Journal
BIORESOURCE TECHNOLOGY
Volume 179, Issue -, Pages 26-34Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.11.106
Keywords
Microbial fuel cell; Bufferless; Anolyte recirculation; Proton transfer; Oxygen transfer
Funding
- National Natural and Science Foundation of China [51176212, 51136007]
- Program for New Century Excellent Talents of University in China [NCET-11-0551]
- Study Abroad Program of Tang Lixin Scholarship in Chongqing University
- U.S. Army Research Office [W911NF-11-1-0531]
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Two identical microbial fuel cells (MFCs) with a floating air-cathode were operated under either buffered (MFC-B) or bufferless (MFC-BL) conditions to investigate anolyte recirculation effects on enhancing proton transfer. With an external resistance of 50 X and recirculation rate of 1.0 ml/min, MFC-BL had a 27% lower voltage (9.7% lower maximal power density) but a 64% higher Coulombic efficiency (CE) than MFC-B. MFC-B had a decreased voltage output, batch time, and CE with increasing recirculation rate resulting from more oxygen transfer into the anode. However, increasing the recirculation rate within a low range significantly enhanced proton transfer in MFC-BL, resulting in a higher voltage output, a longer batch time, and a higher CE. A further increase in recirculation rate decreased the batch time and CE of MFC-BL due to excess oxygen transfer into anode outweighing the proton-transfer benefits. The unbuffered MFC had an optimal recirculation rate of 0.35 ml/min. (C) 2014 Elsevier Ltd. All rights reserved.
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