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Sequencing batch dry anaerobic digestion of mixed feedstock regulating strategies for methane production: Multi-factor interactions among biotic and abiotic characteristics

Author:
Yu, Jiadong, Zhao, Lixin, Feng, Jing, Yao, Zonglu, Huang, Kaiming, Luo, Juan, Wei, Shimeng, Chen, Jiankun
Source:
Bioresource technology 2019 v.284 pp. 276-285
ISSN:
0960-8524
Subject:
anaerobic digestion, corn stover, cow manure, feedstocks, inoculum, methane production, methanogens, synergism, volatile fatty acids
Abstract:
This study investigated the synergistic effects and regulation strategy of multiple factors for improving methane production in sequencing batch dry anaerobic digestion (SBD-AD) using corn stalks (CS) and cow dung (CD). The regulation of the spray frequency (SF) and inoculum content (IC) significantly improved methane yield, which increased feedstock ratios (FRs) by 12.4–121.3%. Moreover, the relationship between SF and IC produced distinct interaction modes. An FR of 4:6 increased the SF to 2 h for the CD-rich condition, and an FR of 6:4 decreased the SF during a 6 h interval and increased the IC for the CS-rich condition, resulting in increases in methane yield and the conversion efficiency of volatile fatty acids (VFAs). Methanogenesis (Methanogens) played a key role in SBD-AD. The nutrient substrate (NH4-N+) and key enzyme activities of methanogens were significantly affected such that the synergistic effect of the acetoclastic and hydrogenotrophic methanogenesis pathways was likely strengthened.
Agid:
6359440