Ultrafiltration of Skimmilk in Hollow Fibers

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Abstract
Flux in hollow fiber ultrafiltration of skimmilk was modelled over the entire pressure‐flux region using the resistance approach. The Hagen‐Poiseuille model was adequate to describe water flux data: effect of temperature could be largely accounted for by viscosity of permeate. To describe skimmilk data, the model was modified to include a term due to resistance of the polarized layer (RP) and RF, a resistance due to fouling by specific membrane‐solute interactions. RF was relatively independent of operating parameters, but Rp was a function of velocity and feed concentration at a particular temperature. Under typical conditions of hollow fiber ultrafiltration of skimmilk, the membrane and fouling layer appeared to contribute little resistance to flux compared to resistance of the polarized layer.

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