Introduction to the Application of Pretreatment Systems in the Production of Ultra-pure Water for Semiconductors

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　　Ultra-pure water equipment is primarily used in high-tech industrial production processes, especially in cutting-edge industries such as semiconductors, where extremely strict requirements are placed on water quality. In water used for semiconductors, the concentrations of metal ions such as K+, Na+, Cu2+, Zn2+, Fe2+, Cr6+, and Mn2+ must be below the ppb level. The total silicon content should be less than 3 ppb, the TOC should be less than 50 ppb, and the resistivity should be above 18 MΩ·cm. Even trace amounts of impurity atoms in the water can have a significant impact on the quality of the products. 　　Pre-treatment system for the production of ultra-pure water in semiconductors. Ordinary water sources generally do not meet the requirements for ultra-pure water, and pre-treatment is essential in the process of producing ultra-pure water. Flocculation sedimentation, oxidation, and adsorption are common pre-treatment processes. Adding flocculants to the raw water or using electrolytic flocculation can remove suspended solids, colloids, and a small amount of organic matter. Oxidation is primarily used to remove biodegradable organic matter and ammonia nitrogen. Adsorption also removes suspended solids and colloids from water.