The main sources of zinc in electroplating and metal processing industry are electroplating or pickling liquid. The waste water is transferred to the rinse water after rinsing with metal. The pickling process involves the removal of metal (zinc or copper) in a strong acid to remove the oxide from the surface, and then the treatment of the brightening agent containing a strong chromic acid. The wastewater contains large amounts of hydrochloric acid and zinc, copper and other heavy metal ions and organic brighteners, toxicity, and some also contain carcinogenic, teratogenic, mutagenic toxic substances, great harm to humans. Therefore, the electroplating waste water must be recycled, so as to eliminate or reduce the pollution to the environment.
 

   Electroplating wastewater treatment equipment by regulating tank, dosing tank, tank, reaction tank, and the reduction of pH regulating pond, flocculation, sedimentation, filter press, clear water tank, air floatation reaction, activated carbon filter etc.. Electrolytic treatment process in iron by gas processing, modification technology is mainly through activation of industrial scrap iron purification wastewater, when the water contact with the filler, electrochemical reaction, chemical reaction and physical function, including the comprehensive effect of catalysis, oxidation, reduction, replacement, co precipitation, flocculation, adsorption, various metal ions the removal of exhaust gas, purify the waste gas.