Recovery of nickel and removal of COD from chemical nickel plating waste water was investigated by electrolytic oxidation. Nickel was completely recovered as metal and COD was readily oxidized using a lead dioxide-titanium anode under the following conditions: anodic current density 2-4A/dm², pH 4-6, temperature 50°C.
In the next place, adsorption and recovery of nickel from chemical nickel plating rinse water was investigated using chelating resin (UR-30) containing iminodiacetic acid groups by batch and column methods. UR-30 showed a satisfactory adsorption ability for nickel under the following conditions: loading solution, nickel about 80mg/l, SV 2-10, pH 3-9. The elution of nickel was accomplished by passing 4N hydrochloric acid solution through the column.

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