KINETIC AND EQUILIBRIUM MODELLING OF NICKEL(II), FROM AQUEOUS SOLUTION THROUGH BIOSORPTION USING ACTIVATED SLUDGEAhmad AshfaqAbstract This paper analyses the possibilities of the sorption method application for the removal of Ni(II) ions from aqueous solution. The biosorption equilibrium level was determined as a function of pH, contact time, initial heavy metal concentration and biosorbent concentrations. The metal uptake was increased with the increase in initial metal concentration and decreased with biosorbent concentration. The maximum sorption was observed at the pH value 1.0 and was observed that the equilibrium was reached in 90 minutes. The biosorption on the biomass was correlated well (r2 >0.9916) with the Langmuir equation as compared to Freundlich isotherm, under the concentration range studied. The pseudo-first-order and pseudo-second-order kinetic models were applied to test the experimental data and the results were better described using the pseudo-second-order. The maximum sorption capacity was determined to be 29.74 mg/g of biosorbent applied, at optimum conditions. The results showed that dried activated sludge is a suitable option for the removal of Ni(II) ions from aqueous solutions.
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