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Study of the fouling of inorganic membranes by acidified milks using scanning electron microscopy and electrophoresis. I. Membrane with pore diameter 0·2 μm

Published online by Cambridge University Press:  01 June 2009

Hamadi Attia ,
Michel Bennasar  and
Blas Tarodo De La Fuente
Hamadi Attia
Affiliation:
Laboratoire de Technologie Alimentaire, Centre de Génie et Technologie Alimentaires, Groupe de Recherche et Développement sur les Membranes, Université des Sciences et Techniques du Languedoc, 34095 Montpellier Cédex 05, France
Michel Bennasar
Affiliation:
Laboratoire de Technologie Alimentaire, Centre de Génie et Technologie Alimentaires, Groupe de Recherche et Développement sur les Membranes, Université des Sciences et Techniques du Languedoc, 34095 Montpellier Cédex 05, France
Blas Tarodo De La Fuente
Affiliation:
Laboratoire de Technologie Alimentaire, Centre de Génie et Technologie Alimentaires, Groupe de Recherche et Développement sur les Membranes, Université des Sciences et Techniques du Languedoc, 34095 Montpellier Cédex 05, France
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Summary

The fouling of an inorganic microfiltration membrane with an average pore diameter of 0·2 μm obtained in static conditions with milk, acidified milk and acid coagulum was examined using scanning electron microscopy. The structure and porosity of external fouling related to the pH of the milk accounts for the performance and efficiency obtained in microfiltration. Electrophoretic analysis of permeate, characterized by lack of casein, shows that the deposit plays a fundamental role in mass transfer through filter layers. Variations in the physicochemical properties of casein as a function of pH at 50 °C were used to account for the development of the structure of fouling, which comprised three main states: (i) dense deposit of juxtaposed micelles, (ii) loose network formed by chains made up of bonded protein aggregate, (iii) irregular protein aggregate leading to high-porosity deposits. The presence of a protein film strongly adsorbed on the membrane layer of alumina particles is demonstrated.

Type
Original articles
Information
Journal of Dairy Research , Volume 58 , Issue 1 , February 1991 , pp. 39 - 50
Copyright
Copyright © Proprietors of Journal of Dairy Research 1991

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References

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