Ultrafiltration is used for the separation of suspended solids, colloids, bacteria and virus. This technique uses membranes with pore size between 1-100nm.
* MWCO = molecular weight cut-off
There are 4 membranes geometries:
Comparison between the different types of geometry (Source: Water Treatment Handbook, Degrémont Suez, 7th edition):
+++: obvious advantage
There are two ultrafiltration module configurations: