ENVR 36 |
| Chengqiang Wu, Min Yang, and Jianmeng Chen. |
| The Fenton process was employed to remove the non-biodegradable humics from landfill leachate and its coagulation mechanism was investigated. The humics removal occurred mainly through coagulation in the Fenton process and its coagulation flocs presented more than adsorption performance. At an H2O2 of 150 mg L-1 and FeSO4 of 500 mg L-1, humics removal by hydroxyl radical oxidation was only 20% and their removal by coagulation was about 55%. The coagulation has the priority to remove the humics of large molecular sizes mainly by adsorption of coagulation flocs. The optimal pH of coagulation for total organic carbon removal was 3.5 ~ 4.5 and changed with different dosages of H2O2 and FeSO4. With the increase of pH, the humics of larger molecular sizes desorbed quickly from coagulation flocs but the one of smaller molecular sizes did slowly. It showed that coagulation performance was largely decided by pH of coagulation in the Fenton process. |
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Environmental Occurrence, Fate and Transport of Chemicals and Nanomaterials
8:30 AM-12:05 PM, Monday, 27 March 2006 Georgia World Congress Center -- B217, Oral
Division of Environmental Chemistry |