OPTIMIZING ETHANOL CONCENTRATION FROM ORANGE PEEL WASTES USING RESPONSE SURFACE METHODOLOGY
Authors: *Akhabue, C.E, Osarumwense J.O, Ekhator O.H, Oyekunle D.T, Oyedoh E.A
This study was aimed at optimizing the concentration of bioethanol produced from orange peel using Response Surface Methodology (RSM). Ground orange peels were hydrolyzed using dilute sulphuric acid and Saccharomyces cerevisiae was used in the fermentation process. Central Composite Design (CCD) was used to analyze the effects of four variables, acid concentration (0.5 -1 v/v %), hydrolysis time (5 – 25 min), hydrolysis temperature (100 - 140oC) and pH (3 - 6) on the amount of ethanol produced from the fermented mixture. A total of 30 experimental runs which were generated by the CCD were carried out. Acid concentration, hydrolysis temperature and pH were significant factors affecting the concentration of ethanol. The quadratic model that described relationship between ethanol concentration and the variables had a coefficient of determination (R2) of 0.976. The optimum conditions for the optimization process was found to be acid concentration of 0.743 v/v, hydrolysis time of 16.41 min, temperature of 116.54 oC and pH of 5.25 to give an ethanol concentration of 30.15%.
Affiliations: *Department of Chemical Engineering, Faculty of Engineering, University of Benin, PMB 1154, Benin City, Nigeria
Keywords: Orange Peels, Bioethanol, Optimization, Hydrolysis, Response Surface Methodology
Published date: 2018/06/30