Abstract:
This thesis dealt with the studies of ethanol production from food waste. The studies divided intothree parts 1) Saccharification of food waste using heat, diluted acid and amylase enzyme2) Fermentation of fermentable sugar from appropriate saccharification process usingSaccharomyces cerevisiae and 3) Ethanol production from food waste using Lok Pang (typical dryinoculums). The result from the first experiment reveal that the highest saccharification of foodwaste with diluted sulfuric acid (0.3M) at the ratio of 6:10 with temperature of 100 degree Celsius,80 minute, yielded 58.39 percent saccharification. Fermentation of Saccharomyces cerevisiae using8 percent of saccharified sugar from diluted acid gave the ethanol yield of 37.03 g/l (4.69 percent byvolume) at 72 hours of fermentation. Yp/s was 0.48 and productivity of 0.51 g/l/hr, conversionprocess was 14.57 percent by dry weight. The high amount of acid formation from this experimentwere in sequence of butyric acid, acetic acid and propionic acid. The study of ethanol fermentationby Lok Pang found that at 127 g of food waste, the productivity of 0.05, 0.01, and 0.15 percent ofLok Pang shown no significant different. Hence the inoculums size of 0.05 percent was the mostappropriate one. The highest amount of acid found in Lok Pang fermentation were acetic acid,