The batch experimental setup is schematically shown in Fig 1, which consists of an electrochemical reactor, a D.C. power supply and iron electrodes. The bench scale (BS) unit was made of Plexiglas with reactor volume 1 L, which equipped with four pair of electrodes, made of iron as anodes with the dimensions of 100 mm× 120 mm × 2 mm with effective area of 92 cm2. The distance between the electrodes is 10 mm. Electrodes were connected to a digital DC power supply (model-YX-360TR-EB) in bipolar-parallel mode.