| Abstract |
| Natural organic matter (NOM) and turbid matters (colloids, microplastics) in river water used for drinking can foul filtration membranes. This study explores the effects of permeate flux in adsorption/coagulation membrane filtration (MF) system characteristics on the treatment of water, specifically synthetic water containing turbid matter (< 70 ntu) and total organic carbon (TOC, < 8 mg/L). The experiments involved adsorption using powdered activated carbon (PAC), coagulation using a jar test with alum (< 5 mg/L) as a coagulant, and MF process using a stirred dead-cell filter. When appling 10-30 L/m2.h in permeate flux, both coagulation and MF significantly reduced turbid matter but not TOC, while PAC adsorption achieved a 70% higher reduction in TOC than coagulation and MF. The normalized permeate flux (J/Jo) of MF was reduced with increasing filtration time. Experiments with PAC adsorption and coagulation achieved a 30-50% higher permeate flux than those without PAC and coagulation. In particular, the permeate flux of MF coupled with PAC adsorption was similar to that of the coagulation/MF system. The results indicate that humic acid, PAC, and alum play a role in aggregating a particle in the water. However, residual PAC and alum after adsorption and coagulation play a role in increasing membrane fouling. Thus, driven pressure should be lower and the stirring strength higher to increase permeate flux with an appropriate PAC and coagulant dosage. |
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| Key Words |
| 분말활성탄, 알럼, 투과잔존비, 카오린, 흡착-응집-분리막시스템, 휴믹산, Adsorption/coagulation-membrane system, Alum, Humic acid, Kaolin, Normalized permeate flux, PAC |
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