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Biogas upgrading and energy storage via electromethanogenesis using intact anaerobic granular sludge as biocathode

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  • Zhou, Huihui
  • Xing, Defeng
  • Xu, Mingyi
  • Su, Yanyan
  • Zhang, Yifeng

Abstract

Microbial electrochemical system is a promising CO2-to-CH4 conversion technology that can upgrade raw biogas to high calorific content for downstream applications. The development of efficient, robust, and cost-effective biocathode is the pivotal issue for its industrial application. In this study, intact anaerobic granular sludge (AGS), which was the conventional biocatalyst in anaerobic digestion processes for high-efficiency CH4 production, was for the first time employed as biocathode in electromethanogenesis system (EM) for biogas upgrading. The applied voltage (0, 3, 4, and 5 V) and biogas flow rate (5.22–23.43 mL/h) were modulated to optimize biogas upgrading performance in the AGS-EM system. The CH4 content in treated biogas could reach as high as 97.9 ± 2.3% at an applied voltage of 4 V and a gas flow rate of 17.79 mL/h. The system showed superior stability and anti-interference ability in the continuous operation mode for 2 months. 16S rRNA sequencing results showed that Methanobacterium and Azoarcus were the dominant populations in biocathode. The AGS-EM system obtained an energy benefit of 477.3 kJ/molbiogas, and economic benefit of 446.4 EUR/m3biogas. The novel AGS-EM system showed the promising perspectives for the industrial application in the field of biogas upgrading and renewable energy storage.

Suggested Citation

  • Zhou, Huihui & Xing, Defeng & Xu, Mingyi & Su, Yanyan & Zhang, Yifeng, 2020. "Biogas upgrading and energy storage via electromethanogenesis using intact anaerobic granular sludge as biocathode," Applied Energy, Elsevier, vol. 269(C).
  • Handle: RePEc:eee:appene:v:269:y:2020:i:c:s0306261920306139
    DOI: 10.1016/j.apenergy.2020.115101
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    References listed on IDEAS

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    1. Scarlat, Nicolae & Dallemand, Jean-François & Fahl, Fernando, 2018. "Biogas: Developments and perspectives in Europe," Renewable Energy, Elsevier, vol. 129(PA), pages 457-472.
    2. Huang, Zhe & Lu, Lu & Jiang, Daqian & Xing, Defeng & Ren, Zhiyong Jason, 2017. "Electrochemical hythane production for renewable energy storage and biogas upgrading," Applied Energy, Elsevier, vol. 187(C), pages 595-600.
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    Cited by:

    1. Wei, Yufang & Zhao, Hongbing & Qi, Xuejiao & Yang, Tianxue & Zhang, Junping & Chen, Wangmi & Li, Mingxiao & Xi, Beidou, 2023. "Direct interspecies electron transfer stimulated by coupling of modified anaerobic granular sludge with microbial electrolysis cell for biogas production enhancement," Applied Energy, Elsevier, vol. 341(C).
    2. Pelaz, Guillermo & González, Rubén & Morán, Antonio & Escapa, Adrián, 2023. "Elucidating the impact of power interruptions on microbial electromethanogenesis," Applied Energy, Elsevier, vol. 331(C).
    3. Wu, Benteng & Lin, Richen & Kang, Xihui & Deng, Chen & Dobson, Alan D.W. & Murphy, Jerry D., 2021. "Improved robustness of ex-situ biological methanation for electro-fuel production through the addition of graphene," Renewable and Sustainable Energy Reviews, Elsevier, vol. 152(C).
    4. Wu, Lan & Wei, Wei & Song, Lan & Woźniak-Karczewska, Marta & Chrzanowski, Łukasz & Ni, Bing-Jie, 2021. "Upgrading biogas produced in anaerobic digestion: Biological removal and bioconversion of CO2 in biogas," Renewable and Sustainable Energy Reviews, Elsevier, vol. 150(C).

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