역삼투 공정 설계 프로그램의 신뢰성 분석

Abstract

Reverse osmosis (RO) is the most commonly used process in the desalination. To design the reverse osmosis process, we must use the RO projection program. The RO projection program is provided by the membrane manufacturers. If we determined the reverse osmosis membrane for design, we have to choose a program developed by the manufacturer. This is because programs manufactured by other manufacturers can not design with the membrane. Therefore, the reliability of the results of the RO projection program is important. To verify the reliability of the results, it is best to experiment with all conditions. However, it is difficult to experiment in all conditions. So, we analyze the trends in projection results in some conditions to see if they show reasonable patterns. We use five RO projection programs to test(eg CSMPRO Ver 5.0, IMS Design, ROSA 9.0, LG Chem Nano H2O and Toray DS2). We use 10 different SWRO membranes (five high flux and five low flux membranes) from the manufacturer with five projection programs. In most cases, feed pressure decrease under high temperature conditions. But in some cases, the feed pressure increase under high temperature conditions. This is the reason the increase in osmotic pressure overcomes the increase in water permeability as temperature increased in these simulation conditions. The various rates of change in feed pressure and salt rejection with temperature does not depend on membrane characteristics. There is only one RO projection program that reflect the effect of feed water pH on salt rejection. Therefore, we need to check when we design RO process in the conditions with variable temperature and pH.