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The author describes a statistical model that can beused to account for the error in estimating the requiredchloramine concentration times time (C ? T) to inactivateCryptosporidium oocysts with ozone followed bychloramine in drinking water. The safety factordescribed in the article can be used to determine whetherthe required C ? T takes account of specific knownuncertainties. The fact that lots are not all identical needsto be accounted for when the safety level of C ? T iscalculated. Because lot variability is accounted for in thecurrent Long Term 2 Enhanced Surface Water TreatmentRule, water utilities may want to use a similarfactor for a sequential inactivation approach that alsotakes lot variability into account. This study shows thata sequential application of ozone and chloramine is apromising alternative to a single application of ozone orchloramine to control C. parvum oocysts in drinkingwater. Water utilities can calculate the required C ? Tfor the secondary disinfectant in order to achieve a specifiedinactivation level of C. parvum oocysts. Includes 10 references, tables, figures.

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Edition: Vol. 100 - No. 7 Published: 07/01/2008 Number of Pages: 6File Size: 1 file , 440 KB