Electrochemical treatment of waste water from nickel in galvanic production

In the production of metal coating by electroplating, wastewater containing the metal ions is used. The paper presents the study results of cleaning waste water of nickel after electroplating. Wastewater treatment was implemented in an electrodialysis plant. The initial wastewater contained from 20 to 80 mg/l of nickel II. Experimental results obtained by studying the electrodialysis extraction of nickel from wastewater of electroplating plants, indicate that the cleaning process is influenced by such factors as the effluent treatment time, the current load on the electrodialyzer, the initial metal concentration in the effluent. The increase in voltage in the electrodialysis plant leads to an increase in the treatment efficiency. So after six hours of processing, the processing rate during nickel extraction increases from 39 to 66.5% with an increase in voltage from 40 to 100V. Along with cleaning wastewater of nickel electrolyte, the electrodialysis method allows obtaining concentrates of this electrolyte containing from 260 to 1230 mg/dm3 of nickel and suitable for use in the electroplating process.