Comments on “Comparison of energy consumption in desalination by capacitive deionization and reverse osmosis”

Ramachandran, Ashwin; Oyarzun, Diego I.; Hawks, Steven A.; Campbell, Patrick G.; Stadermann, Michael; Santiago, Juan G.

doi:10.1016/j.desal.2019.03.010

Title: Comments on “Comparison of energy consumption in desalination by capacitive deionization and reverse osmosis”

Journal Article · Tue Apr 02 00:00:00 EDT 2019 · Desalination

DOI:https://doi.org/10.1016/j.desal.2019.03.010· OSTI ID:1524301

Ramachandran, Ashwin ^[1]; Oyarzun, Diego I. ^[1]; Hawks, Steven A. ^[2]; Campbell, Patrick G. ^[2]; Stadermann, Michael ^[2]; Santiago, Juan G. ^[1]

Stanford Univ., CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1524301

Report Number(s):: LLNL-JRNL-770722; 961269

Journal Information:: Desalination, Vol. 461, Issue C; ISSN 0011-9164

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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References (20)

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Cited By (1)

Emerging investigator series: capacitive deionization for selective removal of nitrate and perchlorate: impacts of ion selectivity and operating constraints on treatment costs Hand, Steven; Cusick, Roland D. Environmental Science: Water Research & Technology, Vol. 6, Issue 4 https://doi.org/10.1039/c9ew01105f	journal	January 2020

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