| Title |
Microfiltratiag Application of Polluted Surface Water to Drinking Water Treatment |
| Authors |
정팔진(Paul Gene Chung), 이성우(Sung Woo Lee), 김충환(Chung Hwan Kim), 채선하(Seon Ha Chae) |
| Abstract |
Membrane processes including microfiltration(MF), ultrafiltration(UF) and nanofiltration(NF) membrane have been recently applied to produce drinking water from river, lake and canal sources. In this study, dead-end MF membrane system was operated to treat polluted water from the downstream of Kum river. Permeate flux, removal of Fe, Mn, KMnO₄ consumed, THMFP were evaluated and compared with the effluent quality of conventional water treatment.- coagulation, sedimentation and sand filtration. Permeate flux and flux recovery after backwashing were monitored continuously. Initially permeate flux was 120ℓ/㎡/hr and then decreased to 70ℓ/㎡/hr which was stabilized after 60 days of operation. Turbidity of raw water was in the range of 2.8∼25.7NTU but the MF system gave the removal efficiency of over 99%, maintaining stable and good water quality which compared to the conventional process. Removal of KMnO₄ consumed and THMFP by MF process were 50% and 57.7% respectively. Fe was reduced to 96% and Mn was 30.5% since dissolved Mn in water is hard to be converted to colloidal Mn which can not pass through the membrane. The particle size distributions for raw water, sandfiltration and MF filtered water were obtained by counting particles in 2.0∼10.0㎛ range. The MF rejection for total particle number and particle number of 2.0∼4.0㎛ range was better than the conventional water treatment. Because of increasingly stringent regulations in the future, this technology has the potentiality of MF application to water treatment processes. |