Process Analysis of Scientific Preparation of Ultrapure Water by Thelab Series Ultrapure Water System

In the ultra-pure water system of Thelab series, in the preparation of ultrapure water, the raw water entering the ion exchange resin is pre-desalted by reverse osmosis, and then the particles and microorganisms in the water are removed by ultrafiltration and microfiltration.

The advantages of using reverse osmosis method to produce ultrapure water in ultrapure water system are: high salt rejection, large water production, low chemical reagent consumption, low labor intensity, stable water quality, long life of ion exchange resin, and extended life of terminal filter; Disadvantages: High-pressure equipment is required, the raw water utilization rate is only 75%-80%, and the membrane should be cleaned regularly.

Ultrapure water system preparation of ultrapure water has the following forms:

1 raw water â†’ pretreatment â†’ ion exchange â†’ UV â†’ ion exchange â†’ MF â†’ water point

2 raw water â†’ pretreatment â†’ ion exchange â†’ RO â†’ UV â†’ ion exchange â†’ MF â†’ water point

3 raw water â†’ pretreatment â†’ RO â†’ ion exchange â†’ UV â†’ ion exchange â†’ UF â†’ water point

4 raw water â†’ pretreatment â†’ ion exchange â†’ UV-RO / UF â†’ ion exchange â†’ MF â†’ water point

5 raw water â†’ pretreatment â†’ RO â†’ degassing â†’ ion exchange â†’ UV â†’ RO / UF â†’ water point

6 raw water â†’ pretreatment â†’ RO â†’ ion exchange â†’ UV â†’ RO / UF â†’ water point

All processes of the ultra-pure water system of Thelab series include pre-treatment, ion exchange, ultraviolet sterilization and membrane separation equipment. Membrane separation devices are installed as terminal equipment before the water point, and a circulation process is provided to stabilize the water quality. To prevent fungal contamination.

The problems that the ultrapure water system pays attention to when preparing pure water are: high water activity, very easy to dissolve gas, and absorption of CO2, so the equipment must be tightly sealed or nitrogen-filled. If it is transported by stainless steel pipe, the inner surface should be pickled, the conveying distance should be shortened as much as possible, and at the same time, it should be sterilized frequently to prevent microbial contamination. Before the operation of the new equipment, the whole system should be sterilized, sterilized with activated carbon and cation exchange resin at a temperature of 105 Â° C for 30-60 min, or converted into a sodium type, and then immersed in a 0.5% NaCIO solution for 1-3 h, or 0.5%-1% formaldehyde is circulated or soaked for 3-8h. Thelab series of ultrapure water systems are typically sterilized once a month and once a week in the pharmaceutical industry.

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