本研究报告了在每个处理过程（包括预氯化絮凝、砂滤和加氯）后，205 mgd（776 ML/d）水处理厂内肠道病毒的发生情况。在整个过程中，肠道病毒和轮状病毒的平均减少率分别为81%和93%。肠道病毒的去除率最高发生在预氯化澄清和过滤期间，轮状病毒的减少率最高发生在预氯化澄清和成品水后氯化之后。肠道病毒或轮状病毒可从含>0的成品水样中分离出24%。每升2毫克氯，符合大肠菌群（每100毫升1个）和浊度（1个ntu）标准。虽然主要的工厂缺陷可能是成品水中病毒发生的原因，但研究结果表明，具有可测量的游离余氯水平且符合大肠菌群和浊度标准的成品水不能被认为是无病毒的。 包括30个参考文献、表格和图表。

This study reports on the occurrence of enteric viruses within a full-scale 205 mgd (776 ML/d) water treatment plant following each treatment process, including prechlorination-flocculation, sand filtration, and chlorination. Reduction of enteroviruses and rotaviruses averaged 81 and 93 percent, respectively, for the complete process. The highest removal of enteroviruses occurred during prechlorination-clarification and filtration, and the highest reduction in rotaviruses occurred after prechlorination-clarification and postchlorination of the finished water. Enteroviruses or rotaviruses could be isolated from 24 percent of the finished water samples containing >0.2 mg per liter levels of chlorine and meeting coliform bacteria (1 per 100 mL) and turbidity (1 ntu) standards. Although major plant deficiencies may have been responsible for the occurrence of viruses in the finished water, results of the study indicate that finished water, with measurable levels of free residual chlorine and meeting standards for coliform bacteria and turbidity, cannot be assumed to be virus free. Includes 30 references, tables, figure.