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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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 |
work_keys_str_mv |
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