Two-scale modelling of concentration polarization in a reverse osmosis membrane

Palacin, L. G., Theodoropoulos, C., Weiguo, X., Tadeo, F. and de Prada, C. (2012). Two-scale modelling of concentration polarization in a reverse osmosis membrane. In: Proceedings FOCAPO / CPC VIII 2012. 2012 Joint Conference: Foundations of Computer-Aided Process Operations (FOCAPO) and Chemical Process Control (CPC) VIII, Savannah, GA, United States, (). 11-13 January 2012.

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Author Palacin, L. G.
Theodoropoulos, C.
Weiguo, X.
Tadeo, F.
de Prada, C.
Title of paper Two-scale modelling of concentration polarization in a reverse osmosis membrane
Conference name 2012 Joint Conference: Foundations of Computer-Aided Process Operations (FOCAPO) and Chemical Process Control (CPC) VIII
Conference location Savannah, GA, United States
Conference dates 11-13 January 2012
Proceedings title Proceedings FOCAPO / CPC VIII 2012
Place of Publication Madison, WI, United States
Publisher Omnipress
Publication Year 2012
Sub-type Fully published paper
Total pages 7
Collection year 2013
Language eng
Abstract/Summary In the design and control of reverse osmosis desalination plants, the clean water flux, which passes through the membranes, is the most important variable. Flux depends on several parameters, such as the membrane permeability or the temperature, but mainly on the salt concentration on the membrane surface. The salt concentration is easily measured in the bulk of the feed, but not on the membrane surface, where it should be estimated. The concentration polarization creates an unwanted increase of the salt concentration between the bulk side and the membrane surface. The polarization effect is due to the convective transport of salt molecules by the water flow to the boundary layer of the membrane, and their subsequent blockage by the membrane itself. A correct estimation of the concentration polarization is fundamental to predict the clean water flux, and finally, to be able to carry out a good design and control of the desalination plant. Several models have been proposed in the literature to calculate the concentration polarization (or the salt concentration on the membrane surface). This paper presents a new model, which aims to solve some of the disadvantages of the previous models.
Keyword Two-scale modelling
Dynamic modelling
Brownian motion
Reverse osmosis desalination
Concentration polarization
Q-Index Code EX
Q-Index Status Confirmed Code
Institutional Status Non-UQ
Additional Notes CPC Contributed papers

Document type: Conference Paper
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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Created: Mon, 23 Jul 2012, 09:29:20 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre