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Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization
Published on: December 29, 2013
Factors affecting current production in microbial fuel cells using different industrial wastewaters
S B Velasquez-Orta1, I M Head, T P Curtis
1School of Chemical Engineering and Advanced Materials, Newcastle University, Newcastle Upon Tyne NE1 7RU, United Kingdom.
Bioresource Technology
|February 25, 2011
Summary
Microbial fuel cells (MFCs) using paper wastewater achieved significantly higher current densities than other industrial wastewaters. This performance was linked to specific microbial activity and electron transfer in the anode biofilms.
Area of Science:
- Environmental Science
- Electrochemistry
- Microbiology
Background:
- Microbial fuel cells (MFCs) offer a sustainable method for wastewater treatment and energy generation.
- The type of industrial wastewater significantly impacts MFC performance and microbial community structure.
Purpose of the Study:
- To evaluate the effect of different industrial wastewaters (bakery, brewery, paper, dairy) on MFC performance.
- To analyze the microbial composition and electrochemical properties of MFC anodes under various wastewater conditions.
Main Methods:
- Comparative analysis of MFCs fed with distinct industrial wastewaters.
- Assessment of current density, microbial community profiling of anodic biofilms, and electrochemical analysis (redox activity).
Main Results:
- MFCs with paper wastewater exhibited the highest current density (125 ± 2 mA/m²), exceeding other wastewaters by at least fivefold.
- Anodic biofilms differed based on wastewater type; paper wastewater MFCs showed unique redox activity (-134 ± 5 mV vs NHE).
- Electron shuttling compounds produced by bacteria in paper wastewater MFCs enhanced electron transfer rates.
Conclusions:
- Paper wastewater significantly enhances MFC performance, independent of substrate degradability.
- Specific microbial communities and their electrochemical activity, including electron shuttling, are key drivers of high MFC performance.
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