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More and more utilities are using chloramines in place of free chlorine because of their greaterstability for better compliance with both the Total Coliform Rule and more stringentrequirements of the Disinfectants/Disinfection Byproducts Rule. New information aboutdisinfectant-induced changes in oxidation reduction potential (ORP), lead chemistry, scaleformation and interactions with natural organic matter have contributed to greater understandingof the factors influencing increased corrosion and metals release associated with a change indisinfectant. This paper provides a brief overview of Pb(IV) theoretical considerations as appliedto metals release in the distribution system. In addition, this paper provides preliminary data andinformation based on ongoing laboratory and field studies aimed at understanding the impact of achange in disinfectant on lead, brass, and copper components in the distribution system. Resultsfrom this study will be of interest to utilities that are considering converting from free chlorine tochloramines, and/or utilities concerned with maintaining simultaneous compliance with the Leadand Copper Rule and the Stage 2 D/DBPR. Includes 29 references, figures.

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Edition: Vol. - No. Published: 06/01/2007 Number of Pages: 40File Size: 1 file , 2 MB