Abstract
An effective electrochemical approach for simultaneous silver recovery and cyanide removal from electroplating wastewater was presented. Accordingly, pulse current (PC) electrolysis with parameters including voltage (4.0 V), frequency (800 Hz), and duty cycle (50%) were settled using static cylinder electrodes. Then the influences of technological conditions on the electroplating wastewater treatment process were investigated, which manifested that the concentration of silver ions in electroplating wastewater could be reduced from 221 to 0.4 mg L–1 and cyanide could be simultaneously removed from 157 to 4.9 mg L–1 after 3.0 h of PC electrolysis at pH 9.5 ± 0.5, aeration rate of 100 L h–1, and stirring speed of 1000 rpm with NaCl addition of 0.05 mol L–1 at room temperature. The results of XRD and EDX analysis showed that the silver deposits on the cathode were crystalline in face centered cubic structure and had a high purity.
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