Ultra-pure water equipment is a water treatment facility that uses data preprocessing, reverse osmosis technology, ultra-purification treatment and post-treatment methods to remove almost all conductive media in water, and to remove colloidal chemicals, gases and organic matter that do not dissociate in water to a very low level.
The pure water system equipment mainly adopts reverse osmosis treatment membrane technology. The basic working principle of it is to apply a certain pressure to water, allowing water molecules and ionic minerals to pass through the reverse osmosis membrane. However, the vast majority of elements dissolved in water require inorganic salts (including some heavy metals), organic matter, and other bacteria, viruses, etc. that cannot choose to pass through the reverse osmosis membrane. This strictly separates the permeable pure water from the non-permeable concentrated water. The pore size on reverse osmosis membranes is only 0.0001 micrometers, while the diameter of viruses is generally 0.02-0.4 micrometers and that of common Chinese bacteria is 0.4-1 micrometers.
First, they have different uses
(1) Applications of ultrapure water system equipment:
Production and cleaning of ultra-pure materials and ultra-pure reagents...
(2) Production and cleaning of electronic products.
3. Production of battery products.
4. Production and cleaning of semiconductor products.
5. And the production of clean circuit boards.
6. The production of high-tech precision management products in other countries.
(II) Use of pure water equipment:
Chemical water treatment in power plants
Ultra-pure water for the electronics, semiconductor and precision machinery industries
3 preparations, food, beverages, drinking water
4. Small-scale ion pure water station, providing pure water for group drinking
5. Fine chemicals, fine tip water discipline
6. Preparation of high-purity water required for the development of other related industries
7. Process water for the pharmaceutical industry
Second, the electrical conductivity of water varies
The effluent quality of ultrapure water: resistivity 15m
The water quality standards for ultrapure water are divided into five sections, namely 18MΩ.cm, 15MΩ.cm, 10MΩ.cm, 2MΩ.cm, and 0.5MΩ.cm, to distinguish different water qualities.
2. The pure water system is divided into: industrial pure water and drinking pure water. For industrial pure water: at 25 degrees Celsius, 1. Pure water is commonly used :EC=1-10us/cm; 2 High-purity water :EC=0.1-1.0us/cm; 3 Ultrapure water :EC=0.1-0.055; Drinking pure water :EC=1-10 us/cm (National safety standard).
Thirdly, this process employs various different devices
(1) The process design flow of the ultrapure water system equipment is:
1. Pretreatment system → Reverse osmosis system → Intermediate water tank → Coarse mixed bed, fine mixed bed, pure water tank → Pure water pump, ultraviolet sterilizer → Polishing mixed bed, precision filter → Water (≥18) CM) (traditional process)...
2 Pretreatment → Reverse osmosis → Intermediate Water tank → Water Pump → edi device → Pure Water tank → Pure Water Pump → Ultraviolet Sterilizer → Polishing mixed bed →0.2 or 0.5m precision filter → Target water for use (≥18m cm)(New technology).
3. Reverse osmosis pretreatment →→ Metering machine (PH adjustment) → Intermediate tank → Second-stage reverse osmosis (positively charged reverse osmosis membrane) → Pure water pump and pure water tank →→→EDI device or ultraviolet sterilizer →0.20.5μm precision filter → Water target (≥17 MΩ.cm) (new technology).
4. Pretreatment → Reverse osmosis → an intermediate water tank → water pump →EDI device → Pure water tank → Pure water pump → Ultraviolet sterilizer →0.2 or 0.5μm precision mechanical filter → Water management object (≥15MΩ.cm) (new technology process).
5. Pretreatment system of reverse osmosis system →→→ Pure water pump, intermediate box, coarse and fine mixed bed →→→ Precision filter, UV water disinfection object (≥15MΩ.cm) (conventional treatment) →→ mixed bed.
(2) The process design flow of the pure water system equipment is:
1. Adopt the ion exchange method
→ Water filter → Vacuum filter → anion resin filter bed, anion resin filter bed, anion resin → microporous filter →→→→ Water point
2. Reverse osmosis method
Raw water → raw water booster pump → Multi-media filter, activated carbon filter, softener stage reverse osmosis, PH adjustment for the second stage reverse osmosis →→→ Intermediate tank →→→ Precision filter (RO membrane surface positively charged) → Purified water → Pure water pump →→ Water point micro-pore filter
3. Adopt the EDI method
Raw water → Raw water is pressurized by the pump → multiple media pass through the filter → Activated carbon is used as the filter → water softener → Precision mechanical filter → primary treatment reverse osmosis machine → middle water tank → middle control water pump →EDI system → microporous filter → water usage point
