Abstract
Both municipal wastewater treatment facilities at the City of Windsor, Canada, were studied for variations of heavy metals. Significant hourly variations in Cu, Cr, Cd, Ni, Pb and Zn were observed. Both plants had suspended metal removal efficiencies approaching 75 %, but removal of dissolved metals was insignificant. Occasionally, the effluent metal concentrations exceeded the influent metal concentrations. The heavy metal concentrations in the sludge met the Ontario Ministry of Agricultural guidelines for land application.
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