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Title (Primary) Extracellular electron transfer of biocathodes: Revealing the potentials for nitrate and nitrite reduction of denitrifying microbiomes dominated by Thiobacillus sp.
Author Pous, N.; Koch, C.; Colprim, J.; Puig, S.; Harnisch, F.;
Journal Electrochemistry Communications
Year 2014
Department UMB;
Volume 49
Language englisch;
POF III (all) T41; R31;
Keywords Autotrophic biological denitrification; Bioelectrochemical system; Cyclic voltammetry; Microbial electrochemical technology; Nitrate reductase; Nitrogen removal
UFZ wide themes RU3;
Abstract The use of biocathodes in bioelectrochemical systems (BES) for the removal of nitrate in wastewater has become a vital field of research. However, the elucidation of the underlying extracellular electron transfer (EET) fundamentals of denitrifying biocathodes is still lacking, but required for a deeper BES understanding and engineering. This study reports for the first time on the thermodynamics of microbial cathodes for nitrate and nitrite reductions using microbial microcosms isolated from a running denitrifying BES. Cyclic voltammetry showed that nitrate and nitrite reduction proceed at − 0.30 V, and − 0.70 V vs. Ag/AgCl, respectively, by surface associated EET sites. The biocathodes were predominantly covered by Thiobacillus sp. contributing with a nitrate reductase (narG) to the major function of the microcosms. In conclusion, the EET characteristics of denitrifying biocathodes are demonstrated for the first time.
ID 15464
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=15464
Pous, N., Koch, C., Colprim, J., Puig, S., Harnisch, F. (2014):
Extracellular electron transfer of biocathodes: Revealing the potentials for nitrate and nitrite reduction of denitrifying microbiomes dominated by Thiobacillus sp.
Electrochem. Commun. 49 , 93 - 97