2007-2010年余姚市生活饮用水水质监测情况分析

Analysis on the Drinking Water Quality Monitoring in Yuyao in 2007-2010

目的分析近年来余姚市生活饮用水水质监测结果,为今后饮用水卫生管理提供科学依据。方法对余姚市2007-2010年千吨级以上水厂供应的出厂水和管网水水质监测资料进行统计。结果该地区生活饮用水水质合格率逐年上升(χ2=44.416,P<0.001),且市政水厂水质明显好于乡镇水厂(χ2=68.494,P<0.001),乡镇水厂水质主要不合格指标是感官性状、消毒剂及金属指标等,乡镇水厂中使用液氯消毒的水质合格率显著高于使用二氧化氯消毒或漂粉精消毒的水质合格率(χ2=75.11,P<0.001)。结论余姚市生活饮用水水质总体合格率高且逐年上升,尤其是市政供水,今后监管重点应为乡镇水厂。

Objectives To analyze the quality of drinking water in recent years in Yuyao, and to provide scientific bases for supervising the sanitation of drinking water in the future. Method The surveillance data on the quality of drinking water from larger （more than 1000 twt） tap water plants in Yuyao in 2007 -2010 were analyzed statistically. Results The quality of drinking water in Yuyao was increasing year by year （X^2 = 44. 416, P 〈 0. 001 ）. The quality of water from municipal waterworks was better than that from township waterworks （X^2 = 68. 494, P 〈 0. 001 ）. The unqualified indexes for township waterworks were aesthetic, disinfectant residue and metal. The quality of disinfection with chlorine was the best in township waterworks, comparing with chlorine dioxide and calcium hypochlorite（X^2 = 75. ll, P 〈 0. 001 ）. Conclusions The quality of drinking water in Yuyao was good, especially in municipal waterworks, the focus of regulatory efforts would put on township waterworks in the future.