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|Title:||Impact of elevated Ca2+/Mg2+ concentrations of reverse osmosis membrane desalinated seawater on the stability of water pipe materials||Authors:||Liang, J.
Water distribution pipeline
|Issue Date:||2014||Citation:||Liang, J., Deng, A., Xie, R., Gomez, M., Hu, J., Zhang, J., Ong, C.N., Adin, A. (2014). Impact of elevated Ca2+/Mg2+ concentrations of reverse osmosis membrane desalinated seawater on the stability of water pipe materials. Journal of Water and Health 12 (1) : 24-33. ScholarBank@NUS Repository. https://doi.org/10.2166/wh.2013.060||Abstract:||Hardness and alkalinity are known factors influencing the chemical stability of desalinated water. This study was carried out to investigate the effect of Ca2+ and Mg2+ on corrosion and/or scale formation on the surface of different water distribution pipe materials under tropical conditions. The corrosion rates of ductile iron, cast iron and cement-lined ductile iron coupons were examined in reverse osmosis (RO) membrane desalinated seawater which was remineralised using different concentrations of Ca2+ and Mg2+. The changes in water characteristics and the coupon corrosion rates were studied before and after the post-treatment. The corrosion mechanisms and corrosion products were examined using scanning electron microscope and X-ray diffraction, respectively. We found that the combination of Ca2+ and Mg2+ (60/40 mg/L as CaCO 3) resulted in lower corrosion rates than all other treatments for the three types of pipe materials, suggesting that Ca2+/Mg 2+ combination improves the chemical stability of desalinated seawater rather than Ca2+ only. © IWA Publishing 2014.||Source Title:||Journal of Water and Health||URI:||http://scholarbank.nus.edu.sg/handle/10635/91006||ISSN:||14778920||DOI:||10.2166/wh.2013.060|
|Appears in Collections:||Staff Publications|
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