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首页> 外文期刊>Journal of environmental science and health, Part A. Toxic/hazardous substances & environmental engineering >Removal of COD from a stabilized landfill leachate by physicochemical and advanced oxidative process
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Removal of COD from a stabilized landfill leachate by physicochemical and advanced oxidative process

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This work investigated the effectiveness of a physicochemical and oxidative process for the removal of chemical oxygen demand (COD) from stabilized landfill leachates. The application of these technologies for landfill leachate treatment greatly depends on the optimal operating conditions for a specific leachate. Coagulation-flocculation followed by H2O2, Fenton and photo-Fenton processes was evaluated. Advanced oxidation processes were evaluated in the raw leachate and the leachate pretreated by coagulation-flocculation. Via the coagulation process, at 30 sec and a stirring speed of 150rpm followed by flocculation and settling steps, 53 COD was removed at an optimal dose of 1400mg L-1 and pH 4.0. Moreover, from the POA evaluated, the Fenton process was determined to be the most effective process for removing COD from the leachate pretreated by coagulation-flocculation, reaching 83.3 COD removal with 1330mg L-1 of H2O2 and 266mg L-1 of Fe2+. The photo-Fenton process applied directly to the raw effluent was effective for the removal of COD; a 75 reduction in COD was observed in tests using 2720mg L-1 of H2O2 and 544mg L-1 of Fe2+. Due to the variability in the composition of the Gramacho landfill leachate, the combination of coagulation-flocculation and the Fenton process is an effective technology for reducing the COD in samples of this leachate.

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