The benefits of hybridising electrodialysis with reverse osmosis
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ED_RO_Hybrid_Final.pdf
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941.48 KB
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Author(s)
Zubair, Syed M.
McGovern, Ronan Killian
Lienhard, John H
Date Issued
July 2014
Journal
Journal of Membrane Science
Publisher
Elsevier
Citation
McGovern, Ronan K., Syed M. Zubair, and John H. Lienhard V. “The Benefits of Hybridising Electrodialysis with Reverse Osmosis.” Journal of Membrane Science 469 (November 2014): 326–335.
Version
Author's final manuscript
Abstract
A cost analysis reveals that hybridisation of electrodialysis with reverse osmosis is only justified if the cost of water from the reverse osmosis unit is less than 40% of that from a stand-alone electrodialysis system. In such cases the additional reverse osmosis costs justify the electrodialysis cost savings brought about by shifting salt removal to higher salinity, where current densities are higher and equipment costs lower. Furthermore, the analysis suggests that a simple hybrid configuration is more cost effective than a recirculated hybrid, a simple hybrid being one where the reverse osmosis concentrate is fed to the electrodialysis stack and the products from both units are blended, and a recirculated being one hybrid involving recirculation of the electrodialysis product back to the reverse osmosis unit. The underlying rationale is that simple hybridisation shifts salt removal away from the lowest salinity zone of operation, where salt removal is most expensive. Further shifts in the salinity at which salt is removed, brought about by recirculation, do not justify the associated increased costs of reverse osmosis.
MIT Department
Massachusetts Institute of Technology. Abdul Latif Jameel World Water & Food Security Lab
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1016/j.memsci.2014.06.040
