1, the function is different
Reverse osmosis, also known as reverse osmosis, a kind of pressure difference as the driving force, from the solution to separate the solvent membrane separation operation. Because it and natural osmosis in the opposite direction, it is called reverse osmosis.
Secondary reverse osmosis device is to force water molecules through the water molecules with the help of pressure through the reverse osmosis membrane has a selective permeability effect, that is, the principle of reverse osmosis water purification.
2, the role of different
According to the different osmotic pressure of various materials, you can use greater than the osmotic pressure of reverse osmosis pressure, that is, reverse osmosis, to achieve the purpose of separation, extraction, purification and concentration.
Second-level reverse osmosis device is for the reverse osmosis device according to the different osmotic pressures of various materials, can be greater than the osmotic pressure of the reverse osmosis method for separation, extraction, purification and concentration. Can remove more than 98% of the dissolved salts in water and more than 99% of the colloids, microorganisms, particles and organic matter, etc., to become a modern pure water, space water (ultrapure water) project preferred the best equipment.
3, different working principles
The separation process of secondary reverse osmosis does not require heating, there is no phase change has the advantages of low energy consumption, small equipment size, process simplicity, easy to operate and maintain, pollution-free, adaptable, wide range of applications, etc., has become one of the important methods of water treatment technology.
Reverse osmosis technology is usually used for seawater, brackish water, fresh water; water softening treatment; wastewater treatment, as well as food, pharmaceutical industry, chemical industry, purification, concentration, separation and so on.
Baidu Encyclopedia - Reverse Osmosis
Baidu Encyclopedia - Secondary Reverse Osmosis