KENT RO Systems

Reverse Osmosis (RO) is a filtration method that removes many types of large molecules and ions from water by applying pressure when it is on one side of a selective membrane. The result is that the solute is retained on the pressurized side of the membrane and the pure water is allowed to pass to the other side. To be "selective," this membrane should not allow large molecules or ions through the pores (holes), but should allow smaller components of the solution to pass freely.

Reverse Osmosis is most commonly known for its use in drinking water purification, and helps in removing the salt and other substances from the water molecules. This is the reverse of the normal Osmosis process, in which the solvent naturally moves from an area of low solute concentration, through a membrane, to an area of high solute concentration. The movement of a pure solvent to equalize solute concentrations on each side of a membrane generates a pressure and this is the "osmotic pressure." Applying an external pressure to reverse the natural flow of pure solvent, thus, is Reverse Osmosis.

The process is similar to membrane filtration. However, there are key differences between Reverse Osmosis and filtration. The predominant removal mechanism in membrane filtration is straining, or size exclusion, so the process can theoretically achieve perfect exclusion of particles regardless of operational parameters such as influent pressure and concentration. Reverse Osmosis, however, involves a diffusive mechanism so that separation efficiency is dependent on solute concentration, pressure, and water flux rate.