Garden compost inoculum leads to microbial bioanodes with potential-independent characteristics

Cercado, Bibiana; Byrne, Nathalie; Bertrand, Mathieu; Pocaznoi, Diana; Rimboud, Mickaël; Achouak, Wafa; Bergel, Alain

doi:10.1016/j.biortech.2013.01.123

Cited by 60 publications

(48 citation statements)

References 34 publications

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“…After air exposure, the current density was lower than could have been expected considering the current density obtained with the second pulse (average of 19.3 A/m 2 ). It has been previously reported that the current density increased with a third pulse of acetate, due to the biofilm growth (Cercado et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Protons accumulation during anodic phase turned to advantage for oxygen reduction during cathodic phase in reversible bioelectrodes

Blanchet

Pécastaings

Erable

et al. 2014

Bioresource Technology

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 13877 b s t r a c tReversible bioelectrodes were designed by alternating acetate and oxygen supply. It was demonstrated that the protons produced and accumulated inside the biofilm during the anodic phase greatly favored the oxygen reduction reaction when the electrode was switched to become the biocathode. Protons accumulation, which hindered the bioanode operation, thus became an advantage for the biocathode. The bioanodes, formed from garden compost leachate under constant polarization at À0.2 V vs. SCE, were able to support long exposure to forced aeration, with only a slight alteration of their anodic efficiency. They produced a current density of 16 ± 1.7 A/m 2 for acetate oxidation and up to À0.4 A/m 2 for oxygen reduction. Analysis of the microbial communities by 16S rRNA pyrosequencing revealed strong selection of Chloroflexi (49 ± 1%), which was not observed for conventional bioanodes not exposed to oxygen. Chloroflexi were found as the dominant phylum of electroactive biofilms for the first time.

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Section: Resultsmentioning

confidence: 99%

Protons accumulation during anodic phase turned to advantage for oxygen reduction during cathodic phase in reversible bioelectrodes

Blanchet

Pécastaings

Erable

et al. 2014

Bioresource Technology

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“…The biological approach is based on an improvement of the biofilm performance by means of sophisticated biofilm growth procedures. Therefore, electroactive biofilms can easily be grown using inoculi such as wastewater, soil, compost, or sediments (Liu et al, 2008;Cercado et al, 2013;Ketep et al, 2013), without any bacterial extraction steps. Using these inoculi, primary electroactive biofilms are produced, which already exhibit a good electrocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Performance of Primary and Secondary Electroactive Biofilms Using Layered Corrugated Carbon Electrodes

2014

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The performance of primary and secondary electroactive biofilms grown on layered corrugated carbon (LCC) electrodes was studied over a period of several months. With an average projected current density of 6.7 mA cm −2 , the studied secondary electroactive biofilms outperformed the primary biofilms (3.0 mA cm −2 ) over the entire experimental period. At the same time, both, primary and secondary biofilms, exhibited a constant Coulomb efficiency of about 89%. The study further illustrates that three-dimensional electrodes such as LCC allow a sustained long-term performance without significant decrease in electrode performance.

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“…Unfortunately, the formation of microbial anodes from natural media often takes a long time, up to several weeks [18,19]. This is a hindrance for researchers, who need to carry out multiple experiments, and for engineers, who seek to shorten the start-up time of the related processes.…”

Section: Introductionmentioning

confidence: 99%

“…Microbial anodes were formed in a leachate of garden compost under controlled potential at À0.20 V/SCE [18,19]. Four reactors were implemented at 40 C and four others at 25 C. Microbial anodes formed at 40 C produced higher current densities than those formed at 25 C (Fig.…”

Section: Microbial Anode Formation In Garden Compost Leachatementioning

confidence: 99%

“…Firstly, microbial anodes were formed in a leachate of garden compost, which was used as both the culture medium and the inoculum as described elsewhere [18,61]. The leachate was obtained by filtering a mix of 1.5 L of garden compost and 2.25 L of water, containing 60 mM KCl, through a cloth with a large mesh.…”

Section: Microbial Anode Formation and Electrochemical Proceduresmentioning

confidence: 99%

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Increasing the temperature is a relevant strategy to form microbial anodes intended to work at room temperature

Oliot¹,

Erable²,

Solan³

et al. 2017

Electrochimica Acta

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Reducing the time required for the formation of microbial anodes from environmental inocula is a great challenge. The possibility of reaching this objective by increasing the temperature during the bioanode preparation was investigated here. Microbial anodes were formed at 25 C and 40 C under controlled potential with successive acetate additions. At 25 C, around 40 days were required to perform three acetate batches, which led to current density of 9.4 ± 2 A.m À2 , while at 40 C, 20 days were sufficient to complete three similar batches, leading to 22.9 ± 4.2 A.m À2 . The bioanodes formed at 40 C revealed three redox systems and those formed at 25 C only one. The temperature also impacted the biofilm structure, which was less compact at 40 C. When the bioanodes formed at 40 C were switched to 25 C, they produced current densities similar to those of bioanodes formed at 25 C; they recovered the single redox system that was developed by the bioanodes formed at 25 C and the difference in biofilm structures was mitigated. It is consequently fully appropriate to accelerate the formation of microbial anodes by increasing the temperatures to 40 C even if they are finally intended to operate at room temperature.

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Garden compost inoculum leads to microbial bioanodes with potential-independent characteristics

Cited by 60 publications

References 34 publications

Protons accumulation during anodic phase turned to advantage for oxygen reduction during cathodic phase in reversible bioelectrodes

Protons accumulation during anodic phase turned to advantage for oxygen reduction during cathodic phase in reversible bioelectrodes

Long-Term Performance of Primary and Secondary Electroactive Biofilms Using Layered Corrugated Carbon Electrodes

Increasing the temperature is a relevant strategy to form microbial anodes intended to work at room temperature

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