Syngas biomethanation using trickle bed reactor, impact of external hydrogen addition at high loading rate.xlsx
<p dir="ltr">Syngas is a mixture of CO, CO<sub>2</sub>, and H<sub>2</sub> produced from gasification carbon-containing feedstocks. Syngas can be biologically converted into methane (CH<sub>4</sub>) using microbial consortia at lower energy input co...
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2025
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| Summary: | <p dir="ltr">Syngas is a mixture of CO, CO<sub>2</sub>, and H<sub>2</sub> produced from gasification carbon-containing feedstocks. Syngas can be biologically converted into methane (CH<sub>4</sub>) using microbial consortia at lower energy input compared to conventional catalytic processes called syngas biomethanation. However, challenges such as H<sub>2</sub> limitation, poor gas solubility, and cell damage from mechanical agitation impact conversion efficiency. Trickle bed reactors (TBRs) offer a promising solution to these challenges by enhancing gas-liquid transfer through biofilm formation on packing material while minimizing shear stress, thus improving CH<sub>4</sub> productivity. Accordingly, this study investigated the effect of external hydrogen (H<sub>2</sub>) injection on syngas biomethanation using two thermophilic TBRs at 51 ˚C. One TBR (TBR Control) was fed with syngas containing 15% CO, while the other received additional H<sub>2 </sub>(TBR Test). Both TBRs effectively converted syngas to CH<sub>4</sub>, but TBR Test achieved higher performance, with over 90% CH<sub>4</sub> conversion efficiency at a gas loading rate of 15 m<sup>3</sup>/m<sup>3</sup>·d and a peak CH<sub>4</sub> production rate of 4.5 mmol/L_bed·h at 20 m<sup>3</sup>/m<sup>3</sup>·d. Volatile fatty acid concentrations remained low. 16S rRNA sequencing analysis showed dominance of <i>Methanobacterium</i>, indicating methanogenesis-driven activity. Overall, the study highlights the benefit of H<sub>2</sub> injection during syngas biomethanation and suggests future work should focus on optimizing reactor control to further enhance capacity.</p> |
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