Degradation and decolorization of reactive red X-3B aqueous solution by ozone integrated with internal micro-electrolysis

Abstract: Ozone integrated with internal micro-electrolysis (O3/IE) was applied to electrochemically oxidize reactive red X-3B owing to its well-established synergetic effect in the present study. The final removal rates of color, COD, TOC and AOX were found to be 99%, 85%, 59%, and 74%, respectively, when the following optimal conditions were used: dyestuff concentration of 1g/L with a pH of 9.0, a reaction temperature of 60°C, 400g of iron scraps with the diameter in the range of 0.9–2.0mm and 10g/h ozone flow rate. The dominant degradation mechanism of reactive red X-3B was elucidated by the addition of radical scavenger/enhancer. The results indicated that the formation of hydroxyl radicals in the presence of ozone was the major contributing factor in O3/IE system. [ABSTRACT FROM AUTHOR]