The objective of the present study was to assess the effects of the ozonation and biofiltration processes on Cu corrosion in water from the Lake Manatee (Florida) and Lake Bluff (Illinois) water utilities. The biodegradable dissolved organic carbon (BDOC) and UV absorbance at 254 nm (UV254)/total organic carbon (TOC) ratio are two important parameters that were found to impact the corrosion rates significantly. The rate of leaching was found to decrease with increasing BDOC content, while waters with a high UV254/TOC ratio were generally more aggressive. A decrease in the BDOC/dissolved organic carbon (DOC) ratio was found to favor particulate Cu formation. The results also indicate that besides the BDOC/DOC ratio, the natural organic matter (NOM) source and its characteristics also influence particulate Cu formation, in support of earlier research. A 10-week exposure experiment indicated that the ozonated/biofiltered water samples could be much more aggressive than the corresponding synthetic water samples during the initial four weeks.

Subject
Water, Correlation, Organic carbon, Corrosion rate, Solubility, Dosages, Leaching, Acidity, Particulates, Water quality, Copper, Risk reduction, Chlorides
Keywords:
biodegradable dissolved organic carbon, biofiltration, copper, corrosion rate, environmentally assisted corrosion, natural organic matter, ozonation, potentiodynamic
NACE International
2003
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