饮水缓释消毒片杀灭水中大肠杆菌及控制菌落总数的效果评价

Sterilization Efficiency of a New Slow Release Type Disinfectant for E.coli in Drinking Water

目的评价实验室制备的新型饮水缓释消毒片杀灭水中大肠杆菌及控制菌落总数的效果。方法研究不同有效氯浓度(0.1、0.3和0.5 mg/L)、pH值(6.5,7.0和8.5)、水温(5、20和30℃)、有机物(以色度计,0、15、20度)分别作用人工感染大肠杆菌悬液(5×102～5×103 cfu/ml)的水样15、30 min后,饮水缓释消毒片对水中大肠杆菌杀灭和菌落总数控制的效果。结果本试验中所用的饮水缓释消毒片,当有效氯浓度达到0.3 mg/L以上作用30 min时,对水中大肠杆菌杀灭及菌落总数控制的效果较好,且pH值、水温和有机物(色度)对缓释消毒片杀灭水中大肠杆菌及控制菌落总数的效果无影响。结论饮水缓释消毒片消毒后水样能达到GB 5749—2006《生活饮用水卫生标准》中微生物学指标的要求,可较好地杀灭水中大肠杆菌及控制菌落总数。

Objective To study the sterilization efficiency of a new style slow-release disinfectant to total count of E.coli and bacteria.Methods The concentration of active chlorine was determined by iodination.The sterilization efficiency for E.coli was observed,including the influence of concentration of active chlorine（0.1,0.3 and 0.5 mg/L）,pH value（6.5,7.0 and 8.5）,water temperature（5,20 and 30 ℃） and chroma（0,15 and 20）.Results When the concentration of active chlorine was over 0.3 mg/L,the sterilization efficiency was not affected by the factors which were studied.Conclusion The water disinfected by the slow-release disinfectant can meet water quality standard.