水源切换过程中对给水管网水质的影响研究

在水源切换过程中,由于水源水质不同造成的管网水质化学不稳定,引起水质恶化,发生＂红水＂现象。本文通过实验室模拟实际管网,观察切换水源过程对给水管网水质指标的影响,监测到浊度明显升高从0.32NTU上升到6.38NTU,pH从7.97上升到8.30,电导率从825s·m^-1降到779s·m^-1,总溶解性固体从403mg·L^-1下降到380mg·L^-1,余氯迅速下降从2mg·L^-1下降到0.02mg·L^-1。感官上色度增加,水浑浊有沉淀生成,管网水中铁的含量增加,最大到1.15mg·L^-1严重超标。经分析提高pH、增加碱度、投加缓蚀剂及严格保证出厂水指标等可控制管网水质稳定性。

Effects of Water Sources Switching on Water Quality in Drinking Water Distribution System

During the process of water source switching in drinking water distribution system,due to different water sources caused by chemical instability of the pipe network water,causing deterioration in water quality occurred ＂red water＂ phenomenon.Laboratory simulation of the actual pipe network,observe the process of switching water right to the water distribution network of water quality indicators to monitor the turbidity increased significantly from 0.32NTU up to 6.38NTU,pH increased from 7.97 to 8.30,conductivity from the 825s· m^-1 down to 779s·m^-1,the total dissolved solids from 403mg·L^-1 decreased to 380mg· L^-1,DO from 6.79mg·L^-1 decreased to 6.55mg·L^-1,residual chlorine rapidly decreased from 2mg·L^-1 decreased to 0.02mg·L^-11.Sensory chroma increased,water turbid with sediment generation,iron content in the water pipe network to increase the maximum to 1.15mg·L^-1 severely exceeded.From the analysis,it indicated that with the increase of pH and alkalinity,adding corrosion inhibibors and ensuring the strict targets of treated water,the water in pipe network can be controlled.