| 摘要 |
PURPOSE:To remove bacteria adherent onto the inner wall of piping for inhibiting the propagation of bacteria in highly demineralized water, in the transportation of highly demineralized water containing the very small amount of fine particles, by abruptly raising the flow speed of said highly demineralized water flowing through the piping at least one time a day. CONSTITUTION:In manufacturing highly demineralized water, raw water is sent to a primary demineralizing system A at first and then sequentially subjected to coagulation 1, treatment 2 with a reverse osmosis membrane and ion-exchanging treatment 4. Then, the water is supplied to a sub-system B, subjected to ultraviolet irradiation 5 and polishing treatment 6 to annihilate microbes existent in the water, and then converted into highly demineralized water by a reverse osmosis or ultrafiltration method 7 to remove organic substance and fine particles from the water. The demineralized water is sent to a using site 8 through piping made of fluororesin, e.g. trifluoroethylene, or high-density polyethylene. Hereon, bacteria adherent onto the inner wall of the piping are removed by raising the speed of transportation of the highly demineralized water twice or more about one time a day, to inhibit the propagation of bacteria in the highly demineralized water.
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