ABSTRACT Nematodes are among the organisms most commonly found in treated water. Although they are believed to be harmless, colonization of nematodes by pathogenic bacteria may transform them into harmful contaminants of the drinking water. Thus, efficient disinfectants must be applied to inactivate and remove nematodes. In the present study, nematode inactivation using different concentrations of ozone, chlorine dioxide, and chlorine for different exposure times are described. Three different disinfection models were tested. Based on experimental data, the best statistically significant relationship between mortality of nematodes in probits (Y), concentrations of disinfectants mg/L (C), and the exposure times in minutes (t) was established as Y = a*log(C) + b*log(t) + c. The estimated values of regression coefficients a, b, and c were 6.89, 0.76, and 1.13 for ozone, 0.66, 1.23, and 5.28 for chlorine dioxide and 1.59, 0.92, and 3.06 for chlorine, respectively. Comparison of the predicted LC(90) molar concentrations of the investigated disinfectants, chlorine dioxide, ClO2, was found to be the most effective disinfectant, followed by ozone, O3, while chlorine, Cl2, was the least efficient disinfectant for inactivation of nematodes.

中文翻译：

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存在臭氧、二氧化氯和氯的饮用水中线虫的死亡率

摘要 线虫是处理过的水中最常见的生物之一。尽管它们被认为是无害的，但病原菌对线虫的定殖可能会将它们转化为饮用水中的有害污染物。因此，必须使用有效的消毒剂来灭活和去除线虫。在本研究中，描述了使用不同浓度的臭氧、二氧化氯和氯在不同暴露时间下灭活线虫。测试了三种不同的消毒模型。根据实验数据，线虫死亡率 (Y)、消毒剂浓度 mg/L (C) 和暴露时间 (t) 之间的最佳统计显着关系确定为 Y = a*log(C) + b*log(t) + c。回归系数 a、b 和 c 的估计值为 6.89、0.76、臭氧为 1.13，二氧化氯为 0.66、1.23 和 5.28，氯分别为 1.59、0.92 和 3.06。比较所研究消毒剂的预测 LC(90) 摩尔浓度，二氧化氯 ClO2 是最有效的消毒剂，其次是臭氧 O3，而氯 Cl2 是灭活线虫效率最低的消毒剂。