Quantitative evaluation and application of Cryptosporidium parvum inactivation with ozone treatment

Abstract

Despite a wealth of studies concerning the factors affecting the inactivation of Cryptosporidium parvum on ozone disinfection, practical approaches for predicting the inactivation level on ozone treatment system and determining the required ozone dose or contact time to achieve the required inactivation level remain unclear. When modified version of the "Delayed Chick-Watson model" was applied, the results show that Cryptosporidium parvum inactivation was well fitted with one unique line as "C̄Tlag" and "inactivation slope" for several water parameters and water types. Thus, this study suggests quantitative methodology for predicting the Cryptosporidium parvum inactivation level with observation for the contact time of ozone and Cryptosporidium parvum and ozone residual. © IWA Publishing 2007.