期刊
BIORESOURCE TECHNOLOGY
卷 335, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125250
关键词
Anaerobic digestion; Slaughterhouse waste; Microbial symbiosis; Acetoclastic methanogenesis; Methane
资金
- National Research Foundation (NRF) of the Republic of Korea [2019R1I1A1A01063318, 2020R1A2C3004237]
- National Research Foundation of Korea [2020R1A2C3004237, 2019R1I1A1A01063318] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Different inoculum to slaughterhouse waste ratios influence digester performance, substrate utilization, and methane yield through microbial shifts and metabolic syntrophy. Interactions among acetogenic and acetate-oxidizing species with methanogens play a critical role in improving methanogenic activity. Syntrophic interactions among core microbiota induce major metabolic activities and quorum sensing.
Different inoculum to slaughterhouse waste (SHW) ratios (Ino/SHW) influences the digester performance, substrate utilization, and methane yield through microbial shift and their metabolic syntrophy. Acetoclastic Methanosarcina (68-87%) was dominant in the exponential phase, overpowering the initial abundance of Methanosaeta (86% of methanogens) in the SHW digesters. Positive interactions among acetogenic and acetateoxidizing species of Clostridium (11%) with Methanosarcina (84% of methanogens) improved the methanogenic activity (292 mL g-1 VSinitial d-1) and final VS utilization (90%) at the highest Ino/SHW loading. In contrast, significant improvement of methane yield (152% higher than the control) at the lowest Ino/SHW loading was attributed to strong syntrophy among Methanosaeta (24% of methanogens) and its exoelectrogenic partners, Bythopirellula (0.52%) and Mariniphaga (0.08%) and the acetogenic Cloacimonas (0.16%) and Longilinea (0.32%). These syntrophic interactions among the core microbiota induced major metabolic activities, including butanoate, glycine, serine and threonine, methane, propanoate, and pyruvate metabolism, and quorum sensing.
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