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EFFECTS OF CHANGING DISINFECTANTS ON LEAD AND COPPER RELEASE– A REVIEW
Citation:
BOYD, G. R., K. M. DEWIS, G. V. KORSHIN, S. H. REIBER, M. R. SCHOCK, A. M. SANDVIG, AND R. GIANI. EFFECTS OF CHANGING DISINFECTANTS ON LEAD AND COPPER RELEASE– A REVIEW. ISSN 1551-8833 , JOURNAL OF THE AMERICAN WATER WORKS ASSOCIATION. American Water Works Association, Denver, CO, 100(11):., (2008).
Impact/Purpose:
to share information
Description:
More utilities are using chloramines in place of free chlorine for greater residual stability and better compliance with both the Total Coliform Rule (TCR) and more stringent requirements of the Disinfectants/Disinfection By-Products Rule (D/DBPR). However, new information about disinfectant-induced changes in oxidation reduction potential (ORP), lead and copper chemistry, scale formation, and scale destabilization involving natural organic matter (NOM) has contributed to greater understanding of factors influencing increased corrosion and metals release. This paper consolidates and updates information about potential impacts of a change in disinfectant on lead and copper release in drinking water distribution systems. The findings indicate the importance of chemical properties and electrochemical behavior in understanding how corroding metals and alloys respond to transitions from free chlorine to chloramines, and vice versa.
