Determination of Membrane Mass Deposit

This method was used for UF membranes only, since these membranes separate from the support material when drying. The cake mass was measured by separating the membrane skin and accumulated cake from the membrane support after dry ing for 1.5 h at 80 C and weighed. The weight of the clean membrane skin was determined to be 17,5 0.2 mg for a 15.2 10 m- membrane area. 

Mass of cake accumulated was determined under selected suspension conditions in separate runs. This involved cessation of the experiment after passage of a known volume of permeate, followed by careful removal of the liquid above the cake and determination of the cake mass. 

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