Pyrrhotite-Based Constructed Wetland–Microbial Fuel Cell: Reactive Brilliant Red X-3B Removal Performance and Microbial Communities
Publication: Journal of Environmental Engineering
Volume 149, Issue 1
Abstract
The effect of FeS on reactive brilliant red X-3B (RBRX3) removal performance and on the microbial community was investigated in a homemade constructed wetland–microbial fuel cell (CW-MFC) coupled system. Under the test conditions (RBRX3 ; influent glucose concentration ranged from 0 to ), the decolorization rate of RBRX3 and the chemical oxygen demand (COD) in the FeS group were 95.14%–98.86% and 30.53%–86.65%, respectively; these figures were 13.83%–55.52% and 2.57%–19.9% higher, respectively, than those of the gravel group. The output voltage and maximum power density of the FeS group increased by and , respectively, compared to the gravel group. The differences between the two groups mainly occurred in the bottom and anode regions; the FeS filling in these regions played an important role. FeS had an obvious effect on the microbial community structure; Firmicutes and Clostridium in the bottom and anode regions became the dominant species. The conversion of iron and sulfur in FeS between different valence states was achieved under the synergistic action of microorganisms such as iron-reducing bacteria (IRB), sulfate-reducing bacteria (SRB) and sulfur-oxidizing bacteria (SOB), which promoted electron transfer and improved the decolorization and degradation effect of azo dyes and the system’s electricity production performance. FeS added to the CW-MFC system can provide electrons for azo dye wastewater treatment, thereby reducing the addition of organic carbon sources.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
We acknowledge financial support for this work from key projects supported by Science and Technology of Jiangsu Province (BE2016357), the National Science Foundation of China (51209070), and a project founded by the Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions.
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Published In
Journal of Environmental Engineering
Volume 149 • Issue 1 • January 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Mar 28, 2022
Accepted: Sep 8, 2022
Published online: Nov 8, 2022
Published in print: Jan 1, 2023
Discussion open until: Apr 8, 2023
ASCE Technical Topics:
- Bacteria
- Chemical compounds
- Chemical elements
- Chemical processes
- Chemicals
- Chemistry
- Energy engineering
- Energy sources (by type)
- Environmental engineering
- Gravels
- Infrastructure
- Iron compounds
- Microbes
- Organisms
- Oxygen demand
- Pavements
- Pollutants
- Renewable energy
- River engineering
- River systems
- Sulfur
- Transportation engineering
- Water and water resources
- Wetlands (fresh water)
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