Ozone Treatment of Cyanide-Bearing Plating Waste.

摘要

The use of ozone for CN destruction in the metal finishing industry has long been recognized as a technically attractive alternative to chlorine oxidation. High capital cost has,in earlier years,prevented its implementation. This report documents a full scale installation in which it was demonstrated that alkaline cyanide waste could be effectively destroyed to levels well below 1ppm and with CN(-) removals of 99% at the levels normally encountered,thus satisfying BATEA requirements. Design features,problems and capital and operating cost data are presented and discussed. Selected aspects of the cyanide-ozone reaction were also studied,such as the effect of CN(-)/O3ratios,cyanide source and concentration and the effectiveness of ozone for cyanate elimination.