A fouling model for steady state crossflow membrane filtration considering sequential intermediate pore blocking and cake formation

A generalized theory has been proposed for a crossflow membrane filtration process, comprising of intermediate pore blocking followed by cake formation, in sequence. A phase space plot has been generated to identify the three filtration domains namely, pore blocking dominant, comparable resistances and cake dominating process. It is found that the crossflow velocity (in terms of steady state flux) has significant effect on the onset of the cake formation. It is observed that the intermediate pore blocking has very narrow region of dominance, so most experimental data are likely to lie in the cake controlling region. The operator can effectively control the characteristics of filtration by changing the crossflow velocity and transmembrane pressure.

Figure optionsDownload as PowerPoint slideResearch highlights▶ The region of relative pore blocking dominance with respect to cake resistance has been theoretically determined. ▶ The resistance in series model considering sequential intermediate pore blocking and cake formation can very well predict the actual crossflow membrane scenario. ▶ The control of the ultrafiltration and microfiltration process can be effectively controlled by the handling the steady state process parameters as featured in the article.