Energy consumption of an electrodialyzer desalinating aqueous polymer solutions

When performing electrodialysis (ED) to desalinate a stream, both the energy for desalination and the energy for pumping contribute to the total energy consumption, although under typical working conditions (e.g., brackish water desalination) the latter is usually negligible. However, the energy pen...

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Bibliographic Details
Published inDesalination Vol. 510; p. 115091
Main Authors Sosa-Fernandez, P.A., Loc, T.M., Andrés-Torres, M., Tedesco, M., Post, J.W., Bruning, H., Rijnaarts, H.H.M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.08.2021
Subjects
Electrodialysis
Electrodialyzer
Energy-consumption
Pumping energy
Viscosity
Viscosity
Energy-consumption
Electrodialyzer
Electrodialysis
Pumping energy
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Summary:When performing electrodialysis (ED) to desalinate a stream, both the energy for desalination and the energy for pumping contribute to the total energy consumption, although under typical working conditions (e.g., brackish water desalination) the latter is usually negligible. However, the energy penalty might increase when desalinating viscous mixtures (i.e., viscosity of 2–20 cP). In this work, we experimentally investigate the desalination performance of an ED-unit operating with highly viscous water-polymer mixtures. The contribution of desalination and pumping energy to the total energy consumption was measured while varying diverse parameters, i.e., salinity and viscosity of the feed, and geometry and thickness of the spacer. It was found that the type of spacer did not significantly influence the energy required for desalination. The pumping energy was higher than predicted, though in most cases minimal compared to the energy for desalination. Only when using thin spacers (300 μm) and/or highly viscous feeds (12 cP), the pumping energy accounted for 50% of the total energy for low salinity feeds. Therefore, the main contributor to the energy consumption of viscous solutions is the desalination energy, provided that large spacer thicknesses (at least 450 μm) and adequate operating conditions are utilized to limit pumping energy losses. [Display omitted] •Electrodialysis of highly viscous fluids was experimentally investigated.•Effects of spacer thickness, fluid viscosity, salinity, and linear velocity considered•Increase in overall energy consumption only for high viscosity feeds + thin spacers
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2021.115091