Bacterial biomass was produced by culturing poly-saccharide-producing Bacillus circulans in liquid medium containing glucose as carbon source. The biomass thus obtained was used to remove copper and cadmium ions from aqueous solutions. A biomass concentration of 1.48-1.52 g dry weight/l was found to remove 80% of copper and 44% of cadmium from solutions containing 495 ppm copper and 492 ppm cadmium, respectively. The pH of the metal solutions was found to have a pronounced effect on the metal-accumulating capacity of the organism. The removal of copper and cadmium ions from metal solutions by this bacterium was very efficient at low concentration ranges.
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