The schematic experimental setup is shown in Fig. 1.The batch electrocoagulation cell was constructed of
plexiglas with the dimensions of 150mmh120mmh110mm.A digital dc power supply (WYK-503, 0-55V, 0-3.5A)
was used to give a regulated electricity current. The monopolar electrocoagulation unit consisted of ten electrodes,
each electrode was 120mmh70mm, the electrodes were dipped in the electrochemical reactor to a depth of 80 mm,
and the distance between electrodes was 10 mm. In this discontinuous system, 1 liter leachate was injected into the
water cell and the solution was agitated with a magnetic stirrer by the speed of 200 rpm. During the experiments, we
changed the electrode material, current density, electrolysis time, pH of solution and concentration of Cl
-. After 90
minutes settling, we measured the COD and NH3-N of the effluent.