| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress deterioration of an RO membrane and degradation of water treatment efficiency as much as possible by reducing a washing frequency of the RO membrane with a chemical solution. <P>SOLUTION: During filtering operation by an RO membrane device, a part of concentrated water in the RO membrane device is guided to a circulation pathway. In the circulation pathway, the concentrated water is pressurized by a second pump, air is mixed, and water to be treated and air are stirred using a static mixer to generate fine air bubbles in the water to be treated. Then, the concentrated water containing the fine air bubbles is supplied to a water feed pathway which pressurizes the water to be treated by a first pump and feeds the water to be treated to the RO membrane device. <P>COPYRIGHT: (C)2013,JPO&INPIT |
