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Title: Effect of fed-batch vs. continuous mode of operation on microbial fuel cell performance treating biorefinery wastewater

Journal Article · · Biochemical Engineering Journal
 [1];  [1];  [2];  [3]
  1. The Univ. of Tennessee, Knoxville, TN (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. The Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office; Work for Others (WFO); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC36-08GO28308; AC05-00OR22725
OSTI ID:
1332910
Alternate ID(s):
OSTI ID: 1263833; OSTI ID: 1410819
Report Number(s):
NREL/JA-5100-66631
Journal Information:
Biochemical Engineering Journal, Vol. 116; ISSN 1369-703X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Cited By (4)

Storing of exoelectrogenic anolyte for efficient microbial fuel cell recovery text January 2018
Concentration Pulse Method for the Investigation of Transformation Pathways in a Glycerol-Fed Bioelectrochemical System journal November 2018
Storing of exoelectrogenic anolyte for efficient microbial fuel cell recovery text January 2018
Storing of exoelectrogenic anolyte for efficient microbial fuel cell recovery journal January 2018

Figures / Tables (8)