Review on corrosion and corrosion scale formation upon unlined cast iron pipes in drinking water distribution systems

Chao Chen , Haiya Zhang , Dibo Liu , Lvtong Zhao , Jun Wang , Shuguang Xie , Shuming Liu , Pengfei Lin , Xiaojian Zhang , Carsten Prasse , Xin Yang , Bin Xu , Xing-Fang Li


Received January 24, 2022,Revised , Accepted April 21, 2022, Available online May 02, 2022

Volume 34,2022,Pages 173-189

The qualified finished water from water treatment plants (WTPs) may become discolored and deteriorated during transportation in drinking water distribution systems (DWDSs), which affected tap water quality seriously. This water stability problem often occurs due to pipe corrosion and the destabilization of corrosion scales. This paper provides a comprehensive review of pipe corrosion in DWDSs, including corrosion process, corrosion scale formation, influencing factors and monitoring technologies utilized in DWDSs. In terms of corrosion process, corrosion occurrence, development mechanisms, currently applied assays, and indices used to determine the corrosion possibility are summarized, as well as the chemical and bacterial influences. In terms of scale formation, explanations for the nature of corrosion and scale formation mechanisms are discussed and its typical multilayered structure is illustrated. Furthermore, the influences of water quality and microbial activity on scale transformation are comprehensively discussed. Corrosion-related bacteria at the genus level and their associated corrosion mechanism are also summarized. This review helps deepen the current understanding of pipe corrosion and scale formation in DWDSs, providing guidance for water supply utilities to ensure effective measures to maintain water quality stability and guarantee drinking water safety.

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