Cyanide containing wastewater mainly comes from electroplating, gas, coking, metallurgy, metal processing, chemical fiber, plastic, pesticide, chemical industry and other departments.
Cyanide-containing wastewater is a kind of highly toxic industrial wastewater, which is unstable in water and easy to decompose. Both inorganic cyanide and organic cyanide are toxic substances, and human consumption can cause acute poisoning.
Cyanide has a fatality rate of zero.
18. Potassium cyanide is 0.
12g. The mass concentration of cyanide in water is 0.
04 a 0.
The treatment measures of cyanide containing wastewater mainly include :(1) reforming the process, reducing or eliminating the effluent of cyanide containing effluent, and eliminating the industrial effluent of the electroplating workshop by the method of non-cyanide plating.
waste water with high cyanide content shall be recycled, and wastewater with low cyanide content shall be purified and discharged.
The recovery methods include acidizing aeration, alkali absorption, steam desorption, etc.
The treatment methods include alkaline chloride method, electrolytic oxidation method, pressurized hydrolysis method, biochemical method, biological iron method, ferrous sulfate method, air blowing method and so on.
Among them, alkaline chloride method is widely used, ferrous sulphate method is incomplete and unstable, and air purge method not only pollutes the atmosphere, but also fails to meet the discharge standard.