Use of Biochar-Based Cathodes and Increase in the Electron Flow by <i>Pseudomonas aeruginosa</i> to Improve Waste Treatment in Microbial Fuel Cells

In this paper, we tested the combined use of a biochar-based material at the cathode and of <i>Pseudomonas aeruginosa</i> strain in a single chamber, air cathode microbial fuel cells (MFCs) fed with a mix of shredded vegetable and phosphate buffer solution (PBS) in a 30% solid/liquid rat...

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Autores principales:	Rosa Anna Nastro, Fabio Flagiello, Nicandro Silvestri, Edvige Gambino, Giacomo Falcucci, Kuppam Chandrasekhar
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	waste-to-energy systems solid organic waste treatment microbial fuel cells <i>Pseudomonas aeruginosa</i> biochar Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/212ece22846043d1b24ab93a05830346
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spelling	oai:doaj.org-article:212ece22846043d1b24ab93a058303462021-11-25T18:50:37ZUse of Biochar-Based Cathodes and Increase in the Electron Flow by <i>Pseudomonas aeruginosa</i> to Improve Waste Treatment in Microbial Fuel Cells10.3390/pr91119412227-9717https://doaj.org/article/212ece22846043d1b24ab93a058303462021-10-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/1941https://doaj.org/toc/2227-9717In this paper, we tested the combined use of a biochar-based material at the cathode and of <i>Pseudomonas aeruginosa</i> strain in a single chamber, air cathode microbial fuel cells (MFCs) fed with a mix of shredded vegetable and phosphate buffer solution (PBS) in a 30% solid/liquid ratio. As a control system, we set up and tested MFCs provided with a composite cathode made up of a nickel mesh current collector, activated carbon and a single porous poly tetra fluoro ethylene (PTFE) diffusion layer. At the end of the experiments, we compared the performance of the two systems, in the presence and absence of <i>P. aeruginosa</i>, in terms of electric outputs. We also explored the potential reutilization of cathodes. Unlike composite material, biochar showed a life span of up to 3 cycles of 15 days each, with a pH of the feedstock kept in a range of neutrality. In order to relate the electric performance to the amount of solid substrates used as source of carbon and energy, besides of cathode surface, we referred power density (PD) and current density (CD) to kg of biomass used. The maximum outputs obtained when using the sole microflora were, on average, respectively 0.19 Wm<sup>−2</sup>kg<sup>−1</sup> and 2.67 Wm<sup>−2</sup>kg<sup>−1</sup>, with peaks of 0.32 Wm<sup>−2</sup>kg<sup>−1</sup> and 4.87 Wm<sup>−2</sup>kg<sup>−1</sup> of cathode surface and mass of treated biomass in MFCs with biochar and PTFE cathodes respectively. As to current outputs, the maximum values were 7.5 Am<sup>−2</sup> kg<sup>−1</sup> and 35.6 Am<sup>−2</sup>kg<sup>−1</sup> in MFCs with biochar-based material and a composite cathode. If compared to the utilization of the sole acidogenic/acetogenic microflora in vegetable residues, we observed an increment of the power outputs of about 16.5 folds in both systems when we added <i>P. aeruginosa</i> to the shredded vegetables. Even though the MFCs with PTFE-cathode achieved the highest performance in terms of PD and CD, they underwent a fouling episode after about 10 days of operation, with a dramatic decrease in pH and both PD and CD. Our results confirm the potentialities of the utilization of biochar-based materials in waste treatment and bioenergy production.Rosa Anna NastroFabio FlagielloNicandro SilvestriEdvige GambinoGiacomo FalcucciKuppam ChandrasekharMDPI AGarticlewaste-to-energy systemssolid organic waste treatmentmicrobial fuel cells<i>Pseudomonas aeruginosa</i>biocharChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 1941, p 1941 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	waste-to-energy systems solid organic waste treatment microbial fuel cells <i>Pseudomonas aeruginosa</i> biochar Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	waste-to-energy systems solid organic waste treatment microbial fuel cells <i>Pseudomonas aeruginosa</i> biochar Chemical technology TP1-1185 Chemistry QD1-999 Rosa Anna Nastro Fabio Flagiello Nicandro Silvestri Edvige Gambino Giacomo Falcucci Kuppam Chandrasekhar Use of Biochar-Based Cathodes and Increase in the Electron Flow by <i>Pseudomonas aeruginosa</i> to Improve Waste Treatment in Microbial Fuel Cells
description	In this paper, we tested the combined use of a biochar-based material at the cathode and of <i>Pseudomonas aeruginosa</i> strain in a single chamber, air cathode microbial fuel cells (MFCs) fed with a mix of shredded vegetable and phosphate buffer solution (PBS) in a 30% solid/liquid ratio. As a control system, we set up and tested MFCs provided with a composite cathode made up of a nickel mesh current collector, activated carbon and a single porous poly tetra fluoro ethylene (PTFE) diffusion layer. At the end of the experiments, we compared the performance of the two systems, in the presence and absence of <i>P. aeruginosa</i>, in terms of electric outputs. We also explored the potential reutilization of cathodes. Unlike composite material, biochar showed a life span of up to 3 cycles of 15 days each, with a pH of the feedstock kept in a range of neutrality. In order to relate the electric performance to the amount of solid substrates used as source of carbon and energy, besides of cathode surface, we referred power density (PD) and current density (CD) to kg of biomass used. The maximum outputs obtained when using the sole microflora were, on average, respectively 0.19 Wm<sup>−2</sup>kg<sup>−1</sup> and 2.67 Wm<sup>−2</sup>kg<sup>−1</sup>, with peaks of 0.32 Wm<sup>−2</sup>kg<sup>−1</sup> and 4.87 Wm<sup>−2</sup>kg<sup>−1</sup> of cathode surface and mass of treated biomass in MFCs with biochar and PTFE cathodes respectively. As to current outputs, the maximum values were 7.5 Am<sup>−2</sup> kg<sup>−1</sup> and 35.6 Am<sup>−2</sup>kg<sup>−1</sup> in MFCs with biochar-based material and a composite cathode. If compared to the utilization of the sole acidogenic/acetogenic microflora in vegetable residues, we observed an increment of the power outputs of about 16.5 folds in both systems when we added <i>P. aeruginosa</i> to the shredded vegetables. Even though the MFCs with PTFE-cathode achieved the highest performance in terms of PD and CD, they underwent a fouling episode after about 10 days of operation, with a dramatic decrease in pH and both PD and CD. Our results confirm the potentialities of the utilization of biochar-based materials in waste treatment and bioenergy production.
format	article
author	Rosa Anna Nastro Fabio Flagiello Nicandro Silvestri Edvige Gambino Giacomo Falcucci Kuppam Chandrasekhar
author_facet	Rosa Anna Nastro Fabio Flagiello Nicandro Silvestri Edvige Gambino Giacomo Falcucci Kuppam Chandrasekhar
author_sort	Rosa Anna Nastro
title	Use of Biochar-Based Cathodes and Increase in the Electron Flow by <i>Pseudomonas aeruginosa</i> to Improve Waste Treatment in Microbial Fuel Cells
title_short	Use of Biochar-Based Cathodes and Increase in the Electron Flow by <i>Pseudomonas aeruginosa</i> to Improve Waste Treatment in Microbial Fuel Cells
title_full	Use of Biochar-Based Cathodes and Increase in the Electron Flow by <i>Pseudomonas aeruginosa</i> to Improve Waste Treatment in Microbial Fuel Cells
title_fullStr	Use of Biochar-Based Cathodes and Increase in the Electron Flow by <i>Pseudomonas aeruginosa</i> to Improve Waste Treatment in Microbial Fuel Cells
title_full_unstemmed	Use of Biochar-Based Cathodes and Increase in the Electron Flow by <i>Pseudomonas aeruginosa</i> to Improve Waste Treatment in Microbial Fuel Cells
title_sort	use of biochar-based cathodes and increase in the electron flow by <i>pseudomonas aeruginosa</i> to improve waste treatment in microbial fuel cells
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/212ece22846043d1b24ab93a05830346
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Use of Biochar-Based Cathodes and Increase in the Electron Flow by <i>Pseudomonas aeruginosa</i> to Improve Waste Treatment in Microbial Fuel Cells

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