This study describes the use of a microbial electrolysis cells for the production of gaseous biofuels sustained by the oxidation of a synthetic wastewater. During the overall experimental investigation, the MEC’s bioanode removed on average 855 ± 57 mgCOD/d producing an average electric current of 66 ± 7 mA which was diverted into gaseous biofuels like biomethane, biohydrogen and biohythane. Three different MEC cathodic configurations were investigated selecting the electrodic materials (graphite granules GG, and mixed metal oxide MMO) and operating conditions (pH of the catholyte, additional sorption chamber). Biomethane production increased from 26 ± 4–102 ± 8 meq/d when the MMO electrode was used with respect to GG electrodic material. In contrast, the MMO electrode in combination with a CO2 sorption chamber was successfully utilized for simultaneous H2 production and CO2 sorption from a N2/CO2 mixture which simulates an anaerobic digestion biogas. The combination of H2 production and CO2 sorption allowed to obtain a gaseous mixture composed of 9% H2, 5% CO2, and 80% N2 that according to the assumption of replacing the N2/CO2 mixture with real biogas corresponded to a commercial-grade biohythane. Overall, the results highlight the potential of MECs as an efficient approach for biogas upgrading, allowing biohythane production increasing CH4 content and lowering CO2 concentration.

Renewable gases production coupled to synthetic wastewater treatment through a microbial electrolysis cell / Cristiani, Lorenzo; Zeppilli, Marco; Fazi, Giuliano; Marandola, Clara; Villano, Marianna. - In: BIOCHEMICAL ENGINEERING JOURNAL. - ISSN 1369-703X. - 205:(2024), p. 109249. [10.1016/j.bej.2024.109249]

Renewable gases production coupled to synthetic wastewater treatment through a microbial electrolysis cell

Cristiani, Lorenzo;Zeppilli, Marco
;
Marandola, Clara;Villano, Marianna
2024

Abstract

This study describes the use of a microbial electrolysis cells for the production of gaseous biofuels sustained by the oxidation of a synthetic wastewater. During the overall experimental investigation, the MEC’s bioanode removed on average 855 ± 57 mgCOD/d producing an average electric current of 66 ± 7 mA which was diverted into gaseous biofuels like biomethane, biohydrogen and biohythane. Three different MEC cathodic configurations were investigated selecting the electrodic materials (graphite granules GG, and mixed metal oxide MMO) and operating conditions (pH of the catholyte, additional sorption chamber). Biomethane production increased from 26 ± 4–102 ± 8 meq/d when the MMO electrode was used with respect to GG electrodic material. In contrast, the MMO electrode in combination with a CO2 sorption chamber was successfully utilized for simultaneous H2 production and CO2 sorption from a N2/CO2 mixture which simulates an anaerobic digestion biogas. The combination of H2 production and CO2 sorption allowed to obtain a gaseous mixture composed of 9% H2, 5% CO2, and 80% N2 that according to the assumption of replacing the N2/CO2 mixture with real biogas corresponded to a commercial-grade biohythane. Overall, the results highlight the potential of MECs as an efficient approach for biogas upgrading, allowing biohythane production increasing CH4 content and lowering CO2 concentration.
2024
Biomethane, biohydrogen, biohythane, microbial electrolysis cell
01 Pubblicazione su rivista::01a Articolo in rivista
Renewable gases production coupled to synthetic wastewater treatment through a microbial electrolysis cell / Cristiani, Lorenzo; Zeppilli, Marco; Fazi, Giuliano; Marandola, Clara; Villano, Marianna. - In: BIOCHEMICAL ENGINEERING JOURNAL. - ISSN 1369-703X. - 205:(2024), p. 109249. [10.1016/j.bej.2024.109249]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1704236
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