| Title |
Pilot-Scale Simulation of Desalination Process Using Water Integrated Forward Osmosis System |
| Authors |
김봉철 ( Bongchul Kim ) ; 홍승관 ( Seungkwan Hong ) ; 최준석 ( Juneseok Choi ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.33.4.403 |
| Keywords |
Energy consumption; Forward osmosis; Fouling; Osmotic dilution; Reverse osmosis |
| Abstract |
Currently, wastewater reclamation and seawater desalination play essential role in addressing the challenge of worldwide water scarcity. Particularly, reverse osmosis (RO) for seawater desalination process is commonly used due to less energy consumption than conventional thermodynamic systems. However, membrane fouling and electrical energy consumption during operation of RO system for seawater desalination haver continued to be a obstruction to its application. In this study, therefore, wastewater secondary effluent is used for osmotic dilution of seawater. Firstly, fouling behaviour of RO by simulating wastewater effluent in osmotic dilution process was measured and we calculated energy consumption of overall desalination process by theoretical equations and commercial program. Our results reveal that RO membrane fouling can be efficiently controlled by pre-treatment systems such as nano filtration (NF) or forward osmosis (FO) process. Especially FO system for osmotic dilution process is a non-pressurized membrane system and, therefore, the operating energy consumption of overall desalination system was the lowest. Moreover, fouling layer on FO membrane is comparatively weak and reversible enough to be disrupted by physical cleaning. Thus, RO system with low salinity feed water through FO process is possible as a less energy consuming desalination system with efficient membrane fouling control. |