2011年大连市农村生活饮用水水质卫生监测结果分析

目的了解农村生活饮用水水质卫生状况，为今后改善农村饮用水卫生状况和保障农村居民生活饮用水安全提供科学依据。方法2011年3—8月随机选择大连市250处农村集中式供水工程进行基本情况调查，对每处出厂水和末梢水进行采样检测。结果本市供水方式以分散式供水为主，农村集中式供水以地下水为主，完全处理的工程占2．09％。抽检1000份水样，在不计算消毒指标的情况下，总合格率为73．80％，枯水期和丰水期水质合格率分别为80．80％和66．80％，出厂水和末梢水水质合格率分别为75．00％和72．60％。微生物和硝酸盐超标较严重，其中总大肠菌群、菌落总数、硝酸盐、耐热大肠菌群合格率分别为93．20％、91．40％、83．70％、75．00％。结论大连农村集中水供水工程水消毒处理设施不完善，水质合格率低，微生物指标和硝酸盐超标率高，饮用水安全存在一定的隐患。

Sanitary monitoring of drinking water in rural areas of Dalian city 2011

Objective To investigate the health situation of village concentrated water supply, provide scientific basis for improving rural drinking water hygiene and protection of drinking water safety in rural areas. Methods From March to August in 2011 ,two hundred and fifty concentrated water supply sites were selected randomly in villages, and their basic situation was investigated. The source and peripheral water of each site was detected. Results The decentralized water supply was major source of the water supply in Dalian, and ground water was major source of countryside concentrated sup- ply water, the proportion of complete treated engineering water was 2.09%. In the 1 000 detected water samples ,in the case of no sterilization, the total qualification rate was 73.80% , the total qualified rates of drought period and wet season were 80. 80% and 66. 80% ;The qualification rates of source and peripheral water were 75.00% and 72. 60%. The microbes and nitrate exceeded national standard obviously, and coli group , the total number of colony, nitrogen and heat - proof coli group also exceeded standards obviously, which qualified rates were 93.20% ,91.40% ,83. 70% and 75.00%, respectively. Conclusion The water disinfection facilities of rural central water supply project is not perfect in Dalian, low qualified rate of water, microbial indicators and nitrate exceeding the national standard is high so that safety of drinking wa- ter has some hidden troubles.