Biogas Production of Kitchen Waste by Dry Anaerobic Digestion

• Main Authors: Mai, Shuo-Ting, 麥碩庭
• Other Authors: Tseng, Ching-Ping
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/e89257

碩士 === 國立交通大學 === 生物科技學系 === 106 === In this study, we established a lab-scale dry anaerobic fermentation reactor for biogas production form kitchen waste, and evaluated the biogas production potential in different reactor condition, the microbial community was investigated by denaturing gradient gel electrophoresis (DGGE). In addition, we analyzed the characteristics of fermentation residues, the seed germination and planting was tested for being ferterlizer. The results revealed mesophilic condition as well as thermophilic condition produced same biogas amount until 23th day of fermentation, but the biogas production rate under thermophilic condition (55°C) was twice times faster than mesophilic condition (35°C). As increasing rinsing rate of circulating water, the better biogas production was harvested, biogas production efficiency with thermophilic and high rinsing rate reached 520L/kg-VSadd/10days, which was an extremely high biomethane potential for dry anaerobic fermentation reactor. Furthermore, an inhibition of biogas production in continuously operation has been confirmed by the cumulative ammonia concentration in circulating water, we had improved the system with at least 80% efficiency of biogas production in continuously operation by diluting the ammonia concentration less than 1500 mg/L in circulating water. In the microbial community analysis, DGGE revealed the distribution patterns of 16s rRNA were various between mesophilic and thermophilic condition but remained constant under different rinsing rate. Seed germination test had confirmed the maturity of the fermentation residues, but the organic content in residues is less than the commercially organic fertilizer, yet the fermentation residues was positive in conducive to crop growth.