期刊
BIORESOURCE TECHNOLOGY
卷 102, 期 8, 页码 5098-5104出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.01.045
关键词
Microbial fuel cell; Shear flow; Biofilm-forming; Direct electron transfer; Electro-active
资金
- Oak Ridge National Laboratory (ORNL)
- UT-Battelle, Inc. [DE-AC05-000R22725]
Using a pre-enriched microbial consortium as the inoculum and continuous supply of carbon source, improvement in performance of a three-dimensional, flow-through MFC anode utilizing ferricyanide cathode was investigated. The power density increased from 170 W/m(3) (1800 mW/m(2)) to 580 W/m(3) (6130 mW/m(2)), when the carbon loading increased from 2.5 g/1-day to 50 g/1-day. The coulombic efficiency (CE) decreased from 90% to 23% with increasing carbon loading. The CEs are among the highest reported for glucose and lactate as the substrate with the maximum current density reaching 15.1 A/m(2). This suggests establishment of a very high performance exoelectrogenic microbial consortium at the anode. A maximum energy conversion efficiency of 54% was observed at a loading of 2.5 g/1-day. Biological characterization of the consortium showed presence of Burkholderiales and Rhodocyclales as the dominant members. Imaging of the biofilms revealed thinner biofilms compared to the inoculum MFC, but a 1.9-fold higher power density. (C) 2011 Elsevier Ltd. All rights reserved.
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