Precipitation Method for Electroplating Wastewater Treatment

The wastewater and waste liquid generated in electroplating production contain a large amount of metal ions. In order to further regenerate and utilize resources, we need to treat electroplating wastewater. Below, Jiangsu Haipu Functional Materials, a manufacturer of electroplating wastewater treatment, introduces the precipitation method for electroplating wastewater treatment as follows:

(1) Neutralization precipitation method. Adding alkali to electroplating wastewater containing heavy metals for neutralization reaction to separate the heavy metals into insoluble hydroxide precipitates. The neutralization precipitation method is simple to operate and is a commonly used method for treating wastewater.

(2) Sulfide precipitation method. The method of removing heavy metal ions in electroplating wastewater by adding sulfides to form sulfide precipitates. Compared with neutralization precipitation method, the advantage of sulfide precipitation method is that the solubility of heavy metal sulfides is lower than that of their hydroxides, the reaction pH is between 7-9, and the treated wastewater generally does not need neutralization, resulting in better treatment effect. However, the disadvantage of sulfide precipitation method is that the sulfide precipitation particles are small and easy to form colloids. Sulfide precipitation remains in water and generates gas when encountering acid, which may cause secondary pollution.

(3) Chelation precipitation method. By using polymer heavy metal capture and precipitation agents to rapidly react with heavy metal ions such as Hg2+, Cd2+, Cu2+, Pb2+, Mn2+, Ni2+, Zn2+, and Cr3+in wastewater at room temperature, insoluble chelating salts are generated. Then, a small amount of organic or (and) inorganic flocculants are added to form flocculent precipitates, thereby achieving the goal of capturing and removing heavy metals.

For more information on electroplating wastewater treatment, please continue to follow the official website of Jiangsu Haipu Functional Materials, a manufacturer of electroplating wastewater treatment.