Denitrifying bio-cathodes developed from constructed wetland sediments exhibit electroactive nitrate reducing biofilms dominated by the genera Azoarcus and Pontibacter

To limit the nitrate contamination of ground and surface water, stimulation denitrification by electrochemical approach is an innovative way to be explored. Two reducing bio-cathodes were developed under constant polarization (-0.5 V vs SCE) using sediments water from a constructed wetland (Rampillon, Seine-et-Marne, France). The responded addition on chronoamperometry through increase reductive current. efficiency pilots increased 47% compared negative controls without electrodes after polarization. 16S rRNA gene sequencing biofilms evidenced significant discriminating presence Azoarcus Pontibacter genera in biocathodes active for reduction. Our study shows possibility promote development efficient Azoarcus-dominated freshwater sediment enhance removal waters.