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Article Dans Une Revue Bioresource Technology Année : 2021

Biomethanation of syngas by enriched mixed anaerobic consortium in pressurized agitated column

Résumé

In a circular economy approach, heterogeneous wastes can be upgraded to energy in the form of syngas via pyrogasification, and then to methane via biomethanation. Working at high pressure is a promising approach to intensify the process and to reduce gas-liquid transfer limitations. However, raising the pressure could lead to reaching the CO inhibition threshold of the microorganisms involved in syngas-biomethanation. To investigate the impact on pressure on the process, a 10L continuous stirred tank reactor working at 4 bars and 55 °C was implemented. Syngas (40% CO, 40% H2, 20% CO2) biomethanation was performed successfully and methane productivity as high as 6.8 mmolCH4/Lreactor/h with almost full conversion of CO (97%) and H2 (98%) was achieved. CO inhibition was investigated and carboxydotrophs appeared less resistant to high CO exposition than methanogens.
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Dates et versions

hal-03312971 , version 1 (03-08-2021)

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J. Figueras, H. Benbelkacem, C. Dumas, Pierre Buffière. Biomethanation of syngas by enriched mixed anaerobic consortium in pressurized agitated column. Bioresource Technology, 2021, 338, ⟨10.1016/j.biortech.2021.125548⟩. ⟨hal-03312971⟩
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