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AWWA ACE71003
- Change in Corrosion Control Treatment Due to Need of Reduced Effluent Discharge Zinc Concentrations: A Historical View
- Conference Proceeding by American Water Works Association, 11/01/2009
- Publisher: AWWA
$12.00$24.00
This powerpoint presentation begins by providing a brief overview of Fairfax Water (FW), the largest drinking water utility in Virginia. Historical corrosion control facts are presented, and FW changed to a chemical corrosioncontrol inhibitor (ZnPO<sub>4</sub>) in 1998. Competing regulations including the Safe Drinking Water Act (SDWA) and the Lead and Copper Rule (LCR) vs. the Clean Water Act (CWA) and NPDES caused FW to change their corrosion control inhibitor. The Virginia Department of Health recommended a pipeloop study to determine whether thechange in the corrosion inhibitorchemical would affect Pbconcentrations. The study demonstrated that there was not a difference betweenthe use of ZnPO<sub>4</sub> and H<sub>3</sub>PO<sub>4</sub> as acorrosion control inhibitor in thisapplication. The pros and cons of the switchfrom ZnPO<sub>4</sub> to H<sub>3</sub>PO<sub>4</sub> are listed. Includes figures.
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