Ultrafiltration (UF) is a low pressure (5-150 psig) process for separating larger sized solutes from aqueous solutions by means of a semi-permeable membrane.

  • Retains oils, particulate matter, bacteria and suspended solids large macromolecules and proteins
  • Passes most surfactants, water, acid and alkaline compounds
  • Pore sizes ranging from 0.005 – 0.1 micron; 1K – 500K MWCO
  • Permeate is clear (non-turbid) solution void of suspended solids

Industrial applications are designed for crossflow separation, where a feed stream is introduced into the membrane element under pressure and passed over the membrane surface in a controlled flow path. A portion of the feed passes through the membrane and is called permeate. The rejected materials are flushed away in a stream called the concentrate. Crossflow membrane filtration uses a high cross flow rate to enhance permeate passage and reduce membrane fouling.