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Anode Modification with Fe 2 O 3 Affects the Anode Microbiome and Improves Energy Generation in Microbial Fuel Cells Powered by Wastewater

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  • Dawid Nosek

    (Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Słoneczna 45 G, 10-709 Olsztyn, Poland)

  • Tomasz Mikołajczyk

    (Department of Chemistry, University of Warmia and Mazury in Olsztyn, plac Łódzki 4, 10-721 Olsztyn, Poland)

  • Agnieszka Cydzik-Kwiatkowska

    (Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Słoneczna 45 G, 10-709 Olsztyn, Poland)

Abstract

This study investigated how anode electrode modification with iron affects the microbiome and electricity generation of microbial fuel cells (MFCs) fed with municipal wastewater. Doses of 0.0 (control), 0.05, 0.1, 0.2, and 0.4 g Fe 2 O 3 per the total anode electrode area were tested. Fe 2 O 3 doses from 0.05 to 0.2 g improved electricity generation; with a dose of 0.10 g Fe 2 O 3 , the cell power was highest (1.39 mW/m 2 ), and the internal resistance was lowest (184.9 Ω). Although acetate was the main source of organics in the municipal wastewater, propionic and valeric acids predominated in the outflows from all MFCs. In addition, Fe-modification stimulated the growth of the extracellular polymer producers Zoogloea sp. and Acidovorax sp., which favored biofilm formation. Electrogenic Geobacter sp. had the highest percent abundance in the anode of the control MFC, which generated the least electricity. However, with 0.05 and 0.10 g Fe 2 O 3 doses, Pseudomonas sp., Oscillochloris sp., and Rhizobium sp. predominated in the anode microbiomes, and with 0.2 and 0.4 g doses, the electrogens Dechloromonas sp. and Desulfobacter sp. predominated. This is the first study to holistically examine how different amounts of Fe on the anode affect electricity generation, the microbiome, and metabolic products in the outflow of MFCs fed with synthetic municipal wastewater.

Suggested Citation

  • Dawid Nosek & Tomasz Mikołajczyk & Agnieszka Cydzik-Kwiatkowska, 2023. "Anode Modification with Fe 2 O 3 Affects the Anode Microbiome and Improves Energy Generation in Microbial Fuel Cells Powered by Wastewater," IJERPH, MDPI, vol. 20(3), pages 1-21, January.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:3:p:2580-:d:1053214
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    References listed on IDEAS

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    1. Dawid Nosek & Agnieszka Cydzik-Kwiatkowska, 2020. "Microbial Structure and Energy Generation in Microbial Fuel Cells Powered with Waste Anaerobic Digestate," Energies, MDPI, vol. 13(18), pages 1-12, September.
    2. Liping Fan & Yaobin Xi, 2021. "Effect of Polypyrrole-Fe 3 O 4 Composite Modified Anode and Its Electrodeposition Time on the Performance of Microbial Fuel Cells," Energies, MDPI, vol. 14(9), pages 1-10, April.
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    4. Dawid Nosek & Piotr Jachimowicz & Agnieszka Cydzik-Kwiatkowska, 2020. "Anode Modification as an Alternative Approach to Improve Electricity Generation in Microbial Fuel Cells," Energies, MDPI, vol. 13(24), pages 1-22, December.
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