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目的评价2014年和2015年余杭区农村饮水工程质量和水质卫生状况。方法根据GB/T 5750—2006《生活饮用水标准检验方法》要求采集、保存和检测水样,按照GB 5749—2006《生活饮用水卫生标准》要求评价水质。结果两年共检测725份管网末梢水水样,检测合格281份,总合格率为38.76%;枯水期水样检测合格率为42.58%,高于丰水期的34.90%(P<0.05);不合格指标中浑浊度、肉眼可见物、锰、硝酸盐氮和菌落总数合格率均>90.00%,耐热大肠菌群、总大肠菌群和游离余氯的合格率较低,分别为49.66%、47.17%和39.31%。2015年感官性状和一般化学指标超标率0.17%,低于2014年的0.67%(P<0.05)。结论余杭区农村饮水工程水质有待提高,影响合格率的主要是微生物和感官性状指标;建议相关部门加强水源保护与消毒工作。
Objective To evaluate the quality and quality of rural drinking water projects in Yuhang District in 2014 and 2015. Methods According to the requirements of GB / T 5750-2006 Standard Test Method for Domestic Drinking Water, the water samples were collected, preserved and tested. The water quality was evaluated in accordance with the requirements of Sanitary Standard for Drinking Water of GB 5749-2006. Results A total of 725 samples of water were collected from the end of the pipe network in the past two years. The total passing rate was 38.76%. The pass rate of water samples was 42.58% in dry season, which was higher than 34.90% in wet season (P <0.05). Unqualified indicators of turbidity, macroscopic, manganese, nitrate nitrogen and the total number of colonies passing rate were> 90.00%, heat-resistant coliform bacteria, total coliform bacteria and free residual chlorine lower pass rates were 49.66% , 47.17% and 39.31% respectively. In 2015, the exceeding rate of sensory traits and general chemical indicators was 0.17%, down from 0.67% in 2014 (P <0.05). Conclusion The water quality of rural drinking water project in Yuhang District needs to be improved. The main factors affecting the qualified rate are the indicators of microorganisms and sensory traits. Relevant departments are advised to strengthen water source protection and disinfection.