KINERJA MIKROBA Zymomonas mobilis DAN Saccharomyces cerevisiae UNTUK MENGURAIKAN HIDROLISAT TONGKOL JAGUNG MENJADI BIOETANOL DENGAN PENGARUH WAKTU FERMENTASI DAN RASIO PENAMBAHAN MIKROBA

Abstract

Bioethanol from biomass is one of energy which  has a  potential as  alternative fuel. Bioethanol can be produced by using fungi or bacteria. The research was about  the performance of Zymomonas mobilis and Saccharomyces cerevisiae to change corn cobs hydrolyzate into bioethanol by adding microbes to the influence of time and ratio of  fermentation had been done. The hydrolyzate  were decomposition of corn cobs using Trichoderma reesei and Aspergillus niger. The purpose of this study was to know the conversion of  hydrolysis of corn cobs into bioethanol with variation time of fermentation (1 day, 3 days, 5 days, and 7 days) and rate of adding microbes  (Zymomonas mobilis : Saccharomyces cerevisiae = 1:1; 1:2 and 2:1) (v/v). The glucose from corn cobs hydrolyzate was 5,869 g/ml. Fermentation wass carried out at 25 ⁰C. Bioethanol which obtained from this study was investigated using gas chromatography. The optimum bioethanol yield was equal to 6,31% by using Zymomonas mobilis : Saccharomyces cerevisiae (2:1) and at the 3 days  fermentation time.