scholarly journals Improving the extracellular electron transfer of Shewanella oneidensis MR-1 for enhanced bioelectricity production from biomass hydrolysate

RSC Advances ◽  
2017 ◽  
Vol 7 (48) ◽  
pp. 30488-30494 ◽  
Author(s):  
Yan-Zhai Wang ◽  
Yu Shen ◽  
Lu Gao ◽  
Zhi-Hong Liao ◽  
Jian-Zhong Sun ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Shewanella Oneidensis ◽  
Electricity Production ◽  
Extracellular Electron Transfer ◽  
Great Promise ◽  
Biomass Hydrolysate

Direct electricity production from biomass hydrolysate by microbial fuel cells (MFC) holds great promise for the development of the sustainable biomass industry.

Shewanella oneidensis MR-1 Msh pilin proteins are involved in extracellular electron transfer in microbial fuel cells

2012 ◽  
Vol 47 (1) ◽  
pp. 170-174 ◽  
Author(s):  
Lisa A. Fitzgerald ◽  
Emily R. Petersen ◽  
Richard I. Ray ◽  
Brenda J. Little ◽  
Candace J. Cooper ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Shewanella Oneidensis ◽  
Extracellular Electron Transfer

Riboflavin-shuttled extracellular electron transfer from Enterococcus faecalis to electrodes in microbial fuel cells

2014 ◽  
Vol 60 (11) ◽  
pp. 753-759 ◽  
Author(s):  
Enren Zhang ◽  
Yamin Cai ◽  
Yue Luo ◽  
Zhe Piao
Keyword(s):  
Electron Transfer ◽  
Fuel Cells ◽  
Enterococcus Faecalis ◽  
Microbial Fuel Cells ◽  
Electricity Production ◽  
Extracellular Electron Transfer ◽  
Gram Negative Bacteria ◽  
Positive Bacterium ◽  
Electron Mediators ◽  
Oxidation Of Glucose

Great attention has been focused on Gram-negative bacteria in the application of microbial fuel cells. In this study, the Gram-positive bacterium Enterococcus faecalis was employed in microbial fuel cells. Bacterial biofilms formed by E. faecalis ZER6 were investigated with respect to electricity production through the riboflavin-shuttled extracellular electron transfer. Trace riboflavin was shown to be essential for transferring electrons derived from the oxidation of glucose outside the peptidoglycan layer in the cell wall of E. faecalis biofilms formed on the surface of electrodes, in the absence of other potential electron mediators (e.g., yeast extract).

scholarly journals Taxonomic and functional metagenomic analysis of anodic communities in two pilot-scale microbial fuel cells treating different industrial wastewaters

2015 ◽  
Vol 12 (3) ◽  
pp. 1-15 ◽  
Author(s):  
Larisa Kiseleva ◽  
Sofya K. Garushyants ◽  
Hongwu Ma ◽  
David J.W. Simpson ◽  
Viatcheslav Fedorovich ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Wastewater Treatment ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Pilot Scale ◽  
Metagenomic Analysis ◽  
Anode Surface ◽  
Extracellular Electron Transfer ◽  
Climatic Zones ◽  
Electrochemically Active

Summary The combined processes of microbial biodegradation accompanied by extracellular electron transfer make microbial fuel cells (MFCs) a promising new technology for cost-effective and sustainable wastewater treatment. Although a number of microbial species that build biofilms on the anode surfaces of operating MFCs have been identified, studies on the metagenomics of entire electrogenic communities are limited. Here we present the results of wholegenome metagenomic analysis of electrochemically active robust anodic microbial communities, and their anaerobic digester (AD) sludge inocula, from two pilot-scale MFC bioreactors fed with different distillery wastewaters operated under ambient conditions in distinct climatic zones. Taxonomic analysis showed that Proteobacteria, Bacteroidetes and Firmicutes were abundant in AD sludge from distinct climatic zones, and constituted the dominant core of the MFC microbiomes. Functional analysis revealed species involved in degradation of organic compounds commonly present in food industry wastewaters. Also, accumulation of methanogenic Archaea was observed in the electrogenic biofilms, suggesting a possibility for simultaneous electricity and biogas recovery from one integrated wastewater treatment system. Finally, we found a range of species within the anode communities possessing the capacity for extracellular electron transfer, both via direct contact and electron shuttles, and show differential distribution of bacterial groups on the carbon cloth and activated carbon granules of the anode surface. Overall, this study provides insights into structural shifts that occur in the transition from an AD sludge to an MFC microbial community and the metabolic potential of electrochemically active microbial populations with wastewater-treating MFCs.

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