A theoretical basis for specifying nanofiltration membranes - dye/salt/water streams

W. Richard Bowen, Abdul Wahab Mohammad

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

The design and operation of membrane nanofiltration processes requires the use of good numerical predictive methods and prior characterisation of membrane properties. The best methods currently available are based on the use of the extended Nernst-Planck equation and a characterisation of the membrane in terms of the effective pore radius (rp), the effective charge density (Xd) and the ratio of effective membrane thickness to membrane porosity (Δx/Ak). When the ranges of such parameters for commercially available nanofiltration membranes are known, it becomes possible to use the numerical predictive method to choose the membrane best suited to a particular process requirement. The present paper considers such an analysis for the processing of dye/salt/water streams. It is shown that if the requirement is the removal of salt through diafiltration as part of the production process, then it is best to choose a membrane with a moderate value of rp (matching the hydrodynamic radius fo the dye), a low value of Xd and a low value of Δx/Ak. However, if the requirement is the removal of colour from a waste rinse stream, then the best results will be obtained by choosing a membrane with a high value of rp and a high value of Xd.

Original languageEnglish
Pages (from-to)257-264
Number of pages8
JournalDesalination
Volume117
Issue number1-3
DOIs
Publication statusPublished - 10 Sep 1998

Fingerprint

Nanofiltration membranes
Saline water
salt water
dye
Coloring Agents
Dyes
membrane
Membranes
numerical method
Charge density
Hydrodynamics
Salts
Porosity
Color
hydrodynamics
porosity
salt
Processing

ASJC Scopus subject areas

  • Filtration and Separation

Cite this

A theoretical basis for specifying nanofiltration membranes - dye/salt/water streams. / Bowen, W. Richard; Mohammad, Abdul Wahab.

In: Desalination, Vol. 117, No. 1-3, 10.09.1998, p. 257-264.

Research output: Contribution to journalArticle

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