Main factors affecting ultrafiltration membrane (UF)

What is a ultrafiltration membrane?

Ultrafiltration membrane is a kind of filtration between microfiltration and nanofiltration, and is a membrane separation technology suitable for material separation, concentration and purification. It is generally characterized by molecular weight cutoff in practical applications, as long as it is used to separate macromolecules, colloids and particles in solution from small molecules such as solvents. The macromolecules, colloids and particles are trapped on the surface of the membrane, and the concentrated solution is carried away by the circulating flow of materials, so as to achieve the purpose of material separation, concentration and purification. The application fields of ultrafiltration mainly involve food, beverage, biomedicine, fine chemical industry, industrial wastewater treatment and reuse, etc. The application of ultrafiltration technology has taken a dominant position in the juice clarification process. The freshly squeezed juice contains pectin, pulp scraps, starch, protein, suspended solids, microbial metabolism and other substances that make the juice turbid.

The main factors that affect the ultrafiltration membrane (UF) should be noted:

  • The filtration rate (ie flux) is related to the concentration of the solution.
  • Solutes with small molecular weight are filtered quickly, and long-chain molecules are easier to pass through the membrane than spherical molecules.
  • When the temperature increases, the flux is large, but it cannot exceed the rated temperature. (The solute of polysulfone ultrafiltration membrane should not exceed 50℃).
  • The high flow rate of the material liquid is the large flux.
  • Increasing the pressure of extremely dilute solutions (such as water) can increase the flux, but it cannot exceed the rated pressure.
  • When the PH value is close to the isoelectric point of the solute, the flux is low.
  • In the mixed solution, macromolecular substances may form secondary (concentration polarization) on the membrane surface, which will affect the passage of small molecular solutes. Reduce flux.

Xi’an CHIWATEC Water Treatment Technology is a high-tech enterprise specialized in various water processing devices. Aside from these individual products, which cover a number of types and series, we can also help with related comprehensive engineering projects. Thanks to our hard work and dedication upon our founding, we are now one of the fastest-developing water treatment equipment manufacturers in Western China.

Further reading:

Inside-out PS UF Membrane

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