Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Investigating the Efficiency and Optimization of Refinery Wastewater Treatment with Combined Ozone and Photochemical Oxidation Methods

Document Type : Research Article

Authors
Farzaneh Ghaffari 1
Hadi Soltani 2
Mehrab Fallahi Samberan 1
1 Chemical Engineering Department, Engineering Faculty, Ahar Branch, Islamic Azad University, Ahar, I.R. IRAN
2 Department of Chemical Engineering, Faculty of Engineering, University of Maragheh, Maragheh, I.R. IRAN
Abstract
‏Refineries are water-intensive industries and produce wastewater with high organic pollution that cannot be treated in common systems. Considering the rapid growth of these industries and the adverse effects of their effluents entering the environment, the necessity of using methods with low cost and high efficiency is felt. COD removal of refinery effluents and other hazardous effluents by advanced oxidation processes has become common, especially in the last few decades; The reason for this is the complete or partial destruction of pollutants in a very short retention time and acceptable costs. In this research, COD removal of refinery effluent was investigated using the integrated ozonation/photochemical method. For this purpose, after the preliminary examination of various parameters on the work process, four main factors including the initial COD amount, input ozone, reaction time and catalyst amount were considered and The effect of the changes of these factors on the COD removal process of wastewater was investigated. CCD central composition design method was used to design the experiment. After ensuring a good match between the laboratory data and the output of the model, the work optimization was done using the RSM response procedure method. The optimal values of pH, COD, O3, and TiO2 obtained were 11, 200 mg/L, 5 g/h, and 200 mg/L, respectively. In these conditions, the maximum COD removal efficiency was obtained in 50 minutes for the combined ozonation/photochemical process, about 96.3%. Furthermore, it was observed that the change in the amount of COD as well as the change in the input ozone has a significant effect on the overall COD removal efficiency.
Keywords
Treatment
COD
Response surface method
Ozonation
Photochemical
Subjects
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