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Analysis of the specific process of household water purifier filter membrane filtration
Household water purifier ultrafiltration is a screening process using membrane separation technology. The pressure difference between the two sides of the membrane is used as the driving force, and the ultrafiltration membrane is used as the filter medium. Under a certain pressure, when the raw liquid flows through the membrane surface. Many fine pores densely coated on the surface of the ultrafiltration membrane only allow water and small molecules to pass through to become permeate, and substances in the original solution having a volume larger than the pore diameter of the membrane surface are trapped on the liquid inlet side of the membrane to become a concentrate. Therefore, the purpose of purifying, separating and concentrating the raw liquid is achieved.
There are about 6 billion 0.01 micron micropores on the wall of the ultrafiltration membrane per meter. The pore size only allows the passage of water molecules, beneficial minerals and trace elements in the water, and the smallest bacteria are more than 0.02 microns. Therefore, bacteria and colloids, rust, suspended matter, sediment, macromolecular organic matter, etc., which are much larger than bacteria, can be intercepted by the ultrafiltration membrane, thereby realizing the purification process.
Household water purifier filter membrane filtration specific process
1. Water production process of ultrafiltration membrane
The tap water first enters the ultrafiltration membrane tube. Under the action of the water pressure difference, many 0.01 micron micropores densely on the surface of the membrane allow only water molecules, beneficial minerals and trace elements to pass through, and become purified water. Bacterial, rust, colloid, sediment, suspended matter, macromolecular organics and other harmful substances are trapped in the ultrafiltration membrane tube and discharged when the ultrafiltration membrane is flushed.
2, ultrafiltration membrane washing process
After using the ultrafiltration membrane for a period of time, the harmful substances such as bacteria, rust, colloid, suspended solids and macromolecular organic substances that are trapped will adhere to the inner surface of the ultrafiltration membrane, and the water production of the ultrafiltration membrane of the household water purifier will gradually decrease. Especially when the water pollution is serious, it is more likely to cause clogging of the ultrafiltration membrane. Regular washing of the ultrafiltration membrane can effectively restore the water production of the membrane.
3, ultrafiltration membrane filter
The bundled ultrafiltration membrane filament is subjected to a casting process to form an ultrafilter core as shown in the following figure. The filter cartridge is composed of an ABS shell, an epoxy seal at both ends of the shell, and a bundle of ultrafiltration membrane filaments. The epoxy seal fills the gap between the membrane filament and the membrane filament to form the separation between the original solution and the permeate. The original solution first enters the pore of the ultrafiltration membrane and is filtered by the ultrafiltration membrane to become a permeate, preventing the original solution. Directly enter the permeate without filtration.
4, the calculation of the total area of ​​the ultrafiltration membrane filter membrane of household water purifier:
In the case where the water production per unit membrane area is constant, the larger the membrane area of ​​the filter cartridge is, the more the total water production capacity of the filter element is.
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