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Direct interspecies electron transfer stimulated by coupling of modified anaerobic granular sludge with microbial electrolysis cell for biogas production enhancement

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  • Wei, Yufang
  • Zhao, Hongbing
  • Qi, Xuejiao
  • Yang, Tianxue
  • Zhang, Junping
  • Chen, Wangmi
  • Li, Mingxiao
  • Xi, Beidou

Abstract

The magnetite nanoparticle-anaerobic granular sludge complex (Fe-AnGS) was formed by a biologically induced mineralization method, then applied in microbial electrolysis cells (MEC) to enhance the direct interspecies electron transfer (DIET) pathway via selective enriched electrogenic microorganisms for biogas production. Results showed with the highest Fe loading amount of 325.03 ± 8.40 mg/gVS, the magnetization and conductivity of Fe-AnGS were improved by 30.94 % and 29.16 %, respectively. The MEC with Fe-AnGS enriched the specific electrogenic microorganisms in the anode and cathode chambers. Simultaneously, genes coding for carbon dioxide reduction [M00567] increased by 29.40–43.54 % and 34.29–43.43 %, respectively. Inoculation of Fe-AnGS in MEC with glucose as substrate enhanced the experimental methane production of the cathode chambers (EMPC), and theoretical methane production of the cathode chamber (TMPCE) by 8.00–14.10 %, and 11.83–29.30 %, respectively. Consequently, inoculation of Fe-AnGS in MEC could establish and enhance the DIET pathway for methane production.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:appene:v:341:y:2023:i:c:s0306261923004646
    DOI: 10.1016/j.apenergy.2023.121100
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    References listed on IDEAS

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    1. Wan, Hongyou & Wang, Fuzhen & Chen, Yuhan & Zhao, Zisheng & Zhang, Guangyi & Dou, Ming & Xue, Binghan, 2021. "Enhanced Reactive Red 2 anaerobic degradation through improving electron transfer efficiency by nano-Fe3O4 modified granular activated carbon," Renewable Energy, Elsevier, vol. 179(C), pages 696-704.
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