| Title |
Fenton-like oxidation for the treatment of landfill leachate |
| Authors |
장윤영(Yoon Young Chang),최상일(Sang Il Choi),이철효(Cheol Hyo Lee) |
| Abstract |
The treatment of landfill leachate with hydrogen peroxide catalyzed by iron metal which is different from Fenton reaction in that the form of iron used is not ferrous ion but zero valent iron was investigated using a jar tester. The leachate (COD 1100㎎/L, pH 8) in a process line between an aeration lagoon and a Fenton oxidation tank in Kimpo Landfill, Seoul was sampled for test The average size of the iron metal (99.9%, from Junsei Co.) used in this study was analyzed by scanning electron microscope (SEM) and showed 10-100㎛ in diameter. Iron enhances the decomposition of hydrogen peroxide with the reaction which proceeds in two steps: the oxidation of zero valent iron to ferrous iron followed by the oxidation of ferrous iron to ferric iron under reductive conditions. The effectiveness of the iron catalyst for the destruction of chemical oxygen demand (COD) of the landfill leachate was monitored, focused on the process variables of H₂O₂ and Fe° concentrations, and solution pH. The iron particles were pretreated before use by washing with 1 M HCl and then rinsing with distilled water and aceton followed by N₂ purging in a glass column. The oxidation reactions were almost complete within 30min and the more apparent change in H₂O₂ and COD consumption and pH was not observed. The most sensitive process variable on the COD oxidation reaction was solution pH and the oxidation of COD at low pH provided greater than 66% COD removal. The continuous treatment of landfill leachate in a glass column packed with Fe° and activated carbon shows that the Fenton-like oxidation can be an effective tool for either in situ or above-ground treatment of landfill leachate. |