Apparatus and Method for Multistage Reverse Osmosis Separation

摘要

This invention relates to an apparatus and method for a multistage reverse osmosis separation which comprises reverse osmosis membrane module units arranged at multistage with a booster pump provided in the concentrate flow channel between reverse osmosis membrane module unit, wherein the total effective reverse osmosis membrane area of a module unit is in the range of 20-80% of that of the preceding module unit. The object of this invention is to provide apparatus and separation method that produce low-concentration solution from high-concentration solution with a high recovery ratio, small energy requirements, and high stability.