| 摘要 |
PROBLEM TO BE SOLVED: To efficiently produce a high purity of pure water by preventing a permeable water quantity from being reduced due to slime contamination in an RO membrone speration device and also enhancing efficiency of TOC removal in a deaeration device, in a pure water production device provided with the RO membrane separation device and the deaeration device. SOLUTION: Raw water at 40-45 deg.C is fed to an RO membrane separation device 2. Since the 40-45 deg.C water does not have a direct sterilizing action but has an effect of restraining depositing of slime, it can prevent the slime contamination on the RO membrane separation device. Since a permeable water quantity is enhanced by heating, operational pressure of the RO membrane separation device can be lowered, therefore depositing of the slime is prevented. By heating the water to 40-45 deg.C, volatile oragnic matters hard to be removed with the RO membrane separation device and an ion exchange device of the poststage can be removed and as the result, TOC of the treated water is reduced. |
