| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain stable water quality regardless of the influence of a change in water quality of raw water and aged deterioration of a membrane of a reverse osmosis membrane module. Ž<P>SOLUTION: A reverse osmosis membrane device comprises: a reverse osmosis membrane module 11 which is supplied with raw water through a raw water line and which discharges it as permeate clear of impurities in the raw water and as concentrate with the impurities concentrated; a permeate return line 6 which returns the permeate to the raw water line 12 from a permeate line 14 into which the permeate of the reverse osmosis membrane module 11 is discharged; a flow regulating valve 8 installed in the permeate return line 6; a raw water quality detector 2 installed in the raw water line 12 to detect the water quality of the raw water; and a valve control means 9 which controls the flow regulating valve 8 based on detection signals of the raw water quality detector 2. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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