Effects of chloride on corrosion scale compositions and heavy metal release in drinking water distribution systems,Journal of Hazardous Materials

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Effects of chloride on corrosion scale compositions and heavy metal release in drinking water distribution systems
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-01-05 , DOI: 10.1016/j.jhazmat.2024.133452
Hui Zhang ₁ , Shan Zhang ₁ , Yuekai Liu ₂ , Min Yang ₃ , Xue Zhou ₄ , Ghulam Abbas ₅ , Long Wang ₁ , Jinsuo Lu ₁

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Variations in water chemistry may lead to the release of harmful heavy metals in drinking water distribution systems (DWDSs). In this study, the effects of chloride on the release of heavy metals such as Fe, Mn, As, Cr, Mo, V, Sr, and Co were examined using steel and cast iron pipe loops. After chloride was added, the relative contents of goethite (α-FeOOH), lepidocrocite (γ-FeOOH), and siderite (FeCO) in pipe scales increased, but the contents of magnetite (FeO) decreased. The most prevalent compounds were α-FeOOH and γ-FeOOH. When the chloride levels were increased, the effluent concentrations of Fe, Mn, As, Cr, Mo, V, Sr, and Co significantly increased. These heavy metals were released presumably because of the destabilization and dissolution of corrosion scales induced by chloride and adsorption site competition. Strong positive correlations were also observed between Fe&Mn, Fe/Mn&As, Fe/Mn&Cr, Fe/Mn&Mo, Fe/Mn&V, Fe/Mn&Sr, and Fe/Mn&Co, indicating the co-release of Fe, Mn, and other metals. This study may be helpful for the potential strategies on avoidance of heavy metal release and improvement of water supply security.

中文翻译：

氯化物对饮用水分配系统中腐蚀垢成分和重金属释放的影响

水化学的变化可能导致饮用水分配系统 (DWDS) 中有害重金属的释放。在本研究中，使用钢和铸铁管道回路检查了氯化物对 Fe、Mn、As、Cr、Mo、V、Sr 和 Co 等重金属释放的影响。添加氯化物后，管垢中针铁矿（α-FeOOH）、纤铁矿（γ-FeOOH）和菱铁矿（FeCO）的相对含量增加，而磁铁矿（FeO）的含量下降。最常见的化合物是 α-FeOOH 和 γ-FeOOH。当氯化物含量增加时，废水中铁、锰、砷、铬、钼、钒、锶和钴的浓度显着增加。这些重金属的释放可能是由于氯化物和吸附位点竞争引起的腐蚀垢的不稳定和溶解。 Fe&Mn、Fe/Mn&As、Fe/Mn&Cr、Fe/Mn&Mo、Fe/Mn&V、Fe/Mn&Sr 和 Fe/Mn&Co 之间也观察到强正相关，表明 Fe、Mn 和其他金属的共释放。这项研究可能有助于避免重金属释放和改善供水安全的潜在策略。

更新日期：2024-01-05

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