ultrafiltraation
Ultrafiltration is a membrane filtration process that separates particles in a liquid by size using semipermeable membranes. Operated in the ultrafiltration range, the membranes have pore sizes roughly from 1 to 100 nanometers and molecular weight cutoffs typically in the 10 to 1000 kilodalton range. Water and small solutes pass through the membrane, while macromolecules such as proteins, polysaccharides, and colloidal particles are retained, enabling concentration or clarification of feeds.
Ultrafiltration is usually driven by pressure; in water and beverage applications this is called cross-flow filtration,
Membranes used for ultrafiltration are primarily polymeric, including polysulfone, polyethersulfone, cellulose acetate, polyvinylidene fluoride and polyamide,
Applications span water treatment (clarification and removal of colloids, bacteria, and some viruses), dairy and food
Challenges include membrane fouling from organic matter, biofilms, and mineral scaling. Pretreatment, optimal operating conditions, and