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Biogas utilization without desulfurization pretreatment in a bioelectrochemical system
Zexiang Xie1, Zhixin Jin1, Shaohui Zhang2
1School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China.
The Science of the Total Environment
|February 16, 2023
Summary
This study explores using biogas directly in bioelectrochemical systems (BES) without prior desulfurization. Results show hydrogen sulfide enhances methane consumption and electricity generation, offering a novel biogas utilization method.
Area of Science:
- Environmental Science
- Electrochemistry
- Microbiology
Background:
- Biogas utilization typically requires hydrogen sulfide removal.
- Bioelectrochemical systems (BES) offer potential for biogas conversion.
Purpose of the Study:
- To investigate biogas utilization in a BES without desulfurization pretreatment.
- To assess the impact of hydrogen sulfide on methane consumption and electricity generation.
Main Methods:
- Startup of a biogas-fueled BES.
- Optimization of performance using bicarbonate buffer and temperature control.
- Analysis of microbial communities and metagenomics.
Main Results:
- Successful startup of the BES within 36 days.
- Hydrogen sulfide promoted methane consumption and electricity generation.
- Optimal performance achieved at 40 °C with bicarbonate buffer, yielding a maximum power density of 2.070 W/m³.
- Identification of dominant bacteria (Sulfurivermis, Ignavibacteriales, Lentimicrobium) and archaea (Methanobacterium, Methanosarcina, Methanothrix).
- Metagenomics revealed a link between anaerobic methane oxidation, electricity generation, and sulfur metabolism.
Conclusions:
- Biogas can be utilized directly in BES without desulfurization.
- Hydrogen sulfide plays a crucial role in enhancing the process.
- This approach presents a novel pathway for efficient biogas valorization.
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