| 摘要 |
PROBLEM TO BE SOLVED: To provide a pure water production method and apparatus which, even in the case of detergent drain with a high neutral salt concentration, can efficiently decompose and remove neutral salts by using a small amount of a strongly acidic cation exchange resin and a strongly basic anion exchange resin to produce a large amount of pure water, and carry out the treatment by using a conventional apparatus as it is. SOLUTION: High-purity detergent drain of a wet process is supplied, and pretreated with activated carbon AC in an activated carbon tower 1. The treated detergent drain is brought into contact with a weakly basic anion exchange resin WA in a weak anion exchange tower 2 to remove anions, and then brought into contact with a strongly basic anion exchange resin SA in a strong anion exchange tower 3 to decompose the neutral salts. Anions generated by the decomposition is exchanged and adsorbed to be removed. Subsequently, the detergent drain is brought into contact with a strongly acidic cation exchange resin SC in a strong cation exchange tower 4 to remove cations, producing pure water. COPYRIGHT: (C)2008,JPO&INPIT
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