Related Experiment Video
Updated: Jun 8, 2026
11:58
Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization
Published on: December 29, 2013
Microbial community differences between propionate-fed microbial fuel cell systems under open and closed circuit
Daniel Aguirre de Cárcer1, Phuc Thi Ha, Jae Kyung Jang
1International Environmental Research Centre, Gwangju Institute of Science and Technology, South Korea.
Applied Microbiology and Biotechnology
|October 6, 2010
Summary
Closed circuit microbial fuel cells (CC-MFCs) show enhanced power output due to specific electrochemically active bacteria, Geobacter spp., enriching the anode. Open circuit (OC) MFCs had different microbial communities, impacting performance.
Area of Science:
- Microbiology
- Electrochemistry
- Environmental Science
Background:
- Microbial fuel cells (MFCs) offer a sustainable energy source.
- Understanding microbial communities is key to optimizing MFC performance.
- Propionate is a common substrate in MFCs.
Purpose of the Study:
- To compare microbial communities and electrochemical performance in closed circuit (CC-MFCs) and open circuit (OC) MFCs.
- To investigate the relationship between microbial community structure and power output.
- To characterize the biofilms on electrodes and membranes.
Main Methods:
- Electrochemical characterization (polarization, power output).
- Microbial community analysis using 16S rRNA gene clone libraries and RFLP.
- Analysis of anode biofilm, cation-exchange membrane, and anodic chamber liquor.
Main Results:
- CC-MFCs exhibited higher power output correlated with specific anodophilic communities.
- CC-MFC anodes were enriched with Geobacter spp. (electrochemically active bacteria).
- OC-MFC anodes were dominated by Bacteroidetes; CC-MFC membranes had low-diversity biofilms (Achromobacter, Azovibrio).
Conclusions:
- Microbial community composition significantly influences MFC power output.
- Geobacter spp. enrichment is crucial for high performance in CC-MFCs.
- Specific microbial consortia develop on electrodes and membranes, impacting cell function.
Related Concept Videos
01:23Microbial Fuel Cells
Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...
01:26Microbes and Methanogenesis
Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
01:30Microbial Wastewater Treatment
Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
01:23Microbial Fermentation
Fermentation is a crucial anaerobic metabolic process that enables microbes to derive energy from sugar without relying on oxygen or an electron transport chain. This process is fundamental to various biological and industrial applications and is classified based on the metabolic products generated.Role of Pyruvate in FermentationPyruvate and its derivatives serve as key electron acceptors in fermentative pathways. The oxidation of NADH to regenerate NAD+ is essential for the continuation of...
01:30Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...