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Biological biogas upgrading capacity of a hydrogenotrophic community in a trickle-bed reactor

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  • Rachbauer, Lydia
  • Voitl, Gregor
  • Bochmann, Günther
  • Fuchs, Werner

Abstract

The current study reports on biological biogas upgrading by means of hydrogen addition to obtain biomethane. A mesophilic (37°C) 0.058m3 trickle-bed reactor with an immobilized hydrogenotrophic enrichment culture was operated for a period of 8months using a substrate mix of molecular hydrogen (H2) and biogas (36–42% CO2). Complete CO2 conversion (>96%) was achieved up to a H2 loading rate of 6.5mn3H2/m3reactor vol.×d, corresponding to 2.3h gas retention time. The optimum H2/CO2 ratio was determined to be between 3.67 and 4.15. CH4 concentrations above 96% were achieved with less than 0.1% residual H2. This gas quality complies even with tightest standards for grid injection without the need for additional CO2 removal. If less rigid standards must be fulfilled H2 loading rates can be almost doubled (10.95 versus 6.5mn3H2/m3reactor vol.×d) making the process even more attractive. At this H2 loading the achieved methane productivity was 2.52mn3CH4/m3reactor vol.×d. In terms of biogas this corresponds to an upgrading capacity of 6.9mn3biogas/m3reactor vol.×d. The conducted experiments demonstrate that biological methanation in an external reactor is well feasible for biogas upgrading under the prerequisite that an adequate H2 source is available.

Suggested Citation

  • Rachbauer, Lydia & Voitl, Gregor & Bochmann, Günther & Fuchs, Werner, 2016. "Biological biogas upgrading capacity of a hydrogenotrophic community in a trickle-bed reactor," Applied Energy, Elsevier, vol. 180(C), pages 483-490.
    • Handle: RePEc:eee:appene:v:180:y:2016:i:c:p:483-490
    DOI: 10.1016/j.apenergy.2016.07.109
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    1. Götz, Manuel & Lefebvre, Jonathan & Mörs, Friedemann & McDaniel Koch, Amy & Graf, Frank & Bajohr, Siegfried & Reimert, Rainer & Kolb, Thomas, 2016. "Renewable Power-to-Gas: A technological and economic review," Renewable Energy, Elsevier, vol. 85(C), pages 1371-1390.
    2. Sun, Qie & Li, Hailong & Yan, Jinying & Liu, Longcheng & Yu, Zhixin & Yu, Xinhai, 2015. "Selection of appropriate biogas upgrading technology-a review of biogas cleaning, upgrading and utilisation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 521-532.
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