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DOI : , Vol.20, No.5, 81 ~ 90, 2012
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| Title |
| Optimization of Coagulation Conditions for the Drinking Water Treatment Using a Response Surface Method (RSM) |
| 이영주 Young Joo Lee , 임재림 Jae Lim Lim , 이경혁 Kyoung Hyuk Lee , 허태영 Tae Young Heo |
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| Abstract |
| Recently, various types of aluminum coagulants have been developed and applied for the drinking water treatment, However, it is complicated to determine optimal coagulation conditions especially for high basicity coagulants, In order to optimize coagulation conditions (coagulant dosage and pH), conventional multifactor experiment has been applied using trial and error approach, However, there are technical limitation to optimize coagulation condition considering all factors such as coagulant dosage, p1-i, velocity gradient (0) and detention time (t). As an alternative to substitute conventional methods, the experimental design and response surface method (RSN4) in jar tests was investigated in this study. Based on the analysis of experimental results, the optimum condition considering coagulant dose, pH, velocity gradient (G) and detention time (t) was suggested for the highest removal efficiency of turbidity and UV254. The maximum removal efficiency of turbidity and UV254 resulted in pH 7 and pH 6 regardless of basicity of coagulants. The optimal velocity gradient (G) of rapid mixing for the maximum turbidity removal efficiency was 118-196 sec` and low basicity coagulants require high velocity gradient. The optimal detention time (t) of rapid mixing for the maximum turbidity removal efficiency was 67-94 sec and high basicity coagulants require short detention time. The optimal velocity gradient (G) of rapid mixing for the maximum UV254 removal efficiency of was 242-419 sec` and low basiciiy coagulants require high velocity gradient. The optimal detention time (t) of rapid mixing for the maximum UV254 removal efficiency was similar to all types of coagulants. |
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| Key Words |
| Coagulation condition, High basicity coagulant, Experimental design, Response surface method |
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