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目的了解昆山市集中式供水(区域供水)的水质现况。方法按照《生活饮用水标准检验方法》(GB/T5750-2006)对2009年昆山市集中式供水单位水源水、出厂水、末梢水进行水质检测、分析。结果 2009年共采集水样258份,合格253份,样品合格率99.2%。共检测5 990个项次,合格项次5 982个,项次合格率99.9%。其中水源水和出厂水样品合格率均为100%,末梢水样品合格率为97.5%。对末梢水不合格项目菌落总数和游离余氯按照监测点级别不同进行方差分析,市级及镇级游离余氯含量较高,菌落总数较低;村级余氯含量较低,菌落总数相对较高,甚至不达标。结论昆山市区域供水水质稳定、合格率高,特别是大大提高了农村饮用水水质状况。但也存在着整个供水管网游离余氯含量分布不均的现象,建议市自来水集团公司根据存在问题及时改进水处理工艺,进一步提高供水水质。
Objective To understand the water quality of Kunshan centralized water supply (regional water supply). Methods According to the Standard Test Method for Domestic Drinking Water (GB / T5750-2006), the water quality of centralized water supply units in Kunshan City in 2009 was tested and analyzed. Results A total of 258 water samples were collected in 2009, of which 253 were qualified, with a passing rate of 99.2%. A total of 5 990 tests were conducted, with 5 982 qualified exams passed, with a pass rate of 99.9%. Among them, the pass rate of water source and ex-factory water samples were both 100% and the pass rate of peripheral water samples was 97.5%. Analysis of variance of total number of colony and free residual chlorine in substandard projects according to the different monitoring points showed that free residual chlorine content was higher in municipal and township level and the total number of colonies was lower; residual chlorine content in village was lower, total number of colonies was relatively High, not even standard. Conclusion The quality of water supply in Kunshan is stable and the pass rate is high. In particular, the drinking water quality in rural areas is greatly improved. However, there is also the phenomenon of uneven distribution of free residual chlorine in the water supply network. It is suggested that Municipal Water Supply Group promptly improve the water treatment process according to the existing problems to further improve the quality of water supply.