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The influence of pH, salt and temperature on nanofiltration performance

Nilsson, Mattias LU ; Trägårdh, Gun LU and Östergren, Karin LU (2008) In Journal of Membrane Science 312(1-2). p.97-106
Abstract
The influence of pH, KCl and temperature on the performance of an Alfa Laval NFT-50 nanofiltration membrane was evaluated by glucose and KCl retention measurements at constant flux. It was found that at constant temperature an increase in pH in the absence of KCl reduced the water permeability, and this was correlated to the electroviscous effect. The selectivity decreased with increasing KCl concentration and the decrease became more evident with increasing pH. The decrease in selectivity could be related to membrane swelling, and it appears that pH had no effect on swelling other than enhancing the effect of KCl. The influence of KCl and pH on membrane performance was evaluated as a function of temperature after reaching steady state at... (More)
The influence of pH, KCl and temperature on the performance of an Alfa Laval NFT-50 nanofiltration membrane was evaluated by glucose and KCl retention measurements at constant flux. It was found that at constant temperature an increase in pH in the absence of KCl reduced the water permeability, and this was correlated to the electroviscous effect. The selectivity decreased with increasing KCl concentration and the decrease became more evident with increasing pH. The decrease in selectivity could be related to membrane swelling, and it appears that pH had no effect on swelling other than enhancing the effect of KCl. The influence of KCl and pH on membrane performance was evaluated as a function of temperature after reaching steady state at 50 °C. The degree of swelling was higher at 50 °C than at 20 °C, due to an increase in polymer flexibility with increasing temperature. The decrease in selectivity with increasing temperature was less for KCl than for glucose, showing that the charge effect was influenced less by temperature than diffusion through the membrane. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Nanofiltration, Membrane performance, Elevated temperatures, Swelling, Electroviscous effect
in
Journal of Membrane Science
volume
312
issue
1-2
pages
97 - 106
publisher
Elsevier
external identifiers
  • WOS:000254813900012
  • Other:doi:1016/j.memsci.2007.12.059
  • Scopus:39749178267
ISSN
0376-7388
DOI
10.1016/j.memsci.2007.12.059
language
English
LU publication?
yes
id
b12a9c15-a046-4408-abd9-0fd010471375 (old id 1025119)
date added to LUP
2008-02-15 09:22:34
date last changed
2016-11-20 04:25:32
@misc{b12a9c15-a046-4408-abd9-0fd010471375,
  abstract     = {The influence of pH, KCl and temperature on the performance of an Alfa Laval NFT-50 nanofiltration membrane was evaluated by glucose and KCl retention measurements at constant flux. It was found that at constant temperature an increase in pH in the absence of KCl reduced the water permeability, and this was correlated to the electroviscous effect. The selectivity decreased with increasing KCl concentration and the decrease became more evident with increasing pH. The decrease in selectivity could be related to membrane swelling, and it appears that pH had no effect on swelling other than enhancing the effect of KCl. The influence of KCl and pH on membrane performance was evaluated as a function of temperature after reaching steady state at 50 °C. The degree of swelling was higher at 50 °C than at 20 °C, due to an increase in polymer flexibility with increasing temperature. The decrease in selectivity with increasing temperature was less for KCl than for glucose, showing that the charge effect was influenced less by temperature than diffusion through the membrane.},
  author       = {Nilsson, Mattias and Trägårdh, Gun and Östergren, Karin},
  issn         = {0376-7388},
  keyword      = {Nanofiltration,Membrane performance,Elevated temperatures,Swelling,Electroviscous effect},
  language     = {eng},
  number       = {1-2},
  pages        = {97--106},
  publisher    = {ARRAY(0xa439018)},
  series       = {Journal of Membrane Science},
  title        = {The influence of pH, salt and temperature on nanofiltration performance},
  url          = {http://dx.doi.org/10.1016/j.memsci.2007.12.059},
  volume       = {312},
  year         = {2008},
}