Letter 25035

Water treatment with CN  

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Which is the ideal treatment for an effluent of brass/copper bath with CN (NaCN, CuCN, Zn(CN)2? As I can eliminate the CN and precipitate the metallics ions?

Diogo Cavalcanti
Home Hardware - Caxias do Sul, RS, Brazil

The ideal treatment always depends on the circumstances, Diogo, but the most comon treatment is 2-stage alkaline chlorination using either hypochlorite or chlorine gas and sodium hydroxide.

 
Ted Mooney, P.E.
finishing.com Inc. - Brick, NJ

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