AWWA JAW68263

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.

Product Details

Edition:

Vol. 100 - No. 7

Published:

07/01/2008

Number of Pages:

6

File Size:

1 file , 440 KB