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Measurement of OH radical CT for inactivating Cryptosporidium parvum using photo/ferrioxalate and photo/TiO 2 systems
Author(s) -
Cho M.,
Yoon J.
Publication year - 2008
Publication title -
journal of applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 1364-5072
DOI - 10.1111/j.1365-2672.2007.03682.x
Subject(s) - cryptosporidium parvum , hydroxyl radical , chemistry , radical , chlorine , photochemistry , medicinal chemistry , biochemistry , microbiology and biotechnology , biology , organic chemistry
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/TiO 2 . The OH radical was approx. 10 4 –10 7 ‐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/TiO 2 systems and on the OH radical CT required for C. parvum inactivation.