Transport measurements of selected fluids through porous membranes provide information on precise statistical
moments of the membrane pore-size distribution (PSD). It is assumed that membrane porosity, ~T,is
distributed on different pores sizes which are statistically distributed. Mean pore sizes are determined on the
basis of statistical moment analysis. This paper focuses in the special case of determining PSD in microfiltration
(MF) membranes from a collectíon of experíments that include porosity and bubble point determinations
and liquid and gas permeations.
The separation of metals from aqueous streams by continuous polyrner enhanced ultrafiltration (PEUF) was modelled
in order to understand, evaluate and optimise the feasibility of the process. The mathematical model developed
has three sections: mass balances, equilibriurn of rnetal-polymer complexation and rules for UF membrane
separation. On the one hand, the modeJ allows an examination of the influence of physico-chernical variables
(affinity between the metal ion and the complexing polyrner groups) and engineering parameters (rnainly expended
acid and base reagents, amount of polymer used and recyc1ing strearn flow) on the quality and productivity
of the treated water stream. On the other band, a' suitable representation of the simulation results has been
shown to be helpful in choosing operation pararneter values that Iead to the stable output oftreated water with the
desired quality and productivity.