| 摘要 |
PROBLEM TO BE SOLVED: To provide a pure water producing system which prevents variation in water quality of obtained pure water without using a heat exchanger. SOLUTION: Raw water is filtered by an activated carbon filtration device 1, passed through a feed water pump 2 for a reverse osmosis membrane device, and sent to a reverse osmosis membrane device 3 to be desalinated. The desalinated water in the reverse osmosis membrane device 3 is brought into contact with a water quality sensor 4 equipped with a water temperature sensor 4a, thereafter sent to an electric deionization device 5 to be electrically deionized. The electrically deionized water is brought into contact with a water quality sensor 6 equipped with a water temperature sensor 6a to be extracted as a treated water, i.e. pure water. A sensing signal from the water temperature sensor 6a is input to a current control circuit 8 of the electric deionization device, and controls applied voltage and/or energizing current to the electric deionization device 5 so that electric conductivity or specific resistance of the treated water from the electric deionization device 5 becomes constant. COPYRIGHT: (C)2006,JPO&NCIPI
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