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Abstract: In seawater reverse osmosis (SWRO) process, free chlorine is used in a pretreatment process to inhibit biofouling on reverse osmosis (RO) membrane. The residual chlorine in feed water should be eliminated by using sodium bisulfite (SBS) before flowing into RO membrane because polyamide RO membrane is damaged by free chlorine contact. In a field application, there always exists a risk that SBS injection pump is out of order so that polyamide RO membrane may be damaged by the residual chlorine. Chlorine disinfection can be replaced by ultraviolet (UV) disinfection.
The objective of this work is to quantitatively investigate the effect of residual chlorine attack on polyamide RO membrane and assessment of UV disinfection as an alternative of chlorine disinfection.
Lab-scale RO tests were performed to see changes in permeate flux and salt rejection by adding sodium hypochlorite and SBS. In addition the effect of UV disinfection on bio-fouling was investigated.
As a result, the permeability of RO membrane decreased after residual chlorine contact, which does not mean damage of membrane, but means the change in the membrane characteristics. And UV disinfection was found to be used for the bio-fouling control.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/1572
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001966981

Table Of Contents: 1. 서론 1
1.1 연구 배경 1
1.2 연구 가설 2
1.2.1 역삼투막의 염소접촉으로 인한 성능 변화 분석 2
1.2.2 염소소독공정의 대체 공정의 성능 확인 3
1.3 연구 내용 4
2. 문헌연구 6
2.1 해수담수화 6
2.1.1 해수의 성분 7
2.1.2 증발법 8
2.1.3 역삼투법 12
2.2 Polyamide (PA) 재질의 역삼투막 13
2.2.1 Polyamide (PA) 막 구조 및 특성 14
2.2.2 Polyamide (PA) 막의 내염소성 및 손상 14
2.3 유·무기 막오염 16
2.3.1 유기 막오염(organic fouling) 17
2.3.2 무기 막오염(inorganic fouling, Scaling) 18
2.3.3 막오염 영향 요소 20
2.3.4 막오염 제어 방안 24
2.4 미생물 막오염(bio fouling) 26
2.4.1 미생물 막오염 발생 27
2.4.2 미생물 막오염 문제점 27
2.4.3 미생물 막오염 제거 28
3. 재료 및 방법 33
3.1 실험 재료 및 장치 33
3.2 실험 분석 방법 35
3.3 실험 방법 37
3.3.1 역삼투막의 염소접촉 실험 37
3.3.2 미생물 막오염 억제 실험(염소소독, UV 소독) 38
4. 연구 결과 39
4.1 염소접촉에 따른 역삼투막 성능 변화 39
4.1.1 염소접촉(1회) 39
4.1.2 염소접촉(3회) 44
4.1.3 염소접촉(고농도) 48
4.2 염소, UV 소독에 따른 미생물 막오염 억제 효과 54
4.2.1 염소소독 54
4.2.2 UV 소독 59
5. 결론 및 향후연구 62
5.1 결론 62
5.2 향후연구 63
참고문헌 65

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