Degradation of Drinking Water Treatment Plant Infrastructure from Enhanced Coagulation
Publication: Journal of Infrastructure Systems
Volume 9, Issue 4
Abstract
The new Enhanced Coagulation Rule requires that drinking water utilities improve the removal of natural organic matter from their water. One common method of doing so is to “enhance” the performance of existing coagulation processes by increasing the coagulant dose, changing the coagulant type, or lowering the coagulation pH. There is growing concern that these treatment changes might cause degradation of cement and metallic components of drinking water treatment plant infrastructure. In a survey of enhanced coagulation impacts at 275 water utilities, 24% have reportedly already seen at least some infrastructure degradation. A comprehensive literature review highlights the potential causes for the degradation observed by utilities, and recommendations are provided to guide utilities seeking to minimize degradation and repair existing damage.
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Journal of Infrastructure Systems
Volume 9 • Issue 4 • December 2003
Pages: 145 - 156
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Copyright © 2003 American Society of Civil Engineers.
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Received: Oct 22, 2002
Accepted: May 20, 2003
Published online: Nov 14, 2003
Published in print: Dec 2003
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