The occurrence of viruses in conventionally treated drinking water derived from a heavily polluted source was evaluated by collecting and analyzing 38 large-volume (65- to 756-liter) samples of water from a 9 m3/s (205 X 10(6) gallons [776 X 10(6) liters] per day) water treatment plant. Samples of raw, clarified, filtered, and chlorinated finished water were concentrated by using the filter adsorption-elution technique. Of 23 samples of finished water, 19 (83%) contained viruses. None of the nine finished water samples collected during the dry season contained detectable total coliform bacteria. Seven of nine finished water samples collected during the dry season met turbidity, total coliform bacteria, and total residual chlorine standards. Of these, four contained virus. During the dry season the percent removals were 25 to 93% for enteric viruses, 89 to 100% for bacteria, and 81% for turbidity. During the rainy season the percent removals were 0 to 43% for enteric viruses, 80 to 96% for bacteria, and 63% for turbidity. None of the 14 finished water samples collected during the rainy season met turbidity standards, and all contained rotaviruses or enteroviruses.
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机译：通过收集和分析来自9 m3 / s（205 X 10（6）加仑）的38个大体积水样本（65到756升）来评估源自严重污染源的常规处理饮用水中病毒的发生。 [每天[776 X 10（6）升]）水处理厂。使用过滤器吸附-洗脱技术浓缩原水，澄清水，过滤水和氯化水的样品。在23份成品水中，有19份（83％）含有病毒。在干燥季节收集的九个最终水样中没有一个包含可检测的大肠菌总数。在干燥季节收集的九个最终水样中有七个达到浊度，大肠菌总数和总残留氯标准。其中，四个包含病毒。在干旱季节，肠病毒的清除百分率是25％至93％，细菌的清除百分率是89％至100％，浊度的清除百分率是81％。在雨季，肠病毒的清除百分率是0到43％，细菌的清除百分率是80到96％，浊度的清除百分率是63％。在雨季收集的14个最终水样中，没有一个符合浊度标准，并且都包含轮状病毒或肠病毒。
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