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Ultrafiltration of defatted whey: influence of some physicochemical characteristics

Authors: G. Daufin and F. Michel


Ultrafiltration of defatted whey clarified by microfiltration has been studied using a laboratory rig and a 4-stage industrial plant equipped with M5 Carbosep inorganic membranes. Flux versus transmembrane pressure characteristics did not reveal limiting flux even at a moderate tangential flow rate of 4.5 m s-1st UF stage), irreversible fouling caused by precipitation of minerals within the membrane greatly contributed to UP performance decrease with time at natural feed pH (6.4) and up to higher pH (7.0). When the feed used was prepared with a low mineral content, proteins appeared to be less fouling (adsoption and concentration polarisation) at near neutral and alkaline pH.

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