现代化大都市供水管网水质监测及评价——以国内某大城市为例

供水管网是影响供水水质的重要因素,特别是在拥有复杂供水管网的现代化大都市。以国内某现代化大都市供水管网为研究对象,该市拥有普通自来水供水系统和饮用净水供水系统,分别建立了水质监测系统,并根据提出的供水管网水质监测点布置原则确定了水质监测点的位置、数量及监测频率、指标;通过从2009年6月至2010年1月为期8个月的水质监测,共采集了560份水样数据,据其对该大都市的供水管网水质进行了分析评价。结果显示:供水管网对普通自来水及饮用净水水质都会产生不良影响;普通饮用水经过管网传输,细菌总数升高甚至超标,特别是在供水管网末梢及两水厂供水交界处;饮用净水的不合格项目为细菌总数和浑浊度,其在距离水厂越近的区域水质越好。

Water Quality Monitoring and Evaluation for Potable Water Distribution Systems in Modern Metropolis:A Case Study of a City in China

This paper reported on a survey conducted in a Chinese modernized big city,where water distribution systems of both common tap water and direct drinking water are available,for investigating the potable water quality in terms of turbidity,total bacteria count and residual chlorine.The survey carried out from June 2009 to January 2010 involved sampling of 560 water samples(260 each for common tap water and direct drinking water systems).Results from the analysis and evaluation of the water quality data showed that,in general,water deteriorated to some extent through the distribution networks from the water works;some of the samples,which were collected at the end of piping of the common tap water system and the intersection of piping connected to different water works,even indicated the failure in compliance with the relevant standard with respect to total bacteria count and turbidity.Ordinarily,the nearer the place from the water works where potable water was supplied,the better the quality of water from the water distribution system.