| 摘要 |
PROBLEM TO BE SOLVED: To provide a purified water recovering apparatus which can relatively stably obtain purified water with high purity even in waste water such as domestic waste water and industrial waste water. SOLUTION: The purified water recovering apparatus includes a reverse osmosis membrane unit 1 separating feed water into purified water as permeate water and concentrated water as non-permeate water by reverse osmosis membrane filtration, wherein waste water is fed as the feed water, and the purified water discharged from the reverse osmosis membrane unit is recovered. The apparatus includes: at least one impurity measurement device measuring the impurity degree of at least one of the feed water, concentrated water and purified water; and at least one of paths selected from a dilution path 8 transferring the purified water and diluting the feed water and a detour path 9 detouring the reverse osmosis membrane unit and transferring the feed water to the downstream side as concentrated water without filtering the feed water, and, in the case a measured value measured by the impurity measurement device lies in a standard value or above, at least either the dilution by the dilution path or the detour by the detour path is performed. COPYRIGHT: (C)2009,JPO&INPIT
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