Inactivation of Cryptosporidium parvum oocysts with chlorine dioxide

被引:68
作者
Ruffell, KM [1 ]
Rennecker, JL [1 ]
Mariñas, BJ [1 ]
机构
[1] Univ Illinois, Dept Civil & Environm Engn, Urbana, IL 61801 USA
关键词
batch reactor; chlorine dioxide disinfection; Cryptosporidium parvum; inactivation kinetics; in vitro excystation; pH dependence; temperature dependence;
D O I
10.1016/S0043-1354(99)00187-6
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The effect of solution pH and temperature on the rate of inactivation of Iowa strain Cryptosporidium parvum (C. parvum) oocysts with chlorine dioxide was determined. Oocyst viability was assessed with a modified in vitro excystation method consistent with animal infectivity data. Inactivation curves were characterized by a lag phase followed by Chick-Watson first order kinetics. The rate of inactivation was essentially the same at pH 6 and 8. CT requirements at pH 10 were approximately 20-30% lower than those at pH 6-8. The magnitude of the lag phase and the inactivation rate constant were both found to ubey Arrhenius law for the experimental temperature ranee of 4-30 degrees C. CT requirements for C. parvum oocyst inactivation were found to increase by an average factor of approximately 3.4 for every 10 degrees C decrease in temperature. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:868 / 876
页数:9
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