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Applied and Environmental Microbiology, June 2009, p. 3389-3395, Vol. 75, No. 11
0099-2240/09/$08.00+0     doi:10.1128/AEM.02240-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Generation of Electricity and Analysis of Microbial Communities in Wheat Straw Biomass-Powered Microbial Fuel Cells{triangledown}

Yifeng Zhang,1,2 Booki Min,1,{dagger} Liping Huang,2 and Irini Angelidaki*

Department of Environmental Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark,1 Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Department of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, People's Republic of China2

Received 29 September 2008/ Accepted 23 March 2009

Electricity generation from wheat straw hydrolysate and the microbial ecology of electricity-producing microbial communities developed in two-chamber microbial fuel cells (MFCs) were investigated. The power density reached 123 mW/m2 with an initial hydrolysate concentration of 1,000 mg chemical oxygen demand (COD)/liter, while coulombic efficiencies ranged from 37.1 to 15.5%, corresponding to the initial hydrolysate concentrations of 250 to 2,000 mg COD/liter. The suspended bacteria found were different from the bacteria immobilized in the biofilm, and they played different roles in electricity generation from the hydrolysate. The bacteria in the biofilm were consortia with sequences similar to those of Bacteroidetes (40% of sequences), Alphaproteobacteria (20%), Bacillus (20%), Deltaproteobacteria (10%), and Gammaproteobacteria (10%), while the suspended consortia were predominately Bacillus (22.2%). The results of this study can contribute to improving understanding of and optimizing electricity generation in microbial fuel cells.

* Corresponding author. Mailing address: Department of Environmental Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark. Phone: 45 45251429. Fax: 45 45932850. E-mail: ria{at}env.dtu.dk

{triangledown} Published ahead of print on 17 April 2009.

{dagger} Present address: Department of Environmental Science and Engineering, Kyung Hee University, Yongin-si 446-701, Korea.

Applied and Environmental Microbiology, June 2009, p. 3389-3395, Vol. 75, No. 11
0099-2240/09/$08.00+0     doi:10.1128/AEM.02240-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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