Syngas biomethanation in countercurrent flow trickle-bed reactor operated under different temperature conditions

Dominik Andreides, Dominik Stransky, Jana Bartackova, Dana Pokorna and Jana Zabranska

Renewable Energy, 2022, vol. 199, issue C, 1329-1335

Abstract: Syngas, a mixture of CO, H2, and CO2, is produced by waste carbonaceous feedstocks gasification, which plays an important role in renewable energy production. This study investigated the biomethanation of syngas (45% H2, 30% CO, 25% CO2) in a trickle-bed reactor operated under mesophilic (35 °C), hyper-mesophilic (45 °C), and thermophilic conditions (55 °C). The results revealed that CH4 production increased with increasing temperature. CH4 production under steady-state conditions at the hyper-mesophilic and thermophilic temperatures were comparable; 92.2 ± 1.7 mmol/(Lbed∙d) and 93.9 ± 0.9 mmol/(Lbed∙d), respectively. On the contrary, electron losses in volatile fatty acids were the highest under mesophilic conditions. Additionally, digestate can be dosed as a nutrient addition and as a continuous inoculum source to ensure the optimal syngas biomethanation performance. The hyper-mesophilic conditions strategy illustrates possible energy savings for bioreactor heating with CH4 production comparable to thermophilic conditions, thus saving operating costs.

Keywords: Syngas biomethanation; Trickle-bed reactor; Mesophilic; Hyper-mesophilic; Thermophilic (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:199:y:2022:i:c:p:1329-1335

DOI: 10.1016/j.renene.2022.09.072

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