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How To Deal With Cyanide-containing Wastewater?
- Jul 05, 2018 -

How to deal with cyanide-containing wastewater?

The cyanide-containing wastewater mainly comes from the departments of electroplating, gas, coking, metallurgy, metal processing, chemical fiber, plastics, pesticides, and chemicals. Cyanide-containing wastewater is a kind of toxic industrial wastewater. It is unstable in water and easy to decompose. Inorganic cyanide and organic cyanide are highly toxic substances. People can cause acute poisoning by ingestion. The lethal dose of cyanide to human body is 0.18, and the potassium cyanide is 0.12g. The mass concentration of cyanide in fish in water is 0.04 to 0.1 mg/L.

The treatment measures for cyanide-containing wastewater mainly include: (1) reforming the process to reduce or eliminate the effluent containing cyanide, such as the use of cyanide-free plating to eliminate industrial wastewater from the electroplating plant. (2) Waste water with high cyanide content should be recycled. Waste water with low cyanide content should be purified before being discharged. The recovery methods include acidification aeration-alkali absorption method, steam desorption method, and the like. The treatment methods include alkaline chlorination method, electrolytic oxidation method, pressurized hydrolysis method, biochemical method, bio-iron method, ferrous sulfate method, air stripping method, and the like. Among them, the alkaline chlorination method is widely used, the ferrous sulfate method is not thorough and unstable, and the air stripping method not only pollutes the atmosphere, but also fails to meet the discharge standard and is less used.