1 Treatment of landfill leachate by the Fenton process 1 Yang Deng*, James D. Englehardt 2 Department of Civil, Architectural and Environmental Engineering, McArthur 3 Building Room 325, 1251 Memorial Dr., University of Miami, Coral Gables, Florida, 4 33146, USA 5 Abstract 6 In recent years, studies of leachate treatment by conventional Fenton, photo- 7 Fenton and electro-Fenton processes have indicated that these methods can effectively 8 reduce concentrations of organic contaminants and color. In addition, the process can 9 increase the biodegradable fraction of organic constituents in leachate, particularly in 10 mature or biologically recalcitrant leachate. Oxidation and coagulation both play 11 important roles in the removal of organics. Initial pH, dosages of Fenton reagents, 12 aeration, final pH, reagent addition mode, temperature, and UV irradiation may 13 influence final treatment efficiency. In this paper, current knowledge of performance 14 and economics of Fenton processes for treatment of landfill leachate as reported for 15 laboratory, pilot and full-scale studies is reviewed, with the conclusion that the Fenton 16 process is an important and competitive technology for the treatment or pretreatment 17 of landfill leachate. 18 Keywords: Fenton treatment; Landfill leachate; Oxidation; Coagulation 19 * Corresponding Author. Tel: 305-284-2015; Email address: dengyang7@gmail.com 20 21