Cyanide oxidation by ozone in a steady-state flow bubble column

Cyanide oxidation by singlet oxygen generated via reaction between H 2 O 2 from cathodic reduction and OCl − from anodic oxidation

“…In the beginning of this experiment, the electric voltages measured were 5.1, 4.2 and 2. (6). But, furthermore increase of sodium chloride concentration had a slight effect on the cyanide removal efficiency.…”

“…However, these processes could generate highly concentrated products in which toxic cyanides still exist, which need additional treatments. Recently into less harmful products via oxidation methods have been reported, which include ozonation [6], electrochemical oxidation [7], photocatalysis [8], ferrate oxidation [9], wet oxidation [10] and alkaline chlorination [11]. Among them, alkaline chlorination is a practical method due to its low operation cost and stable treatment effect.…”

Cyanide removal with a copper/active carbon fiber Cathode via a combined oxidation of a Fenton-like reaction and in situ generated copper oxides at anode

“…Alkaline chlorination is widely used for the cyanide removal, which will lead to the formation of toxic cyanogens chloride [7] and chloride disinfection by-products [8]. By contrast, cyanides can be directly converted into less harmful products by employing oxidation methods, such as ozonation [9], electrochemical oxidation [10,11], photocatalysis [12,13], ferrate oxidation [14,15] and wet oxidation [16].…”

Wet oxidation characteristics of metal cyanide complexes below 423 K

“…However, toxic chlorinated organic compounds can be formed in this treatment (Parga and Cocke, 2001;Desai et al, 1998). The formation of undesirable by-products can be avoided by using cyanide oxidation method with hydrogen peroxide or ozone, but the high costs of the oxidation agents decreases the actual application of hydrogen peroxide or ozone in the cyanide decomposition (Sarla et al, 2004;Barriga-Ordonez et al, 2006). Therefore, new methods for cyanide decomposition are still being studied and among these new methods, the wet oxidation has attracted many researchers.…”