Utilization of ultrafiltration for the treatment of whey is increasing in the world dairy industry, due to the progress made in membrane technology itself and a better knowledge of the behaviour of whey components. Pretreatment of whey either by heating accompanied or not with pH adjustment or by ionic strength regulation or by prefiltration has the greatest effect on permeation rate. Preconcentration of whey also improves performances of ultrafiltration equipment. Two new potentialities for whey proteins, made possible by properties of new membranes are also presented.
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