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Ultrapure water system
Ultrapure water was originally developed by the U.S. technology community for the production of ultra-pure materials—such as semiconductor components and nano-fine ceramic materials—using techniques like distillation, deionization, reverse osmosis, or other suitable supercritical precision technologies. Today, ultrapure water has found widespread application in fields including biology, medicine, and automotive engineering. In addition to water molecules (H2O), this type of water contains virtually no impurities whatsoever, let alone bacteria, viruses, or organic compounds such as chlorinated dioxins. Of course, it also lacks the trace minerals and essential micronutrients that the human body needs. Ultraclean water is completely free of hardness and has a slightly sweet taste; it is often referred to as "soft water." It can be consumed directly or boiled for drinking. Achieving ultrapure water quality is extremely challenging with conventional water treatment processes—for instance, when the water's resistivity exceeds 18 MΩ·cm, and approaches 18.3 MΩ·cm, it is considered ultrapure water.
A ultrapure water system is a complete production system that generates ultrapure water from raw water. Typically, an ultrapure water system produces ultrapure water through a series of processes including multi-stage filtration, ion exchange, degassing, reverse osmosis, ultraviolet irradiation, ultrafiltration, nanofiltration, and ion adsorption filtration.
Process flow
1. Pre-treatment – Reverse Osmosis – Purified Water Tank – Ion Exchanger – UV Lamp – Pure Water Pump – Point of Use
2. Pre-treatment – First-stage reverse osmosis – Second-stage reverse osmosis (positively charged RO membrane) – Purified water tank – Pure water pump – UV lamp – Water outlet
3. Pre-treatment — Reverse Osmosis — Intermediate Water Tank — Intermediate Pump — EDI Unit — Purified Water Tank — Purification Pump — UV Lamp — Point of Use
4. Pre-treatment → UV sterilization unit → First-stage RO unit → Second-stage RO unit → Intermediate water tank → EDI unit → Deoxygenation unit → Nitrogen-sealed pure water tank → TOC removal UV unit → Polishing mixed-bed unit → Ultrafiltration unit → Water usage points
The water quality meets the ASTM standards of the United States, as well as the ultra-pure water quality standards for the electronics industry (four grades: 18 MΩ·cm, 15 MΩ·cm, 2 MΩ·cm, and 0.5 MΩ·cm).
Ultra-pure water manufacturing technology using reverse osmosis (membrane separation) in ultrapure water systems
Reverse osmosis is a process in which sufficient pressure is applied to force the solvent (typically water) from a solution through a reverse-osmosis membrane—a type of semi-permeable membrane—in a direction opposite to that of natural osmosis. By applying a pressure greater than the osmotic pressure, reverse osmosis can be used to separate, purify, and concentrate solutions. The primary target of separation by reverse-osmosis membranes is the range of ions present in the solution.
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No. 28, Dongke Road, Dongcheng Science and Technology Park, Dongcheng District, Dongguan City
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