Bioenergy Production from Straw by Anaerobic Fermentation

• Main Authors: Chien-yu Lin, 林茜羽
• Other Authors: Ciou-yu Lin
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/36274295799075633156

碩士 === 逢甲大學 === 環境工程與科學所 === 96 === Traditional fuel material such as oil, coal, natural gas and nuclear energy may gradually be replaced by renewable energy and bioenergy. Cellulose is the major component in agriculture and forestry wastes, and the major ingredients of waste paper produced from municipal waste. In Taiwan, the production of straw is about 2.35 million metric ton every year, which is a very suitable source of cellulose for bioenergy production. Using straw as the substrate and 11 kinds of seed sludge, heat treatment of seed sludge, temperature, pH, grain size and initial straw concentration were investigated the effects on bioenergy production. The results reveal that the seed sludge obtained from Jhong-Sing Village had higher hydrogen production （12.8 mL）at 55℃ after heat treatment. Initial cultivation pH ranges was 3.5~8; the optimal pH for hydrogen production was 6.5, with production of 13.4mL. Grain size less than 0.297mm prouduced, much more hydrogen （11.4mL）. The range of straw concentration tested was 30~120 g straw/L, and 90 g straw/ L had peak H2 Yield （77.2 ml/g TVS, 0.77 mmol/g cellulose）. Adding surface-active agent could not help hydrogen production, but it reduced the reaction time by 50%. The anabolic pathway shifted from acetic acid to ethanol fermentation. In addition, fed-batch could not elevate H2 Yield, but inhibit hydrogen production. Three species of bacteria were observed: Clostridium Pasteuianum, Thermoanaerobacterium Thermoanaerobacterium and Clostridium stercorarium. Clostridium stercorarium has the ability of decomposing cellulose and then producing hydrogen. These three bacteria are suitable living at high temperature environment, and were dominant in straw ferment liquid.