Classification and application of reverse osmosis membrane in water treatment technology
The principle of membrane separation technology in reverse osmosis equipment is generally divided into the following categories:
1) Semi-permeable membrane: A membrane that allows only solvent molecules to pass through without allowing the molecules of the solute to pass is called an ideal semi-infiltration.
2) Permeation: Under the same external pressure, when the solution is separated from the pure solvent by a semipermeable membrane, the phenomenon that the pure solvent is thinned by the solution through the semipermeable membrane is called infiltration.
3) Permeation balance: During the permeation process, the number of solvent molecules passing through the semi-permeable membrane from two opposite directions is equal to each other, that is, the osmotic equilibrium is reached.
4) Osmotic pressure: When the semipermeable membrane separates the solution from the pure solvent, the additional pressure applied to the original solution to prevent the pure solvent from entering the solution is called the osmotic pressure. Generally, the thicker the solution, the greater the osmotic pressure of the solution.
5) Reverse osmosis equipment: If the pressure applied to the solution exceeds the osmotic pressure, the solvent in the solution flows toward the pure solvent. This process is called reverse osmosis.