Syngas biomethanation using trickle bed reactor, impact of external hydrogen addition at high loading rate

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-06-30 DOI:10.1016/j.biteb.2025.102197

Begüm Bilgiç , Thea Os Andersen , Getachew Birhanu Abera , Michal Sposób , Lu Feng , Svein Jarle Horn

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Abstract

Syngas biomethanation represents a promising pathway to convert recalcitrant feedstocks into biomethane. However, the hydrogen (H₂) content in syngas is often insufficient or fluctuates, which affects the overall performance. This study evaluated the effect of H₂ addition on syngas conversion efficiency and microbial community dynamics using two trickle bed reactors (TBRs). One TBR was fed with syngas, while another received syngas supplemented with H₂. Both TBRs demonstrated the feasibility of converting CO from syngas to methane, with the H₂ supplemented TBR outperforming the syngas-only TBR. The H₂ supplemented TBR achieved over 90 % conversion rate at a gas loading rate of 15 NL/L_reactor/d and reached peak methane production at a gas loading rate at 20 NL/L_reactor/d. Microbial community structure analysis revealed a dominance of Methanobacterium, a known thermophilic hydrogenotrophic methanogen. Although H₂ addition enhanced performance, a decline in conversion efficiency at higher gas loading rates highlights the need for further optimization.

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滴流床反应器合成气生物甲烷化研究高负荷下外加氢的影响

合成气生物甲烷化是一种将顽固性原料转化为生物甲烷的有前途的途径。但合成气中氢气（H2）含量往往不足或波动，影响整体性能。采用两个滴流床反应器（TBRs），研究了加氢对合成气转化效率和微生物群落动态的影响。一个TBR饲喂合成气，另一个TBR饲喂添加H2的合成气。两种TBR都证明了将CO从合成气转化为甲烷的可行性，其中H2补充TBR的性能优于纯合成气TBR。当气载率为15 NL/Lreactor/d时，加氢TBR的转化率超过90%，当气载率为20 NL/Lreactor/d时，甲烷产量达到峰值。微生物群落结构分析显示甲烷菌（Methanobacterium）占主导地位，这是一种已知的嗜热氢养甲烷菌。虽然H2的加入提高了性能，但在更高的气体负载率下，转换效率的下降凸显了进一步优化的必要性。

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