Membrane Systems
Principle: The osmosis is a physical process of the concentration equilibrium of two liquids of different ion concentrations. This exchange take place via semi-permeable membranes. Their physical properties are limited largely to the size of water molecules. The ions of these liquids are balanced out only until no other natural ion exchange occurs, or on the more concentrated side a pressure is built up, the so-called osmotic pressure. The ions exchange in a gradient from the high concentrated to low concentrated Side.