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消毒剂和溶解氧对管网铁释放影响的中试研究

Keywords: 南水北调,水源切换,硫酸根,自由氯,氯胺,溶解氧,铁释放

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Abstract:

针对南水北调中线水源地丹江口水库水调入受水区城市后,可能引起管网铁腐蚀产物释放的问题,从北方某受水区城市的实际管网中挖取了原通地下水的3个地点的铸铁管道,在丹江口搭建了中试模拟系统,开展水源切换以及消毒剂和溶解氧对管网铁释放影响的中试研究。结果表明,实验管道管垢较薄且稳定性较差,在水源切换初期有"黄水"现象发生;增加进水硫酸根浓度,管网系统出水总铁浓度和浊度均有所增加;在0.3~3.6mg/L的范围内改变进水自由氯浓度对实验系统铁释放的影响没有明显的规律;但进水氯胺浓度从1.3mg/L增加到2.0mg/L时,YS系统的铁释放有所升高;进水溶解氧浓度从8mg/L增加到15mg/L时,实验系统的铁释放都有明显的降低,但再增加到20mg/L时,铁释放反而有所升高。

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