PEMBUATAN BIOETANOL DARI AMPAS TAHU DENGAN METODE HIDROLISIS ASAM DAN FERMENTASI DENGAN MENGGUNAKAN RAGI INSTAN

Abstract

Abstrak Dewasa ini, kebutuhan energy dunia semakin meningkat sementara persediaan energy dari bahan bakar fosil yang selama ini diandalkan jumlahnya terbatas. Kata kunci: ampas tahu, ragi instan,bioetanol, hidrolisis. Abstract Today, world energy needs are increasing while the supply of energy from fossil fuels that has been relied on is limited. Therefore, an alternative energy source is needed that is able to overcome the energy crisis. One alternative energy source that is being developed is bioethanol. Bioethanol can be produced by fermenting glucose using Saccharomyces cerevisiae yeast. Ethanol production in this study uses tofu waste material. This study aims to obtain the optimum concentration of sulfuric acid in the hydrolysis process and optimum fermentation time in the process of making bioethanol from tofu industry. The results showed that the optimum concentration of sulfuric acid for hydrolyzing tofu waste was at a concentration of 0.5 M for 30 minutes at 121 O C. During fermentation there is a decrease in pH and glucose and an increase in ethanol production. The optimum ethanol production occurs at 5 days fermentation time with 4.77% ethanol concentration b/b. Keywords: tofu pulp, instant yeast, bioethanol, hydrolysis.