UF – Ultrafiltration

Ultrafiltration (UF) is a variety of membrane filtration in which hydrostatic pressure forces a liquid against a semipermeable membrane. Suspended solids and solutes of high molecular weight are retained, while water and low molecular weight solutes pass through the membrane. This separation process is used in industry and research for purifying and concentrating macromolecular (103 – 106 Da) solutions, especially protein solutions. Ultrafiltration is not fundamentally different from microfiltration or nanofiltration, except in terms of the size of the molecules it retains. Mostly, ultrafiltration is applied in cross-flow mode and separation in ultrafiltration undergoes concentration polarization.

Applications

  • Dialysis and other blood treatments
  • Concentration of milk before making cheese
  • Fractionation of proteins
  • Clarification of fruit juice
  • Recovery of vaccines and antibiotics from fermentation broth
  • Laboratory grade water purification
  • Wastewater treatment
  • Drinking water disinfection (including removal of viruses)
  • Removal of endocrines and pesticides combined with Suspended Activated Carbon pretreatment

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