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In Situ Biogas Upgrading in a Randomly Packed Gas-Stirred Tank Reactor (GSTR)

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  • Giuseppe Lembo

    (Biotechnological Processes for Energy & Industry Laboratory (PBE), Department of Energy Technologies and Renewables, ENEA, Casaccia R.C., 00123 Rome, Italy
    Current address: Department of Earth and Environmental Sciences, University of Milano-Bicocca, 20126 Milan, Italy.)

  • Silvia Rosa

    (Biotechnological Processes for Energy & Industry Laboratory (PBE), Department of Energy Technologies and Renewables, ENEA, Casaccia R.C., 00123 Rome, Italy)

  • Antonella Marone

    (Biotechnological Processes for Energy & Industry Laboratory (PBE), Department of Energy Technologies and Renewables, ENEA, Casaccia R.C., 00123 Rome, Italy)

  • Antonella Signorini

    (Biotechnological Processes for Energy & Industry Laboratory (PBE), Department of Energy Technologies and Renewables, ENEA, Casaccia R.C., 00123 Rome, Italy)

Abstract

This study evaluated different strategies to increase gas–liquid mass transfer in a randomly packed gas stirred tank reactor (GSTR) continuously fed with second cheese whey (SCW), at thermophilic condition (55 °C), for the purpose of carrying out in situ biogas upgrading. Two different H 2 addition rates (1.18 and 1.47 L H2 L R −1 d −1 ) and three different biogas recirculation rates (118, 176 and 235 L L R −1 d −1 ) were applied. The higher recirculation rate showed the best upgrading performance; H 2 utilization efficiency averaged 88%, and the CH 4 concentration in biogas increased from 49.3% during conventional anaerobic digestion to 75%, with a methane evolution rate of 0.37 L CH4 L R −1 d −1 . The microbial community samples were collected at the end of each experimental phase, as well as one of the thermophilic sludge used as inoculum; metanogenomic analysis was performed using Illumina-based 16S sequencing. The whole microbial community composition was kept quite stable throughout the conventional anaerobic digestion (AD) and during the H 2 addition experimental phases (UP1, UP2, UP3, UP4). On the contrary, the methanogens community was deeply modified by the addition of H 2 to the GSTR. Methanogens of the Methanoculleus genus progressively increased in UP1 (47%) and UP2 (51%) until they became dominant in UP3 (94%) and UP4 (77%). At the same time, members of Methanotermobacter genus decreased to 19%, 23%, 3% and 10% in UP1, UP2, UP3 and UP4, respectively. In addition, members of the Methanosarcina genus decreased during the hydrogen addition phases.

Suggested Citation

  • Giuseppe Lembo & Silvia Rosa & Antonella Marone & Antonella Signorini, 2023. "In Situ Biogas Upgrading in a Randomly Packed Gas-Stirred Tank Reactor (GSTR)," Energies, MDPI, vol. 16(7), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:7:p:3296-:d:1117723
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    References listed on IDEAS

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    2. Voelklein, M.A. & Rusmanis, Davis & Murphy, J.D., 2019. "Biological methanation: Strategies for in-situ and ex-situ upgrading in anaerobic digestion," Applied Energy, Elsevier, vol. 235(C), pages 1061-1071.
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    5. Vo, Truc T.Q. & Wall, David M. & Ring, Denis & Rajendran, Karthik & Murphy, Jerry D., 2018. "Techno-economic analysis of biogas upgrading via amine scrubber, carbon capture and ex-situ methanation," Applied Energy, Elsevier, vol. 212(C), pages 1191-1202.
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