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Scale up study of a thermophilic trickle bed reactor performing syngas biomethanation

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  • Asimakopoulos, Konstantinos
  • Kaufmann-Elfang, Martin
  • Lundholm-Høffner, Christoffer
  • Rasmussen, Niels B.K.
  • Grimalt-Alemany, Antonio
  • Gavala, Hariklia N.
  • Skiadas, Ioannis V.

Abstract

Biomethane constitutes an important biofuel for the transition towards a biobased circular economy with a sustainable energy sector. An environmentally friendly pathway for its production is through the gasification of 2nd generation biomass that generates syngas (H2, CO, and CO2), followed by syngas biomethanation. A novel design thermophilic trickle bed bioreactor was successfully tested at semi-pilot scale. It was operated continuously performing biomethanation of an artificial syngas mixture (45% H2, 20% CO, 25% CO2 and 10% N2). Its effectiveness was compared to a primitive design lab scale trickle bed reactor with a 28 times lower bed volume under identical operating conditions. At an empty bed residence time of 0.6 h, the novel semi-pilot scale trickle bed reactor converted 100% and 98% of the influent H2 and CO, respectively and produced CH4 at a rate of 10.6 ± 0.2 mmol·lbed−1·h−1, whereas the lab scale reactor converted 89% of the H2 and 73% of the CO and achieved a CH4 productivity of 8.5 mmol·lbed−1·h−1. The maximum CH4 productivity achieved in the semi-pilot scale reactor was 17.6 ± 0.6 mmol·lbed−1·h−1 at an empty bed residence time of 0.33 h with a 99.2 ± 0.1% product selectivity. Furthermore, the semi-pilot scale reactor was connected in series with a fluidized bed gasifier fed with wood pellets to assess the biomethanation potential of the system when supplied with real syngas. The obtained results showed no process inhibition in the semi-pilot scale reactor, which accomplished 100% H2 conversion efficiency and 92.4 ± 0.6% CO conversion efficiency at an empty bed residence time of 0.6 h.

Suggested Citation

  • Asimakopoulos, Konstantinos & Kaufmann-Elfang, Martin & Lundholm-Høffner, Christoffer & Rasmussen, Niels B.K. & Grimalt-Alemany, Antonio & Gavala, Hariklia N. & Skiadas, Ioannis V., 2021. "Scale up study of a thermophilic trickle bed reactor performing syngas biomethanation," Applied Energy, Elsevier, vol. 290(C).
  • Handle: RePEc:eee:appene:v:290:y:2021:i:c:s0306261921002786
    DOI: 10.1016/j.apenergy.2021.116771
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    References listed on IDEAS

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    1. Strübing, Dietmar & Moeller, Andreas B. & Mößnang, Bettina & Lebuhn, Michael & Drewes, Jörg E. & Koch, Konrad, 2018. "Anaerobic thermophilic trickle bed reactor as a promising technology for flexible and demand-oriented H2/CO2 biomethanation," Applied Energy, Elsevier, vol. 232(C), pages 543-554.
    2. Horschig, Thomas & Adams, P.W.R. & Gawel, Erik & Thrän, Daniela, 2018. "How to decarbonize the natural gas sector: A dynamic simulation approach for the market development estimation of renewable gas in Germany," Applied Energy, Elsevier, vol. 213(C), pages 555-572.
    3. Grimalt-Alemany, Antonio & Asimakopoulos, Konstantinos & Skiadas, Ioannis V. & Gavala, Hariklia N., 2020. "Modeling of syngas biomethanation and catabolic route control in mesophilic and thermophilic mixed microbial consortia," Applied Energy, Elsevier, vol. 262(C).
    4. Konstantinos Chandolias & Enise Pekgenc & Mohammad J. Taherzadeh, 2019. "Floating Membrane Bioreactors with High Gas Hold-Up for Syngas-to-Biomethane Conversion," Energies, MDPI, vol. 12(6), pages 1-14, March.
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    2. Andreides, Dominik & Stransky, Dominik & Bartackova, Jana & Pokorna, Dana & Zabranska, Jana, 2022. "Syngas biomethanation in countercurrent flow trickle-bed reactor operated under different temperature conditions," Renewable Energy, Elsevier, vol. 199(C), pages 1329-1335.

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