Osmotic power is to produce electric power by using the chemical potential of two flows with the difference of salinity. Water permeates through a semipermeable membrane from a low concentration feed solution to a high concentration draw solution due to osmotic pressure. In a pressure retarded osmosis (PRO) process, river water and wastewater are commonly used as low salinity feed solution, whereas seawater and brine from the SWRO plant are employed as draw solution. During the PRO process using wastewater effluent as feed solution, PRO membrane fouling is usually caused by the convective or diffusive transport of PRO which is the most critical step of PRO membrane in order to prevent membrane fouling. The main objective of this study is to assess the PRO membrane fouling reduction by pretreatment to remove organic matter using coagulation-UF membrane process. The experimental results obtained from the pretreatment test showed that the optimum ferric chloride and PAC dosage for removal of organic matter applied for the coagulation and adsorption process was 50 mg/L as FeCl3 (optimum pH 5.5). Coagulation-UF pretreatment process was higher removal efficiency of organic matter, as also resulting in the substantial improvement of water flux of PRO membrane.

ABSTRACT
1. 서 론
2. 재료 및 실험방법
    2.1 응집 및 UF 여과
    2.2 PRO 장치
    2.3 수질 분석 방법
3. 결과 및 고찰
    3.1 원수의 수질특성
    3.2 응집제 주입량에 따른 유기물 농도 변화
    3.3 응집-UF 막 전처리 공정의 적용
    3.4 전처리 공정에 따른 PRO 막의 성능 변화
4. 결 론
References

• 고길현((주)한국멤코 연구전담부서) | Gilhyun Goh (Department of R&D, MEMCOREA Co.,Ltd.)
• 김수현((주)한국멤코 연구전담부서) | Suhyun Kim (Department of R&D, MEMCOREA Co.,Ltd.)
• 김정선(국제환경정책연구원 연구개발실) | Jungsun Kim (Universal Environment Policy Institute)
• 강임석(부경대학교 환경공학과) | Limseok Kang (Department of Environmental Engineering, Pukyong national University) Corresponding author