s片区供水管网水质调查分析与探讨

Investigation and discussion on water quality of water supply network in the S district

为了掌握某市S片区供水管网水质状况,并为制定供水水质保障计划提供依据,选取一定数量具有代表性的取样点进行现场采样检测分析。结果表明,在供水管网长期稳定运行状态下,绝大部分水质指标均能满足《生活饮用水卫生标准》(GB 5749—2006)要求。但是,由于管网结构因素,存在死水问题。管材对供水水质的影响存在差异性,早期敷设的无内衬灰口铸铁管余氯衰减幅度很大,容易引起水质不达标。老旧管道内防腐层的剥落、结垢也会对水质造成影响。

A certain number of representative sampling sites were selected for on-site sampling detection and analysis,to know the water quality of water supply network in the S district of a city and provide basis for formulating water quality assurance plan.The results showed that most of the water quality indexes could meet the requirements of the Standards for drinking water quality(GB 5749-2006)under the long-term stable operation of water supply network.However,stagnant water existed due to the structural factors of the pipe network.The influence of pipes on the water quality was different.The chlorine content of the unlined gray cast iron pipes laid in the early years was greatly attenuated,which could cause the water quality to exceed the standard.The peeling off and scaling of the anticorrosive coating in the old pipeline also affected the water quality.