Pretreatment system of desalination process using seawater reverse osmosis(SWRO) membrane is the most critical step in order to prevent membrane fouling. One of the methods is coagulation-UF membrane process. Coagulation-UF membrane systems have been shown to be very efficient in removing turbidity and non-soluble and colloidal organics contained in the source water for SWRO pretreatment. Ferric salt coagulants are commonly applied in coagulation-UF process for pretreatment of SWRO process. But aluminum salts have not been applied in coagulation-UF pretreatment of SWRO process due to the SWRO membrane fouling by residual aluminum. This study was carried out to see the effect of residual matal salt on SWRO membrane followed by coagulation-UF pretreatment process. Experimental results showed that increased residual aluminum salts by coagulation-UF pretreatment process by using alum lead to the decreased SWRO membrane salt rejection and flux. As the salt rejection and flux of SWRO membrane decreased, the concentration of silica and residual aluminum decreased. However, when adjusting coagulation pH for coagulation-UF pretreatment process, the residual aluminum salt concentration was decreased and SWRO membrane flux was increased.

ABSTRACT
1. 서 론
2. 재료 및 실험방법
    2.1 원수의 수질특성
    2.2 응집 및 UF 여과
    2.3 역삼투막 실험 장치
3. 결과 및 고찰
    3.1 응집제 주입농도에 따른 탁도 제거효율 및 잔류금속염의 농도 변화
    3.2 잔류 알루미늄에 의한 탁도 변화
    3.3 잔류 금속염에 의한 역삼투막의 성능 변화
    3.4 응집 pH 조절을 통한 잔류 알루미늄의 제거 및역삼투막의 성능 변화
4. 결 론
References

• 고길현(부경대학교 환경공학과) | Gilhyun Go (Department of Environmental Engineering, Pukyong National University)
• 김수현(부경대학교 환경공학과) | Suhyun Kim (Department of Environmental Engineering, Pukyong National University)
• 강임석(부경대학교 환경공학과) | Limseok Kang (Department of Environmental Engineering, Pukyong National University) Corresponding author