Method and apparatus having reverse osmosis membrane for concentrating solution.

摘要

A method and an apparatus for treating salt water by a multiplicity of reverse osmosis membrane modules (10, 12) or a structure constituted by combining a multiplicity of reverse osmosis membrane modules (10, 12) and an evaporating device (15) and thereby capable of efficiently treating it while preventing excessively large energy consumption. Salt water is passed through a plurality of reverse osmosis membrane modules (10, 12) so as to be separated into desalted water of a potable water level and high density concentrated water the salinity level of which is 80,000 to 120,000 ppm. <IMAGE>