Influence of anode potentials on selection of Geobacter strains in microbial electrolysis cells

Commault, Audrey S.; Lear, Gavin; Packer, Michael A.; Weld, Richard J.

doi:10.1016/j.biortech.2013.04.047

Cited by 87 publications

(76 citation statements)

References 23 publications

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“…All the anode-respiring biofilms presented in this paper were selected in 100 mL MFCs as previously described by Commault et al (2013). The anode potentials were maintained at À0.36 V vs Ag/AgCl (i.e.…”

Section: Anode-respiring Biofilm Growth and Selectionmentioning

confidence: 99%

“…The inocula were referred to as (i) ''Crater Rim'' (CR) a dry soil collected on the hillside of a Banks Peninsula walking track (Canterbury, NZ); (ii) ''Church Bay'' (CB) a wet saline estuary mud (Canterbury, NZ); and (iii) ''Halswell River'' (R) a wet soil from the bed of a freshwater stream (Canterbury, NZ). Once inoculate, the 100 mL MFCs were filled with a minimal medium (pH 7.5) containing 15 mM of acetate (composition described in Commault et al (2013)) previously sparged with nitrogen (<10 ppm of O 2 ) gas for 10 min. The biofilms were left to develop on the constant-voltage anodes for 29 days (66 days for ''Crater Rim'') at room temperature (21°C) without mixing.…”

Section: Anode-respiring Biofilm Growth and Selectionmentioning

confidence: 99%

“…This solution served as the electrolyte for the modification of the previously sandpapered graphite electrode by electrochemical reduction of the diazonium salts using a potentiostat (model EA164 QuadStat). A three-electrode cell configuration was used with an Ag/AgCl, NaCl (3 M) reference electrode (0.28 V vs SHE, BASI Electroanalytical Chemistry, MF-2052) and a second graphite electrode as the counter electrode, as described by Commault et al (2013). Electrochemical reduction of the diazonium salts was achieved by recurrent cyclic voltammetry sweeps starting at zero-current potential (around +0.2 V vs Ag/AgCl) and decreasing to À0.2 V vs Ag/AgCl.…”

Section: Electrode Modification Proceduresmentioning

confidence: 99%

“…Few studies have looked at the effect of inoculum source on the composition of exoelectrogenic biofilms selected in MFCs either with or without fixed anode potentials. To bring more consistency in the results, it is recommended to test inocula in MFCs held at the same fixed potential (e.g., À0.08 V vs SHE), as the anode potential is likely to influence the composition of the anodic biofilm (Commault et al, 2013). The inocula tested in previous studies are typically from rich, moist anaerobic environments likely to contain Geobacter sp.…”

Section: Introductionmentioning

confidence: 99%

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Influence of inoculum and anode surface properties on the selection of Geobacter -dominated biofilms

Commault¹,

Barrière²,

Lapinsonnière³

et al. 2015

Bioresource Technology

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This study evaluated the impact of inoculum source and anode surface modification (carboxylate -COO(-) and sulfonamide -SO2NH2 groups) on the microbial composition of anode-respiring biofilms. These two factors have not previously been considered in detail. Three different inoculum sources were investigated, a dry aerobic soil, brackish estuarine mud and freshwater sediment. The biofilms were selected using a poised anode (-0.36 V vs Ag/AgCl) and acetate as the electron donor in a three-electrode configuration microbial fuel cell (MFC). Population profiling and cloning showed that all biofilms selected were dominated by Geobacter sp., although their electrochemical properties varied depending on the source inoculum and electrode surface modification. These findings suggest that Geobacter sp. are widespread in soils, even those that do not provide a continuously anaerobic environment, and are better at growing in the MFC conditions than other bacteria.

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Section: Anode-respiring Biofilm Growth and Selectionmentioning

confidence: 99%

Section: Anode-respiring Biofilm Growth and Selectionmentioning

confidence: 99%

Section: Electrode Modification Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of inoculum and anode surface properties on the selection of Geobacter -dominated biofilms

Commault¹,

Barrière²,

Lapinsonnière³

et al. 2015

Bioresource Technology

Self Cite

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show abstract

“…33 As a result, different anode potentials had a determining inuence on the selection of the microbial communities used in the MECs. 34 A different initial anode potential, which is determined by the air treatment of the biolm, might determine the selection of facultative aerobes and anaerobes.…”

Section: Anode Potential and Archaea Community Structure Under Differmentioning

confidence: 99%

The effect of a short term biofilm-aeration treatment on energy recovery in microbial electrolysis cells

Liu

et al. 2015

RSC Adv.

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In microbial electrolysis cells (MECs), the hydrogen production yield is often limited by the occurrence of methanogenesis. To reduce methane production, an air treatment process was applied as a costeffective approach, however, the reported method of using air or oxygen sparging may cause an energy loss because of residual dissolved oxygen in the MEC solution. In this study, an air-exposed biofilm was applied to improve H 2 production in single-chamber MECs.Twelve reactors with 0.8 V applied voltage were operated in four batch conditions (three replicates for each): (a) the biofilm was aerated for 10 minutes before the medium was refilled (air speed: 0.8-1 L min À1 ); (b) the biofilm was air-exposed for 10 minutes before the medium was refilled; (c) a fresh medium was used to immediately refill after the reacted medium was discharged; (d) nitrogen gas was sparged for 10 minutes after the fresh medium was refilled (as a control treatment). It was found that the H 2 yield increased by $60% after biofilm aeration under condition (a), and the hydrogen production rate was up to 1.3 mL per mL per reactor d, while little methane was detected. In contrast, under conditions (c) and (d), the maximum production rate of methane was 0.1 mL CH 4 per mL reactor per d, while the production rate of hydrogen decreased to 0.8 mL per mL reactor per d. This work indicated that a short-term aeration treatment could substantially affect energy recovery and methanogen communities located in biofilms.

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Microbial Electrolysis Cells (MECs) as Innovative Technology for Sustainable Hydrogen Production: Fundamentals and Perspective Applications

Kadier

Kalil

Mohamed

et al. 2017

Hydrogen Production Technologies

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Influence of anode potentials on selection of Geobacter strains in microbial electrolysis cells

Cited by 87 publications

References 23 publications

Influence of inoculum and anode surface properties on the selection of Geobacter -dominated biofilms

Influence of inoculum and anode surface properties on the selection of Geobacter -dominated biofilms

The effect of a short term biofilm-aeration treatment on energy recovery in microbial electrolysis cells

Microbial Electrolysis Cells (MECs) as Innovative Technology for Sustainable Hydrogen Production: Fundamentals and Perspective Applications

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