More particularly, the present invention relates to a process for separating and concentrating IPA from wastewater containing IPA by combining a pervaporation membrane separation process and a reverse osmosis membrane separation process, and more particularly, to a process for separating and concentrating IPA from wastewater containing IPA, And at the same time to a combined membrane separation process capable of treating wastewater. According to the combined membrane separation process of the present invention, IPA can be selectively separated from the IPA washing wastewater, and can be recycled by concentration of 30 wt% or more. At the same time, IPA washing wastewater having a concentration of 0.5 wt% It can be processed as it is at the wastewater treatment plant.
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