Heavy Metal Wastewater
Heavy metal wastewater mainly comes from wastewater discharged from mines, smelting, electrolysis, electroplating, pesticides, medicine, paints, pigments and other enterprises. Among them, heavy metals are not decomposed and destroyed by various common methods, but can only transfer their existence and change their physical and chemical forms. The treatment of heavy metal wastewater can be divided into two categories: one is to dissolve the wastewater. The heavy metal is converted into an insoluble metal compound or element, and is removed from the waste water by precipitation and floating. The neutralization precipitation method, the sulfide precipitation method, the floating separation method, the electrolytic precipitation method, the diaphragm electrolysis method, etc. may be used; The heavy metal is concentrated and separated without changing its chemical form, and may be reverse osmosis, electrodialysis, evaporation, ion exchange, or the like.