HOLLOW-FIBER ULTRAFILTRATION OF APPLE JUICE - MACROSCOPIC APPROACH

Permeate flux in hollow fibre ultrafiltration of apple juice was model led using different approaches. The effect of flow velocity (10 15 and 20 L/min), transmembrane pressure (73.5 and 118 kPa) and molecular we ight cut-off (30,000, 50,000 and 100,000) was determined over the I to 14 range of volume concentration ratio (VCR). The Pox showed an expon ential decay behaviour operating at constant VCR and proved to be pres sure-independent at a value that increased with pow velocity and VCR. Classical pow-through filtration theory was used to model the pur depe ndence with VCR. Energy consumption during hollow fibre ultrafiltratio n of apple juice under different operating conditions was also calcula ted. It was observed that energy expenses for apple juice ultrafiltrat e increased with pow velocity and optimum value should be estimated. I nfluence in hollow fibre ultrafiltration of different enzymatic treatm ents was also considered.