Study of Anaerobic Co-digestion of Solid Kitchen Waste and Organic Wastes

• Main Authors: Yang, Ching-Yu, 楊晴喩
• Other Authors: Tseng, Ching-Ping
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/huw4nf

碩士 === 國立交通大學 === 分子醫學與生物工程研究所 === 108 === The low carbon to nitrogen ratio (C/N) and easy acidification of the kitchen waste (KW) cause the low efficiency and stability of its anaerobic digestion. Thus, KW can co-digestion with other organic wastes such as animal waste and straw. The co-digestion has many advantages, such as regulating carbon-nitrogen ratio, increasing biogas production and improving utilization efficiency. To evaluate the gas production effect and organic waste treatment efficiency, KW and swine solid waste (SW) were evaluated under different mixing ratios. The KW was adjusted C/N ratio by acid-catalyzed water heat pretreatment of rice straw. The results in the anaerobic co-digestion batch test indicated that the kitchen waste and swine solid waste mixing as 7:1 ratio in the S/I ratio 1 displayed more efficient than individual substances. Biogas production potential and methane production potential of all anaerobic digestion with individual substances were 0.35 L-Biogas/g-COD and 138.9 mL-CH4/g-COD respectively. When the co-digestion mixing as 7:1 (KW: SW) ratio in dry anaerobic digester, biogas yield and methane yield were 0.81 m3/kg VSadded and 0.25 m3/kg VSadded. When the C/N ratio of the KW co-digestion with acid-catalyzed water heat pretreatment of rice straw was adjusted to 25, and the pH was adjusted to 7 in dry anaerobic digester, biogas yield and methane yield were 0.73 m3/kg VSadded and 0.20 m3/kg VSadded. In these two conditions, the volatile solid reduction rate is 91.4% and 91.6%. Since there was no study of kitchen waste co-digestion with swine solid waste or rice straw in dry anaerobic digester; therefore, the operating parameters of this study can provide kitchen waste co-digestion with different organic wastes in large-scale dry anaerobic digester.