石家庄市2008-2010年二次供水水质状况分析

Analysis of the Health Safety Status of Secondary Water Supply from 2008 to 2010 in

目的检验分析石家庄市生活饮用水二次加压供水水质状况,为及时消除隐患,科学指导饮用水安全提供参考依据。方法按照《生活饮用水标准检验方法》(GB/T5750-2006)对2008-2010年上半年生活饮用水中1 186份二次水的29项理化指标和4项微生物指标进行检测分析。结果 2008年、2009年和2010年,二次加压供水水质的合格率分别为61.52%(323/525),85.75%(373/435),87.61%(198/226),合格率间差异有统计学意义(x2=97.72,P<0.01)。主要的不合格指标为游离氯、总硬度、硝酸盐(以氮计)、菌落总数、总大肠菌群、耐热大肠菌群和大肠埃希氏菌。结论石家庄市二次水合格率偏低,但合格率有逐年升高趋势。今后应加大对二次水质量的监督检查,充分保障居民的饮水安全。

Objective To detect and analyze the drinking water conditions of secondary water supply in Shijiazhuang,and eliminated hidden dangers,so as to provide scientific guide for drinking water safety.Method 1 186 samples of secondary water were analyzed for twenty-nine physicochemical and four microbiological parameters during the period from 2008 to 2010 with reference to drinking water quality standards（GB/T5750-2006）.Results The qualified rate of secondary water were 61.52%（323/525）,85.75%（373/435）,87.61%（198/226） from 2008 to 2010 respectively.significant difference were found among them（x2=97.72,P0.01）.The unqualified parameters of secondary water investigated were mainly residual chlorine,total hardness,NO3-,total plate count,total coliform;thermotolerant coliforms and escherichia coliforms.Conclusions The qualified rate of secondary water of Shijiazhuang was lower,but it had a improve tendency year by year.In order to ensure the safety of drinking water fully,supervision and inspection of secondary water should be enhanced in the future.