[Survey of efficiency of electrochemical treatment in cyanid removal from industrial wastewaters]

ABSTRACT

Cyanide is a highly toxic compound which is Normally found in numerous industries, such as electroplating wastewater. Release of this compounds in to the Enviroment has a lot health hazards.The Purpose of this study is to Determine the efficiency of electrochemical oxidation method for Cyanide removal from industrial wastewaters. This study conducted in a pilot system experimentally .In this study the effect of pH, voltage and operation time on total cyanide removal from industrial wastewaters by Electrochemical Oxidation was investigated by applying a Stainless Steel as a Anode and copper as a cathode. The average percentage removal of cyanide was about 88 with SD=2.43. The optimal condition obtained at voltage of 9V and pH=13 and The operation time of 90 minutes. The volume of sludge which formed in this condition was about 20 percent of a one liter pilot reactor. The results statistically confirmed the significant relationship between input and cyanide concentration removal efficiency [p< 0.05], and confirmed The this confirmed The relation between cyanide and cyanat oxidation and hydroxyl ions consumption 12.[L.Szpyruowicz]. therefore the best pH is 12.5-13.5 by Considering the need of alkaline environment to remove cyanide