Meghdad Pirsaheb
Esmaeil Azizi
Ali Almasi
Mohammad Soltanian

Landfilling leachate contains high concentrations of organic and inorganic pollutants. The present study is aimed to evaluate the efficiency of the electrocoagulation system in removing chemical oxygen demand (COD) and ammonia nitrogen (NH4-N) from leachate. The paper studies the factors affecting the removal efficiency, such as current density (187.5, 375, 562.5 Am-2), electrode material (Al and Fe), electrolysis time and pH of the solution (6.5 ±0. 2). The results indicated that in operating condition the highest COD and NH4-N removal efficiencies were 66% and 63%, respectively. According to the results the performance of the Al electrode was better than the Fe electrode in term of COD and NH4-N removal. Therefore, the results show that the electrocoagulation can be applied to leachate pre-treatment as a feasible and reliable technique.

Electrocoagulation, Landfill leachate, COD, NH4-N