Ultrafiltration, like other membrane treatments, separates contaminants such as colloids, suspended solids (TSS), organic and inorganic polymeric molecules, bacteria and viruses from water. The operation of ultrafiltration with lower pressure than reverse osmosis systems and the larger pore diameters distinguish the systems from each other.
In UF systems, the feed water pump provides the pressure force required to push the water into the membrane fiber. It allows ultrafiltration membranes to operate at relatively low pressures with their high permeability and negligible osmotic effects. Hollow fiber as membrane open foam structure offers low resistance and strength structure. The benefit of such a structure is that it allows backwashing of the membrane when the permeate or product flow decreases due to material build-up on the membrane surface. It provides good treatment efficiency in the long term by means of back-washable membrane modules.