Metallurgical Electronics:Electroplating industry

The primary source of zinc in wastewater from the electroplating and metal processing industries comes from drag-out solutions used in electroplating or pickling baths. During the rinsing process, these pollutants are transferred into the wastewater stream.  

The pickling process typically involves first immersing metals (such as zinc or copper) in strong acids to remove surface oxides, followed by treatment in brightening solutions containing chromic acid to enhance surface finish. The resulting wastewater contains high concentrations of hazardous substances, including hydrochloric acid, zinc, copper, and organic brighteners. These contaminants are highly toxic, with some even classified as carcinogenic, teratogenic, or mutagenic, posing severe risks to human health and the environment.  

Given the severe environmental and health hazards, electroplating wastewater must undergo thorough treatment and recycling to minimize or eliminate its harmful impact. Proper filtration and purification systems are essential to recover valuable metals and ensure compliance with environmental regulations.