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SOLVING A COPPER CORROSION PROBLEM WITH ORTHOPHOSPHATE: INDIAN HILL, OHIO CASE STUDY
Citation:
Schock*, M R. AND J. C. Fox. SOLVING A COPPER CORROSION PROBLEM WITH ORTHOPHOSPHATE: INDIAN HILL, OHIO CASE STUDY. Presented at Ohio AWWA Annual Conference, Cleveland, OH, 8/26-29/2001.
Description:
Many small and medium-sized water systems have troublt complying with the copper Action Level (of the Lead and Copper Rule), sometimes concurrently with meeting the lead Action level. The problem is especially troubling and widespread with ground water supplies having high alkalinities as in the Midwest. Orthophosphate and blended phosphates have been used by many of these systems, but success hs not been consistent. Different utilities frequently receive many conflicting suggestions about courses of treatment for this problem. Indian Hill Water Works (IHWW) suppies water to several suburban communities to the east of Cincinnati, OH. Lead and Copper Rule sampling in 1992 uncovered high copper levels in many homes in this system. After analyzing and modeling copper chemistry for the normal finished water quality and some different treatment scenarios, four copper pipe loops were st up in a recirculation mode to study worst-case cuprosolvency conditions for four hypothetical teratments. Details of the experiments will be given.