| 摘要 |
PROBLEM TO BE SOLVED: To control the amperage of a continuous electric generation type pure water apparatus and to obtain high quality without scale hindrance by a method in which the pH of raw water is adjusted at a specified value, the raw water, after being deaerated, is subjected to anion exchange and separated into filtrate and concentrated water by reverse osmosis membrane separation, and the filtrate is converted into pure water by the pure water apparatus. SOLUTION: City water is treated with a clarifying apparatus 1, after its pH being adjusted at 3-5 with HCl, is supplied to a deaerator 2 for deaeration. After the deaerated water being passed through an anion exchange resin column 3, the water, together with the concentrated water of a continuous electric regeneration type pure water apparatus (CEDI) 5 of a post-stage and electrode water, is mixed with HCl, with its pH adjusted at about 6.5-7, and passed through a reverse osmosis membrane separator (RO apparatus) 4 to obtain concentrated water and filtrate. Part of the filtrate is sent to the treated water chamber 5A of the CEDI 5 to be made into pure water. The residual filtrate is sent to a concentrated water chamber 5B to be supplied to an electrode as concentrated water. In this way, high quality treated water is obtained with a reduced power consumption. |
