Removal of Cu---EDTA compounds via electrochemical process with coagulation

Effluent containing Cu---EDTA compounds has been effectively treated via electrochemical process with coagulation. Active Fe(OH)2 was generated at the anode and worked as coagulant with the assistance of electrolysis to remove cupric ions chelating with EDTA. In contrast, pure chemical coagulant failed to remove the cupric ions. The anodic reactions which occur on the electrode consist of Cu/Fe replacement, dissolution of iron and EDTA decomposition. The importance of each reaction with respect to operation variables has also been analyzed.