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| Use of oxidation-reduction potential to monitor iron release from corroded iron pipes in drinking water distribution system |
| JIANG Wei1, LIU Jing-qing1, YE Ping2, LI Hang-jia2 |
| 1. Municipal Engineering Research Institute, Zhejiang University, Hangzhou 310058, China; 2. Jiaxing Jiayuan Water Supply Company, Jiaxing 314000, China |
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Abstract Pipe scale samples were obtained from two pilot-scale drinking water distribution systems in an eastern city, and analyzed with SEM, EDS and XRD. Results indicate that physicochemical characteristics of two pipe scale are similar; Pipe scale surface is covered with shell-like layer; Major elements are Fe, O and C, and main substances are Fe3O4 and FeOOH. By pilot study, correlation between oxidation-reduction potential (ORP) and iron release in stagnant water was investigated in different seasons, and was compared with iron release correlations of dissolved oxygen (DO) and turbidity. Results show that although pipe scales characteristics are similar, changes in water quality during transmission can cause significant differences in iron release. Iron release from the same pipe was various in different seasons. ORP can be an indicator in predicting iron release. When ORP＞200 mV, iron release is governed and there is no dissolved iron release. When ORP＜200 mV, iron release severely and dissolved iron can release. ORP correlates iron release better than DO.
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Published: 01 April 2015
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氧化还原电位作为铁释放监测参数的中试研究
对东部某市实际管网中2个管网中试的铸铁管管垢样品进行扫描电镜（SEM）、能谱扫描（EDS）和X射线衍射（XRD）分析.结果表明,两点管垢的物理化学特性相似；管垢表面均为受创硬壳层；主要组成元素为Fe、O、C,主要组成物质为Fe3O4、FeOOH等铁氧化物.通过中试对不同季节下水流停滞后氧化还原电位（ORP）与铁释放的相关性进行研究,并将其与溶解氧（DO）和浊度的铁释放相关性进行对比.结果表明,即使管垢条件相似,出厂水在运输过程中的水质条件变化仍能导致铁释放出现明显差异；不同季节中同一管道所产生的铁释放存在差异.ORP可以作为铁释放的监测指标；当ORP＞200 mV时,表明铁释放受到控制,基本没有溶解性铁释放；当ORP＜200 mV时,这表明铁释放量大,会产生溶解性铁释放.ORP的铁释放相关性优于溶解氧.
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