From the non-ferrous metal production, electroplating, mining, chemical and other enterprises, mainly from the mine drainage, leachate drainage, tailings waste fields, nonferrous metal smelting factory dust drainage, drainage industry PCB. The types, contents and forms of heavy metal ions in wastewater were different with different kinds of production. Heavy metals can not be degraded and destroyed, but migration and transformation. OH- in water, Cr, SO4, NH4+, organic acid, amino acid, humic acid, can form complexes or chelates with heavy metals, the heavy metal concentration in the water increases, also can make the heavy metals in the sediment released.
 

   The treatment of heavy metal wastewater usually can only transfer their existing position and transfer their physical and chemical forms, can be divided into two categories: one is to make a change in the heavy metal wastewater dissolved into insoluble compounds or heavy metals, by sedimentation and floating removal from wastewater can be used, and sink method, sulfide precipitation, floatation separation, ion flotation, electrolytic deposition or electrolysis on the float, diaphragm electrolysis; two is the concentration and separation of heavy metals in wastewater without changing its chemical form under the condition of application of reverse osmosis method, evaporation method, ion exchange method, etc.. Our company according to the actual situation of the owners of the corresponding process design.