Bioenergy Production from Fermentation Residues

• Main Authors: Chih-yu Huang, 黃至宇
• Other Authors: Chiu-yue Lin
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/13921797884911044482

碩士 === 逢甲大學 === 環境工程與科學所 === 98 === The bioenergy technology and processes to produce hydrogen and ethanol from non-food cellulosic biomass is attractive in developing future energy source. Developing of the fermentation technology based on the concept of resource recycling and environmental protection is important. This study used anaerobic fermentation technology and Taguchi experimental design to find the optimal condition for bioenergy production from α-cellulose and vinasse to assess the feasibility of bioenergy production from fermentation residues. Five controllable factors were selected, and there were four levels for each as the following combinations: (A) seed sludge (Chung-Hsing village sewage sludge, cow dung from the ranch in Tung-Hai University, Cheng-Loong paper mill sewage sludge and waste activated sludge from Li-Min community), (B) substrate concentration (5, 10, 15 and 20 g COD/L), (C) temperature (40, 50, 60 and 70℃), (D) pH (5, 6, 7 and 8), (E) seed pretreatment (non, heat, acid and alkaline). In the fermentation of α-cellulose, the optimal conditions for maximum hydrogen production were the Chung-Hsing village sewage seed sludge in Nantou, cellulose concentration of 20 g COD/L, 50℃, pH 6 and heat pretreatment. The hydrogen production, hydrogen production rate and hydrogen yield were 75.2 mL, 10.5 mmol H2/L-d and 2.37 mmol H2/g COD, respectively. The optimal conditions for maximum ethanol production would be the waste activated sludge from Li-Min community in Taichung, cellulose concentration of 15 g COD/L, 50℃, pH 6 and heat pretreatment. The ethanol production and ethanol production rate were 3531 mg COD/L and 0.26 g EtOH/L-d. The Chung-Hsing village seed could hydrolyze cellulose effectively with endoglucanase activity. The Li-Min endoglucanase activity was too low to effectively hydrolyze, making the system only used reducing sugar to produce ethanol. Vinasse, which cellulose is protected by lignin, hemicellulose sheathing is more difficult to be hydrolyzed. In the fermentation of vinasse, the optimal conditions for maximum hydrogen and ethanol production were the cow dung from the ranch in Tung-Hai University, vinasse concentration of 80 g/L, 50℃, pH 6 and heat pretreatment. The hydrogen production, hydrogen production rate, hydrogen yield, ethanol production and ethanol production rate were 62.8 mL, 7.9 mmol H2/L-d, 0.40 mmol H2/g COD, 3050 mg COD/L and 0.22 g EtOH/L-d, respectively. Heat pretreatment of sludge bacteria could enhance the hydrogen and ethanol production from α-cellulose and vinasse.