Treatment of mature landfill leachate by electrocoagulation followed by Fenton or UVA-LED photo-Fenton processes

The main objective of this study is to optimize a two-step treatment for mature landfill leachate consisting electrocoagulation (EC) followed by Fenton or UVA-LED photo-Fenton processes aiming provide more efficient and feasible alternative strategy that also increases biodegradability decreases conductivity. Although 5 mA cm−2 EC cheaper than 10 per kg removed COD (0.63 vs. 0.89 € kgCOD−1), it achieved the half total removal (13% compared 26%), low residual iron concentration (100 mg L−1) remained at end process made necessary long time perform posterior (48 h) (6 process. When was performed cm−2, (220 high enough reduce one both processes. Consequently, cost from 5.91 3.48 kgCOD−1 + ([H2O2]/COD = 1.063) combination; whereas slightly 1.68 1.61 conventional combination. In cases, around 87%. addition, SUVA >40%, conductivity reduced about 20–30%, (BOD5/COD) increased over 0.3.