Published Paper Details:

Bioethanol is a global issue on the effort to be reduced global pollution, contributed significantly by the petroleum or diesel combustion or combination of both. With the help of developing technology and promising researches, the Ginger and the Pineapple peels are utilized as biomass to bioethanol production due to its substantial amount of carbohydrates that can be converted into fermentable sugar. In this study, the effect of fermentation pH was investigated. The concentration of yeasts was first standardized. After standardization, the Ginger and the Pineapple peels were subjected to a dilute-acid pre-treatment using 2.5% (v/v) sulphuric acid for 2 hours at 90? yielding 0.4% (w/v) reducing sugar. The resulting solutions after hydrolysis are then subjected to fermentation at different pH readings. Values of pH from 4.0 to 6.0 with an increment of 0.25 are used in the investigation of pH. The adjustment of pH was done with 1.0 M Sodium hydroxide solution and pretreated substrate used. The fermentation broth subjected to pH 5.5 gave the maximum ethanol concentration of 8.6% (Ginger) and 8.8% (Pineapple). The optimization method discussed in the present study leading to be relatively high bioethanol production could provide a promising way for production with cellulose content.