High efficiency water treatment system using forward osmosis ion barrier membranes

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There has been a growing interest in forward osmosis (FO) systems. In this research, we prepared PVA-based charged FO membranes (FO-IB membranes) and measured membrane potential and ion permeability coefficient in an FO system to investigate the relationship between membrane potential and ionic permeability. The water flux of the FO-IB membranes was 2.6 L/m2h, which is 1.6 times greater than the value for commercially available FO membranes. In the P and N layers of the FO-IB membranes, the permeability coefficient of anions increased, and that of cations decreased, with increasing membrane potential of the layers. In the FO permeation test using an FO test membrane module, and FS containing calcium ions as a model for harmful ions, Calcium ions were not detected on the DS side, and were concentrated by a factor of 3.7 in the FS solution.