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Enhanced oxygen reducing biocathode electroactivity by using sediment extract as inoculum.

Jiali Wu1, Wenshan Chen1, Yuqing Yan1

  • 1MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China.

Bioelectrochemistry (Amsterdam, Netherlands)
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Summary
This summary is machine-generated.

Sediment extract (SE) is a superior inoculum for autotrophic bacteria biocathodes, leading to faster setup and higher power density. SE biocathodes showed enhanced electroactivity due to the enrichment of specific bacterial families like Nitrospirae.

Keywords:
BiocathodeMicrobial communityMicrobial fuel cellsSediment extract

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Area of Science:

  • Microbial electrochemistry
  • Renewable energy catalysis
  • Biotechnology

Background:

  • Autotrophic bacteria offer a sustainable and cost-effective catalytic approach for cathodic oxygen reduction.
  • Biocathode performance is inconsistent across reactors, with inoculum source being a key unknown factor.
  • Understanding inoculum effects is crucial for optimizing biocathode efficiency.

Purpose of the Study:

  • To investigate the impact of different inoculums on biocathode performance and microbial community structure.
  • To compare the efficacy of wastewater (WW), sediment extract (SE), and soil extract (SO) as inoculum sources.
  • To identify specific microbial populations responsible for enhanced electroactivity.

Main Methods:

  • Parallel reactor setup using three distinct inoculum types: WW, SE, and SO.
  • Performance evaluation through power density measurements and cyclic voltammetry (CV).
  • Microbial community analysis using 16S rRNA gene sequencing to assess bacterial populations.

Main Results:

  • SE inoculum resulted in a 17-25% shorter reactor setup time and significantly higher power density compared to SO and WW.
  • SE biocathodes exhibited substantially greater current densities (100±1 A/m³), 150% higher than WW and 67% higher than SO.
  • Community analysis revealed enrichment of Proteobacteria, Bacteroidetes, Firmicutes, and Actinobacteria, with a notable selective growth of Nitrospirae in SE biocathodes.

Conclusions:

  • Sediment extract is a more effective source for acclimating autotrophic electroactive bacteria than soil or wastewater.
  • The selective enrichment of Nitrospirae in SE biocathodes correlates with improved cathodic electroactivity.
  • This study provides valuable insights into biocathode microbiology and inoculum selection for enhanced performance.