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The influence of different kinds of pre-treatment on the performance of a polyamide nanofiltration membrane

Nilsson, Mattias LU ; Trägårdh, Gun LU and Östergren, Karin LU (2006) In Desalination 195(1-3). p.160-168
Abstract
Although pre-treatment of membranes is often used to ensure the reliability of experimental data, it also has the potential to improve many aspects of membrane performance. This study investigates the influence of chemical pre-treatment and wetting on membrane flux and retention. The results show that chemical pre-treatment, with either a phosphate buffer or alkaline cleaning agents, enhances the flux and lowers the retention. Wetting at 40 degrees C after membrane cleaning increased the flux and retention, whereas wetting at 50 degrees C decreased the flux and increased the retention. No effect of pre-treatment with NaOH, at pH 9.8 or 10.4, was observed. The influence of NaCl on flux and surface contact angle was also evaluated, and... (More)
Although pre-treatment of membranes is often used to ensure the reliability of experimental data, it also has the potential to improve many aspects of membrane performance. This study investigates the influence of chemical pre-treatment and wetting on membrane flux and retention. The results show that chemical pre-treatment, with either a phosphate buffer or alkaline cleaning agents, enhances the flux and lowers the retention. Wetting at 40 degrees C after membrane cleaning increased the flux and retention, whereas wetting at 50 degrees C decreased the flux and increased the retention. No effect of pre-treatment with NaOH, at pH 9.8 or 10.4, was observed. The influence of NaCl on flux and surface contact angle was also evaluated, and pre-treatment with 0.20 M NaCl(aq) was shown to increase the flux but to have no effect on surface contact angle. The origin of the positive effect of chemical pre-treatment on membrane flux appears to lie in the ion-membrane interactions within the membrane, where time and temperature are of importance. This would explain our finding that some of the positive effects of cleaning agents and NaCl on membrane flux are quickly lost after increasing the processing temperature during pure water flux measurements. (Less)
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
temperature, pressure, pre-treatment, flux, nanofiltration
in
Desalination
volume
195
issue
1-3
pages
160 - 168
publisher
Elsevier
external identifiers
  • wos:000239850200015
  • scopus:33746299817
ISSN
1873-4464
DOI
10.1016/j.desal.2005.10.034
language
English
LU publication?
yes
id
afcba53a-0bbb-4f1d-9637-5fea9413da48 (old id 397506)
date added to LUP
2016-04-01 11:45:19
date last changed
2021-09-22 01:18:11
@article{afcba53a-0bbb-4f1d-9637-5fea9413da48,
  abstract     = {Although pre-treatment of membranes is often used to ensure the reliability of experimental data, it also has the potential to improve many aspects of membrane performance. This study investigates the influence of chemical pre-treatment and wetting on membrane flux and retention. The results show that chemical pre-treatment, with either a phosphate buffer or alkaline cleaning agents, enhances the flux and lowers the retention. Wetting at 40 degrees C after membrane cleaning increased the flux and retention, whereas wetting at 50 degrees C decreased the flux and increased the retention. No effect of pre-treatment with NaOH, at pH 9.8 or 10.4, was observed. The influence of NaCl on flux and surface contact angle was also evaluated, and pre-treatment with 0.20 M NaCl(aq) was shown to increase the flux but to have no effect on surface contact angle. The origin of the positive effect of chemical pre-treatment on membrane flux appears to lie in the ion-membrane interactions within the membrane, where time and temperature are of importance. This would explain our finding that some of the positive effects of cleaning agents and NaCl on membrane flux are quickly lost after increasing the processing temperature during pure water flux measurements.},
  author       = {Nilsson, Mattias and Trägårdh, Gun and Östergren, Karin},
  issn         = {1873-4464},
  language     = {eng},
  number       = {1-3},
  pages        = {160--168},
  publisher    = {Elsevier},
  series       = {Desalination},
  title        = {The influence of different kinds of pre-treatment on the performance of a polyamide nanofiltration membrane},
  url          = {http://dx.doi.org/10.1016/j.desal.2005.10.034},
  doi          = {10.1016/j.desal.2005.10.034},
  volume       = {195},
  year         = {2006},
}