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pp.111-119
Electro-coagulation process has been gained an attention recently because it could overcome the membrane fouling problems in MBR(Membrane bio-reactor). Effect of the key operational parameters in electro-coagulation, current density(ρ i) and contact time(t) on membrane fouling reduction was investigated in this study. A kinetic model for ρi and t required to reduce the membrane fouling was suggested under different MLSS(mixed liquor suspended solids) concentration. Total 48 batch type experiments of electro-coagulations under different sets of current densities(2.5, 6, 12 and 24 A/m2), contact times(0, 2, 6 and 12 hr) and MLSS concentration(4500, 6500 and 8500mg/L) were carried out. After each electro-coagulation under different conditions, a series of membrane filtration was performed to get information on how much of membrane fouling was reduced. The membrane fouling decreased as the ρi and t increased but as MLSS decreased. Total fouling resistances, Rt (=Rc+Rf) were calculated and compared to those of the controls (Ro), which were obtained from the experiments without electro-coagulation. A kinetic approach for the fouling reduction rate (Rt/Ro) was carried out and three equations under different MLSS concentration were suggested: i) pi0.39t = 3.5 (MLSS=4500 mg/L), ii) pi0.46t = 7.0 (MLSS=6500 mg/L), iii) pi0.74t = 10.5 (MLSS=8500 mg/L). These equations state that the product of ρi and t needed to reduce the fouling in certain amounts (in this study, 10% of fouling reduction) is always constant.
1. 서 론
2. 재료 및 연구방법
2.1 활성슬러지 배양
2.2. 전기응집(Electro-coagulation)
2.3 막 오염 정량화
3. 결과 및 고찰
3.1 전기응집 조건에 따른 여과 성능 비교
3.2 활성슬러지 MLSS 농도에 따른 총오염저항 (Rt)의변화
3.3 접촉시간 및 전류밀도에 따른 막 오염 저감 속도모델링
4. 결 론
References
