Characteristics of iron corrosion scales established under blending of ground, surface, and saline waters and their impacts on iron release in the pipe distribution system |
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| Authors: | Zhijian Tang Weizhong Xiao |
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| Affiliation: | a Department of Civil and Environmental Engineering, University of Central Florida, P.O. Box 162450, Orlando, FL 32816, USA
b Department of Civil and Environmental Engineering, Korea University, 1, 5-ka, Anam-dong, Sungbuk-ku, Seoul, 136-701, Republic of Korea |
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| Abstract: | Interior scales on PVC, lined ductile iron (LDI), unlined cast iron (UCI) and galvanized steel (G) were analyzed by XRD, RMS, and XPS after contact with varying water quality for 1 year. FeCO3, α-FeOOH, β-FeOOH, γ-Fe2O3, Fe3O4 were identified as primary UCI corrosion products. No FeCO3 was found on G. The order of Fe release was UCI > G ? LDI > PVC. For UCI, Fe release decreased as % Fe3O4 increased and as % Fe2O3 decreased in scale. Soluble Fe and FeCO3 transformation indicated FeCO3 solid was controlling Fe release. FeCO3 model and pilot data showed Fe increased as alkalinity and pH decreased. |
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| Keywords: | Iron corrosion Water blending XRD RMS XPS Siderite |
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