| Popis: |
In this study, Fenton reaction was studied for the possibility of applying as advanced treatment and its optimal condition for the removal of refractory organics from the dye wastewater. Fenton reaction was applied to remove refractory organics after the bio-treatment (secondary treatment) inside test laboratory and on-site pilot plant. Wastewater from the secondary treatment was used and its CODMn was measured as 30∼50mg/L. After the Fenton reaction, the optimal condition was found as pH 3∼3.5, reaction time 2∼2.5hr, chemical input ratio of (FeCl2(33%)/H2O2(35%)) was 3 : 1. When chemical input ratio of (FeCl2(33%)/H2O2(35%)) was at its optimal, amount of sludge volume (SV2hr) was 21∼28%. With pilot plant test, removal rate was heavily influenced by the hydraulic retention time(HRT), and optimum value of HRT was 2.0 hr. When pilot plant(2m 3 /d) was placed on-site and operated continuously, it showed steady and fairly good treatment of COD where COD removal rate was 60∼70%, treated water showed below 20mg/L. |
