| 摘要 |
PROBLEM TO BE SOLVED: To provide a method efficiently producing high purity of pure water with a stable operation for a long period by suppressing generations of slime and scale in an electric regeneration type deionizing device, and also suppressing a generation of the slime in the system, in a pure water production process built in the electric regeneration type deionizing device. SOLUTION: In a method for producing pure water by successively making raw water pass through an activated carbon tower 1, a deaeration device 2, a RO membrane separation device 3 and the electric regeneration type deionizimg device 4, acid is added to the feed water introduced into the activated carbon tower 1 such that pH of the feed water introduced into the electric regeneration type deionizing device 4 becomes 4.0-5.5, and the pH is adjusted. |
