Wastewater treatment methods for removing heavy metals can generally be divided into two categories:
Method 1: It is to convert the heavy metal in the dissolved state into an insoluble metal compound or element, which is removed from the wastewater by precipitation and floating. Applicable methods such as neutralization precipitation method, sulfide precipitation method, floating separation method, electrolytic precipitation (or floating) method, diaphragm electrolysis method ect;
Method 2: The heavy metal in the wastewater is concentrated and separated without changing its chemical form. The applicable methods include reverse osmosis, electrodialysis, evaporation and ion exchange. These wastewater treatment methods should be used singly or in combination depending on the quality of the wastewater, the amount of water, and other situation.