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In this study, the effectiveness of the electrocoagulation (EC) process was evaluated based on the reduction of organic and nitrogenous contaminants in landfill leachate. A three-compartment electrochemical reactor as pre-treatment of stabilized landfill leachate was carried out ahead of biological treatment. The removal efficiencies of COD, BOD, ammonia, and nitrate were analyzed at pH 4, 6, and 8 with the current densities of 20.83 and 29.17 mA•cm -2 . At pH 4, the highest removal of COD and NH 4 + was obtained, i.e., in the range of 72-81% and 43-59%, respectively. The ratio of BOD 5 /COD was increased after EC, from initially 0.11 to 0.32 at pH 4. In addition, EC effectively removed humic substances in the leachate by targeting a large amount of high molecular weight humic substances, with around 10 3 kDa. However, the higher removal efficiency observed at higher current density leads to higher specific energy consumption. At a current density of 29.17 mA•cm -2 , the specific energy consumption obtained in EC was around 10-17 Wh•g -1 COD and 99-148 Wh•g -1 NH 4 + . This could be decreased up to 50% at an applied current density of 20.83 mA•cm -2 with slightly lower efficiencies.

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