2013—2014年林芝市集中式供水水质监测结果

Monitoring results of water quality of centralized water supply in Linzhi City from 2013-2014

目的了解林芝市城市和农村集中式供水工程水质卫生状况,为加强饮用水安全管理提供依据。方法对2013—2014年林芝市城市和农村集中式供水监测数据进行分析,每一个监测点于枯水期和丰水期分别采样1次。结果共检测集中供水水样426份,合格水样61份,合格率14.32%（61/426）;城市集中式供水合格率为36.49%（27/74）,农村集中式供水合格率9.66%（34/352）,其差异有统计学意义（χ~2=35.87,P〈0.05）;各县（区）之间水质合格率差异有统计学意义（χ~2=15.64,P〈0.05）;丰水期合格率18.31%（39/213）,枯水期合格率10.33%（22/213）,两者差异有统计学意义（χ~2=5.53,P〈0.05）;出厂水合格率9.79%（19/194）,末梢水合格率18.10%（42/232）,差异有统计学意义（χ~2=5.95,P〈0.05）;大型集中式供水合格率32.00%,小型集中式供水合格率11.97%,差异有统计学意义（χ~2=14.43,P〈0.05）。结论林芝市集中式供水水质合格率较低,建议水利部门与卫生部门加强沟通,从水源头解决水质问题,同时加强集中式供水工程的监管,特别是小型集中式供水单位的供水设施,保障居民能喝上安全放心的水。

[Objective]TTo understand the sanitary status of water quality of urban and rural centralized water supply projects in Linzhi City,provide the basis for strengthening the safety management of drinking water.[Methods]The monitoring data of urban and rural centralized water supply projects in Linzhi City from 2013-2014 were analyzed,and the sampling was respectively performed in dry season and wet season in every monitoring point.[Results]Totally 426 samples from centralized water supply projects were monitored,and 61 were qualified,with the qualified rate of 14.32%（61/426）. The qualified rate of urban and rural centralized water supply projects was 36.49%（27/74）and 9.66%（34/352）respectively,and the difference was statistically significant（χ~2=35.87,P〈0.05）. The difference in the qualified rate of water quality was statistically significant among different districts/counties（χ~2 =15.64,P〈0.05）. The qualified rate in wet season and dry season was respectively 18.31%（39/213） and10.33%（22/213）,and the difference was statistically significant（χ~2=5.53,P〈0.05）. The qualified rate of factory water and peripheral water was respectively 9.79%（19/194）and 18.10%（42/232）,and the difference was statistically significant（χ~2=5.95,P〈0.05）. The qualified rate of large and small centralized water supply projects was respectively 32.00% and 11.97%,and the difference was statistically significant（χ~2=14.43,P〈0.05）.[Conclusion]The qualified rate of centralized water supply projects is low in Linzhi City. It is suggested that water conservancy department and health department should strengthen communication to resolve the water quality problem from the water sources, strengthen the supervision of centralized water supply project,especially water supply facilities in small centralized water supply project,to ensure the safety of drinking water.