Influence of concentration polarization and thermodynamic non-ideality on salt transport in reverse osmosis membranes

Jang, Eui-Soung; Mickols, William; Sujanani, Rahul; Helenic, Alysha; Dilenschneider, Theodore J.; Kamcev, Jovan; Paul, Donald R.; Freeman, Benny D.

doi:10.1016/j.memsci.2018.11.006

Title: Influence of concentration polarization and thermodynamic non-ideality on salt transport in reverse osmosis membranes

Journal Article · 15 February 2019 · Journal of Membrane Science

DOI: https://doi.org/10.1016/j.memsci.2018.11.006 · OSTI ID:1566466

Jang, Eui-Soung ^[1]; Mickols, William ^[2]; Sujanani, Rahul ^[1]; Helenic, Alysha ^[1]; Dilenschneider, Theodore J. ^[1]; Kamcev, Jovan ^[1]; Paul, Donald R. ^[1]; Freeman, Benny D. ^[1]

Univ. of Texas. Austin, TX (United States). Dept. of Chemical Engineering; Univ. of Texas. Austin, TX (United States). Texas Materials Inst.; Univ. of Texas. Austin, TX (United States). Center for Energy and Environmental Resources; Univ. of Texas. Austin, TX (United States). Center for Research in Water Resources
Mickols Consulting LLC, Tenino, WA (United States)

The classic Merten and Lonsdale transport model for reverse osmosis membranes was reformulated to explicitly demonstrate the effects of concentration polarization and solution phase thermodynamic non-idealities on salt transport. A framework presented here accounts for the concentration dependence of ion activity coefficients in salt solutions, which was not explicitly included in the classic model. This approach was applied to four salt solutions, NaCl, MgCl₂, CaCl₂, and Na₂SO₄, tested in cross-flow conditions for a commercial RO membrane, Dow Filmtec™ BW30XFR. Salt transport coefficients corrected for concentration polarization and non-ideal thermodynamic effects, B_a, were calculated as a function of permeate flux and compared with apparent salt transport coefficients, B. Finally, these corrections were significant, resulting in B_a values greater than B values by a factor of 1.3–2.1 for 2:1 and 1:2 salts (i.e., MgCl₂, CaCl₂, and Na₂SO₄). B_a values for NaCl (a 1:1 salt), however, were similar to or somewhat smaller than B values.

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Research Organization:: Energy Frontier Research Centers (EFRC), Washington D.C. (United States). Center for Materials for Water and Energy Systems (M-WET); Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0019272

OSTI ID:: 1566466

Journal Information:: Journal of Membrane Science, Journal Name: Journal of Membrane Science Journal Issue: C Vol. 572; ISSN 0376-7388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
The Merten and Lonsdale model
catalysis (heterogeneous)
charge transport
desalination
materials and chemistry by design
membranes
mesoscale science
mesostructured materials
reverse osmosis (RO)
salt transport
separations
synthesis (novel materials)
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water

Title: Influence of concentration polarization and thermodynamic non-ideality on salt transport in reverse osmosis membranes

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References (24)

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