EQUILIBRIUM AND THERMODYNAMIC STUDIES ON TREATMENT OF REFINERY WASTE WATER USING MODIFIED ACTIVATED SLUDGEAMAL AL-SADI, N. RAJAMOHAN AND K.P. RAMACHANDRANAbstract Experiments were carried out to evaluate the equilibrium and thermodynamic behaviour of the batch adsorption system involving the use of modified activated sludge for the treatment of refinery waste water. The equilibrium data were determined for the sorption system and fitted with three equilibrium isotherm models, namely Langmuir, Freundlich and Dubinin-Radushkevich models. Langmuir isotherm fitted well with the equilibrium data with high values of correlation coefficient and the maximum COD uptake capacity was determined from the linear plot as 147.06 mg/g at an operating temperature of 30° C. The thermodynamic studies were conducted to evaluate the Gibbs free energy and the negative values observed in this study confirmed the spontaneous nature of sorption. The enthalpy change was determined as -18.012 kJ/mol indicating the exothermic nature of the process.
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