چكيده به لاتين
In this study application and efficiency of electrocoagulation in the removal of nickel and iron from power-plant real wastewater have been evaluated. Steel electrode (St 12) is used as anode and cathode which is connected with parallel mono-polar configuration. The influence of initial pH, electrical current (A), electrode distance and electrolysis time was investigated in a stirred batch reactor. Study was conducted in a two phase. In phase I, changes in range of parameter were made in order to obtain optimum efficiency. 7, 1.5 cm, 2 A and 15 min are the values acquired in phase I for initial pH, electrode distance electrical current and reaction time with the efficiency of 99.23% and 99.6% for removal of nickel iron respectively. In phase II, operational parameters were optimized with RSM method and result from this phase demonstrated high correlation between experimental and predicted values (99.5% and 99.6% for iron and nickel respectively). 8.1, 1 cm, 1.5 A and 18 min obtained by experimental design as optimum condition for initial pH, electrode distance, electrical current and electrolysis time. 99.9% and 99.8% removal efficiency were achieved under these conditions for nickel and iron respectively.
Keywords: Electrocoagulation, nickel, iron, response surface methodology, wastewater treatment
