Which treatment process is best for metal wastes containing cyanide?

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Multiple Choice

Which treatment process is best for metal wastes containing cyanide?

Explanation:
Destroying cyanide by oxidizing CN- to cyanate under alkaline chlorination is the proven approach for metal wastes containing cyanide. Adding chlorine in a strongly alkaline medium quickly converts cyanide to cyanate, a far less toxic species that stays dissolved, while also preventing the formation of toxic hydrogen cyanide gas. This method is specifically designed for cyanide in metal-containing wastes, enabling safe disposal or further treatment. Other approaches don’t reliably break CN- bonds or, in neutral conditions, can leave cyanide still hazardous, making alkaline chlorination the most effective choice.

Destroying cyanide by oxidizing CN- to cyanate under alkaline chlorination is the proven approach for metal wastes containing cyanide. Adding chlorine in a strongly alkaline medium quickly converts cyanide to cyanate, a far less toxic species that stays dissolved, while also preventing the formation of toxic hydrogen cyanide gas. This method is specifically designed for cyanide in metal-containing wastes, enabling safe disposal or further treatment. Other approaches don’t reliably break CN- bonds or, in neutral conditions, can leave cyanide still hazardous, making alkaline chlorination the most effective choice.

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