Litre-scale microbial fuel cells operated in a complete loop |
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Authors: | Peter Clauwaert Schalla Mulenga Peter Aelterman and Willy Verstraete |
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Institution: | (1) Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, 9000 Ghent, Belgium |
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Abstract: | Using the anode effluent to compensate the alkalinization in a bio-cathode has recently been proposed as a way to operate
a microbial fuel cell (MFC) in a continuous and pH neutral way. In this research, we successfully demonstrated that the operation
of a MFC without any pH adjustments is possible by completing the liquid loop over cathode and anode. During the complete
loop operation, a stable current production of 23.2 ± 2.5 A m−3 MFC was obtained, even in the presence of 3.2–5.2 mg O2 L−1 in the anode. The use of current collectors and subdivided electrical circuitries for relative large 2.5-L-scale MFCs resulted
in ohmic cell resistances in the order of 1.4–1.7 mΩ m3 MFC, which were comparable to values of ten times smaller MFCs. Nevertheless, the bio-cathode activity still needs to be
improved significantly with a factor 10–50 in order achieve desirable current densities of 1,000 A m−3 MFC.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Energy recovery Bio-fuel cell Bio-catalysed cathode Bio-electrochemical system Wastewater |
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