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Study of the fouling of inorganic membranes by acidified milks using scanning electron microscopy and electrophoresis. II. Membrane with pore diameter 0·8 μm

  • Hamadi Attia (a1), Michel Bennasar (a1) and Blas Tarodo De la Fuente (a1)

Summary

The functioning of an inorganic microfiltration membrane (Membralox-SCT) with an average pore diameter of 0·8 μm, used for processing milk, acidified milk and lactic coagulum, was studied using dynamic and static conditions. Milk processing (pH 6·62) gave acceptable rates of protein retention but at low flow rates. Study of the effect of operating parameters during microfiltration of coagulum led to determination of optimal operating conditions leading to satisfactory performance and adequate retention rate. The results are explained using a model of the formation and development of internal and external fouling of a mineral membrane. Observations using scanning electron microscopy related to the pH of milk were used to verify the model by showing that internal fouling occurred only when the pH was higher than 5·50. This internal fouling was closely linked with the physicochemical state of milk proteins. Indeed, the fouling particles visualized at the alumina grains of the membrane support changed progressively from individual micelles (pH 6·62) to a chain or clustered structure (pH 5·60). Electrophoretic study confirmed this observation and showed that casein was present in milk permeates (pH 6·62) but not in coagulum permeates (pH 4·40).

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Attia, H., Bennasar, M. & Tarodo de la Fuente, B. 1988 [Ultrafiltration on a mineral membrane of biologically or chemically acidified milks (with varying pH) and of lactic coagulum.] Lait 68 1332
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Gillot, J. & Garcera, D. 1984 [New ceramic filter media for crossflow microfiltration and ultrafiltration.] Proceedings, FILTRA 84 Congress, pp. 161172. Paris: Société Française de Filtration
Vétier, C., Bennasar, M. & Tarodo de la Fuente, B. 1986 [Study of the interactions between milk constituents and mineral membranes for microfiltration.] Lait 66 269287
Vétier, C., Bennasar, M. & Tarodo de la Fuente, B. 1988 Study of the fouling of a mineral microfiltration membrane using scanning electron microscopy and physicochemical analyses in the processing of milk. Journal of Dairy Research 55 381400

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