1. Food waste impact on dry anaerobic digestion of straw in a novel reactor: Biogas yield, stability, and hydrolysis-methanogenesis processes.
- Author
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Chen, Xiaotian, He, Huiban, Zhu, Na, Jia, Peiqiao, Tian, Jinxiang, Song, Wenyue, Cui, Zongjun, and Yuan, Xufeng
- Subjects
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FOOD waste , *ANAEROBIC digestion , *AGRICULTURAL waste recycling , *BIOGAS , *CORN straw , *STRAW - Abstract
[Display omitted] • • The novel reactor allows dry anaerobic digestion of food waste (FW) and straw. • • The methane yield of FW and straw co-digestion could reach 494.2 mL CH 4 /g VS. • • FW significantly improved the anaerobic biodegradability of the substrate (85.7%). • • Co-digestion can improve hydrolysis and acid production efficiency. • • The acetotrophic methanogenic pathway significantly affects the methane yield. Gradient anaerobic digestion reactor (GADR) can improve substrate utilization efficiency by solving the problem of the "short circuit" of materials. However, the substrate's composition significantly affects the reactor's performance. This study investigated the impact of food waste (FW) levels on corn straw's dry anaerobic digestion (AD) in a novel GADR. The results show that biomethane production can be improved by coupling urban and agricultural solid waste recycling. The mechanism is to increase the hydrolysis and acid production efficiency, and the abundance of enzymes related to methanogenesis. The maximum methane yield (494.2 mL CH 4 /g VS) and the highest anaerobic biodegradability (85.7 %) were obtained when the FW was added at 60 %. The co-digestion of FW and straw can improve the hydrolysis and acid production efficiency and methane yield, which improves the buffering capacity and stability of the system compared with the single digestion of FW. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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