The variation of microbiological index (e.g.bacterial count) in the treatment process of a drinking water plant was investigated.The results clearly indicated that the process of this plant can guarantee the microbial safety of drinking water.Coagulation/sedimentation unit was the key step for bacteria and viruses removal.The removal efficiency of bacterial count,coliform bacteria,MS2 and Phix174 by coagulation/sedimentation was 80.53％,73.53％,99.10％ and 98.50％ respectively.Sand filtration was efficient in removal of bacteria by physical separating,but viruses.Due to the strong oxidative ability of ozone,no bacteria and viruses were detected after ozonatin.After biological activated carbon (BAC) unit,22 cfu/ml of bacterial count,5 pfu/100 L of MS2 and 10 pfu/100 L of Phix174 leaked from BAC filter.No bacteria and viruses were detected after post-disinfection and in the finish water.%通过对某饮用水厂的水处理工艺过程进行采样检测,调查研究在水处理过程中细菌等微生物学安全性指标的变化情况.研究表明,水厂采用的臭氧活性炭复合型水处理工艺可较好地保障饮用水的微生物学安全性.混凝沉淀工艺是去除微生物的关键步骤.在该工艺段,细菌、总大肠菌群、MS2和Phix174噬菌体的去除率分别高达80.53％、73.53％、99.10％和98.50％.砂滤工艺可通过物理截留作用在一定程度上去除水体中的细菌微生物,但对于粒径更小的病毒则无显著的去除效果.臭氧氧化处理可100％灭活水体中的细菌和病毒.而生物活性炭处理后出现了微生物泄露的情况,分别检出细菌总数为22 cfu/ml,MS2和Phix174效价分别为5、10 pfu/100 L.但经最后的氯化消毒处理后,水厂出水中无细菌和病毒检出.
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