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Enhanced nitrogen removal in bio-electrochemical systems by pH control
Authors:Peter Clauwaert  Joachim Desloover  Caitlyn Shea  Rob Nerenberg  Nico Boon  Willy Verstraete
Affiliation:(1) Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, 9000 Ghent, Belgium;(2) Department of Civil Engineering and Geological Science, University of Notre Dame, 154 Fitzpatrick Hall, Notre Dame, IN 46556, USA;
Abstract:Microbial fuel cells can be designed to remove nitrogenous compounds out of wastewater, but their performance is at present limited to 0.33 kg NO3 -Nm−3 net cathode compartment (NCC) d−1. By maintaining the pH in the cathode at 7.2, nitrogen removal was increased from 0.22 to 0.50 kg NO3 -Nm−3 NCC d−1. Bio-electrochemical active microorganisms seem to struggle with the deterioration of their own environment due to slow proton fluxes. Therefore, the results suggest that an appropriate pH adjustment strategy is necessary to allow a sustained and enhanced biological activity in bio-electrochemical systems.
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