Effect of start-up strategies with functionally redundant and efficient acetoclastic electroactive bacteria on the performance of microbial electrolysis cells fed with domestic wastewater

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Abstract

Different start-up strategies were investigated for enriching efficient acetoclastic electroactive bacteria (EAB) in wastewater-fed microbial electrolysis cells (MECs). Wastewater-fed MECs bioaugmented (B-MECs) at time zero with pure cultures of Geobacter sulfurreducens and Desulfuromonas acetexigens or pre-enriched anode biofilm (PEA-MECs) with G. sulfurreducens and D. acetexigens performed better than wastewater-fed MECs started with wastewater (WW-MECs) as the sole inoculum. The highest peak current (1575 ± 157 mA/m2), coulombic efficiency (70.3 ± 9 %), and CH4 production (0.27 ± 0.02 L/g-COD) was observed in PEA-MECs. The relative abundance of acetoclastic EAB was influenced by start-up strategies (Geobacter: 23.9 ± 2.6 % and Desulfuromonas: 13.7 ± 6 % for B-MECs; Geobacter: 29.6 % ± 5.1 % and Desulfuromonas: 0.45 ± 0.2 % for PEA-MECs; Geobacter: 7.9 ± 0.5 % for WW-MECs). These results provide a novel insight for enriching the anode with functionally redundant and efficient acetoclastic EAB, which is crucial for resource recovery from wastewater.

Original languageEnglish (US)
Article number101323
JournalBioresource Technology Reports
Volume21
DOIs
StatePublished - Feb 2023

Bibliographical note

Funding Information:
This work was supported by Center Competitive Funding Program ( FCC/1/1971-33-01 ) awarded to Pascal E. Saikaly from King Abdullah University of Science and Technology (KAUST) .

Publisher Copyright:
© 2022

Keywords

  • Bioaugmentation
  • Desulfuromonas acetexigens
  • Functional redundancy
  • Geobacter sulfurreducens
  • Microbial electrolysis cell

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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