| 摘要 |
PROBLEM TO BE SOLVED: To provide a fresh water generating method using reverse osmotic separation which enables reduction in water generating cost. SOLUTION: Sea water is fed to a reverse osmosis membrane unit containing reverse osmosis membrane elements to separate concentrated sea water and obtain permeated water. In this case, a portion of the concentrated sea water is added to the feeding sea water of the reverse osmosis membrane module unit and also, while the pressure higher by 0.5-5 MPa than osmotic pressure of the feeding sea water is always applied to the reverse osmosis membrane, sea water is treated to generate fresh water.
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