COMPARATIVE ANALYSIS AND OPTIMIZATION OF BIOETHANOL PRODUCED FROM ORANGE AND GRAPE PEELS

Authors: Nosakhare F, *Osemwengie S.O, Oiwoh O

DOI Info: N/A

ABSTRACT

This study was aimed at carrying out a comparative analysis on the amount of bioethanol produced from orange and grape peels. The samples were collected, dried, grinded and sieved to obtain particle size not reater than 0.6mm. The sieved samples were acid-hydrolyzed and fermented to produce ethanol. Design of experiment and Response Surface Method (RSM) was used to randomize the independent variable to obtain different runs conditions of acid concentration (0.5 to 1.0%v/v), and hydrolysis time (5 to 25 minutes). A total of 13 runs were carried out for orange peels and grape peels at the same conditions for both samples. At the end of experiment the quadratic model gave R-Values of (0.998 and 0.974) for orange and grape peels respectively. It was observed that optimum condition for producing ethanol was at acid concentration of 0.75%v/v and hydrolysis time of 15 minutes keeping pH and hydrolysis temperature constant at 4.5 and 120 ^oC respectively and the optimum amount of bioethanol obtained at these conditions were 17 wt. % and 15 wt. % for orange and grape peels respectively. There was 6.25% more bioethanol produced at optimum conditions from orange peels than grape.

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