[Performance of Elecrocoagulation process in cyanid removal from synthetic wastewater by Al electrod and using MgO as a coagulant aid]

Background and objectives: Cyanide ion is one of the most dangerous compounds for the man. Electrocoagulation process with high efficiency to removing pollutants, than researchers considered a effective process. The aim of this study was to determine the efficiency of electrocoagulation process by aluminum electrodes in cyanide removal from synthetic wastewater using magnesium oxide as a coagulantaid.

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Mehods: In this study, a reactor with four aluminum electrodes with dimensions 200 × 20 × 2 mm use of 1 Liter of useful volume of electricity generating device for the removal of cyanide was used. Effect of parameters such as pH[3-9], voltage [10-30 V], the initial concentration of cyanide[50-500 ppm] and different concentrations of magnesium oxide particles [0.1 to 1 mg l] as coagulant aid in the process were investigated.

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Results: The results show that the efficiency of EC process at pH 5, voltage of 30 V and an initial concentration of cyanide, 50 mg/lit in 45 minutes, was 80 percent. process will Efficiency by adding coagulant aid. In optimal amounts of coagulant aid [0.1 mg/lit] in electrocoagulation process on the removal of the cyanide 90% was achieved.

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Conclusion: Electrocoagulation process is suitable process for the removal of cyanide. Also, Magnesium Oxide as a coagulant aid in this process was good and increase process efficiency.