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Influence of shear rate on the flux during ultrafiltration of colloidal substances

Jönsson, Ann-Sofi LU (1993) In Journal of Membrane Science 79(1). p.93-99
Abstract
The shear rate at the surface of a membrane has a distinct influence on the membrane flux in systems containing colloidal substances. If the shear rate is decreased, flux decreases since the thickness of the boundary layer of retained solutes at the membrane surface then increases. When low molecular solutes are used, flux increases again when the shear rate is increased. However, if large solutes are used, polymeric and colloidal substances, for example, it sometimes happens that the flux cannot be increased to its original value again by increasing the shear rate: the flux decline is regarded as irreversible. Experiments, performed in a new type of turbulence-promoting module, which illustrate the influence of shear rate on flux when... (More)
The shear rate at the surface of a membrane has a distinct influence on the membrane flux in systems containing colloidal substances. If the shear rate is decreased, flux decreases since the thickness of the boundary layer of retained solutes at the membrane surface then increases. When low molecular solutes are used, flux increases again when the shear rate is increased. However, if large solutes are used, polymeric and colloidal substances, for example, it sometimes happens that the flux cannot be increased to its original value again by increasing the shear rate: the flux decline is regarded as irreversible. Experiments, performed in a new type of turbulence-promoting module, which illustrate the influence of shear rate on flux when treating solutions containing colloidal substances, are presented in this paper. It is also shown that a flux decrease which can not be restored by increasing the shear rate, may be completely restored by a temporary interruption of the permeate flow. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ULTRAFILTRATION, FOULING, PLANT EFFLUENT, WASTE WATER, TURBULENCE, PROMOTION
in
Journal of Membrane Science
volume
79
issue
1
pages
93 - 99
publisher
Elsevier
external identifiers
  • wos:A1993KZ66100008
  • scopus:0027574959
ISSN
0376-7388
DOI
10.1016/0376-7388(93)85020-W
language
English
LU publication?
yes
id
c659d34a-8fae-4562-bb54-5cb2b9b242ac (old id 3915569)
date added to LUP
2013-07-02 10:02:48
date last changed
2017-08-06 04:39:07
@article{c659d34a-8fae-4562-bb54-5cb2b9b242ac,
  abstract     = {The shear rate at the surface of a membrane has a distinct influence on the membrane flux in systems containing colloidal substances. If the shear rate is decreased, flux decreases since the thickness of the boundary layer of retained solutes at the membrane surface then increases. When low molecular solutes are used, flux increases again when the shear rate is increased. However, if large solutes are used, polymeric and colloidal substances, for example, it sometimes happens that the flux cannot be increased to its original value again by increasing the shear rate: the flux decline is regarded as irreversible. Experiments, performed in a new type of turbulence-promoting module, which illustrate the influence of shear rate on flux when treating solutions containing colloidal substances, are presented in this paper. It is also shown that a flux decrease which can not be restored by increasing the shear rate, may be completely restored by a temporary interruption of the permeate flow.},
  author       = {Jönsson, Ann-Sofi},
  issn         = {0376-7388},
  keyword      = {ULTRAFILTRATION,FOULING,PLANT EFFLUENT,WASTE WATER,TURBULENCE,PROMOTION},
  language     = {eng},
  number       = {1},
  pages        = {93--99},
  publisher    = {Elsevier},
  series       = {Journal of Membrane Science},
  title        = {Influence of shear rate on the flux during ultrafiltration of colloidal substances},
  url          = {http://dx.doi.org/10.1016/0376-7388(93)85020-W},
  volume       = {79},
  year         = {1993},
}