Voltage- and flow-controlled electrodialysis batch operation: Flexible and optimized brackish water desalination
Name
WRAP-voltage-flow-controlled-electrodialysis-batch-operation-He-2020.pdf
Description
Accepted version
Size
1.98 MB
Format
Adobe PDF
Checksum (MD5)
892d8d50bdbfc1c685ccef4a630fbcf6
Author(s)
He, Wei
Le Henaff, Anne-Claire
Amrose, Susan
Buonassisi, Tonio
Peters, Ian Marius
Winter, Amos G
Date Issued
2021
Journal
Desalination
Publisher
Elsevier BV
Citation
He, Wei, Le Henaff, Anne-Claire, Amrose, Susan, Buonassisi, Tonio, Peters, Ian Marius et al. 2021. "Voltage- and flow-controlled electrodialysis batch operation: Flexible and optimized brackish water desalination." Desalination, 500.
Version
Original manuscript
Abstract
© 2020 Elsevier B.V. Electrodialysis (ED) desalination has been demonstrated to be more energy-efficient, provide higher-recovery, and be lower-cost for producing drinking water from saline groundwater compared to reverse osmosis. These benefits of ED could translate into cost-effective, renewable-powered desalination solutions. However, the challenge of using a variable power source (e.g. solar) with traditional steady-state ED operation requires batteries to reshape the power source to match the desalination load; these batteries often contribute to a large fraction of the produced water cost. In this study, we propose a time-variant voltage- and flow-controlled ED operation that can enable highly flexible desalination from variable power sources, including renewables, with negligible batteries, potentially leading to reduced water costs compared to what existing technology can provide. A model-based controller is presented which varies applied ED stack voltage and pumping flow rate to match power consumption to a variable source while maximizing desalination rate throughout an ED batch. The utility of the controller was demonstrated with a pilot-scale system tested with brackish groundwater, which operated as expected under varying fixed power levels and a real solar irradiance profile. The pilot system achieved a production rate up to 45% higher than that of an equivalently sized traditional steady-state ED system.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/J.DESAL.2020.114837
