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Mhd Riza Marjoni Pengarang Akmal D Pengarang Friardi Ismed Pengarang

Rice straw is one of the very abundant agricultural waste in Indonesia. The content of cellulose and vhemicellulose are high on the straw can be used as feedstock for bioethanol production through fermentation with the help of yeast. This study uses two types of yeast is Saccharomyces cerevisiae and Rhizopus sp. which has the ability to change the straw hydrolyzate containing cellulose into ethanol through fermentation. The research was conducted by fermenting rice straw hydrolyzate pretreatment results with both the yeast at the same concentration. The purpose of this study was to obtain a pretreatment, the type and concentration of the best yeast to produce bioethanol. Variables examined included pretreatment time (1 hour, 2 hours and 3 hours), the type of yeast (S and R), and the concentration of yeast (3%, 5% and 10%). The parameters observed as a performance indicator production process is the change in pH during fermentation, biomass and ethanol produced after 72 hours of fermentation. The results showed that the highest biomass produced was 0.81 g with 7.74% ethanol using Saccharomyces cerevisiae. The best pretreatment time obtained after 2 hours of pretreatment with the concentration of 5% yeast Saccharomyces cerevisiae.