What is ultrafiltration membrane equipment?

Author: Hongjie Water 

Ultrafiltration membranes have strong filtration and purification treatment effects, mainly used to intercept harmful substances in water while maintaining the pH value of the produced water unchanged.Ultrafiltration can effectively remove large proteins, bacteria, and similar substances. If you want to remove calcium and magnesium ions, it is recommended to use nanofiltration membranes or reverse osmosis membranes.

Membrane treatment can generally be divided into ultrafiltration, nanofiltration, and reverse osmosis.The ultrafiltration membrane you are referring to generally has a pore size of 0.1-0.01um and a molecular weight of 10 to 300000.The diameter and molecular weight of calcium and magnesium ions are much smaller than this value.Therefore, it is necessary to pass through the ultrafiltration membrane.

1. The concept of ultrafiltration

The process of using ultrafiltration membranes with a pore size of 1.0-20.0nm or larger to filter solutions containing large molecules or fine particles, and separating them from the solution, is called ultrafiltration.

2. Characteristics of ultrafiltration

Similar to reverse osmosis, the driving force of ultrafiltration is also the pressure difference, which pressurizes the solution side to separate the solvent through the membrane. Unlike reverse osmosis, during the ultrafiltration process, small molecule solutes will pass through the ultrafiltration membrane together with the solvent.

3. The essence of ultrafiltration

The essence of ultrafiltration is sieving, the adsorption and blockage of particles within the micropores on the membrane surface. Ultrafiltration membrane is an asymmetric membrane with a surface active layer with a pore size of 10-9-2 × The 10-8m micropores can intercept large molecules and colloidal particles with a relative molecular weight of over 500, and the pressure difference used is 0.1-0.5MPa. However, ultrafiltration reverse osmosis membranes can remove scaling cores such as colloids in water, which can to some extent reduce the degree of scaling.

4. Advantages of ultrafiltration membranes

Due to severe water source pollution and secondary pollution, it is difficult to achieve deep purification of drinking water using ordinary filtering media.The ultrafiltration membrane purification technology adopts a high-precision pure physical filtration principle, without adding any chemical substances. It relies on the dense micropores on the surface of the ultrafiltration membrane for screening, thereby intercepting harmful substances and achieving the effect of filtration purification and purification.

Due to various reasons, the development of membrane technology and large-scale production have made the performance of ultrafiltration membranes more stable.