Copper Corrosion in Potable Water Systems: Impacts of Natural Organic Matter and Water Treatment Processes

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Abstract
Copper corrosion was examined in the presence of natural organic matter (NOM) and in situations where NOM was altered by drinking water treatment. Corrosion rates (icorr) increased with higher NOM concentration at pH 6, whereas insignificant effects where observed at pH 7.5 and 9.0. Corrosion byproduct release was affected adversely by 4 mg/L NOM at pH 6.0, 7.5 and 9.0, with soluble copper increasing by 0.6 mg/L to 0.7 mg/L when compared to solutions without NOM. Alum-coagulated waters had higher icorr than untreated waters, but ferric chloride (FeCl3·6H2O)-coagulated waters exhibited reduced icorr. This difference was attributed to the relative effects of added sulfate (SO42−) via alum coagulation vs added chloride (Cl−) via FeCl3·6H2O coagulation. The effect of combined treatment (alum coagulation, ozonation, and granular activated carbon [GAC]) was similar to that using alum coagulation alone.

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