Studying Water and Solute Transport through Desalination Membranes via Neutron Radiography

Published

October 25, 2017

Author(s)

Devin L. Shaffer, Jacob M. LaManna, David L. Jacobson, Daniel S. Hussey, Menachem Elimelech, Edwin P. Chan

Abstract

Neutron radiography, a non-destructive imaging technique, is applied to study water and solute transport through desalination membranes. Specifically, we use neutron radiography to quantify lithium chloride draw solute concentrations across a thin-film composite membrane during forward osmosis permeation. This measurement provides direct visual confirmation of incomplete support layer wetting and reveals significant dilutive external concentration polarization of the draw solution outside of the membrane support layer. These transport-limiting phenomena have been hypothesized in previous work and are not accounted for in the standard thin-film model of forward osmosis permeation, resulting in inaccurate estimations of membrane transport properties. Our work demonstrates neutron radiography as a powerful measurement tool for studying membrane transport and emphasizes the need for direct experimental measurements to refine the forward osmosis transport model.

Citation

Journal of Membrane Science

Pub Type

Journals

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Keywords

neutron radiography, forward osmosis, concentration polarization, wetting

Citation

Shaffer, D. , LaManna, J. , Jacobson, D. , Hussey, D. , Elimelech, M. and Chan, E. (2017), Studying Water and Solute Transport through Desalination Membranes via Neutron Radiography, Journal of Membrane Science, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=923184 (Accessed December 14, 2024)