Abstract
Improved thin-fim composite low pressure type reverse osmosis (RO) menbranes has been developed. The menbranes exhibits high salt and Organic materials rejection and high flux at low operating pressures. Low pressure type menbranes are classified into (1) high rejetion type RO menbranes and (2) loose RO (Nanofiltration) menbranes.
We will review the performance and aplications of resent low pressure type RO menbranes. The ultra-low pressure type RO membrane “ES10”, recently developed, exhibits up to 99.5% NaCl rejection, 95% isopropanol rejection and 30 m3/d (8-inch element) when tested at 0.75Mpa (107psi) and 25°C on 500 ppm solution.
