1: pretreatment-reverse osmosis-purified water tank-ion exchanger-ultraviolet lamp-pure water pump-water intake point
2: Pretreatment-primary reverse osmosis-secondary reverse osmosis (positive charge reverse osmosis membrane)-purified water tank-pure water pump-ultraviolet lamp-water intake point
3: pretreatment-reverse osmosis-intermediate water tank-intermediate water pump -EDI device-purified water tank-pure water pump-ultraviolet lamp-water point
4: Pretreatment → ultraviolet sterilization device → primary RO device → secondary RO device → intermediate water tank →EDI device → deoxidation device → nitrogen sealed pure water tank → TOC ultraviolet removal device → polishing mixed bed → ultrafiltration device → water point.
The water quality conforms to the American ASTM standard, and the electronic ultra-pure water quality standard (18mΩ * cm,15mΩ * cm, 2mω* cm, 0.5mω* cm).
Manufacturing technology of ultra-pure water by reverse osmosis (membrane separation) in ultra-pure water system
Reverse osmosis is to let the solvent (usually water) in the solution pass through the reverse osmosis membrane (a semi-permeable membrane) with sufficient pressure, and the direction is opposite to the direction of osmosis. The reverse osmosis method which is greater than osmotic pressure can be used for separation, purification and concentration of solution. The main separation object of reverse osmosis membrane is the ion range in solution.