Actually, it's not that it's good or bad. Each has its own advantages and disadvantages, and the one that suits you is the best. When choosing a filtration membrane, you should choose it according to your own needs and water quality. The key points of selecting filtration membrane are: desalination rate, water flux, minimum operating pressure, operating temperature, water inflow requirements, etc.
Characteristics of reverse osmosis membrane:
The water produced by reverse osmosis membrane is of good quality and can remove heavy metals, microorganisms, pesticides and various harmful substances from water. The diameter of surface micropores is generally between 0.5- 10nm, and substances larger than 0.000 1 micron can be retained. It has the advantages of good anti-pollution, high water yield, stable operation, high desalination rate, long service life and little influence by factors such as pH value and temperature.
Characteristics of ultrafiltration membrane:
The average pore size of ultrafiltration membrane is between 3- 100nm. Ultrafiltration membrane can intercept most of suspended solids and colloids in water, but it can't remove soluble small molecules. It has the characteristics of simple structure, low price, relatively low failure rate and leakage probability, low operating pressure, simple equipment and small occupied area. It has the functions of purifying, separating and concentrating solutions, and is generally used in electronics, medicine, electrophoretic paint, beverages, etc.
What is the difference between reverse osmosis membrane and ultrafiltration membrane?
1. The water consumption of reverse osmosis membrane is relatively large, and the ratio with ultrafiltration membrane is about 3: 1.
2. The filter element of reverse osmosis membrane has high cost and complicated manufacturing process, so the price is higher than that of ultrafiltration membrane.
3. The filtration accuracy of reverse osmosis membrane is much better than that of ultrafiltration membrane, but it will also filter out some substances beneficial to human body. Although ultrafiltration membrane has low filtration accuracy and can retain some substances beneficial to human body, ultrafiltration membrane can not remove chemical pollutants such as heavy metals, pesticides and chloroform in water.
4. The standard of reverse osmosis membrane is higher. The qualified standard of ultrafiltration membrane is 0/00 colonies per milliliter of water, while that of reverse osmosis membrane is 20 colonies per milliliter of water. It can be said that the standard of reverse osmosis membrane is four times that of ultrafiltration membrane.
5. Ultrafiltration membrane does not need electricity, so there is no electricity safety problem, low cost and simple structure, while reverse osmosis membrane needs water pump and electricity, with relatively high failure rate and water leakage probability and complex structure.