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对 3个县共 10个改水村和 12个非改水对照村的分散式给水和以深井为主的小型自来水末梢水定点进行理化指标、微生物的检验和Ames试验 ,结果表明 ,改水前分散式给水细菌总数和总大肠菌群符合“农村实施‘生活饮用水卫生标准’准则”(以下称“准则”)一级标准的合格率只有 10 %和 11 4% ;而改水后提高到 45 %和 70 % ,但微生物超标率仍然偏高。水质卫生指数评价结果分散式给水主要分布在 4～ 6级水 (共占81 6 % ) ;改水后主要分布在 1～ 3级水 (共占 6 0 0 % )。去除微生物的理化水质卫生指数分析结果 ,深井集中供水末梢水5、6级仍占 18 8% ,说明深井集中供水的非微生物的安全性值得重视。Ames试验结果分散式给水均为阳性 ,其强弱顺序为淮河水、朝阳河水 >沟塘水 >浅井水 ,有一深井自来水末梢水亦为阳性 ,表明深井集中供水的管网污染是最主要的问题
Physical and chemical indicators, microbiological tests and Ames test were carried out on the dispersed water supply of the tap water and the tap water of the small tap water in 10 villages in 10 counties and 12 non-diversion water-control villages in 3 counties. The results showed that before water diversion The total number of types of water supply bacteria and total coliform bacteria in line with the “rural drinking water implementation of the standards of health” guidelines (hereinafter referred to as “guidelines”) a pass rate of only 10% and 114%; and after changing the water to 45 % And 70%, but the microbial over-standard rate is still high. Results of Evaluation of Water Quality Hygienic Index Distributed water supply is mainly distributed in grades 4 to 6 (a total of 81 6%), while water is mainly distributed in grades 1 to 3 (a total of 600%). Results of physical and chemical hygienic index analysis of microorganisms removed still showed that the density of water in the deep well centralized water still accounted for 18.8% at the end of the fifth and sixth grades, indicating that the safety of non-microorganisms for centralized water supply in deep wells deserved attention. Ames test results were decentralized water supply were positive, the strength of the order of the Huaihe River, Chaoyang River water> Gou pond water> shallow well water, there is a deep well tap water is also positive, indicating that the deep well water supply pipe network pollution is the most important problem