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KMID : 0382420000260040049
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Korean Journal of Environmental Health Society
2000 Volume.26 No. 4 p.49 ~ p.57
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Study on the Removal of Refractory Organic Matter in Leachate sampled at Kimpo Landfill by means of Fenton Oxidation Process
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Chung Dong-Hwan
Jeong Mun-Ho
Cho Il-Hyoung
Kim Ik-Soo
Han In-Kyu
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Abstract
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This study was carried out to find the optimal condition to treat refractory organic matter which can´t treat clearly with biological treatment and to find the optimal division dosage and division dose timing in the modification of Fenton oxidation which is used to resolve the problem that hydrogen peroxide is too expensive. The results are following; 1. The highest TOC removal efficiency was 41% and color removal efficiency was 64% when the dilution magnitude of leachate is 2 fold. This suggests that dilution is efficient when high concentration of leachate is treated. 2. The removal efficiency of TOC and color increased up to the molar ratio between ferrate and hydrogen peroxide was 1:1. However above that ratio, removal efficiency hardly increased. The highest removal efficiency of TOC and color were 48% and 71% when the mole ratio of ferrate to hydrogen peroxide was 1.5:1. 3. When the mole ratio between ferrate and hydrogen peroxide was fixed, the removal efficiency of TOC and color increased as the dosage of hydrogen peroxide increased. 4. pH of samples were adjusted at pH 3, 5, 7, 9, 11. After oxidation reaction, pH of samples were dropped to 2.59, 2.54, 5.34, 6.36 and 9.68. The highest color removal efficiency was 75.7% when initial pH was at pH 7. 5. The removal of TOC and color was ended within 10 min. and the removal efficiency increased logarithmically within 10 min. However after 10 min., the removal efficiency of hardly increased. 6. The color removal efficiency was higher with modification of fentone oxidation than that with fentone oxidation by 5%. Optimal division dosage ratio was 1:1 and optimal dose timing ratio was 2:1. However the TOC removal efficiency was not higher with modification of Fenton oxidation than that with Fenton oxidation. 7. The COD_Mn/BOD_5 Ratio decreased with the time went by. It meant bioresolution increased as time went by. However, after 15 min., the COD_Mn/BOD_5 Ratio did not decrease any more. 8. In the case of H_2O_2 Division Dose experiment, the increase of bioresolution was highest at the H_2O_2 Division dosage Ratio of 3:7.
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