Biodrying of biogas residue through a thermophilic bacterial agent inoculation: Insights into dewatering contribution and microbial mechanism

•Biodrying of biogas residue (BR) decreased moisture content from 90.4% to 9.4%.•The drying contribution of thermophilic bacterial agent (TBA) accounted for 78.7%.•Germination index of BR raised from 21.9% to 107.3% after biodrying with TBA.•Biodrying with TBA increased diversity and abundance of fu...

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Bibliographic Details
Published in:Bioresource technology 2022-07, Vol.355, p.127256-127256, Article 127256
Main Authors: Xu, Mingyue, Sun, Haishu, Yang, Min, Xie, Dong, Sun, Xiaohong, Meng, Jie, Wang, Qunhui, Wu, Chuanfu
Format: Article
Language:English
Subjects:
Biodrying
Biogas residue
Dewatering contribution
Microbial community
Thermophilic bacterial agent
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Summary:•Biodrying of biogas residue (BR) decreased moisture content from 90.4% to 9.4%.•The drying contribution of thermophilic bacterial agent (TBA) accounted for 78.7%.•Germination index of BR raised from 21.9% to 107.3% after biodrying with TBA.•Biodrying with TBA increased diversity and abundance of functional bacteria. Biogas residue (BR) is difficult to transport and compost due to its high moisture content. The purpose of this study was to elucidate the dewatering and microbial mechanisms underlying the inoculation of a thermophilic bacterial agent (TBA) onto BR with a high moisture content (i.e., 90.4%). TBA accounted for 78.7% of the water loss rate in BR, dramatically higher than the effects of aeration, external heat, or indigenous microorganisms (i.e., 1.8%, 0.1%, and 19.4%, respectively). Furthermore, TBA inoculation resulted in a stable product [with a low moisture content (9.4%) and a high seed germination index (107.3%)]. Finally, TBA increased microbial diversity and the abundance of functional bacteria (Proteobacteria and Bacteroidota), which might be beneficial for refractory organic compound decomposition and plant growth. Thus, biodrying BR via inoculation with a TBA is recommended economically.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2022.127256