Electroplating wastewater discharge

Maximum Permissible Concentrations of Electroplating Wastewater Discharge to Surface Waters... 

Treatment of Electroplating Wastewater. Toxic cyanide ions are the major pollutant in electroplating wastewater. They must be removed before discharge of the wastewater. As shown in Eqs. (3) and (4), ozone can oxidize free cyanide ion rapidly to less toxic cyanate ion, which then slowly hydrolyzes to nitrogen and ammonia. The reaction equations are as follows " ... 

A drop-in replacement that requires no new equipment is more likely to be adopted than one that requires major purchases of new equipment. If more equipment has to be added to space that is not in the present plant, then the cost of expanding the building must be considered. Some process changes can involve major changes to equipment unfamiliar to the current personnel. For example, discharge of heavy metal ions in the wastewater from an electroplating plant can be avoided by vacuum metallization, chemical vapor deposition, and other such. The equipment will be quite... 

Chromium VI is one of the major contaminants in industrial wastewater, particularly for metal processing activities, such as electroplating, for example. Because of its toxicity, its maximum concentration in treated wastewater must generally be 50 ig/L before being discharged into a receiving medium. 

---