Abstract
The interactions between metal ions and the polymers which form the matrix of activated sludge are important for two reasons. The ability of the sludge to adsorb metals serves to remove them from waste water and the adsorbed ions then appear to enhance the floc structure. This work examines the adsorption of Pb.Cr and Zn by activated sludge samples and re‐affirms the importance of hydroxyl groups in the binding of most metal ions.

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