Abstract
The biosorption of four metal ions, cadmium, copper, nickel and zinc from multicomponent mixtures in aqueous solution by anaerobically digested sewage sludge is reported. The metal competition study was performed on binary metal systems where the two metals present had the same initial concentration. An increment of the total metal adsorption was obtained in all tests when compared to the single metal systems. The same behaviour was observed when a mixture of all the four metal ions was studied. The metal-sludge affinity order found was the same in single and multi-component (binary and quaternary) mixtures copper, cadmium, zinc and nickel. Copper has been demonstrated to have the capacity to desorpt cadmium and zinc previously bound to the sludge.
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