2019年德阳市农村饮用水监测结果分析

Analysis on the Surveillance Results of Drinking Water of Countries in Deyang City in 2019

目的掌握德阳市饮用水水质情况,为保障人群饮用水安全提供科学依据。方法2019年在德阳市选取农村水厂和农村自建设施供水单位设立312个农村饮用水监测点,在枯水期和丰水期分别开展水质检测,并调查供水单位基本情况,合格率的比较采用卡方检验。结果2019年德阳市农村饮用水样品合格率为77.53%(490/632),其中出厂水样品合格率为75.34%(165/219),高于末梢水样品合格率78.69%(325/413),差异无统计学意义(χ^2=0.92,P>0.05);枯水期样品合格率为82.59%(261/316),高于丰水期样品合格率为72.47%(229/316),差异有统计学意义(χ^2=9.30,P<0.05);以地下水为水源的样品合格率为81.18%(384/473),高于以地表水为水源的样品合格率66.67%(106/159),差异有统计学意义(χ^2=14.40,P<0.05);农村学校水样合格率为72.95%(178/244);农村供水单位消毒设备拥有率为75.81%;总大肠菌群、肉眼可见物、菌落总数等指标是主要不合格指标。结论微生物超标是德阳市农村饮用水的主要问题,消毒设施不足可能是造成微生物指标超标的主要原因。建议农村学校使用水质处理器,以保证饮用水安全。

Objective To understand the situation of the quality of local drinking water in Deyang city,and to provide the scientific basis to ensure the safety of drinking water for public.Methods In 2019,the water plants and water supply units with self-built facilities in the countries of Deyang city were selected,and about 312 rural drinking water monitoring points were set up to carry out water quality testing in dry season and wet season respectively,and the basic situation of water supply units were investigated.The chi-square test were used to compared the qualified rate.Results In 2019,the qualified rate of rural drinking water samples in Deyang city was 77.53%(490/632),the qualified rate of finished water samples(75.34%,165/219)was higher than that of terminal tap water samples(78.69%,325/413),the difference was no statistically significant(χ^2=0.92,P>0.05),the qualified rate of samples of dry season(82.59%,261/316)was higher than that of wet season(72.47%,229/316),the difference was statistically significant(χ^2=9.30,P<0.05);The qualified rate of the sample of groundwater was 81.18%(384/473)which was higher than that of surface water(66.67%,106/159).The difference was statistically significant(χ^2=14.40,P<0.05).The qualified rate of water samples in rural schools was 72.95%(178/244).The ownership rate of disinfection equipment in rural water supply units was 75.81%.The main unqualified indexes were total coliform group,visual objects to naked eyes and total number of colonies.Conclusion Overload microorganism is the main problem of local drinking water in the countryside of Deyang city.Lacking of disinfection facilities may lead to the overload of microorganism.It is suggested that rural schools use water quality processors to ensure the safety of drinking water.