VALORIZATION OF COFFEE HUSK TO BIOETHANOL BY USING SEPARET HYDROLYSIS AND FERMENTATION METHODE

Abstract

Coffee husk considers as one of the agricultural waste lignocellulose biomass that contain high amount of cellulose In Ethiopia 192,000 metric tons of coffee is husk cast adrift as by product per year. Thus, in compliance with the concept of suitable for development, innovative techniques and products for the profitable and adequate use of this type residue are being sought. Several research works presenting proposals for such endeavors have been published in the literature and reviewed here in. Furthermore, the aim of this work is valorization of coffee husks to bioethanol by using separate hydrolysis and fermentation methods, which is critically used as replacements for renewable sources of energy and to minimize environmental pollutions too. This method was accomplished by four major experimental procedures, which were pretreatment, hydrolysis, fermentation and distillation processes. There were two parameters and 6 lab experiments exposed in the laboratory work depending on the H2SO4 concentration and size difference in the hydrolysis step. The effect of these parameters was analyzed using Microsoft Excel. The results showed that the content of sugars increased as the acid (H2SO4) concentration increased from 1% - 3 % and decreased as the acid concentrations increased from 3 % up to 5 %. At the optimal acid concentration (3%, H2SO4), the sugar yield obtained was 50.18% from the coffee husk. This sample was further investigated to produce bioethanol and the ethanol yield from this experiment was 68.28 %. The product is clear and colorless liquid. The yield of each experiment is calculate and characterize by pH Value, physical and chemical properties. Then, higher efficiency was selected. Based on this, the economically feasible bioethanol plant with annual producing of 5,000,000liters per year was estimated and its site location is Jimma area due to availability of raw material and other some facilities.