PCB electroplating wastewater containing chromium is mainly wastewater, wastewater containing cyanide, other waste (including copper, nickel, zinc).
Since the PCB plating, passivation, stripping operations such as electroplating bath commonly used in long-term use or have accumulated a lot of other metal ions, so many factories for the control of these impurities in the bath in the range of technology licensing, the groove liquid waste part, addition of new solutions, and some of these failures bath factories all discarded. These various concentrations of heavy metal ions in solution generally have a high concentration of waste and impurities accumulated a lot, not only different types of pollutants, and the concentration of major pollutants, media concentration, and the solution of other metal impurity ions also tend to have larger differences.
