Ultrafiltration (UF) membranes have pore sizes ranging from 0.1 to 0.01 µm (micrometer), placing them between microfiltration and nanofiltration membranes. UF is able to retain proteins, endotoxins, viruses and silica, allowing for a wide range of applications from wastewater treatment to pharmaceutical processes.

UF membranes are often made of polymers such as polysulfone, cellulose acetate, or polypropylene. Depending on the application and feed quality, they can be operated in dead-end or crossflow mode. In many applications, UF offers the best balance between effective treatment and cost efficiency in comparison with other membrane-based and traditional filtration methods. 

Ultrafiltration delivers high productivity at low pressure and can purify, separate, and concentrate macromolecules. UF technology is used in the production of drinking water, product water and process water, and in the pre-treatment process of large seawater reverse osmosis (SWRO) plants. 

The main benefits include its small footprint and consistent permeate quality, and the (almost) complete removal of pathogens.

UF is also applied in the chemical and pharmaceutical industries, food and beverage processing, and wastewater treatment. UF technology has proven to be an excellent large-scale treatment method for surface water, the effluent of wastewater treatment plants, and groundwater projects with suspended solids levels of up to 100 to 200 mg/L. 

When the normal molecular weight cut-off (MWCO) of 150 kDa to 200kDa is not sufficient, such as in the removal of colloidal silica to prepare boiler water, tight ultrafiltration (TUF) membranes offer a MWCO of 10 kDa to 20 kDa to do the job.

If you have any questions, please contact us.


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