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Abstract
Cadmium, chromium, copper, nickel, and zinc concentrations at various stages of the Regina Wastewater Treatment Plant were determined. 24‐h composite samples of the wastewater were analyzed by flame atomic absorption spectroscopy and the metal removal efficiency of each stage of the treatment plant was estimated. This one‐week study showed that the primary sedimentation tanks had the highest removal efficiency for chromium, copper, and nickel, and that the aerated lagoons were more effective in removing zinc and cadmium. The treatment plant achieved removal efficiencies of 97% Cd, 87% Cu, 85% Zn, 84% Cr, and 73% Ni.