Flow and process modelling of an MCDI for selective desalination
Activity: Talk or presentation at external institutions/events › Talk/Presentation › Contributed
Persons and affiliations
- David Schödel - , Chair of Process Engineering in Hydro Systems (Speaker)
- Hossein Mehdipour - , Chair of Process Engineering in Hydro Systems (Involved person)
- Masoud Haghshenasfard - , Chair of Process Engineering in Hydro Systems (Involved person)
- Hanna Rosentreter - , Chair of Process Engineering in Hydro Systems (Involved person)
- André Paul Lerch - , Chair of Process Engineering in Hydro Systems (Involved person)
Date
8 Sept 2024 → 12 Sept 2024
Description
Introduction. Membrane capacitive deionization (MCDI) has the potential to become an energy efficient alternative to commonly used desalination technologies for slightly saline waters [1]. Energy consumption can further be optimized when selectivity for monovalent ions is enhanced and losses due to electric resistance are reduced. Thin, spacer filled flow channels promote electric conductivity within a desalination cell, but are challenging for flow simulations and tracer tests.Experimental/methodology. Within the joint project innovatION, the development of a monovalent selective MCDI is supported by flow and process simulations using ANSYS [2]. Pressure loss experiments are used to calibrate and validate the flow model for 270 and 500 µm spacers and flow characteristics in lab- and pilot scale are determined with different tracers. The process model is implemented in ANSYS Fluent using User Defined Functions and is based on the modified Donnan approach [3]. Calibration data is obtained in lab scale, using different salt solutions at varying process paramters.
Results and discussion. By changing the inflow geometries, the pressure drop in laboratory scale could be reduced by 20 %. Tracer experiments showed that ink emerged as the most suitable tracer to visualize the flow profile and stagnation zones in thin flow channels. Furthermore, the results from the process model and the approach and challenges of modelling ion selectivity will be presented and discussed.
References
[1] Rosentreter, H.; Walther, M.; Lerch, A. Membranes 2021, 11, 126
[2] https://www.innovat-ion.de/en-US
[3] Biesheuvel, P.M. et al. Journal of Colloid and Interface Science 2011, 360, 239-248
Conference
Title | EuroMembrane 2024 |
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Abbreviated title | EuroMembrane 2024 |
Duration | 8 - 12 September 2024 |
Website | |
Degree of recognition | International event |
Location | Prague Congress Centre |
City | Prague |
Country | Czech Republic |
Keywords
Research priority areas of TU Dresden
DFG Classification of Subject Areas according to Review Boards
Subject groups, research areas, subject areas according to Destatis
Sustainable Development Goals
Keywords
- CFD, MCDI, electrochemical, desalination