Effects of Current on the Membrane and Boundary Layer Selectivity in Electrochemical Systems Designed for Nutrient Recovery
| Autor: | Mariana Rodrigues, Tom Sleutels, Philipp Kuntke, Cees J. N. Buisman, Hubertus V. M. Hamelers |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
WIMEK
Renewable Energy Sustainability and the Environment General Chemical Engineering limiting current nutrient recovery Environmental Chemistry Environmental Technology boundary layer-membrane selectivity electrochemical systems Milieutechnologie General Chemistry dynamic state Biological Recovery & Re-use Technology |
| Zdroj: | ACS Sustainable Chemistry and Engineering, 10(29), 9411-9418 ACS Sustainable Chemistry and Engineering 10 (2022) 29 |
| ISSN: | 2168-0485 |
| Popis: | During electrochemical nutrient recovery, current and ion exchange membranes (IEM) are used to extract an ionic species of interest (e.g., ion) from a mixture of multiple ions. The species of interest (ion 1) has an opposing charge to the IEM. When ion 1 is extracted from the solution, the species fractions at the membrane and the adjunct boundary layers are affected. Hence, the species transport through the electrochemical system (ES) can no longer be described as electrodialysis-like. A dynamic state is observed in the compartments, where the ionic species are recovered. When the boundary layer-membrane interface is depleted, the IEM is at maximum current. If the ES is operated at a current higher than the maximum current, the fluxes of both ion 1 and other competing ions, with the same charge (ion 2), occur. This means, for example, ion 1 will be recovered, and the concentration of ion 2 will build up in time. Therefore, a steady state is never reached. Ideally, to prevent the effect of limiting current at the boundary layer-membrane interface, ES for nutrient recovery should be operated at low currents. |
| Databáze: | OpenAIRE |
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