Ultrafiltration is a separation process that utilizes a microporous screening mechanism of a pressure activated membrane to retain colloids, particles, and substances with relatively high amounts of solutes in water under external driving forces (pressure), while water and small solute particles pass through the membrane. Materials with a molecular weight of 3x10000-1x10000 can be intercepted through the screening of micropores on the membrane surface. When the treated water passes through the membrane surface at a certain flow rate with the help of external pressure, water molecules and solutes with a water treatment particle size of less than 300-500 pass through the membrane, while particles and macromolecules larger than the membrane pores are intercepted due to sieving, thus purifying the water. After passing through the ultrafiltration membrane, most of the colloidal silicon in the water can be removed, and a large amount of organic matter can also be removed. Ultrafiltration equipment can effectively remove impurities such as suspended solids, colloids, organic macromolecules, bacteria, microorganisms, etc. from water. Due to its excellent filtration performance, ultrafiltration is widely used in various water treatment systems.