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一、管网二次污染及产生的危害在供水过程中,水在净水厂经过严格的净化后,送入配水管网中的水的各项水质指标都必须达到国家饮用水质标准。但是管网中水的各种微量化学物质在管道中进行反应,不稳定的水质也逐步地产生微量的化学性沉淀,供水质中的铁、钙、镁、锰和微生物等物质沉积于管内壁,形成了“后混凝”层。腐蚀性水将铁氧化成氢氧化铁或氧化铁沉
First, the network secondary pollution and the hazards In the water supply process, the water purification plant undergo a rigorous purification, water distribution network into the water quality indicators must meet the national drinking water quality standards. However, the pipe network of trace chemicals in the pipeline reaction, unstable water quality also gradually produce traces of chemical precipitation, water quality in the iron, calcium, magnesium, manganese and other substances deposited in the tube wall , Forming a “post-coagulation” layer. Corrosive water oxidizes iron to ferric hydroxide or ferric oxide