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Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process

Author

Listed:
  • Andreas Lemmer

    (State Institute of Agricultural Engineering and Bioenergy, University Hohenheim, Garbenstraße 9, D-70599 Stuttgart, Germany)

  • Yuling Chen

    (State Institute of Agricultural Engineering and Bioenergy, University Hohenheim, Garbenstraße 9, D-70599 Stuttgart, Germany
    These authors contributed equally to this work.)

  • Anna-Maria Wonneberger

    (DVGW–Research Center at the Engler-Bunte-Institut, Karlsruhe Institute of Technology (KIT), Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany
    These authors contributed equally to this work.)

  • Frank Graf

    (DVGW–Research Center at the Engler-Bunte-Institut, Karlsruhe Institute of Technology (KIT), Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany)

  • Rainer Reimert

    (Engler-Bunte-Institut, Division Chemical Energy Carriers and Fuel Technology, Karlsruhe Institute of Technology (KIT), Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany)

Abstract

Two-stage pressurized anaerobic digestion is a promising technology. This technology integrates in one process biogas production with upgrading and pressure boosting for grid injection. To investigate whether the efficiency of this novel system could be further increased, a water scrubbing system was integrated into the methanogensis step. Therefore, six leach-bed reactors were used for hydrolysis/acidification and a 30-L pressurized anaerobic filter operated at 9 bar was adopted for acetogenesis/methanogenesis. The fermentation liquid of the pressurized anaerobic filter was circulated periodically via a flash tank, operating at atmospheric pressure. Due to the pressure drop, part of dissolved carbon dioxide was released from the liquid phase into the flash tank. The depressurized fermentation liquid was then recycled to the pressurized reactor. Three different flow rates (0 L·day −1 , 20 L·day −1 and 40 L·day −1 ) were tested with three repetitions. As the daily recycled flashed liquid flow was increased from 0 to 40 L, six times as much as the daily feeding, the methane content in the biogas increased from 75 molar percent (mol%) to 87 mol%. The pH value of the substrate in the methane reactor rose simultaneously from 6.5 to 6.7. The experimental data were verified by calculation.

Suggested Citation

  • Andreas Lemmer & Yuling Chen & Anna-Maria Wonneberger & Frank Graf & Rainer Reimert, 2015. "Integration of a Water Scrubbing Technique and Two-Stage Pressurized Anaerobic Digestion in One Process," Energies, MDPI, vol. 8(3), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:3:p:2048-2065:d:46792
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    References listed on IDEAS

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    1. Szarka, Nora & Scholwin, Frank & Trommler, Marcus & Fabian Jacobi, H. & Eichhorn, Marcus & Ortwein, Andreas & Thrän, Daniela, 2013. "A novel role for bioenergy: A flexible, demand-oriented power supply," Energy, Elsevier, vol. 61(C), pages 18-26.
    2. Chen, Yuling & Rößler, Benjamin & Zielonka, Simon & Lemmer, Andreas & Wonneberger, Anna-Maria & Jungbluth, Thomas, 2014. "The pressure effects on two-phase anaerobic digestion," Applied Energy, Elsevier, vol. 116(C), pages 409-415.
    3. Yuling Chen & Benjamin Rößler & Simon Zielonka & Anna-Maria Wonneberger & Andreas Lemmer, 2014. "Effects of Organic Loading Rate on the Performance of a Pressurized Anaerobic Filter in Two-Phase Anaerobic Digestion," Energies, MDPI, vol. 7(2), pages 1-15, February.
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    Cited by:

    1. Collins, B.A. & Birzer, C.H. & Harris, P.W. & Kidd, S.P. & McCabe, B.K. & Medwell, P.R., 2023. "Two-phase anaerobic digestion in leach bed reactors coupled to anaerobic filters: A review and the potential of biochar filters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 175(C).
    2. Budzianowski, Wojciech M., 2016. "A review of potential innovations for production, conditioning and utilization of biogas with multiple-criteria assessment," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1148-1171.
    3. Lemmer, Andreas & Merkle, Wolfgang & Baer, Katharina & Graf, Frank, 2017. "Effects of high-pressure anaerobic digestion up to 30 bar on pH-value, production kinetics and specific methane yield," Energy, Elsevier, vol. 138(C), pages 659-667.

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