In-situ biomethanation of high CO content syngas in agricultural biogas digesters
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2024-10
Department
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Mcode
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Language
en
Pages
11
Series
Renewable Energy, Volume 232
Abstract
To meet global energy demands, syngas with high CO content (>50 %) generated from hydrothermal gasification of agricultural residues or wood, could be utilized as a co-substrate in anaerobic digestion (AD) processes for conversion into CH4. This study investigated in-situ biomethanation using synthetic gas (55 % CO, 35 % H2, and 15 % CO2), mimicking wood gasification syngas, during AD of cow manure, the most abundant agricultural waste. A continuously stirred tank reactor (CSTR) served as a control and was fed only cow manure, while the other two reactors were fed syngas with or without gas recirculation at different gas loading rates (GLRs). In-situ syngas injection in AD of cow manure at GLRs ≤0.3 L LRV−1 d−1 improved overall CH4 productivity compared to the control (0.35 ± 0.1 vs. 0.29 ± 0.1 L LRV−1 d−1), though the CH4 content (45 ± 5 %) was lower than the control reactor (62 ± 3 %), indicating a need for biogas upgrading. Gas recirculation enabled higher CO and H2 conversion efficiencies of 99–100 % but considerably decreased CH4 productivity from cow manure. In-situ biomethanation enhanced the relative abundance of hydrogenotrophic methanogens, highlighting their role in syngas conversion to CH4.Description
Publisher Copyright: © 2024 The Authors
Keywords
Agricultural digesters, CO conversion efficiency, CO inhibition, Cow manure, In-situ syngas biomethanation, Wood gasification syngas
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Citation
Kamravamanesh, D, Rinta-Kanto, J M, Myllärinen, A, Saalasti, M, Rintala, J & Kokko, M 2024, ' In-situ biomethanation of high CO content syngas in agricultural biogas digesters ', Renewable Energy, vol. 232, 121056 . https://doi.org/10.1016/j.renene.2024.121056
