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目的了解2011年上海市闵行区居民小区二次供水水质的卫生现状,为监督管理提供科学依据。方法对2011年上海市闵行区居民小区二次供水监测数据进行整理分析,按GB5749-2006《生活饮用水卫生标准》进行评价。结果 559件样品中余氯、浑浊度、菌落总数、总大肠菌群等4项基本指标总体合格率为71.0%,不同街道(镇)样品合格率(54.2%～96.9%)差异有统计学意义(P<0.05)。其中,样品余氯合格率为77.5%,是影响样品总体合格率最主要的因素。该区北、中、南3片的31件样品中检测色度、氯化物、耗氧量、氰化物等17项指标,总体合格率为93.5%,不合格的2件样品分别为菌落总数和总大肠菌群超标。结论 2011年上海市闵行区居民小区二次供水水质不合格的主要原因是余氯含量低、菌落总数和总大肠菌群超标等。应进一步加强居民小区二次供水的卫生管理和监测,提高二次供水的卫生质量。
Objective To understand the status quo of the secondary water quality of residential quarters in Shanghai Minhang District in 2011 and provide a scientific basis for supervision and management. Methods The monitoring data of secondary water supply of residential quarters in Minhang district of Shanghai in 2011 were analyzed and classified according to GB5749-2006 Standard of Drinking Water Quality. Results The overall pass rate of 4 basic indicators of residual chlorine, turbidity, total number of colonies and total coliform in 559 samples was 71.0%, and the passing rate of samples in different streets (towns) was 54.2% ~ 96.9% (P <0.05). Among them, the qualified rate of residual chlorine in the sample is 77.5%, which is the most important factor affecting the overall passing rate of the sample. The 31 samples of 31 samples in the north, middle and south of the district were tested for 17 indicators, including colorimetry, chloride, oxygen consumption and cyanide. The overall pass rate was 93.5%. The unqualified samples were the total number of colonies and Total coliform bacteria exceeded. Conclusion The main reasons for the unqualified water quality of secondary water supply in residential area of Minhang District in 2011 are residual chlorine content, total number of colonies and excessive total coliform bacteria. Health management and monitoring of secondary water supply in residential areas should be further strengthened to improve the hygiene quality of secondary water supply.