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What is the difference between ultrafiltration and microfiltration?(1)

Sep 22, 2017

Ultrafiltration (microfiltration) and microfiltration (microfiltration) is also a pressure difference as the driving force of the membrane separation process, generally used for liquid separation, can also be used for gas separation, such as air bacteria and particles removed.

The membrane used for ultrafiltration is an asymmetric membrane with an average pore size of about 10 to 200 A, and capable of retaining macromolecules and colloidal particles having a molecular weight of 500 or more. The operating pressure is 0.1 to 0.5 MPa.

The raw material liquid under the action of differential pressure, in which the solvent through the membrane on the micropores flow to the low side of the membrane for the liquid, macromolecules or colloidal particles trapped, can not pass through the membrane,

So as to realize the separation of macromolecular substances and colloidal substances and solvents in the raw material liquid. The retention mechanism of the ultrafiltration membrane to the macromolecular substance is mainly the screening effect, and the effect of the interception effect is mainly on the pore size and shape of the surface active layer of the membrane.

In addition to sieving, the membrane surface, the adsorption within the pores and the retention of particles in the membrane pores also allow the macromolecules to be trapped. Practice has proved that, in some cases, the physical and chemical properties of membrane surface on the ultrafiltration separation has an important impact, because the ultrafiltration treatment of macromolecular solution, the solution osmotic pressure on the process of impact. In this sense, it is similar to reverse osmosis.

in addition to washing with warm water, but also regular use of industrial alcohol cleaning; membrane treatment of domestic sewage often use sodium hypochlorite solution. If you have ready-made information, the cleaning formula and cleaning cycle to be determined by experiment.

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