Effects of different carbon to nitrogen ratios on anaerobic co-digestion of leather limed fleshing and rice straws

• Main Authors: Wei-Chen Chen, 陳偉禎
• Other Authors: 徐濟泰
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/32827817008560897525

碩士 === 國立臺灣大學 === 動物科學技術學研究所 === 105 === This study aimed to investigate the effect of different carbon to nitrogen ratios (C/N) on methane yield, changes of liquid phase, and solid digestibility in anaerobic co-digestion of leather limed fleshing mixed with rice straws. Four treatments with C/N of 10, 15, 20 and 25 were operated in liquid-state mesophilic batch experiment in triplicates at the same initial pH value. After 48 days of digestion, results showed that C/N of 10 had the highest total methane yield, daily average methane yield, solid digestion, and methane productivity, whereas its digestion time (42 days) was the longest among treatments and had the highest concentration of total ammonia nitrogen. On the contrary, when increasing C/N, decreased total methane yield, solid digestion, and methane productivity were observed. However, it followed by shorter digestion time and lower production of total ammonia nitrogen. In conclusion, adding rice straws to increase C/N above 10 could not benefit in either methane yield or disposing leather limed fleshing. Future work should focus on searching for other high-degradable carbon source, increasing solid content, and optimizing inoculum to substrate ratio in hope for improving methane yield.