Abstract

Advanced water treatment is commonly used to remove micropollutants such as pesticides, endocrine disrupting chemicals, and disinfection byproducts in modern drinking water treatment plants. However, little attention has been paid to the changes in the genotoxicity of substances remaining in the water following the different water treatment processes. In this study, samples were collected from three drinking water treatment plants with different treatment processes. The treated water from each process was analyzed and compared for genotoxicity and the formation of organic compounds. The genotoxicity was evaluated by an umu test, and the acute and chronic toxicity was analyzed through Ecological Structure- Activity Relationship (ECOSAR). The results of the umu test indicated that biological activated carbon reduced the genotoxicity by 38%, 77%, and 46% in the three drinking water treatment plants, respectively, while chlorination increased the genotoxicity. Gas chromato-graph-mass spectrometry analysis revealed that halogenated hydrocarbons and aromatic compounds were major contributors to genotoxicity. The results of ECOSAR were not consistent with those of the umu test. Therefore, we conclude that genotoxicity cannot be determined using ECOSAR.

中文翻译：

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三种不同水处理程序的饮用水处理厂处理的水的遗传毒性比较

摘要

在现代饮用水处理厂中，高级水处理通常用于去除微量污染物，例如农药，破坏内分泌的化学物质和消毒副产物。然而，很少有人关注在不同的水处理过程之后残留在水中的物质的遗传毒性的变化。在这项研究中，从三个具有不同处理工艺的饮用水处理厂收集了样品。分析并比较了每个过程中的处理后水的遗传毒性和有机化合物的形成。通过umu试验评估遗传毒性，并通过生态结构-活性关系（ECOSAR）分析急性和慢性毒性。umu的结果试验表明，生物活性炭分别在三个饮用水处理厂中分别降低了38％，77％和46％的遗传毒性，而氯化作用则增加了遗传毒性。气相色谱-质谱分析表明，卤代烃和芳族化合物是造成遗传毒性的主要因素。ECOSAR的结果与umu检验的结果不一致。因此，我们得出结论，使用ECOSAR无法确定遗传毒性。