Abstract
A fundamental investigation was carried out on electrolytic oxidation of the electroless copper plating waste. The electroless copper plating waste from which EDTA has been recovered still contains the unrecovered EDTA, formaldehyde, methanol and formic acid and is high in COD. Any of these components was readily oxidized using a lead dioxide anode at an anodic current density of 1-6 A/dm2 and at a pH of 1.0-7.0. Recovery of EDTA from the electroless copper plating waste followed by electrolytic oxidation under the same conditions as above reduced COD from 1, 400ppm to 10ppm and at the same time caused deposition of the residual metal ions on the cathode. Furthermore, the waste treated in this manner did not interfere with the subsequent chemical treatment for removal of heavy metals and could be discharged after such treatment.
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