Title

Optimizing Source Water Blends For Corrosion And Residual Control In Distribution Systems

Abstract

Utilities that blend different source waters need to understand the water quality issues that arise from doing so. The experience of a Tucson, Ariz., utility in 1992 showed that introducing new sources into old distribution systems can cause unacceptable water quality at the customer's tap. In this article the authors describe a technique developed to assist utilities in determining blends for simultaneous control of lead, copper, iron, and monochloramine concentrations. Three source waters -groundwater, surface water, and desalinated water -were evaluated in a pilot distribution system constructed of polyvinyl chloride, unlined-iron, lined - iron, and galvanized-iron pipes from an existing utility distribution site. The study results indicate that different pipe materials often have conflicting water quality requirements for release abatement. For example, increasing Alkalinity increased corrosion of copper and lead pipes but was beneficial in reducing release of iron corrosion products from the pipes. Increasing sulfates reduced the release of lead but increased the release of iron. Because of these conflicting water quality requirements, utilities must carefully evaluate the tradeoffs between water quality and corrosion response to optimize source water blends for their systems.

Publication Date

1-1-2006

Publication Title

Journal / American Water Works Association

Volume

98

Issue

5

Number of Pages

-

Document Type

Review

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/j.1551-8833.2006.tb07664.x

Socpus ID

33745320547 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33745320547

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