Studies on Degradation of Reactive Red 135 Dye in Wastewater using Ozone

An attempt has been made in this paper to identify effects of efficient ozonation processes for decolorization and/or degradation of organic pollutants for environmental protection. In dyes, since the chromosphere groups with conjugated double bonds, which are responsible for color, can be broken down by ozone either directly or indirectly forming smaller molecules, thereby decreasing the color of the effluents. Ozonation and its combinations are effective for wastewater treatment. In the present study 99.9% decolorization of RR 135 was accomplished by ozonation. The time required for the complete decolorization gradually increase with increase in the initial dye concentration. For RR135 after 48, 55 and 67 min reaction time, complete decolorizaton was achieved at initial dye concentrations of 500, 1000 and 1500 mg/L, respectively. The COD removal efficiency gradually decreased with an increase in the initial concentration. For RR135 after 60, 65 and 87 min reaction time, the COD removal percentage was 66.66%, 61% and 56.64% at initial dye concentrations of 500, 1000 and 1500 mg/L, respectively.