RO (Reverse Osmosis) is a membrane process that uses the selectivity of RO membrane, uses the static pressure difference between the two sides of the membrane as the driving force, overcomes the osmotic pressure of the solvent (usually water), allows the solvent to pass through and intercept ionic substances, and separates the liquid mixture. There are two necessary conditions for the RO separation process: first, the applied pressure must be greater than the osmotic pressure of the solution (the operating pressure is generally 1.5~10.5MPa); Second, there must be a semi-permeable membrane with high water permeability and high selectivity. The micropore size of RO membrane surface is generally less than 1nm, and it has a high removal rate for most inorganic salts, dissolved organic compounds, dissolved solids, organisms and colloids.
