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Floating Membrane Bioreactors with High Gas Hold-Up for Syngas-to-Biomethane Conversion

Author

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  • Konstantinos Chandolias

    (Swedish Centre for Resource Recovery (SCRR), Faculty of Textiles engineering and Business, University of Borås, Allégatan 1, 501 90 Borås, Sweden)

  • Enise Pekgenc

    (Department of Environmental Engineering, Istanbul Technical University, Maslak, 34467 Sarıyer/İstanbul, Turkey)

  • Mohammad J. Taherzadeh

    (Swedish Centre for Resource Recovery (SCRR), Faculty of Textiles engineering and Business, University of Borås, Allégatan 1, 501 90 Borås, Sweden)

Abstract

The low gas-to-liquid mass transfer rate is one of the main challenges in syngas biomethanation. In this work, a new concept of the floating membrane system with high gas hold-up was introduced in order to enhance the mass transfer rate of the process. In addition, the effect of the inoculum-to-syngas ratio was investigated. The experiments were conducted at 55 °C with an anaerobic mixed culture in both batch and continuous modes. According to the results from the continuous experiments, the H 2 and CO conversion rates in the floating membrane bioreactor were approximately 38% and 28% higher in comparison to the free (suspended) cell bioreactors. The doubling of the thickness of the membrane bed resulted in an increase of the conversion rates of H 2 and CO by approximately 6% and 12%, respectively. The highest H 2 and CO consumption rates and CH 4 production rate recorded were approximately 22 mmol/(L·d), 50 mmol/(L·d), and 34.41 mmol/(L·d), respectively, obtained at the highest inoculum-to-syngas ratio of 0.2 g/mL. To conclude, the use of the floating membrane system enhanced the syngas biomethanation rates, while a thicker membrane bed resulted in even higher syngas conversion rates. Moreover, the increase of the inoculum-to-syngas ratio of up to 0.2 g/mL favored the syngas conversion.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:6:p:1046-:d:214958
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    References listed on IDEAS

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    1. Shen, Yanwen & Brown, Robert & Wen, Zhiyou, 2014. "Enhancing mass transfer and ethanol production in syngas fermentation of Clostridium carboxidivorans P7 through a monolithic biofilm reactor," Applied Energy, Elsevier, vol. 136(C), pages 68-76.
    2. Reinhard Rauch & Jitka Hrbek & Hermann Hofbauer, 2014. "Biomass gasification for synthesis gas production and applications of the syngas," Wiley Interdisciplinary Reviews: Energy and Environment, Wiley Blackwell, vol. 3(4), pages 343-362, July.
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    1. 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).
    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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