| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for sterilizing a demineralizer capable of preventing deposition of a scale on the surface of a reverse osmosis membrane even if sterilization using hot water is repeated and simply sterilizing the demineralizer, and to provide the demineralizer. <P>SOLUTION: Raw water in a raw water tank 2 storing water to be treated used in the demineralizer 1 is heated by a first heat exchanger 3 as hot water supply means. Hydrochloric acid is loaded into the heated hot water from a hydrochloric acid supply device 9 as acid loading means and acid hot water the pH of which is adjusted at not more than the saturated solubility of calcium carbonate is supplied to the reverse osmosis membrane 5. Sterilization by the acid hot water continues for 10 to 60 minutes, the temperature of the reverse osmosis membrane 5 is gradually increased and the sterilization is completed. After the sterilization is completed, the demineralizer 1 is wholly rinsed by pure water or the like when required, thereafter the raw water is removed from the raw water tank 2, the raw water is treated by the reverse osmosis membrane 5, and then the pure water is produced. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
