en
Core Purification Process (Typical Process)
The preparation of 18 megaohm ultrapure water is a "step-by-step purification" process that requires a combination of multiple separation technologies, and the typical process is as follows:
Pretreatment stage: remove large particles of impurities, colloids, residual chlorine, etc. in the raw water to protect the subsequent core equipment (such as reverse osmosis membrane).
Steps: Quartz sand filtration (removal →of sediment and suspended solids) → activated carbon filtration (removal of residual chlorine and organic matter) → security filtration (precision filtration, interception of ≥ 5μm particles) of the original water tank.
Primary desalination stage: removing more than 90% of ions and organic matter is the key to "reducing costs and increasing efficiency".
Core technology: Reverse osmosis (RO) - Uses the pressure difference between the semi-permeable membrane to trap salt ions and macromolecular organic matter in the water to produce "reverse osmosis water" (resistivity of about 1-10 megaohms).
Deep Desalination Stage: Further removal of residual ions to achieve 18 megaohm purity.
Core technologies: ion exchange resins or continuous electrodeionization (EDI):
Ion exchange resin: adsorb residual ions through cational and anion exchange resins, which need to be regenerated regularly (less environmentally friendly);
EDI: Combining ion exchange and electrolysis technology, no chemical regeneration, more environmentally friendly, high degree of automation, is the current mainstream.
Terminal purification stage: remove trace organic matter and microorganisms to ensure stable water quality.
Steps: UV sterilization (microbial removal) → terminal ultrafiltration / microfiltration (interception of tiny particles) → storage in ultrapure water tank
