| 摘要 |
PURPOSE:To continuously and efficiently produce water of high purity over a long period of time, in an apparatus for producing pure water by treating raw water using an RO(reverse osmosis) membrane device and an CDI (electrodialyser), by preventing the deterioration of an RO membrane or the ion exchange resin of the CDI due to dissolved oxygen in raw water, the lowering in the quality of treated water due to the propagation of bacteria, the lowering of the amount of treated water and the clogging of the RO membrane. CONSTITUTION:A raw water deoxidizing means is provided and raw water is successively treated in the order of deoxidizing device (vacuum degassing tower 2) RO membrane device 3 CDI 5. Since the raw water subjected to deoxidizing treatment in the vacuum degassing tower 2 is introduced into the RO membrane device 3, the deterioration of the RO membrane or the iron exchange resin of the CDI 5 due to dissolved oxygen in raw water is prevented. The propagation of bacteria is also suppressed and bacteria trouble such as fouling or the clogging of the RO membrane is also prevented and water of high purity can be efficiently produced. |
