Ultrafiltration (UF) membranes have pore sizes ranging from 0.1 to 0.01 µm (micrometer), placing them between microfiltration and nanofiltration membranes. UF is able to retain proteins, endotoxins, viruses and silica, allowing for a wide range of applications from wastewater treatment to pharmaceutical processes.
UF membranes are often made of polymers such as polysulfone, cellulose acetate, or polypropylene. Depending on the application and feed quality, they can be operated in dead-end or crossflow mode. In many applications, UF offers the best balance between effective treatment and cost efficiency in comparison with other membrane-based and traditional filtration methods.
Ultrafiltration delivers high productivity at low pressure and can purify, separate, and concentrate macromolecules. UF technology is used in the production of drinking water, product water and process water, and in the pre-treatment process of large seawater reverse osmosis (SWRO) plants.