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AWWA ACE68954

AWWA ACE68954 Facilitated Lead Corrosion by Nitrate in Water Distribution System

Conference Proceeding by American Water Works Association, 11/01/2008

Yang, Bin; Yang, Yanru

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This powerpoint presentation begins by providing a brief overview of disinfection, nitrification, and lead corrosion. Research objectives included the following: evaluate the effect of nitrification products, nitrate and nitrite on lead leaching; and,elucidate the biological mechanisms thatcontribute to lead corrosion. The experimental setup is provided, and presentation conclusions indicate the following: the products of nitrification, particularly nitrate,may cause significant lead corrosion in drinkingwater systems;more importantly, nitrate facilitates lead corrosionby attacking the protective film formed on leadsurfaces in tap water; and,the presence of nitrifying bacteria become directlyinvolved in lead corrosion by providing analternative electron acceptor, for the oxidativedissolution of lead. Includes table, figures.

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