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INACTIVATION OF CRYPTOSPORIDIUM PARVUM OOCYSTS WITH OZONE
Rennecker, J. L., B. J. Marinas, J H. Owens*, AND E W. Rice*. INACTIVATION OF CRYPTOSPORIDIUM PARVUM OOCYSTS WITH OZONE. WATER RESEARCH. Elsevier Science Ltd, London, Uk, 33(11):2481-2488, (1999).
Ozone inactivation rates for Cryptosporidium parvum (C. parvum) oocysts were determined with an in-vitro excystation method based on excysted sporozoite counts. Results were consistent with published animal infectivity data for the same C. parvum strain. The inactivation kinetics for C. parvum were characterized by a lag phase followed by pseudo-first order kinetics. The magnitude of the lag phase was affected by the oocyst preparation procedures suggesting that the shoulder in the inactivation curve related to ozone demand created by residual debris. The pseudo-first order rate constant was found to be different for C. parvum oocysts from two different sources, and to obey Arrhenius law for the experimental temperature range of 5 to 30 degrees C.
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Record Details:Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL RISK MANAGEMENT RESEARCH LABORATORY
WATER SUPPLY AND WATER RESOURCES DIVISION
MICROBIAL CONTAMINANTS CONTROL BRANCH