Process analysis of scientific preparation of ultrapure water in therab series ultrapure water system

The process of scientific preparation of ultra pure water in therab series ultra pure water system The advantages of using reverse osmosis to manufacture ultra pure water in ultra pure water system are: high desalination rate, large water yield, low consumption of chemical reagent, low labor intensity, stable water quality, long service life of ion exchange resin and long service life of terminal filter; disadvantages: high pressure equipment is required, raw water utilization rate is only 75% - 80%, and membrane needs to be cleaned regularly The process of ultra pure water system is as follows: ① raw water → pretreatment → ion exchange → UV → ion exchange → MF → water point ② raw water → pretreatment → ion exchange → ro → UV → ion exchange → MF → water point ③ raw water → pretreatment → ro → ion exchange → UV → ion exchange → UF → water point ④ raw water → pretreatment → ion exchange → uv-ro / UF → ion exchange → MF → water point ⑤ raw water → pretreatment → ro → degassing → ion exchange → UV → Ro / UF → water point ⑥ raw water → pretreatment → ro → ion exchange → UV → Ro / UF → water point therab series ultra pure water system All processes of ultra pure water preparation include pretreatment, ion exchange, UV sterilization and membrane separation devices Before the water point, membrane separation devices are set as the terminal equipment At the same time, circulation processes are set to stabilize the water quality and prevent bacterial pollution When preparing pure water, the ultra pure water system should pay attention to the following problems: high activity of pure water, easy to dissolve gas and absorb CO2, so the equipment must be strictly sealed or nitrogen filled for protection If stainless steel pipe is used for conveying, the inner surface shall be pickled to shorten the conveying distance as much as possible, and at the same time, sterilization shall be carried out frequently to prevent microbial pollution Before the operation of the new equipment, the whole system should be sterilized by using active carbon and cation exchange resin at 105oC for 30-60min, or by changing the resin into sodium type and then soaking it in 0.5% nacio solution for 1-3H, or by using 0.5% - 1% formaldehyde for 3-8h Therab series ultra pure water system is usually sterilized once a month, once a week for the pharmaceutical industry.