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Ultrafiltration with a microfiltration membrane of acid skimmed and fat-enriched milk coagula: hydrodynamic, microscopic and rheological approaches

Published online by Cambridge University Press:  01 June 2009

Hamadi Attia ,
Michel Bennasar ,
Alain Lagaude ,
Bernard Hugodot ,
Jacques Rouviere  and
Blas Tarodo De La Fuente
Hamadi Attia
Affiliation:
Université de Montpellier II, 34095 Montpellier Cedex 5, France
Michel Bennasar
Affiliation:
Université de Montpellier II, 34095 Montpellier Cedex 5, France
Alain Lagaude
Affiliation:
Université de Montpellier II, 34095 Montpellier Cedex 5, France
Bernard Hugodot
Affiliation:
Université de Montpellier II, 34095 Montpellier Cedex 5, France
Jacques Rouviere
Affiliation:
Université de Montpellier II, 34095 Montpellier Cedex 5, France
Blas Tarodo De La Fuente
Affiliation:
Université de Montpellier II, 34095 Montpellier Cedex 5, France
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Summary

The effect of acidification method (microbiological with or without renneting, HCl addition) on mass transfer, fouling structure and the rheology of the retentate was studied in the ultrafiltration of skim milk coagula using a mineral microfiltration membrane. The increase in fouling with time appeared to determine permeate flow rates, which were higher in biological coagula, and the protein retention rates which were higher in chemical coagula. Fouling was investigated using scanning electron microscopy. The rheological study showed that at the same total solids, biological coagula were more viscous than chemical coagula. The initial coagula (total solids 97 g/kg) all displayed pseudoplastic behaviour at low shear velocities and Newtonian behaviour at high velocities. Ultrafiltration of fat-enriched milk coagulum to a dry weight corresponding to a soft cheese (total solids 334 g/kg; fat in total solids 60%) gave satisfactory permeate flow rates and protein retention rates. Performance was related to the composition of the product, the hydrodynamic parameters used and the resulting fouling. The rheological study showed that the initial coagulum behaved as a pseudoplastic body at low shear rate and for higher velocities as a Newtonian liquid. The concentrated retenate behaved as an ideal viscoplastic body (Bingham body).

Type
Original Articles
Information
Journal of Dairy Research , Volume 60 , Issue 2 , May 1993 , pp. 161 - 174
Copyright
Copyright © Proprietors of Journal of Dairy Research 1993

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