What is the difference between the ultrafiltration membrane and the reverse osmosis membrane?

Various membrane elements are used in the water treatment industry, and the more common ones are ultrafiltration membranes and reverse osmosis membranes. Both ultrafiltration membranes and reverse osmosis membranes are consumables in water treatment equipment. The pore size of the reverse osmosis membrane is only 1/100 of that of the ultrafiltration membrane, so reverse osmosis Water treatment equipment can effectively remove heavy metals, pesticides, chloroform, and other chemical pollutants in water quality. Ultrafiltration water purifiers are powerless. The ultrafiltration water purifier can remove particulate pollutants and bacteria, which can be removed by reverse osmosis.

1. The difference in properties between the ultrafiltration membrane and reverse osmosis membrane:

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The reverse osmosis membrane is an artificial semi-permeable membrane with certain characteristics made by simulating a biological semi-permeable membrane. Generally made of polymer materials. The diameter of the membrane pores is generally between 0.5 and 10 nm, and the permeability is related to the chemical structure of the membrane itself.

Ultrafiltration membrane is a kind of microporous filtration membrane with the same pore size specification and the rated pore size range of 0.001-0.02 microns. Applying proper pressure on one side of the membrane can screen out solute molecules smaller than the pore size to separate particles with a molecular weight greater than 500 Daltons (atomic mass units) and a particle size greater than 10 nanometers. The ultrafiltration membrane is one of the first polymer separation membranes developed, and the ultrafiltration device was industrialized in the 1960s.

2. Advantages and disadvantages of ultrafiltration membrane and reverse osmosis membrane:

The advantages of ultrafiltration: generally no pumps, no power consumption, no electrical safety problems; fewer joints, low water pressure, relatively low failure rate, and water leakage probability; simple structure and low price;

Disadvantages: poor effect of removing chemical pollutants in water; poor effect on special incidents of water supply; the slightly poor taste of water; unable to reduce water hardness, such as high hardness of tap water, boiling water container may become fouled.

Ultrafiltration membrane can remove macromolecules, colloids, proteins, particles, etc. in the solution, and has the characteristics of low pressure, large water production, and easy operation. By testing the treatment effect of the hollow fiber ultrafiltration membrane device for deep purification of water, it is proved that the ultrafiltration membrane water purification device can effectively eliminate the secondary pollution of water in the pipe network and further improve the water quality.

The advantages of reverse osmosis water treatment equipment: safe water quality, can effectively remove all kinds of harmful impurities in the water quality; better effect for special incidents of water supply; the better taste of water; can effectively reduce the hardness of water quality, and the boiling water container is not easy to scale;

Disadvantages: pumps, power consumption, electrical safety issues; many joints, high water pressure, relatively high failure rate, and water leakage probability; complex structure, and relatively expensive price.

3. Application range of ultrafiltration membrane and reverse osmosis membrane:

Application range of reverse osmosis membrane

Electricity, petrochemical, iron and steel, electronics, medicine, food and beverage, municipal administration and environmental protection and other fields, in the desalination of seawater and brackish water, boiler feed water, industrial pure water and electronic grade ultra-pure water preparation, drinking pure water production, wastewater treatment and The special separation process plays an important role.

Application range of ultrafiltration membrane

Pure water and ultrapure water are used as reverse osmosis pretreatment and ultrapure water terminal treatment in the preparation process; industrial water is used to separate bacteria, heat sources, colloids, suspended impurities, and macromolecular organics; drinking water, mineral water purification; fermentation, Enzyme preparation industry and pharmaceutical industry concentration, purification, and clarification; juice concentration and separation; soybean, dairy, sugar industry, wine, tea juice, vinegar, etc. separation, concentration and clarification; industrial wastewater and domestic sewage purification and recovery; Recovery of electrophoretic paint.

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Post time: Sep-24-2020


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