Possibilities for extremophilic microorganisms in microbial electrochemical systems

Dopson, Mark; Ni, Gaofeng; Sleutels, Tom

doi:10.1093/femsre/fuv044

Cited by 102 publications

(58 citation statements)

References 158 publications

(199 reference statements)

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“…Furthermore, it may be favourable to decrease the micro-pillar width to a few tens of micrometres, or less if technologically possible, with the objective to induce ultramicroelectrode effect, which has been shown to positively impact the current produced by the biofilms that form around electrodes of such dimension [57]. Obviously, in the context of well-controlled conditions, promising ways to improve the interfacial performance would be to find acidophilic electroactive strains, but they remain rare and not really efficient [58]. Increasing the concentration of the buffer species by acclimating electroactive species to high buffer concentrations may be another promising way to progress on bioanode performance.…”

Section: Inefficient Lower Part Because Of Acidificaɵonmentioning

confidence: 99%

Effect of surface roughness, porosity and roughened micro-pillar structures on the early formation of microbial anodes

Champigneux

Renault-Sentenac

Bourrier

et al. 2019

Bioelectrochemistry

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The early formation of electroactive biofilms was investigated with gold electrodes inoculated with Geobacter sulfurreducens. Biofilms were formed under an applied potential of 0.1 V/SCE, with a single batch of acetate 10 mM, on flat gold electrodes with different random surface roughness. Roughness with arithmetical mean height (S a) ranging from 0.5 to 6.7 μm decreased the initial latency time, and increased the current density by a factor of 2.7 to 6.7 with respect to nano-rough electrodes (S a = 4.5 nm). The current density increased linearly with S a up to 14.0 A•m −2 for S a of 6.7 μm. This linear relationship remained valid for porous gold. In this case, the biofilm rapidly formed a uniform layer over the pores, so porosity impacted the current only by modifying the roughness of the upper surface. The current density thus reached 14.8 ± 1.1 A•m −2 with S a of 7.6 μm (7 times higher than the nano-rough electrodes). Arrays of 500-μm-high micro-pillars were roughened following the same protocol. In this case, roughening resulted in a modest gain around 1.3-fold. A numerical model showed that the modest enhancement was due to ion transport not being sufficient to mitigate the local acidification of the structure bottom.

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Section: Inefficient Lower Part Because Of Acidificaɵonmentioning

confidence: 99%

Effect of surface roughness, porosity and roughened micro-pillar structures on the early formation of microbial anodes

Champigneux

Renault-Sentenac

Bourrier

et al. 2019

Bioelectrochemistry

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“…Besides the two examples, there are also Pseudomonas aeruginosa, Enterococcus faecalis, Rhodoferax ferrireducens, Geothrix fermentans, Shewanella species, Geobacter species, Clostridium species, and sulfatereducing bacteria. The possibility of utilizing extremophilic microorganisms is also being studied [49], and to add a new perspective to power generation by MFCs, the utilization of photosynthetic bacteria at the anode is also examined [40]. One of the advantages of these MFCs is the elimination of carbon dioxide released into the atmosphere.…”

Section: Various Microbial Catalystsmentioning

confidence: 99%

“…Extremophiles can be used to oxidize sulfur compounds in acidic pH to remediate wastewaters and generate electrical energy from marine sediment microbial fuel cells at low temperatures. The MFC performance of these extremophilic microorganisms has been well summarized in several review papers [49,64]. In this section, the recent advances of MFCs using extremophilic microorganisms as catalysts are briefly introduced and discussed.…”

Section: Extremophilic Microorganismsmentioning

confidence: 99%

Catalyst Development of Microbial Fuel Cells for Renewable-Energy Production

Azuma¹,

Ojima²

2019

Current Topics in Biochemical Engineering

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In this chapter, we focus on microbial fuel cells (MFCs) that convert the energy from organic matters into electrical energy using microorganisms. MFCs are greatly expected to be used as a relatively low-cost and safe device for generating renewable energy using waste biomass as a raw material. At present, however, it has not reached the desired practical application because of the low-power generation; hence, improvements on fuel cell efficiency, such as electrode materials, are still being examined. Here, we focus on the microorganisms that can be used as catalysts and play a central role in improving the efficiency of the fuel cells. Several kinds of microbial catalysts are used in MFCs. For example, Shewanella oneidensis has been well studied, and as known, since S. oneidensis transports the electrons generated within the cell to the surface layer, it does not require a mediator to pass the electrons from the cells to the electrode. Furthermore, Escherichia coli and Saccharomyces cerevisiae, a model organism for MFCs, are also used. The improvements of such microbial catalysts have also been proceeding actively. Here, we elaborated on the principle of MFCs as well as the current situation and latest research on the catalyst development.

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“…In this improved system, copper was recovered at the surface of an electrode with a purity of 99% . As an alternative for acetate, electron donors present in mining waste streams, like for example tetrathionate, have been tested for their suitability as bioanodes. In remote mining locations when waste streams are not available in the vicinity of metal streams, hydrogen, which is produced on site, could be used as an electron donor .…”

Section: Introductionmentioning

confidence: 99%

Prototype of a scaled‐up microbial fuel cell for copper recovery

Motos

Molina²,

Heijne

et al. 2017

J of Chemical Tech & Biotech

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BackgroundBioelectrochemical systems (BESs) enable recovery of electrical energy through oxidation of a wide range of substrates at an anode and simultaneous recovery of metals at a cathode. Scale‐up of BESs from the laboratory to pilot scale is a challenging step in the development of the process, and there are only a few successful experiences to build on. This paper presents a prototype BES for the recovery of copper.ResultsThe cell design presented here had removable electrodes, similar to those in electroplating baths. The anode and cathode in this design could be replaced independently. The prototype bioelectrochemical cell consisted of an 835 cm2 bioanode fed with acetate, and a 700 cm2 cathode fed with copper. A current density of 1.2 A/−2 was achieved with 48 mW m−2 of power production. The contribution of each component (anode, electrolytes, cathode and membrane) was evaluated through the analysis of the internal resistance distribution. This revealed that major losses occurred at the anode, and that the design with removable electrodes results in higher internal resistance compared with other systems. To further assess the practical applicability of BES for copper recovery, an economic evaluation was performed.ConclusionAnalysis shows that the internal resistance of several lab‐scale BESs is already sufficiently low to make the system economic, while the internal resistance for scaled‐up systems still needs to be improved considerably to become economically applicable.© 2017 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

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Possibilities for extremophilic microorganisms in microbial electrochemical systems

Cited by 102 publications

References 158 publications

Effect of surface roughness, porosity and roughened micro-pillar structures on the early formation of microbial anodes

Effect of surface roughness, porosity and roughened micro-pillar structures on the early formation of microbial anodes

Catalyst Development of Microbial Fuel Cells for Renewable-Energy Production

Prototype of a scaled‐up microbial fuel cell for copper recovery

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