Comments on “Comparison of energy consumption in desalination by capacitive deionization and reverse osmosis”
Abstract
Capacitive deionization (CDI) is an emerging brackish water desalination technology in which ions are removed from water by electrostatically adsorbing them onto porous electrodes. Recently, Qin et al. presented an estimate of energy consumption for CDI schemes, and compared the energy consumption of CDI to the energy consumption of a particular reverse osmosis operation scheme which they propose. Qin et al. estimate very high values of energy consumption in CDI for brackish water desalination (e.g. ~1 to 2 g/L salt solution), and these values and trends do not agree with published experiments for CDI or with experimentally validated models for CDI. The current comment identifies important scaling errors and incorrect values in their model resistance parameters, and then discusses unphysical trends predicted by their model. We do not attempt provide a comprehensive review of their model, operation, estimates, and figures, but rather concentrate on several key issues. We present our comments in two sections dealing with resistances and energy metrics, respectively.
- Authors:
-
- Stanford Univ., CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1524301
- Report Number(s):
- LLNL-JRNL-770722
Journal ID: ISSN 0011-9164; 961269
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Desalination
- Additional Journal Information:
- Journal Volume: 461; Journal Issue: C; Journal ID: ISSN 0011-9164
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Ramachandran, Ashwin, Oyarzun, Diego I., Hawks, Steven A., Campbell, Patrick G., Stadermann, Michael, and Santiago, Juan G. Comments on “Comparison of energy consumption in desalination by capacitive deionization and reverse osmosis”. United States: N. p., 2019.
Web. doi:10.1016/j.desal.2019.03.010.
Ramachandran, Ashwin, Oyarzun, Diego I., Hawks, Steven A., Campbell, Patrick G., Stadermann, Michael, & Santiago, Juan G. Comments on “Comparison of energy consumption in desalination by capacitive deionization and reverse osmosis”. United States. https://doi.org/10.1016/j.desal.2019.03.010
Ramachandran, Ashwin, Oyarzun, Diego I., Hawks, Steven A., Campbell, Patrick G., Stadermann, Michael, and Santiago, Juan G. Tue .
"Comments on “Comparison of energy consumption in desalination by capacitive deionization and reverse osmosis”". United States. https://doi.org/10.1016/j.desal.2019.03.010. https://www.osti.gov/servlets/purl/1524301.
@article{osti_1524301,
title = {Comments on “Comparison of energy consumption in desalination by capacitive deionization and reverse osmosis”},
author = {Ramachandran, Ashwin and Oyarzun, Diego I. and Hawks, Steven A. and Campbell, Patrick G. and Stadermann, Michael and Santiago, Juan G.},
abstractNote = {Capacitive deionization (CDI) is an emerging brackish water desalination technology in which ions are removed from water by electrostatically adsorbing them onto porous electrodes. Recently, Qin et al. presented an estimate of energy consumption for CDI schemes, and compared the energy consumption of CDI to the energy consumption of a particular reverse osmosis operation scheme which they propose. Qin et al. estimate very high values of energy consumption in CDI for brackish water desalination (e.g. ~1 to 2 g/L salt solution), and these values and trends do not agree with published experiments for CDI or with experimentally validated models for CDI. The current comment identifies important scaling errors and incorrect values in their model resistance parameters, and then discusses unphysical trends predicted by their model. We do not attempt provide a comprehensive review of their model, operation, estimates, and figures, but rather concentrate on several key issues. We present our comments in two sections dealing with resistances and energy metrics, respectively.},
doi = {10.1016/j.desal.2019.03.010},
journal = {Desalination},
number = C,
volume = 461,
place = {United States},
year = {Tue Apr 02 00:00:00 EDT 2019},
month = {Tue Apr 02 00:00:00 EDT 2019}
}
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Works referenced in this record:
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Energy breakdown in capacitive deionization
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Works referencing / citing this record:
Emerging investigator series: capacitive deionization for selective removal of nitrate and perchlorate: impacts of ion selectivity and operating constraints on treatment costs
journal, January 2020
- Hand, Steven; Cusick, Roland D.
- Environmental Science: Water Research & Technology, Vol. 6, Issue 4