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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

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Internet de l'unité STLO Science et Technologie du Lait et de l'Oeuf

STLO Research Unit

Modeling membrane processes

Filtration principle
Membrane filtration (ultra-, microfiltration) is extensively used for concentrating or separating colloidal dispersions. However, it remains unclear what factors determine the efficiency of such operations.

This is especially the case for soft, deformable and permeable colloids.

We suggest that as long as both the osmotic pressure and the hydraulic permeability are known models for prediction of the performance (flux, concentration profile) of the filtration of any colloidal dispersion, a function of the operating conditions can be established. Estimation of the hydraulic permeability for soft and permeable colloids is very difficult. We hence use a direct approach combining:

  • osmotic stress experiments with
  • a reverse-calculation approach.

Applied to dispersions of casein micelles, which represent sort of “natural” colloidal microgels, the resulting filtration model was then validated against experimental measurements taken from David et al. (2008). 


Filtration of casein mlicelles

Filtration times from bottom to top are 133, 188, 246 and 325 minutes.

Predicted (lines) and experimental (symbols) concentration profiles in dead-end filtration of casein micelles.


Our original and generic approach allows development of unique prediction tools that are missing to date. It is a step towards innovative eco-design of processes in the food industry.  




Read more

Bouchoux A., Qu P., Bacchin P., G. Gésan-Guiziou. (2014) Modeling the filtration of soft and permeable colloids: the milk case study, Langmuir 30: 22-34.

Qu P., Gésan-Guiziou G., Bouchoux A. (2012) Dead-end filtration of sponge-like colloids: the case of casein micelle, Journal of Membrane Science 417-418: 10-19.

David C., Pignon F., Narayanan T., Sztucki M., Gésan-Guiziou G., Magnin A. (2008) Spatial and temporal in-situ evolution of concentration profile during casein micelle ultrafiltration probed by small angle X-ray scattering, Langmuir, 24: 4523-4529.


Geneviève Gésan-Guiziou • Scientist in Dairy Processing team

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