Operation method of reverse osmosis membrane unit and reverse osmosis membrane system

Abstract

A method of operating a reverse osmosis membrane device involves replacing the high-removal-rate reverse osmosis membrane of the reverse osmosis membrane device with a high-permeability reverse osmosis membrane, namely, a high-permeability reverse osmosis membrane with a permeation flux greater than or equal to 2.0 m3 / (m2·day) at an effective membrane pressure of 1 MPa (water temperature 25°C, pure water (RO permeate)) and a NaCl removal rate greater than or equal to 95% at an effective membrane pressure of 1 MPa, a water temperature of 25°C, and a pH of 7.0. The method of operating the reverse osmosis membrane device includes alternating periods of operation of a water supply pump that supplies water to the reverse osmosis membrane device and periods of shutdown.

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