It's huge. Jewelry wastewater contains a lot of metal ions, such as gold, silver, copper, nickel and chromium. These metal ions have high solubility in water and are difficult to treat. In addition, they also contain many complex organic pollutants, such as cleaning agents, oil stains, etc., which are not easy to decompose and increase the difficulty of wastewater treatment. Treatment of jewelry wastewater requires a variety of treatment methods, such as chemical precipitation, ion exchange, electrochemistry and adsorption.