Inorganic arsenic mainly exists in water in the form of arsenite ions () and arsenate ions (). In the presence of dissolved oxygen, arsenite is eventually oxidized to the less toxic arsenate. The oxidation state of this anion has a significant negative effect on the arsenic removal rate of some treatment processes. Arsenic in non-ferrous metal smelting wastewater mainly exists in the form of extremely fine dust particles (~), which can be recovered. The soluble concentration of arsenic depends both on the characteristics of the arsenic compound and on the wastewater value. Separate treatment of acid leaching liquid and flushing liquid wastewater can recover the residual acid in the acid leaching liquid, which can not only reduce production costs, reduce the consumption of commercial acid, save procurement costs and transportation costs, but also reduce the cost of neutralization and treatment of waste acid, providing a basis for recycling. Lay the foundation for achieving zero emissions.
The acid flushing wastewater has a low value and cannot directly enter the desalination system. After pretreatment, the fatigue water after a large number of impurities have been separated enters the desalination system. This process has low operating costs and is suitable for enterprises with large processing volumes.
Zero discharge treatment of acid high arsenic wastewater in the metallurgical industry