Photocatalytic ozonation Removal from wastewater refinery with TiO۲ Nano-particles

Wastewater treatment for water reuse is one of the main concerns in oil refineries since it can lead to high economic and environmental benefits. photocatalytic ozonation is a non-selective mineralization technology of organic matter in water by using active free radicals generated by ozone degradation. The COD removal was investigated by various advanced oxidation processes including UV, UV/TiO۲, O۳, O۳/TiO۲, O۳/UV and UV/O۳/TiO۲. The obtained results revealed that all processes obeyed pseudo-first order kinetics and the coupled UV/O۳/TiO۲ process was the most efficient method for the COD removal with high synergistic effect. The maximum COD removal efficiency during ۶۰ minutes, to the process of reconciliation ozonation/photocatalysts average, about ۸۴.۱۶% respectively. Then, the effect of major operational parameters, such as ozone and TiO۲ dosage and pH on the efficiency of the significant coupled process was studied. changes in the initial ۶۰ min of the processes taking place at the time of making, reduce slightly in pH resulting from the production of intermediates is created. Then by optimizing reaction conditions, it was found that most of the destruction in pH=۱۱ done. Catalyst study showed different levels by increasing the amount of catalyst, the more contaminants are destroyed. Changes in the ozone rate, the removal efficiency of wastewater can make a large change, also showed the greatest changes in the initial ۶۰ min of the processes taking place at the time of making, reduce slightly in pH resulting from the production of intermediates is created

کلیدواژه ها:

Nano Titanium Dioxide ، Refinery Wastewater ، Advanced Oxidation Processes ، Photo-catalysis ، Photocatalytic Ozonation