Abstract
Abstract This paper reports the results obtained on Cu2+ and Cr3+ uptake by activated sludge of 7 and 12 d sludge age. Removal efficiencies of these heavy metals decrease when their initial concentrations increase. For the Cu2+, sludges of lower age adsorb 12% less over the range of the metal concentration added. The Cr3+ adsorption was a function of both sludge age and initial concentration. For an initial concentration of 32 mg/L, both sludges gave identical removals. The stability of bound, metal-activated sludge increases when the sludge age increases for Cu2+. The opposite effect has been noted with Cr3+.
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