Pre-acclimation of a wastewater inoculum to cellulose in an aqueous–cathode MEC improves power generation in air–cathode MFCs
KAUST Grant NumberKUS-I1-003-13
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AbstractCellulose has been used in two-chamber microbial fuel cells (MFCs), but power densities were low. Higher power densities can be achieved in air-cathode MFCs using an inoculum from a two-chamber, aqueous-cathode microbial electrolysis cell (MEC). Air-cathode MFCs with this inoculum produced maximum power densities of 1070mWm-2 (cathode surface area) in single-chamber and 880mWm-2 in two-chamber MFCs. Coulombic efficiencies ranged from 25% to 50%, and COD removals were 50-70% based on total cellulose removals of 60-80%. Decreasing the reactor volume from 26 to 14mL (while maintaining constant electrode spacing) decreased power output by 66% (from 526 to 180mWm-2) due to a reduction in total mass of cellulose added. These results demonstrate that air-cathode MFCs can produce high power densities with cellulose following proper acclimation of the inoculum, and that organic loading rates are important for maximizing power densities from particulate substrates. © 2010 Elsevier Ltd.
CitationCheng S, Kiely P, Logan BE (2011) Pre-acclimation of a wastewater inoculum to cellulose in an aqueous–cathode MEC improves power generation in air–cathode MFCs. Bioresource Technology 102: 367–371. Available: http://dx.doi.org/10.1016/j.biortech.2010.05.083.
SponsorsThe authors thank D.W. Jones for help with the analytical measurements. This research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST).
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