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Abstract:Landfill leachate is a toxic effluent of a decomposing landfill. It is produced when rainwater percolates through the landfill leaching out contaminants and pollutants. Untreated leachate is a potential source for the contamination of soil, surface and ground water. In this study, the treatment processes such as granular activated carbon (GAC) adsorption/bio-sorption (batch) and advanced oxidation were evaluated using synthetic landfill leachate (SLL) as a contaminant. Advanced oxidation of SLL was studied using Fenton's reagent (H 2 O 2 /Fe +2 ). The total organic carbon (TOC) removal efficiency (of landfill leachate) was evaluated for sequential adsorption/bio-sorption (on GAC) and Fenton process and compared with photocatalysis. The percent TOC removed by GAC bio-sorption at the peak bio-growth was 85, 92 and 97 % for the 20, 40 and 60 g/l GAC respectively.The Advanced oxidation process removed 60% of the TOC at an optimum dose of Fenton's reagent (15 and 400 milli moles of Fe +2 and H 2 O 2 ). Photo-catalysis with TiO 2 removed only 30% of the TOC. The TiO 2 coated on powdered activated carbon (PAC) as a photo catalyst led to even lower TOC removal of less than 7%.

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