Water Science & Technology Vol 55 No 1-2 pp 241–250 © IWA Publishing 2007 doi:10.2166/wst.2007.008
Quantitative evaluation and application of Cryptosporidium parvum inactivation with ozone treatment
M. Cho*,** and J. Yoon**
*School of Chemical and Biological Eng., Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul, , 151-742, Korea
**Korea Interfacial Science and Engineering Institute, Yangjae-dong, Seocho-gu, Seoul, , 137-899, Korea (E-mail: jeyong@snu.ac.kr)
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 “CTlag” 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.
Keywords: Cryptosporidium parvum; kinetics model; ozone disinfection
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