The unsteady-state modelling of cross-flow microfiltration

✍ Scribed by J.W. Hunt; C.J. Brouchaert; J.D. Raal; K. Treffry-Goatley; C.A. Buckley

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 382 KB
• Volume: 64
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(87)90115-9

✦ Synopsis

Cross

-flow microfiltration is a filtration technique in which the continuous build-up of filter cake is avoided by pumping a slurry through a porous hose or tube. The filtrate permeates through the walls of the hose and the cake which develops on the inside of the walls is continuously scoured away by the slurry. In a previously presented work, a four parameter mathematical model of the cross-flow microfiltration was described. This enabled the effects of slurry concentration, pressure, slurry flow rate and tube diameter in the steady-state flux of the filter to be quantified. In this paper the transient behaviour of a cross-flow microfiltration system is examined. Two separate mechanisms are needed to explain the way filtrate flux changes with time : a relatively rapid change due to the change in the cake thickness and a gradual flux decline due to decreasing cake permeability.