【Introduction】

Reverse osmosis technology is the world's most advanced, most effective membrane separation technology, using reverse osmosis technology can effectively remove dissolved solids, organics, colloids, microorganisms and bacteria and other impurities. With pollution-free, advanced technology, easy operation, running and reliable. Therefore, reverse osmosis water treatment technology in the food, beverage, drinking water, electronics, semiconductor, chemical and pharmaceutical, power plant, sea water, brackish water desalination, metallurgy, light industry, electroplating and leather industry has been widely used。

【Word Principle】

Through the substance of the film is called selective semipermeable membrane, generally only through the solvent and solute through the membrane can not be called an ideal semipermeable membrane. When the same volume of dilute solution (eg water), and concentrated solution (eg saline) were placed on both sides of a semipermeable membrane, the dilute solution in the solvent will naturally and spontaneously through the semipermeable membrane on one side to the concentrated solution flow This phenomenon is called infiltration. When the osmotic balance, the concentrated solution side of the surface will be higher than the dilute solution of liquid a certain height, that the formation of a pressure, this pressure is the osmotic pressure.Osmotic pressure depends on the inherent nature of the solution, ie the solution type, concentration and temperature on the nature of which has nothing to do with the semi-permeable membrane. Impose a solution on one side if the pressure is greater than the osmotic pressure, the flow direction of the solvent penetration in the opposite direction with the original, starting from the concentrated solution to dilute solution side of the flow, a process called reverse osmosis. Reverse osmosis is a reverse migration of penetration, is a pressure-driven choice without the help of semi-permeable membrane interception of the solvent in the separation of solute and solvent separation method, it has been widely used for purification of various solutions And solvent reduction, the most common examples is in the water treatment process, using reverse osmosis technology to water ions, bacteria, viruses, organic matter and colloid and other impurities in order to obtain high-quality pure water。