Development of Ultra Low Pressure Type RO Membrane with High Boron Rejection（ES20B）

Abstract

In the field of seawater desalination, the reverse osmosis (RO) method consumes less energy and has more com-pact facilities than the conventional evaporation method. Today, apart from applications relating to industry anddrinking water, it is also used for irrigation water and other agricultural uses, contributing thus to resolving watershortages. The proportion treated by the RO membrane method is also growing year by year. And the number ofseawater desalination plants equipped with boron-removal facilities is growing at a rate of over 50% a year and nowaccounts for 70% of all plants. We developed ES20B RO element that has the high boron rejection and alkali tolerance. This newly developed ele-ment can reduce the operation cost and the scale risk. In addition, the extension of the operation life can be expect-ed.