Skip to Main content Skip to Navigation
Journal articles

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

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

https://hal.inrae.fr/hal-03196902
Contributor : Cédric Midoux <>
Submitted on : Wednesday, May 5, 2021 - 12:26:55 PM
Last modification on : Wednesday, June 2, 2021 - 5:40:03 PM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2021-10-08

Please log in to resquest access to the document

Identifiers

Citation

Timothé Philippon, Jianghao Tian, Chrystelle Bureau, Cédric Chaumont, Cédric Midoux, et al.. Denitrifying bio-cathodes developed from constructed wetland sediments exhibit electroactive nitrate reducing biofilms dominated by the genera Azoarcus and Pontibacter. Bioelectrochemistry, Elsevier, 2021, 140, pp.107819. ⟨10.1016/j.bioelechem.2021.107819⟩. ⟨hal-03196902⟩

Share

Metrics

Record views

109