정삼투-역삼투 융합 공정의 효율적 에너지 저감 방안 및 보론 제거율 향상에 관한 연구

Abstract

Energy reduction and environmental problems caused by concentrated effluent water are very important issue in desalination using seawater reverse osmosis (SWRO). Because SWRO process needs high energy consumption and has l0w boron removal even though SWRO shows high rejection rate (more than 99 %). As a result of effort to decrease energy consumption in SWRO, energy consumption is reached to the thermodynamical minimum value. Current state-of-the-art SWRO plants consume between 3 and 4 kWh/m3. To reduce environmental problems and energy consumption, scientific research about hybrid process of forward osmosis (FO)-reverse osmosis (RO) is being carried out. The main problem in FO process is dissociation of draw solution. Hybrid process of FO-RO is expected to solve this problem and has some advantages for energy consumption and environmental problems by diluting concentration of seawater intake to RO process using reusable water. In this research, efficient energy reduction considering concentrated water from FO and RO and enhanced boron removal in FO-RO hybrid process are discussed. The results of this study demonstrated that using polyol in lab-scale RO system can improve boron removal and showed when forward osmosis permeate flow increases RO energy consumption can be decreased. For more precise determination for limit of energy reduction, economic evaluation and location of RO-plant should be considered.