期刊论文详细信息
WATER RESEARCH 卷:46
Morphological and physicochemical characteristics of iron corrosion scales formed under different water source histories in a drinking water distribution system
Article
Yang, Fan1,3  Shi, Baoyou1  Gu, Junnong2  Wang, Dongsheng1  Yang, Min1 
[1] Chinese Acad Sci, State Key Lab Environm Aquat Chem, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
[2] Beijing Waterworks Grp, Ctr Water Qual Monitoring, Beijing 100192, Peoples R China
[3] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
关键词: Corrosion scale;    Morphology;    Magnetite/goethite ratio;    Water source history;    Drinking water distribution system;   
DOI  :  10.1016/j.watres.2012.07.031
来源: Elsevier
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【 摘 要 】

The corrosion scales on iron pipes could have great impact on the water quality in drinking water distribution systems (DWDS). Unstable and less protective corrosion scale is one of the main factors causing discolored water issues when quality of water entering into distribution system changed significantly. The morphological and physicochemical characteristics of corrosion scales formed under different source water histories in duration of about two decades were systematically investigated in this work. Thick corrosion scales or densely distributed corrosion tubercles were mostly found in pipes transporting surface water, but thin corrosion scales and hollow tubercles were mostly discovered in pipes transporting groundwater. Magnetite and goethite were main constituents of iron corrosion products, but the mass ratio of magnetite/goethite (WG) was significantly different depending on the corrosion scale structure and water source conditions. Thick corrosion scales and hard shell of tubercles had much higher WG ratio (>1.0), while the thin corrosion scales had no magnetite detected or with much lower WG ratio. The WG ratio could be used to identify the characteristics and evaluate the performances of corrosion scales formed under different water conditions. Compared with the pipes transporting ground water, the pipes transporting surface water were more seriously corroded and could be in a relatively more active corrosion status all the time, which was implicated by relatively higher siderite, green rust and total iron contents in their corrosion scales. Higher content of unstable ferric components such as gamma-FeOOH, beta-FeOOH and amorphous iron oxide existed in corrosion scales of pipes receiving groundwater which was less corroded. Corrosion scales on groundwater pipes with low magnetite content had higher surface area and thus possibly higher sorption capacity. The primary trace inorganic elements in corrosion products were Br and heavy metals. Corrosion products obtained from pipes transporting groundwater had higher levels of Br, Ti, Ba, Cu, Sr, V, Cr, La, Pb and As. (C) 2012 Elsevier Ltd. All rights reserved.

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