What is ultrafiltration membrane?
Ultra-filtration membrane, is a very small membrane pore, membrane pore range of 0.001-0.02 micron microporous filtration membrane. In the membrane shift to apply appropriate pressure, can sieve smaller solute molecules to separate molecular weight greater than 500 Dalton, molecular weight greater than 2 ~ 20 nanometer particles. Ultrafiltration membrane is one of the earlier development of polymer separation membrane, in the 1960s ultrafiltration device was industrialized.
The industrial application of ultrafiltration membrane is very wide, has become one of the new chemical unit operations. Used for separation, concentration, purification of biological products, pharmaceutical products and the food industry; also used for blood treatment, wastewater treatment and ultrapure water preparation in the terminal treatment device. In the chronic has successfully utilized ultrafiltration membrane for the concentration and purification of Chinese herbal medicine. The progress of ultrafiltration membrane conversion technology, its screening function will be improved and strengthened, the contribution of human society will be more and more.
What is the role of ultrafiltration membrane
Using ultrafiltration membrane to pressure difference as the driving force of the membrane filtration method for ultrafiltration membrane filtration, and its field of application is expanding. The ultrafiltration membrane earlier dealt with the separation of solutes in solution and thickening, or other separation techniques used by the ultrafiltration membrane can be referred to as a flat membrane, membrane membrane, tubular membrane or hollow fiber membrane and other forms of membrane, widely used in the pharmaceutical industry, the food industry, environmental engineering and so on.
Structural characteristics of ultrafiltration membrane:
Ultrafiltration membrane can be divided into symmetric and asymmetric according to the structure of the symmetric structure of the ultrafiltration membrane is isotropic, there is no cortex, all the directions on the corresponding are the same, belongs to the deep filtration; and has a denser surface layer and the main contraction to the finger-like structure, the surface thickness of the layer 0.1 microns. Slender and small, and has the distribution of the order of the microporous, volume thickness of 200 ~ 250 microns, belongs to the surface layer filtration. Industrial use of ultrafiltration membrane is generally asymmetric membrane.
Ultra-filtration membrane applications:
1, tap water purification, aseptic purification of water supply system, residential district or residential unit water supply purification device filtration.
2, groundwater, surface water, well water turbidity and sterilization treatment.
3, instead of sand filtration, activated carbon and other traditional filtration methods, large reverse osmosis membrane device pretreatment.
4, can be used to remove the ion exchange resin treatment method can not remove the particles, suspended solids.
5, food, medical field of the processing water turbidity sterilization, refining.
6, to GB8978-1996 secondary drainage water reuse, secondary treatment of domestic sewage water reuse.
7, general engineering drainage depth treatment.
8, coal reinjection water purification treatment.
9, fruit juice beverage refining and wine clarification, Chinese medicine extract turbidity removal refining.
10, seawater desalination project pre.