Performance metrics for the objective assessment of capacitive deionization systems
Abstract
In the growing field of capacitive deionization (CDI), a number of performance metrics have emerged to describe the desalination process. Unfortunately, the separation conditions under which these metrics are measured are often not specified, resulting in optimal performance at minimal removal. Here in this paper we outline a system of performance metrics and reporting conditions that resolves this issue. Our proposed system is based on volumetric energy consumption (Wh/m3) and throughput productivity (L/h/m2) reported for a specific average concentration reduction, water recovery, and feed salinity. To facilitate and rationalize comparisons between devices, materials, and operation modes, we propose a nominal standard separation of removing 5 mM from a 20 mM NaCl feed solution at 50% water recovery. We propose this particular separation as a standard, but emphasize that the rationale presented here applies irrespective of separation details. Using our proposed separation, we compare the desalination performance of a flow-through electrode (fte-CDI) cell and a flow between membrane (fb-MCDI) device, showing how significantly different systems can be compared in terms of generally desirable desalination characteristics. In general, we find that performance analysis must be considered carefully so to not allow for ambiguous separation conditions or the maximization of one metric atmore »
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1531179
- Alternate Identifier(s):
- OSTI ID: 1513122
- Report Number(s):
- LLNL-JRNL-749416
Journal ID: ISSN 0043-1354; S0043135418308911; PII: S0043135418308911
- Grant/Contract Number:
- AC52-07NA27344; 18-ERD-024
- Resource Type:
- Published Article
- Journal Name:
- Water Research
- Additional Journal Information:
- Journal Name: Water Research Journal Volume: 152 Journal Issue: C; Journal ID: ISSN 0043-1354
- Publisher:
- Elsevier
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Capacitive desalination; Capacitive deionization; CDI; Performance
Citation Formats
Hawks, Steven A., Ramachandran, Ashwin, Porada, Slawomir, Campbell, Patrick G., Suss, Matthew E., Biesheuvel, P. M., Santiago, Juan G., and Stadermann, Michael. Performance metrics for the objective assessment of capacitive deionization systems. United Kingdom: N. p., 2019.
Web. doi:10.1016/j.watres.2018.10.074.
Hawks, Steven A., Ramachandran, Ashwin, Porada, Slawomir, Campbell, Patrick G., Suss, Matthew E., Biesheuvel, P. M., Santiago, Juan G., & Stadermann, Michael. Performance metrics for the objective assessment of capacitive deionization systems. United Kingdom. https://doi.org/10.1016/j.watres.2018.10.074
Hawks, Steven A., Ramachandran, Ashwin, Porada, Slawomir, Campbell, Patrick G., Suss, Matthew E., Biesheuvel, P. M., Santiago, Juan G., and Stadermann, Michael. Mon .
"Performance metrics for the objective assessment of capacitive deionization systems". United Kingdom. https://doi.org/10.1016/j.watres.2018.10.074.
@article{osti_1531179,
title = {Performance metrics for the objective assessment of capacitive deionization systems},
author = {Hawks, Steven A. and Ramachandran, Ashwin and Porada, Slawomir and Campbell, Patrick G. and Suss, Matthew E. and Biesheuvel, P. M. and Santiago, Juan G. and Stadermann, Michael},
abstractNote = {In the growing field of capacitive deionization (CDI), a number of performance metrics have emerged to describe the desalination process. Unfortunately, the separation conditions under which these metrics are measured are often not specified, resulting in optimal performance at minimal removal. Here in this paper we outline a system of performance metrics and reporting conditions that resolves this issue. Our proposed system is based on volumetric energy consumption (Wh/m3) and throughput productivity (L/h/m2) reported for a specific average concentration reduction, water recovery, and feed salinity. To facilitate and rationalize comparisons between devices, materials, and operation modes, we propose a nominal standard separation of removing 5 mM from a 20 mM NaCl feed solution at 50% water recovery. We propose this particular separation as a standard, but emphasize that the rationale presented here applies irrespective of separation details. Using our proposed separation, we compare the desalination performance of a flow-through electrode (fte-CDI) cell and a flow between membrane (fb-MCDI) device, showing how significantly different systems can be compared in terms of generally desirable desalination characteristics. In general, we find that performance analysis must be considered carefully so to not allow for ambiguous separation conditions or the maximization of one metric at the expense of another. Additionally, for context and clarity, we discuss a number of important underlying performance indicators and cell characteristics that are not performance measures in and of themselves but can be examined to better understand differences in performance.},
doi = {10.1016/j.watres.2018.10.074},
journal = {Water Research},
number = C,
volume = 152,
place = {United Kingdom},
year = {Mon Apr 01 00:00:00 EDT 2019},
month = {Mon Apr 01 00:00:00 EDT 2019}
}
https://doi.org/10.1016/j.watres.2018.10.074
Web of Science
Figures / Tables:
Works referencing / citing this record:
Faradaic reactions in capacitive deionization for desalination and ion separation
journal, January 2019
- Yu, Fei; Wang, Lei; Wang, Ying
- Journal of Materials Chemistry A, Vol. 7, Issue 27
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journal, January 2020
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Capacitive deionization and electrosorption: from desalination to ion management
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Assembly of Soft Electrodes and Ion Exchange Membranes for Capacitive Deionization
journal, September 2019
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Figures / Tables found in this record: