The higher the integration level of integrated circuits in the electronics industry, the higher the requirements for water quality. The Ministry of Electronics Industry now divides electronic-grade water quality technology into five industry standards, which are 18MΩ.cm, 15MΩ.cm, 10MΩ.cm, 2MΩ.cm, and 0.5MΩ.cm, which are used to distinguish different water quality. At present, the ultra pure water equipment technology for preparing ultra pure water for the electronics industry is basically the following three, and most of the other process flows are derived from different combinations based on the following three fundamental process flows.
The first is the traditional water treatment method for preparing ultrapure water by using ion exchange resin. The basic process is: raw water → sand charcoal filter → fine filter → raw water tank → positive bed → overcast bed → mixed bed (double bed) → pure Water tank → pure water pump → rear-mounted fine filter → water point; its strengths are that the initial investment is small and it occupies less land, but it requires frequent ion regeneration, which will consume a lot of acids and alkalis, and it is certain to the environment Damage.
The second method is to use a combination of reverse osmosis water treatment equipment and ion exchange equipment. The basic process is: raw water → sand charcoal filter → fine filter → raw water tank → reverse osmosis equipment → mixed bed (double bed) → pure water Box → pure water pump → rear fine filter → water point; its advantages and disadvantages are basically the same as the traditional water treatment method for preparing ultrapure water with ion exchange resin.
Then, it is the method of using reverse osmosis water treatment equipment and electric deionization (EDI) equipment for deployment. This is a new process for preparing ultrapure water, and it is also an environmentally friendly, economical, and ultra-pure water preparation with great potential for development. Process, its basic process is: raw water → sand charcoal filter → fine filter → raw water tank → reverse osmosis equipment → electric deionization (EDI) → pure water tank → pure water pump → rear fine filter → water point
This is an economical and ultra-pure water production process for the production of ultrapure water. It does not require regeneration with acid and alkali to produce ultrapure water one after the other, and it is not harmful to the environment. But this approach is relatively expensive.
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