A multi-electrode continuous flow microbial fuel cell with separator electrode assembly design |
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Authors: | Yongtae?Ahn Email author" target="_blank">Bruce?E?LoganEmail author |
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Institution: | (1) Department of Civil & Environmental Engineering, Penn State University, 212 Sackett Building, University Park, PA 16802, USA; |
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Abstract: | Scaling up microbial fuel cells (MFCs) requires the development of compact reactors with multiple electrodes. A scalable single
chamber MFC (130 mL), with multiple graphite fiber brush anodes and a single air-cathode cathode chamber (27 m2/m3), was designed with a separator electrode assembly (SEA) to minimize electrode spacing. The maximum voltage produced in fed-batch
operation was 0.65 V (1,000 Ω) with a textile separator, compared to only 0.18 V with a glass fiber separator due to short-circuiting
by anode bristles through this separator with the cathode. The maximum power density was 975 mW/m2, with an overall chemical oxygen demand (COD) removal of >90% and a maximum coulombic efficiency (CE) of 53% (50 Ω resistor).
When the reactor was switched to continuous flow operation at a hydraulic retention time (HRT) of 8 h, the cell voltage was
0.21 ± 0.04 V, with a very high CE = 85%. Voltage was reduced to 0.13 ± 0.03 V at a longer HRT = 16 h due to a lower average
COD concentration, and the CE (80%) decreased slightly with increased oxygen intrusion into the reactor per amount of COD
removed. Total internal resistance was 33 Ω, with a solution resistance of 2 Ω. These results show that the SEA type MFC can
produce stable power and a high CE, making it useful for future continuous flow treatment using actual wastewaters. |
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