The objectives of this research are to investigate the proper coagulation conditions which are a type and doses of coagulants, mixing conditions (velocity gradients and mixing times), pH and so on through Jar-test, to evaluate the flux variations, permeate, backwashing according to characteristics of pretreatment of the wastewater by means of MF membranes for river maintenance water reuse. The effluent water from B-city K-sewage treatment plant are used for this research. Turbidity and suspended solids(SS) are 14.2 NTU and 10.4 mg/L respectively. This condition causes fouling for membrane process. The flux decline could be reduced when coagulation pretreatment was carried out. Optimal coagulations PAC which are commonly used in the sewage treatment plant was observed in this research. The results indicate that an optimal coagulation dose and pH are 80 ppm and pH of 7 respectively, but coagulation efficiency was lower at strong acid or strong base. Results showed that continuous and steady operations in membrane separation process by means of the effective removal of organic matter and turbidity with coagulation pretreatment of sewage secondary effluent were achieved.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 실험재료
  2.2. 실험장치 및 방법
 3. 결과 및 고찰
  3.1. 최적 응집조건 결정
  3.2. 막여과 투과성능 평가
  3.3. 응집제 주입에 따른 여과막 투과성능 평가
 4. 결 론
 참 고 문 헌

• 정진희(동아대학교 환경공학과) | Jung-Jin hee (Department of Environmental Engineering, Dong-A University)
• 최영익(동아대학교 환경공학과) | Young-Ik Choi (Department of Environmental Engineering, Dong-A University) Corresponding Author
• 장성호(부산대학교 지역환경시스템공학전공) | Sung-Ho Jang (Department of Environment System Engineering, Busan University)