Study on advanced treatment of landfill leachate by Fenton oxidation coupled with active carbon adsorption

Key words: 
• Fenton oxidation /
• active carbon /
• landfill leachate /
• wastewater treatment

Abstract: The treatment of landfill leachate by Fenton oxidation coupled with active carbon adsorption was studied. The effects of the addition mode, H2O2 concentration, Fe2+ concentration, active carbon dosage, temperature, and pH on COD removal were investigated. Test results showed that the best COD removal efficiency could be achieved under the mode of addition of active carbon for 30 min absorption followed by 150 min Fenton oxidation. Orthogonal tests showed that the order of the operational factors according to the importance to the COD removal should be active carbon dosage, Fe2+ concentration, temperature, H2O2 concentration, pH. The optimistic conditions were active carbon dosage 16 g/L, Fe2+ concentration 29 mmol/L, temperature 60℃, H2O2 concentration 78 mmol/L, pH 3.