What is ultrafiltration and how does ultrafiltration work?

Ultrafiltration is a membrane separation technology (UItrafil-tration referred to as UF). Solutions can be purified, separated or concentrated. Ultrafiltration is between microfiltration and nanofiltration, and there is no clear dividing line between the three. Generally speaking, the pore size of the ultrafiltration membrane is between 0.05 um–1 nm, and the operating pressure is 0.1–0.5 Mpa. It is mainly used to intercept and remove macromolecular substances such as suspended solids, colloids, particles, bacteria and viruses in water. Ultrafiltration membranes can be divided into organic membranes and inorganic membranes according to membrane materials. According to the appearance of the membrane, it can be divided into: flat plate, tube, capillary, hollow fiber and porous.

How does ultrafiltration work?

The work of the ultrafiltration membrane is mainly based on the screening mechanism, and the water purification process is carried out based on the working pressure and the pore size of the membrane. Taking the hollow fiber as an example, the water inlet method can be divided into external pressure type: the raw water enters from the outside of the membrane filament, and the purified water is produced from the inside of the membrane filament. On the contrary, it is an internal pressure type. The working pressure of the internal pressure type is lower than that of the external pressure type. Ultrafiltration membranes have been widely used in many fields such as advanced treatment of drinking water, industrial ultrapure water and solution concentration and separation.