Hydrophilic membrane is a kind of ultrafiltration membrane, you can filter some of the harmful substances in water, this film can be filtered under a small pressure of water.
Ultrafiltration membrane principle: ultrafiltration is a membrane pore size associated with the sieving process to the pressure on both sides of the membrane as the driving force to the ultrafiltration membrane as a filter medium, under a certain pressure, when the liquid flow through the surface , The ultrafiltration membrane surface of many small pores only allow water and water molecules through the liquid and through the liquid, and the liquid in the body of the membrane surface of the microporous material is trapped in the membrane on the liquid side, as a concentration Liquid, thus achieving the purpose of purification, separation and concentration of the stock solution.
The structure of the ultrafiltration membrane is symmetrical and asymmetric. The former is isotropic, no cortex, all directions of the pores are the same, belonging to the deep filter; the latter has a more dense surface and finger-based structure of the bottom, the surface thickness of 0.01 microns or less, And has a row of ordered micropores, the bottom thickness of 200 to 250 microns, belonging to the surface filtration. Industrial use of ultrafiltration membrane is generally asymmetric membrane. The membrane material of the ultrafiltration membrane is mainly cellulose and its derivatives, polycarbonate, polyvinyl chloride, polyvinylidene fluoride, polysulfone, polyacrylonitrile, polyamide, polysulfone amide, sulfonated polysulfone, Polyvinyl alcohol, modified acrylic polymers, and the like.
Non-hydrophilic ultrafiltration membrane, in the filtration of the mass transfer process, colloid, oil, protein and other pollutants into a cake-like surface attached to the membrane, through a simple backwash difficult to clean, non-hydrophilic film operating pressure High and high frequency of chemical cleaning;
The hydrophobic ultrafiltration membrane in the filtration of the mass transfer process, colloid, oil, protein and other pollutants in the membrane surface agglomerate into a spherical shape, this spherical aggregates, it is easy to detach from the membrane surface, through a simple anti Wash can be cleaned, hydrophilic ultrafiltration membrane operating pressure is low and chemical cleaning frequency is low.
Hydrophilic ultrafiltration membrane chemical cleaning cycle is relatively long, chemical cleaning recovery is better, in each chemical cleaning cycle, backwash after the flux recovery close to 100%; non-hydrophilic ultrafiltration membrane chemical cleaning cycle is short, The flow rate of backwash after each chemical wash cycle is only 80-90%; therefore, in the water treatment project, the hydrophilic ultrafiltration membrane than the non-hydrophilic ultrafiltration membrane has obvious advantages, Life, well maintained in a stable flow - design flow.