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Manchester, CT, United States

Karra U.,University of Connecticut | Troop E.,Fuss and oNeill Inc. | Curtis M.,Simplified Energy Solutions | Scheible K.,HDR | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2013

Two flow patterns (plug flow (PF) and complete mixing (CM)) of microbial fuel cells (MFCs) with multiple anodes-cathodes were compared in continuous flow mode for wastewater treatment and power generation. The results indicated that PF-MFCs had higher power generation and columbic efficiency (CE) than CM-MFCs, and the power generation varied along with the flow pathway in the PF-MFCs. The gradient of substrate concentrations along the PF-MFCs was the driving force for the power generation. In contrast, the CM-MFCs had higher wastewater removal efficiency than PF-MFCs, but had lower power conversion efficiency and power generation. This work demonstrated that MFC configuration is a key factor for enhancing power generation and wastewater treatment. Crown Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source


Jiang D.,University of Connecticut | Raymond D.,University of Connecticut | Li B.,University of Connecticut | Troop E.,Fuss and oNeill Inc.
Journal of New England Water Environment Association | Year: 2010

The lack of effective large-scale design and inexpensive electrode materials has limited the real-world application of microbial fuel cells (MFC). This paper aims to address these problems by developing a multi-anode/cathode MFC and MnO2 (OMS-2) cathodes. The results demonstrated that the multi-anode/cathode MFC substantially increased the total power production of MFC since the average power density per anode/cathode channel did not significantly change when the MFC was operating with 12 and four channels (575 mW/m2 vs. 635 mW/m2) at an organic loading rate of 0.5 kg/m3/day. The power density increased from 300 to 380 mW/m 2 as the organic loading rate increased from 0.19 to 0.66 kg/m 3/day. MFCs achieved 80 percent of COD removal at HRT of 20 hours while the COD removal at HRT of five hours was 66 percent and fluctuated greatly with the shock In influent COD. MnO2 cathodes produced power density as high as Pt cathodes. A decrease in the power density (from 400 mW/m 2 to 150 mW/m2) and an increase in Rin of MFCs (175 to 225Ω) was observed due to the cathode fouling. Analysis revealed that the interior fouling was mainly caused by calcium precipitation (89 percent), and the exterior fouling was mainly caused by diffusion of sodium (83 percent) through the cathodes. Source


Jiang D.,University of Connecticut | Curtis M.,Fuss and oNeill Inc. | Troop E.,Fuss and oNeill Inc. | Scheible K.,Hydroqual Inc | And 5 more authors.
International Journal of Hydrogen Energy | Year: 2011

A new type of microbial fuel cell (MFC), multi-anode/cathode MFC (termed as MAC MFC) containing 12 anodes/cathodes were developed to harvest electric power treating domestic wastewater. The power density of MAC MFCs increased from 300 to 380 mW/m2 at the range of the organic loading rates (0.19-0.66 kg/m3/day). MAC MFCs achieved 80% of contaminant removal at the hydraulic retention time (HRT) of 20 h but the contaminant removal deceased to 66% at the HRT of 5 h. In addition, metal-doped manganese dioxide (MnO 2) cathodes were developed to replace the costly platinum cathodes, and exhibited high power density. Cu-MnO2 cathodes produced 465 mW/m2 and Co-MnO2 cathodes produced 500 mW/m2. Due to the cathode fouling of the precipitation of calcium and sodium, a decrease in the power density (from 400 to 150 mW/m2) and an increase in internal resistance (Rin) (from 175 to 225 ) were observed in MAC MFCs. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved. Source

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