This study was aimed to examine inorganic fouling and fouling reduction method in direct contact membrane distillation(DCMD) process. Synthetic seawater of NaCl solution with CaCO3 and CaSO4 was used for this purpose. It was found in this study that both CaCO3 and CaSO4 precipitates formed at the membrane surface. More fouling was observed with CaSO4(anhydrite) and CaSO4･0.5H2O(bassanite) than CaSO4･2H2O(gypsum). CaCO3 and gypsum were detected at the membrane surface when concentrates of SWRO(seawater reverse osmosis) were treated by the DCMD process, while gypsum was found with MED(multi effect distillation) concentrates. Air backwash(inside to out) was found more effective in fouling reduction than air scouring.

ABSTRACT
1. 서 론
2. 재료 및 실험방법
    2.1 막 증발 장치의 구성
    2.2 실험방법
3. 결 과
    3.1 해수 및 농축수 수질특성
    3.2 DCMD 막 오염 실험
    3.3 공기세정을 이용한 막오염 저감
4. 결 론
References

• 이태민(경남대학교 토목공학과) | Tae-Min Lee (Department of Civil Engineering, Kyungnam University)
• 김승현(경남대학교 토목공학과) | Seung-Hyun Kim (Department of Civil Engineering, Kyungnam University) Corresponding author