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DOI : 10.17640/KSWST.2016.24.6.53 , Vol.24, No.6, 53 ~ 64, 2016
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| Title |
| A Study on Treated Sewage Reuse by Using Electro-Coagulation |
| 이지영 Ji-young Lee , 김수진 Su-jin Kim , 김진수 Jin-su Kim , 강민구 Min-koo Kang , 이상일 Sang-ill Lee |
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| Abstract |
| This study evaluated usefulness of reclaimed water that was treated by using electro-coagulation. Electro-coagulation was more economical than other treatments because it is not almost affected by season, temperature and pH. This research confirmed removal efficiency by various factors of electro-coagulation. In this study, investigated factors were current, electrodes gap, reaction time, electrode area, rapid mixing speed, slow mixing speed and slow mixing time. We identified optimum condition of the factors through jar-test. It was that current is 2A, electrodes gap is 0.3cm, reaction time(HRT) is 5min, electrode area is 55.76㎠, rapid mixing speed is 100rpm, slow mixing speed is 5rpm and slow mixing time is 20min. When the electro-coagulation by the optimum conditions, the turbidity removal efficiency was 44.03%, T-P removal efficiency was 98.5%, PO4-P removal efficiency was 100% and CODcr removal efficiency was 44.79%. After electro-coagulation, treated water was filtered to remove precipitate. In case of flow rate, 3.4mL/s was appropriate because the speed was too fast to rise turbidity. After filtration, turbidity removal efficiency was 89.7%, T-P and PO4-P removal efficiency were 100% and CODcr removal efficiency was 62.6%. Therefore, the turbidity of the final treated water was 0.42NTU, the concentration of T-P and PO4-P was 0mg/L, CODcr 19.82mg/L, pH 7.76 and possibly can be reused. |
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| Key Words |
| Electro-coagulation, Reclaimed water, Optimum conditions, T-P removal |
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