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In this study, electrochemical treatment and application of O 3 /UV/H 2 O 2  in various combinations were evaluated in respect to their efficiency to depurate mature landfill leachate. Based on preliminary experiments, electrochemical treatment using stainless-steel electrodes at 2 cm gap was performed optimally at 50 mA/cm 2  and pH 6, while application of O 3  at 120 L/h, UV at 991 J/cm 2  and H 2 O 2  concentration of 1 g/L was carried out. Electrochemical treatment and O 3 /UV/H 2 O 2  under optimal conditions were applied as follows: I) electrochemical treatment, followed by O 3 /UV/H 2 O 2  and solids precipitation, II) electrochemical treatment, followed by precipitation and then by O 3 /UV/H 2 O 2  treatment, and III) O 3 /UV/H 2 O 2 , followed by electrochemical treatment. A low performance was observed when O 3 /UV/H 2 O 2  preceding electrochemical treatment. Solids, TKN and total COD (tCON) removal was primarily achieved through electrocoagulation, whereas color and soluble COD (sCOD) reduction was mainly attributed to electrochemical oxidation. Experimental setup I was the most efficient treatment scheme, resulting in tCOD, sCOD, TKN, TSS, SAC UV254nm  and color number reduction of 73%, 80%, 76%, 79%, 94% and 98%, respectively. Indeed, O 3 /UV/H 2 O 2  step could be omitted since its effectiveness was restricted during landfill leachate treatment. In conclusion, electrochemical treatment followed by precipitation could result in effective reduction of nutrients and color.

Evaluation of electrochemical and O 3 /UV/H 2 O 2 methods at various combinations during treatment of mature landfill leachate