j behin - Chemical Engineering Department, Faculty of Engineering, Razi University, Kermanshah, Iran
m parvizi - Chemical Engineering Department, Faculty of Engineering, Razi University, Kermanshah, Iran

The decolorization process of the acid blue 161 dye (C40H20CrN4O10S2 .H. 2Na) was carried out by bubbling ozone at the bottom of an airlift reactor containing the dye solution. The effect of initialdye concentration, ozonated gas flow rate and solution pH on color removal efficiency wasstudied. The color removal efficiency was followed by measuring the dye concentration atdifferent times of the decolorization process. It decreases with increasing the initial dyeconcentration and pH. Ozonation was found to be an effective process for decolorization of acid blue 161 dye. After 30 min of ozone treatment, decolorization was nearly completed to a value of 97.16 %. This work also revealed that the applied gas flow rate has a considerable effect on decolorization by ozone in airlift reactor.

Airlift reactor, Dye decolorization, Ozonation, Textile effluent