Utilization of ozone to remove the methylene blue color from water: Kinetic study
Mohammed A. Al-Anber
The methylene blue dye (MB+) is successfully removed from water by ozone.
The sonication is applied in a trail to enhance the oxidation process by ozone.
The kinetic behaviors of MB+ degradation by ozone follow both first-order and second-order reactions.
The semi-batch ozonation process provides better removal efficiency.
The blue color methylene blue dye (MB+) has been successfully removed from the water. The removal process was carried out by using the inorganic ozone (O3) in a semi-batch reactor. The operating variables of temperature (T = 20 - 60ºC), initial concentration of MB+ (Ci = 5, 10, 40, 60, 70 mg L-1) and pressure over the reactor vessel (p = 7, 8, 9 10 PSI) effect of decolorization process. The sonication was applied in a trail to enhance the oxidation process. The kinetic behaviors of MB+ degradation by the inorganic ozone molecules was studied by using pseudo-first order and second order to detect the oxidation mechanism of decolorization. The maximum percentage of decolorization (100%) is achieved by using low temperature (T = 20ºC), low initial concentration of MB+ (Ci = 10 mg L-1), and high pressure of ozone gas (p = 8 PSI). The equilibrium time can be achieved during 20 minutes by ozonation process. The decolorization reaction follows both the second order reaction mechanism (t £ 20 minutes) and first order after the equilibrium (t > 20 min). The semi-batch ozonation process provides better removal efficiency, high reaction rate and suitable to be used in the industry to remove methylene blue dye from industrial wastewater.