Utilization of Greater Yam (Dioscorea alata L) as a Raw Material for The Manufactured of Bioethanol With Fermentation by Sacharomyces Ceraviceae

Abstract

Bioethanol is ethanol that made by biomass containing with sugar components, starch, or cellulose. Bioethanol is usually used to an ingridient for making liquor, for medical purposes, as a solvent, and that are popular today is the use of bioethanol as an altenative fuel. The use of bioethanol as a fuel mixed with gasoline is called gasohol. Greater yam (Dioscorea alata L.) is a plant that produces bulbs, annuals and vines alive. Having a high carbohydrate source which is about 27.06 grams per 100 grams of material. Bulbs Greater yam contain enough carbohydrates Basar so that it can be used as a base for the manufacture of bioethanol. Making bioethanol with the basic ingredients of this Greater yam through three stages of the process ie the process of hydrolysis, fermentation and distillation. Hydrolysis process takes place in acidic conditions and with heating due to break down starch into glucose. The process of fermentation convert glucose into ethanol with the aid of bacteria contained in cereviceae Saccharomyces yeast bread. The process of distillation is a purification process to increase the levels of ethanol produced in fermentation processes. The reactor consists of a series of bioethanol fermentation tanks and distillation equipment that includes a series of tanks or tank distilator heating and condenser. In this study that the manufacture of bioethanol produced from a variable tuber uwi with the addition of yeast 7%, 8%, 9%, 10%, and 11% obtained the highest alcohol content of bioethanol with 51% of the four variables with the addition of yeast and obtained 10% bioethanol with The lowest alcohol content is 32% ie at the fifth variable with 10% addition of yeast.