Measurement of OH radical CT for inactivating Cryptosporidium parvum using photo/ferrioxalate and photo/TiO2 systems |
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Authors: | Cho M Yoon J |
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Institution: | School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA; Korea Interfacial Science and Engineering Institute, Yangjae-Dong, Seocho-gu, Seoul, Korea; School of Chemical and Biological Engineering, College of Engineering, Seoul National University, Sillim-Dong, Gwanak-gu, Seoul, Korea |
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Abstract: | Aim: This study investigates the inactivation of Cryptosporidium parvum using the OH radical and reports the OH radical CT (OH radical concentration × contact time) values for C. parvum inactivation. Methods and Results: Although a wealth of information has demonstrated the efficacy of the microbial inactivation activity of the OH radical, no studies have performed a quantitative estimation of the OH radical for C. parvum inactivation. The CT value of the OH radical required for 2 log C. parvum inactivation was measured with two OH radical‐generating systems, photo/ferrioxalate and photo/TiO2. The OH radical was approx. 104–107‐fold more effective for microbial inactivation than other popular chemical disinfectants such as ozone, chlorine dioxide and free chlorine. Conclusions: The OH radical appears to be suitable for microbial inactivation with a calculated CT value required for 2 log C. parvum inactivation of 9·3 × 10?5 mg min l?1. Significance and Impact of the Study: This study is the first report of an investigation on the role of the OH radical in the photo/ferrioxalate and photo/TiO2 systems and on the OH radical CT required for C. parvum inactivation. |
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Keywords: | Cryptosporidium parvum disinfection OH radical photo/ferrioxalate photo/TiO2 |
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