Design of 3D microbial anodes for microbial electrolysis cells (MEC) fuelled by domestic wastewater. Part I: Multiphysics modelling
| Autor: | Benjamin Erable, Alain Bergel, Régine Basséguy, Rémy Lacroix, Serge Da Silva, Luc Etcheverry, Emma Roubaud |
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| Přispěvatelé: | 6T-MIC Ingénieries (FRANCE), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, 6T-MIC Ingenieries (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Laboratoire de Génie Chimique - LGC (Toulouse, France) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Multiphysics 02 engineering and technology Electrolyte 010501 environmental sciences 01 natural sciences 7. Clean energy law.invention law Microbial electrolysis cell Génie chimique Chemical Engineering (miscellaneous) [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering Génie des procédés Porosity Waste Management and Disposal 0105 earth and related environmental sciences Hydrogen production Electrolysis Process Chemistry and Technology Chemical oxygen demand Domestic wastewater treatment 3D graphite electrodes Multiphysics modelling 021001 nanoscience & nanotechnology Pollution 6. Clean water Anode Bioelectrochemical systems Chemical engineering 0210 nano-technology |
| Zdroj: | Journal of Environmental Chemical Engineering Journal of Environmental Chemical Engineering, Elsevier, 2021, 9 (4), pp.105476. ⟨10.1016/j.jece.2021.105476⟩ |
| ISSN: | 2213-3437 |
| DOI: | 10.1016/j.jece.2021.105476⟩ |
| Popis: | International audience; The performance of a microbial electrolysis cell (MEC) supplied with domestic wastewater (dWW) is essentially limited by the kinetics of the anodic bioelectrochemical reactions and the low ionic conductivity of the electrolyte. A strategy to boost-up the anodic bioelectrochemical kinetics is to use three-dimensional (3D) microbial anodes that offer a high total anodic surface area and volume density of electroactive biofilm. In this work, a 3D multiphysics model was designed to simulate the current generation and resulting hydrogen production in double and triple-compartment MECs fed continuously with dWW. Simulations indicated that optimised 3D microbial anode geometries could simultaneously increase current and chemical oxygen demand (COD) removal by 86% compared to a 2D planar graphite electrode. At a constant CEM voltage, the current produced increased with the thickness of the 3D microbial anode up to a limiting thickness of 20 mm. Beyond this value, the current was stagnant due to the predominant ohmic drop. Current generation and COD removal could be further increased by designing 3D anode geometrical arrangements that force the dWWs to flow through the porosity of the 3D microbial anode. A gain of 20% was calculated by substituting a monolithic 3D graphite anode with a 3D anode of the same thickness (20 mm) but constructed of plates stacked on top of each other and spaced 2.5 mm apart. Finally, hydrogen production performance was additionally optimised by a further + 20% by switching from a two-compartment MEC design (anode-cathode) to a three-compartment MEC design (cathode-anode-cathode). |
| Databáze: | OpenAIRE |
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