Volume No. 7 Issue No.: 3 Page No.: 1193-1200 Jan. - Mar.2013

 

EFFECTIVE UTILIZATION OF YEAST SLUDGE IN DECOLOURIZATION OF MELANOIDIN PIGMENT MODELLING, BIOKINETIC AND THERMODYNAMIC STUDIES

 

Ravikumar R.,* Sridhar A., Preethi S., Rasika Gopalakrishnan and Vasanthi N.S.

Department of Biotechnology, Bannari Amman Institute of Technology, Sathyamangalam, Erode, Tamil Nadu (INDIA)

 

Received on : August 21, 2012

 

ABSTRACT

 

Ethanol production from sugarcane molasses yields large volumes of highly colored spent wash as effluent. The decolourization of melanoidin pigment prepared synthetically has been carried out using biosorbent which was prepared from a mixture of yeast sludge (solid waste from distillery) and Trichoderma viridi in the ratio 4:1. The isotherm studies were performed and Langmuir Isotherm was found to be fit. Results from Kinetic studies showed that the process follows the Pseudo second order model. The standard free energy change, enthalpy change and entropy change were calculated to evaluate the thermodynamic feasibility and the spontaneous nature of the adsorption process. The estimated enthalpy change (ΔH) and entropy change (ΔS) of adsorption were 38.195 kJ/mol and 143.474 J/mol K respectively. Thermodynamic studies revealed that the process to be Physical adsorption, endothermic in nature. The maximum decolourization of 68.07% was obtained at pH 7.5, Melanoidin concentration of 32.5 mg/L with 1.63 g/100mL of adsorbent for 2.75 hr.

 

Keywords : Melanoidin pigment, Decolourization, Yeast sludge, Biosorption, Disrillery spent wash, Pseudo second order model

 

 

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