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Degradation of eight commercial reactive azo dyes with different structures containing different substituted groups has been investigated in a semi-batch reactor by ozonation individually and in mixture. The results showed that pH 10 was effective for color and COD removal of these dyes. Different dyes needed different time of ozonation for decolorization. Dyes even if decolorized to 95–99%, COD removal...
In this research, ozonation of H-acid, a dye intermediate was studied in a semi batch reactor. The effect of pH and ozone dose on decolorization and degradation of H-acid was studied. The results showed that pH 11.5 was effective for color and COD removal. Both color (98.7%) and COD (87.8%) could be removed by 30 min of ozonation at an ozone dose of 4.33 mg/l. Oxidation and cleavage of substituent...
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