Experimental analysis of negative salt rejection in nanofiltration membranes

J. Gilron; N. Gara; O. Kedem

doi:10.1016/S0376-7388(00)00639-6

Experimental analysis of negative salt rejection in nanofiltration membranes

J. Gilron, N. Gara, O. Kedem

Zuckerberg Institute for Water Research

Research output: Contribution to journal › Article › peer-review

111 Scopus citations

Abstract

The rejections of mixtures of polyelectrolyte (sodium polyacrylate) and a monovalent salt (NaCl) were measured as a function of flux for two nanofiltration (NF) membranes. These rejections were corrected for concentration polarization of both salt and polyelectrolyte. The feed concentration ratio of polyelectrolyte to salt ranged from 2 to 20. The extent of reduction in monovalent salt rejection in the presence of polyelectrolyte could be predicted based on the Donnan effect after evaluating the unbound fraction of polyelectrolyte counterion, φ_P, in independent dialysis experiments. In the dialysis experiments it was found that β was 0.32. From this the value of the Donnan partition coefficient, β was evaluated allowing for the effect of concentration polarization of both polyelectrolyte and salt. The concentration polarization of polyelectrolyte resulted in β changing as a function of flux.

Original language	English
Pages (from-to)	223-236
Number of pages	14
Journal	Journal of Membrane Science
Volume	185
Issue number	2
DOIs	https://doi.org/10.1016/S0376-7388(00)00639-6
State	Published - 30 Apr 2001

Keywords

Donnan distribution
Membrane transport
Nanofiltration
Negative rejection

ASJC Scopus subject areas

Biochemistry
General Materials Science
Physical and Theoretical Chemistry
Filtration and Separation

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10.1016/S0376-7388(00)00639-6

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title = "Experimental analysis of negative salt rejection in nanofiltration membranes",

abstract = "The rejections of mixtures of polyelectrolyte (sodium polyacrylate) and a monovalent salt (NaCl) were measured as a function of flux for two nanofiltration (NF) membranes. These rejections were corrected for concentration polarization of both salt and polyelectrolyte. The feed concentration ratio of polyelectrolyte to salt ranged from 2 to 20. The extent of reduction in monovalent salt rejection in the presence of polyelectrolyte could be predicted based on the Donnan effect after evaluating the unbound fraction of polyelectrolyte counterion, φP, in independent dialysis experiments. In the dialysis experiments it was found that β was 0.32. From this the value of the Donnan partition coefficient, β was evaluated allowing for the effect of concentration polarization of both polyelectrolyte and salt. The concentration polarization of polyelectrolyte resulted in β changing as a function of flux.",

keywords = "Donnan distribution, Membrane transport, Nanofiltration, Negative rejection",

author = "J. Gilron and N. Gara and O. Kedem",

note = "Funding Information: The authors wish to acknowledge the European Commission whose contract #BRPR-CT98-8001 supported this work and the Wolfsson Foundation grant for water desalination for additional support.",

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doi = "10.1016/S0376-7388(00)00639-6",

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T1 - Experimental analysis of negative salt rejection in nanofiltration membranes

AU - Gilron, J.

AU - Gara, N.

AU - Kedem, O.

N1 - Funding Information: The authors wish to acknowledge the European Commission whose contract #BRPR-CT98-8001 supported this work and the Wolfsson Foundation grant for water desalination for additional support.

PY - 2001/4/30

Y1 - 2001/4/30

N2 - The rejections of mixtures of polyelectrolyte (sodium polyacrylate) and a monovalent salt (NaCl) were measured as a function of flux for two nanofiltration (NF) membranes. These rejections were corrected for concentration polarization of both salt and polyelectrolyte. The feed concentration ratio of polyelectrolyte to salt ranged from 2 to 20. The extent of reduction in monovalent salt rejection in the presence of polyelectrolyte could be predicted based on the Donnan effect after evaluating the unbound fraction of polyelectrolyte counterion, φP, in independent dialysis experiments. In the dialysis experiments it was found that β was 0.32. From this the value of the Donnan partition coefficient, β was evaluated allowing for the effect of concentration polarization of both polyelectrolyte and salt. The concentration polarization of polyelectrolyte resulted in β changing as a function of flux.

AB - The rejections of mixtures of polyelectrolyte (sodium polyacrylate) and a monovalent salt (NaCl) were measured as a function of flux for two nanofiltration (NF) membranes. These rejections were corrected for concentration polarization of both salt and polyelectrolyte. The feed concentration ratio of polyelectrolyte to salt ranged from 2 to 20. The extent of reduction in monovalent salt rejection in the presence of polyelectrolyte could be predicted based on the Donnan effect after evaluating the unbound fraction of polyelectrolyte counterion, φP, in independent dialysis experiments. In the dialysis experiments it was found that β was 0.32. From this the value of the Donnan partition coefficient, β was evaluated allowing for the effect of concentration polarization of both polyelectrolyte and salt. The concentration polarization of polyelectrolyte resulted in β changing as a function of flux.

KW - Donnan distribution

KW - Membrane transport

KW - Nanofiltration

KW - Negative rejection

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U2 - 10.1016/S0376-7388(00)00639-6

DO - 10.1016/S0376-7388(00)00639-6

M3 - Article

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SN - 0376-7388

VL - 185

SP - 223

EP - 236

JO - Journal of Membrane Science

JF - Journal of Membrane Science

IS - 2

ER -

Experimental analysis of negative salt rejection in nanofiltration membranes

Abstract

Keywords

ASJC Scopus subject areas

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