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Efficient enriching high-performance denitrifiers using bio-cathode of microbial fuel cells.
Ruitao Li1, Xiang-Peng Ren1, Xinxin Fan1
1Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, No. 22 Xinong Road, Yangling, Shaanxi Province 712100, China.
Iscience
|October 22, 2024
Summary
This study developed a bio-cathode microbial fuel cell (MFC) for wastewater treatment, achieving high nitrate removal. The method efficiently enriches denitrifiers for sustainable water management.
Area of Science:
- Environmental Science
- Microbiology
- Electrochemistry
Background:
- Microbial fuel cells (MFCs) show promise for eco-friendly wastewater treatment.
- Bio-cathode denitrification is an emerging technology for nitrate removal.
Purpose of the Study:
- To enrich a mixed bio-cathode denitrifying culture (MBD) using an efficient repeated replacement method.
- To evaluate the performance of the MBD in a bio-cathode MFC for wastewater denitrification.
- To identify key microbial players and assess the potential of isolated strains for enhanced denitrification.
Main Methods:
- Utilized a repeated replacement method to enrich MBD in a bio-cathode MFC.
- Measured MFC output voltage and nitrate-nitrogen removal efficiency.
- Conducted microbial community analysis to identify dominant bacteria.
- Isolated and tested a specific strain (Lyy) for denitrification efficiency under varying conditions.
Main Results:
- Achieved a stable maximum output voltage of 120 ± 5 mV.
- Reached a nitrate-nitrogen removal efficiency of 69.99 ± 0.60%.
- Identified Proteobacteria as the predominant phylum, with Paracoccus and Pseudomonas as key genera.
- Isolated strain Lyy (Stutzerimonas) achieved >98% denitrification efficiency across broad C/N ratios and nitrate concentrations.
Conclusions:
- The repeated replacement method is effective for enriching bio-cathode denitrifiers.
- Bio-cathode MFCs with enriched MBD show significant potential for sustainable wastewater treatment.
- Specific microbial strains like Lyy offer high denitrification capabilities for targeted applications.
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