A STUDY ON THE REMOVAL CHARACTERISTICS OF COPPER AND CADMIUM FROM AQUEOUS SOLUTION BY SLUDGEAHMAD ASHFAQ, I.H. FAROOQUI AND ABDUL MALIKAbstract The equilibrium and kinetics has been studied for the removal of Cu(II) and Cd(II) ions from dilute aqueous solution onto the activated sludge, generated from the brewery plant. The parameters such as pH, equilibrium time, effect of initial metal concentration, effect of biosorbent dosages were studied. Initial metal concentrations varied from 10 to 100 mg/L. An initial pH of 5.0 and 5.5 were found most favourable for the Cu(II) and Cd(II) removal. The optimum biosorption conditions for temperature and biomass concentration has been found at 25oC and 1.0 mg/L respectively. Two theoretical isotherm models namely Langmuir and Freundlich, were analysed for the applicability of the experimental data. The maximum biosrption capacity for Cu(II) and Cd(II) ions were obtained as 37.68 mg and 46.58 mg per g of the biosorbent applied. It was also found that biosorption of heavy metals ions followed second-order kinetics. The equilibrium adsorbed amount also increased with the initial concentration of the metal ions.
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