Utilization of corncob waste as bioethanol raw material by activities of Dekkera Bruxellensis and Saccharomyces Cerevisiae

Abstract Corncob waste is not managed properly has the potential to environmental pollution. The purpose of this reasearch utilize corncob as a biomass into bioethanol. Process making bioethanol carried out in 4 steps, namely delignification, hydrolysis, fermentation, distillation. substrate were prepared mechanically become size powder 40 mesh. Delignification by fungi Dekkera Bruxellensis was varied with ratio 5, 10, and 15 grams at contact times 3, 7 days. Hydrolysis 2% sulfuric acid (H 2 SO ) 30, 45, 60 minutes. Glucose concentration measured uing 5-dinitrosalicylate (DBS) method. Variations fungi:ragi = 1:1 Distillation temperature 78°C using Gas Chromatography–Mass Spectrophotometry (GC-MS). This result optimum delignification variation 5 time days, lignin removal 20,72%. glucose hydrolysis produced 7,561 g/L Sulfuric ). highest ethanol content 2,95% occured fungi:yeast during Based on pilot scale calculation diameter 1,9 m height 0,9 m, then for 100 kg corncobs can be produce 4,133L total ethanol.