 No 5-6 pp 381–386 © IWA Publishing 2002
Optimum location of an ultraviolet step in a surface water treatment plant
C. Lemoine*, D. Gatel** and J. Cavard***
*Vivendi Water, Generale des Eaux, 32, place Ronde - Quartier Valmy, 92982 Paris la Défense, France (E-mail: cyrille.lemoine@generale-des-eaux.net)
**Vivendi Water, Generale des Eaux, 32, place Ronde - Quartier Valmy, 92982 Paris la Défense, France
***SEDIF
ABSTRACT
To meet the new DBP rules, ozone doses will have to be minimized to control bromate formation. In some surface water treatment plants, this situation may become of concern, since disinfection will have to be maintained at the current level. Alternative disinfection means such as UV have therefore to be evaluated, and this study was designed to evaluate the impact of MP-UV on water quality parameters such as atrazine, BDOC or nitrites, to determine whether such a treatment step should be inserted before or after the current GAC filtration unit. According to the results shown here, this question is not an issue under conditions needed for Cryptosporidium inactivation.
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