Removal of Copper-Cyanide Complexes from Electroplating Industry Effluents by Ion-Exchange Fiber

摘要

Removal of copper-cyanide complexes from electroplating industry effluent were studied by using an ion-exchange process. A kind of polypropylene strong alkaline anion exchange fiber was used to perform packed beds continuous experiments. The conditions of adsorption were wastewater pH value 9.0 and flow rate 90-120 BV·h~(-1) at room temperature. The packed beds were exhausted at 1300 bed volumes for copper-cyanide complexes The elution of copper-cyanide complexes from ion-exchange fiber was studied. The results showed that copper-cyanide complexes were easily eluted from ion exchange fiber using either 2.0 mol·L~(-1) NaNO_3 or NaCl. With 1.0 mol·L~(-1) NaNO_3 solution at 30 BV·h~(-1), the regenerating rate of copper-cyanide complexes was more than 95%.