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Effect of fed-batch vs. continuous mode of operation on microbial fuel cell performance treating biorefinery wastewater [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
pages 85-94 : digital, PDF file
Additional Creators:
National Renewable Energy Laboratory (U.S.), United States. Department of Energy. Office of Energy Efficiency and Renewable Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Bioelectrochemical systems have been shown to treat low-value biorefinery streams while recovering energy, however, low current densities and anode conversion efficiencies (ACE) limit their application. A bioanode was developed via enrichment of electroactive biofilm under fed-batch and continuous feeding conditions using corn stover-derived waste stream. The continuously-fed MFC exhibited a current density of 5.8 ± 0.06 A/m2 and an ACE of 39% ± 4. The fed-batch MFC achieved a similar current density and an ACE of 19.2%, however, its performance dropped after 36 days of operation to 1.1 A/m2 and 0.5%, respectively. In comparison, the ACE of the continuously-fed MFC remained stable achieving an ACE of 30% ± 3 after 48 days of operation. An MFC treating a biorefinery stream post fuel separation achieved a current density of 10.7 ± 0.1 A/m2 and an ACE of 57% ± 9 at an organic loading of 12.5 g COD/L-day. Characterization of the microbial communities indicate higher abundance of Firmicutes and Proteobacteria and lower abundance of Bacteriodetes and a higher level of Geobacter spp. (1.4% vs. 0.2%) in continuously-fed MFC vs. fed-batch MFC. Finally, the results demonstrate that limiting substrate to the equivalent maximum current that the anode can generate, maintains MFC performance over a long term for high strength wastewaters, such as those generated in the biorefinery.
Report Numbers:
E 1.99:nrel/ja--5100-66631
nrel/ja--5100-66631
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Note:
Published through SciTech Connect.
05/02/2016.
"nrel/ja--5100-66631"
Biochemical Engineering Journal 116 ISSN 1369-703X AM
Tyler C. Pannell; R. Kannaiah Goud; Daniel J. Schell; Abhijeet P. Borole.
Funding Information:
AC36-08GO28308
View MARC record | catkey: 23502253