Magnetite-boosted syntrophic conversion of acetate to methane during thermophilic anaerobic digestion

Using a batch thermophilic anaerobic system established with 60 mL serum bottles, the mechanism on how microbial enrichments obtained from magnetite-amended paddy soil via repeated batch cultivation affected methane production from acetate was investigated. Magnetite-amended enrichments (MAEs) can i...

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Bibliographic Details
Published in:Water science and technology 2024-01, Vol.89 (1), p.160-169
Main Authors: Wu, Zi-Fan, Li, Zhao-Long, Liu, Qing-Hua, Yang, Zhi-Man
Format: Article
Language:English
Subjects:
acetate
Acetates - metabolism
Anaerobiosis
Bioreactors
Electron Transport
Euryarchaeota - metabolism
Ferrosoferric Oxide
interspecies electron transfer
magnetite
methane
Methane - metabolism
microbial community structure
thermophilic anaerobic digestion
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Summary:Using a batch thermophilic anaerobic system established with 60 mL serum bottles, the mechanism on how microbial enrichments obtained from magnetite-amended paddy soil via repeated batch cultivation affected methane production from acetate was investigated. Magnetite-amended enrichments (MAEs) can improve the methane production rate rather than the methane yield. Compared with magnetite-unamended enrichments, the methane production rate in MAE was improved by 50%, concomitant with the pronounced electrochemical response, high electron transfer capacity, and fast acetate degradation. The promoting effects might be ascribed to direct interspecies electron transfer facilitated by magnetite, where magnetite might function as electron conduits to link the acetate oxidizers (Anaerolineaceae and Peptococcaceae) with methanogens (Methanosarcinaceae). The findings demonstrated the potential application of MAE for boosting methanogenic performance during thermophilic anaerobic digestion.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2023.421