AustralieFrV1, Main, Exploration, bibRecord, 000389

Selective cathodic microbial biofilm retention allows a high current-to-sulfide efficiency in sulfate-reducing microbial electrolysis cells.

Identifieur interne : 000389 ( Main/Exploration ); précédent : 000388; suivant : 000390

Selective cathodic microbial biofilm retention allows a high current-to-sulfide efficiency in sulfate-reducing microbial electrolysis cells.

Auteurs : Guillermo Pozo [Australie] ; Yang Lu [Australie] ; Sebastien Pongy [France] ; Jürg Keller [Australie] ; Pablo Ledezma [Australie] ; Stefano Freguia [Australie]

Source :

Bioelectrochemistry (Amsterdam, Netherlands) [ 1878-562X ] ; 2017.

RBID : pubmed:28719849

Descripteurs français

KwdFr :
- Bactéries (métabolisme), Biofilms, Concentration en ions d'hydrogène, Conductivité électrique, Nanotubes de carbone (), Sulfates (), Sulfates (métabolisme), Sulfures (), Sulfures (métabolisme), Électrodes, Électrolyse (instrumentation).
MESH :
- métabolisme : Bactéries, Sulfates, Sulfures.
- Biofilms, Concentration en ions d'hydrogène, Conductivité électrique, Nanotubes de carbone, Sulfates, Sulfures, Électrodes, Électrolyse.

English descriptors

KwdEn :
- Bacteria (metabolism), Biofilms, Electric Conductivity, Electrodes, Electrolysis (instrumentation), Hydrogen-Ion Concentration, Nanotubes, Carbon (chemistry), Sulfates (chemistry), Sulfates (metabolism), Sulfides (chemistry), Sulfides (metabolism).
MESH :
- chemical , chemistry : Nanotubes, Carbon, Sulfates, Sulfides.
- instrumentation : Electrolysis.
- metabolism : Bacteria, Sulfates, Sulfides.
- Biofilms, Electric Conductivity, Electrodes, Hydrogen-Ion Concentration.

Abstract

Selective microbial retention is of paramount importance for the long-term performance of cathodic sulfate reduction in microbial electrolysis cells (MECs) due to the slow growth rate of autotrophic sulfate-reducing bacteria. In this work, we investigate the biofilm retention and current-to-sulfide conversion efficiency using carbon granules (CG) or multi-wall carbon nanotubes deposited on reticulated vitreous carbon (MWCNT-RVC) as electrode materials. For ~2months, the MECs were operated at sulfate loading rates of 21 to 309gSO4 -S/m(2)/d. Although MWCNT-RVC achieved a current density of 57±11A/m(2), greater than the 32±9A/m(2) observed using CG, both materials exhibited similar sulfate reduction rates (SRR), with MWCNT-RVC reaching 104±16gSO4 -S/m(2)/d while 110±13gSO4 -S/m(2)/d were achieved with CG. Pyrosequencing analysis of the 16S rRNA at the end of experimentation revealed a core community dominated by Desulfovibrio (28%), Methanobacterium (19%) and Desulfomicrobium (14%), on the MWCNT-RVC electrodes. While a similar Desulfovibrio relative abundance of 29% was found in CG-biofilms, Desulfomicrobium was found to be significantly less abundant (4%) and Methanobacterium practically absent (0.2%) on CG electrodes. Surprisingly, our results show that CG can achieve higher current-to-sulfide efficiencies at lower power consumption than the nano-modified three-dimensional MWCNT-RVC.

DOI: 10.1016/j.bioelechem.2017.07.001
PubMed: 28719849

Affiliations:

Australie, France

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<front><div type="abstract" xml:lang="en">Selective microbial retention is of paramount importance for the long-term performance of cathodic sulfate reduction in microbial electrolysis cells (MECs) due to the slow growth rate of autotrophic sulfate-reducing bacteria. In this work, we investigate the biofilm retention and current-to-sulfide conversion efficiency using carbon granules (CG) or multi-wall carbon nanotubes deposited on reticulated vitreous carbon (MWCNT-RVC) as electrode materials. For ~2months, the MECs were operated at sulfate loading rates of 21 to 309gSO4 -S/m(2)/d. Although MWCNT-RVC achieved a current density of 57±11A/m(2), greater than the 32±9A/m(2) observed using CG, both materials exhibited similar sulfate reduction rates (SRR), with MWCNT-RVC reaching 104±16gSO4 -S/m(2)/d while 110±13gSO4 -S/m(2)/d were achieved with CG. Pyrosequencing analysis of the 16S rRNA at the end of experimentation revealed a core community dominated by Desulfovibrio (28%), Methanobacterium (19%) and Desulfomicrobium (14%), on the MWCNT-RVC electrodes. While a similar Desulfovibrio relative abundance of 29% was found in CG-biofilms, Desulfomicrobium was found to be significantly less abundant (4%) and Methanobacterium practically absent (0.2%) on CG electrodes. Surprisingly, our results show that CG can achieve higher current-to-sulfide efficiencies at lower power consumption than the nano-modified three-dimensional MWCNT-RVC.</div>
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Selective cathodic microbial biofilm retention allows a high current-to-sulfide efficiency in sulfate-reducing microbial electrolysis cells.

Selective cathodic microbial biofilm retention allows a high current-to-sulfide efficiency in sulfate-reducing microbial electrolysis cells.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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