Fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogen

Microbial Electrochemical Fluidized Bed Reactors (ME-FBR) represent a new concept for promoting proper bacteria-electrode interaction and eventually efficient biocatalysis in Microbial Electrochemical Technologies (METs). In the current work we demonstrate how a fluidized cathode, a dynamic and disc...

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Main Authors: Tejedor-Sanz Sara, Fernández-Labrador Patricia, Manchón Carlos, Esteve-Núñez Abraham
Format: Article
Language:English
Published: Elsevier 2020-07-01
Series:Electrochemistry Communications
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S1388248120301107
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spelling doaj-277ff2ad6e8c4e5b94d4add6d35817b12020-11-25T02:36:54ZengElsevierElectrochemistry Communications1388-24812020-07-01116106759Fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogenTejedor-Sanz Sara0Fernández-Labrador Patricia1Manchón Carlos2Esteve-Núñez Abraham3University of Alcalá, Department of Chemical Engineering, Ctra.Madrid-Barcelona, Km. 33,6, 28871, Alcalá de Henares, Madrid, Spain; IMDEA Water Institute, Av. Punto Com, 2, 28805 Alcalá de Henares, Madrid, Spain; Corresponding authors at: University of Alcalá, Department of Chemical Engineering, Ctra.Madrid-Barcelona, Km. 33,6, 28871, Alcalá de Henares, Madrid, Spain.University of Alcalá, Department of Chemical Engineering, Ctra.Madrid-Barcelona, Km. 33,6, 28871, Alcalá de Henares, Madrid, SpainUniversity of Alcalá, Department of Chemical Engineering, Ctra.Madrid-Barcelona, Km. 33,6, 28871, Alcalá de Henares, Madrid, SpainUniversity of Alcalá, Department of Chemical Engineering, Ctra.Madrid-Barcelona, Km. 33,6, 28871, Alcalá de Henares, Madrid, Spain; IMDEA Water Institute, Av. Punto Com, 2, 28805 Alcalá de Henares, Madrid, Spain; Corresponding authors at: University of Alcalá, Department of Chemical Engineering, Ctra.Madrid-Barcelona, Km. 33,6, 28871, Alcalá de Henares, Madrid, Spain.Microbial Electrochemical Fluidized Bed Reactors (ME-FBR) represent a new concept for promoting proper bacteria-electrode interaction and eventually efficient biocatalysis in Microbial Electrochemical Technologies (METs). In the current work we demonstrate how a fluidized cathode, a dynamic and discontinuous design of electrode, can be an effective electron donor for electroactive hydrogen-generating and nitrate reducing bacteria. Furthermore, the oxygen produced in the anodic reaction promoted ammonium oxidation to nitrate by nitrifying bacteria thus expanding the environmental applications of the system. By coupling both anodic and cathodic reactions, it was possible to simultaneously achieve nitrification–denitrification within one chamber and without external oxygen addition. Our proof-of-concept revealed the removal of 98% ammonium and ca. 29% of total nitrogen (31 g-N m−3reactor d−1) from an effluent with low organic matter under continuous mode. This study reveals for first time how fluidized beds can be integrated in METs not only as anodes but also as cathodes, broadening the opportunities and applications to bioremediation and bioelectrosynthesis processes.http://www.sciencedirect.com/science/article/pii/S1388248120301107Fluidized bed electrodesMicrobial electrochemistryFluidized cathodeNitrogen removalMETs
collection DOAJ
language English
format Article
sources DOAJ
author Tejedor-Sanz Sara
Fernández-Labrador Patricia
Manchón Carlos
Esteve-Núñez Abraham
spellingShingle Tejedor-Sanz Sara
Fernández-Labrador Patricia
Manchón Carlos
Esteve-Núñez Abraham
Fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogen
Electrochemistry Communications
Fluidized bed electrodes
Microbial electrochemistry
Fluidized cathode
Nitrogen removal
METs
author_facet Tejedor-Sanz Sara
Fernández-Labrador Patricia
Manchón Carlos
Esteve-Núñez Abraham
author_sort Tejedor-Sanz Sara
title Fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogen
title_short Fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogen
title_full Fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogen
title_fullStr Fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogen
title_full_unstemmed Fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogen
title_sort fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogen
publisher Elsevier
series Electrochemistry Communications
issn 1388-2481
publishDate 2020-07-01
description Microbial Electrochemical Fluidized Bed Reactors (ME-FBR) represent a new concept for promoting proper bacteria-electrode interaction and eventually efficient biocatalysis in Microbial Electrochemical Technologies (METs). In the current work we demonstrate how a fluidized cathode, a dynamic and discontinuous design of electrode, can be an effective electron donor for electroactive hydrogen-generating and nitrate reducing bacteria. Furthermore, the oxygen produced in the anodic reaction promoted ammonium oxidation to nitrate by nitrifying bacteria thus expanding the environmental applications of the system. By coupling both anodic and cathodic reactions, it was possible to simultaneously achieve nitrification–denitrification within one chamber and without external oxygen addition. Our proof-of-concept revealed the removal of 98% ammonium and ca. 29% of total nitrogen (31 g-N m−3reactor d−1) from an effluent with low organic matter under continuous mode. This study reveals for first time how fluidized beds can be integrated in METs not only as anodes but also as cathodes, broadening the opportunities and applications to bioremediation and bioelectrosynthesis processes.
topic Fluidized bed electrodes
Microbial electrochemistry
Fluidized cathode
Nitrogen removal
METs
url http://www.sciencedirect.com/science/article/pii/S1388248120301107
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AT manchoncarlos fluidizedbedcathodesassuitableelectrondonorsforbacteriatoremovenitrogenandproducebiohydrogen
AT estevenunezabraham fluidizedbedcathodesassuitableelectrondonorsforbacteriatoremovenitrogenandproducebiohydrogen
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