Cement-mortar lining failure and metal release caused by electrochemical corrosion of ductile iron pipes in drinking water distribution systems

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Hao Guo , Rui Wang , Menghan Jiang , Yimei Tian , Yapeng Jin , Weigao Zhao , Chenwan Wang , Jianhua Yin
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Abstract

The electrochemical corrosion of ductile pipes (DPs) in drinking water distribution systems (DWDS) has a crucial impact on cement-mortar lining (CML) failure and metal release, potentially leading to drinking water quality deterioration and posing a risk to public health. An in-situ scanning vibrating electrode technique (SVET) with micron-scale resolution, microscopic scale detection and water quality analysis were used to investigate the corrosion behavior and metal release from DPs throughout the whole CML failure process. Metal pollutants release occurred at three different stages of CML failure process, and there are potential risks of water quality deterioration exceeding the maximum allowable levels set by national standards in the partial failure stage and lining peeling stage. Furthermore, the effects of water chemistry (Cl, SO42−, NO3, and Ca2+) on corrosion scale growth and iron release activity, were investigated during the CML partial failure stage. Results showed that the CML failure process in DPs was accelerated by the autocatalysis of localized corrosion. Cl was found to damage the uncorroded metal surface, while SO42− mainly dissolved the corrosion scale surface, increasing iron release. Both the oxidation of NO3 and selective sedimentation of Ca2+ were found to enhance the stability of corrosion scales and inhibit iron release.

饮用水输配系统中球墨铸铁管的电化学腐蚀导致水泥砂浆内衬失效和金属释放
饮用水输配系统(DWDS)中球墨铸铁管(DPs)的电化学腐蚀对水泥-砂浆衬里(CML)的失效和金属释放有着至关重要的影响,有可能导致饮用水水质恶化并对公众健康构成威胁。研究人员利用具有微米级分辨率的原位扫描振动电极技术(SVET)、微观尺度检测和水质分析技术,研究了整个 CML 失效过程中 DPs 的腐蚀行为和金属释放情况。金属污染物的释放发生在 CML 失效过程的三个不同阶段,在部分失效阶段和内衬剥落阶段存在水质恶化的潜在风险,水质恶化程度超过国家标准规定的最大允许水平。此外,还研究了在 CML 部分失效阶段,水化学(Cl-、SO42-、NO3- 和 Ca2+)对腐蚀垢生长和铁释放活性的影响。结果表明,局部腐蚀的自催化作用加速了 DP 的 CML 失效过程。研究发现,Cl- 会破坏未腐蚀的金属表面,而 SO42- 则主要溶解腐蚀垢表面,增加铁的释放。研究发现,NO3- 的氧化作用和 Ca2+ 的选择性沉降作用都能增强腐蚀鳞片的稳定性并抑制铁的释放。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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