A Catalytic Ozonation of the Wastewater

Abstract

Water pollution and its scarcity are the main problems that mankind is facing nowadays. It is necessary to remove color and pollutants from dying industrial effluents by using the chemical or physical treatments. In this regards, great attention was being given to the removal of these pollutants from waste water by using an advanced oxidation processes (AOPs) which are based on generation of highly reactive species, especially hydroxyl radicals and other reactive mechanism. Among them, ozonation and catalytic ozonation were operating at room conditions of pressure and temperature, are of special interest involving some other operational costs. There were many different types of catalyst used in catalytic ozonation of waste water treatment at different operating condition like pH (2, 4, 6, 8, 10), time for the reaction, catalyst quantity, concentration (500 and\ 1000 ppm), ozone flow-rate (30, 40 and 50 LPH) and temperature (15° C, 25° C and 35° C) etc. The reaction will be occurred at different operating condition and remove organic and inorganic pollutant from waste water and also remove color and COD, TOC and other pollutants.

For the experiment, bubble column pyrex glass reactor was used. Reactive Red 120 (RR 120) and Reactive Yellow 145 (RY 145) these both dyes are used for all experiment. These all experiment were done by using advance oxidation process like Ozone (O3), O3+UV, O3+Catalyst and O3+UV+Catalyst. In the experiment two different catalyst were used like TiO2 which is prepared by using method which is given in literature and the 20 % Gamma- Al2O3 catalyst were used which is prepared by wet- impregnation method. These processes given the color removal in a very short time period. The decolorization efficiency was depend on the generation of the OH• radicals. The higher pH was given more pollutant removal from waste water because more OH• radical are present in that time. The order of removal rate of color and pollutant from waste water is like O3+UV+Catalyst > O3+UV > O3+Catalyst > Ozone (O3). The kinetic analysis also shown that Decolorization and TOC reduction were followed the Pseudo-First-Order reaction and also given rate constant for reaction.