Evaluation of Stability Constants in the Association Between Activated Sludge and Cu(II), Zn(II), and Cr(III) Ions

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Abstract
Adsorption kinetics and adsorption isotherms of Cu(II), Zn(II), and Cr(III) on activated sludge were evaluated in the 0–2 ppm concentration range. The experiments were performed at 0 and 0.1 M NaCl ionic strength at pH 5 and 20°C. From the adsorption data the apparent constants for metal-sludge association were evaluated by a standard model. A modification of the treatment allows the determination of true stability constants comparable to those for the association of heavy metals with polypeptides. Adsorption sites are present on greasy particles dispersed at the surface of biomasses.

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