Refinery wastewater degradation with titanium dioxide,zinc oxide,and hydrogen peroxide in a photocatalytic reactor |
| |
Institution: | 1. Department of Chemical Engineering, Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana 010000, Kazakhstan;2. Chemical Technologists, REW Consultants, 2 H-3/2 Nazimabad, Karachi, Pakistan;1. University of Freiburg, FMF, Stefan Meier Str. 21, 79104 Freiburg, Germany;2. University of Freiburg, IMTEK,Georges-Koehler-Allee 103, 79110 Freiburg, Germany;3. Siemens AG, Corporate Research & Technology, Otto-Hahn-Ring 6, 81739 Munich, Germany;1. University of Newcastle, UK;2. University of Warwick, UK;1. VSB – TU Ostrava, Faculty of Safety Engineering, Lumirova 13, 700 30 Ostrava, Vyskovice, Czech Republic;2. University of Sheffield, Department of Chemical and Biological Engineering, Mappin Street, Sheffield S1 3JD, United Kingdom;1. Laboratoire de Chimie des Eaux, Faculté des Sciences, Université de Lomé, BP: 1515, Lomé-Togo;2. Institut de Chimie des Milieux et Matériaux de Poitiers, Université de Poitiers – CNRS, UMR 7285, TSA 41105, 86073 Poitiers, France |
| |
Abstract: | This paper presents the photo-catalytic degradation of real refinery wastewater from National Refinery Limited (NRL) in Karachi, Pakistan, using TiO2, ZnO, and H2O2. The pretreatment of the refinery effluent was carried out on site and pretreated samples were tested at 32–37 °C in a stirrer bath reactor by using ultra-violet photo oxidation process. The degradation of wastewater was measured as a change in initial chemical oxygen demand (COD) and with time. Optimal conditions were obtained for catalyst type, and pH. The titanium dioxide proved to be very effective catalysts in photo-catalytic degradation of real refinery wastewater. The maximum degradation achieved was 40.68% by using TiO2 at 37 °C and pH of 4, within 120 min of irradiations. When TiO2 was combined with H2O2 the degradation decreased to 25.35%. A higher reaction rate was found for titanium dioxide. The results indicate that for real refinery wastewater, TiO2 is comparatively more effective than ZnO and H2O2. The experiments indicated that first-order kinetics can successfully describe the photo-catalytic reaction. The ANOVA results for the model showed satisfactory and reasonable adjustment of the second-order regression model with the experimental data. The ANOVA results also showed that pH is significant than reaction time and catalyst dosage of TiO2; and in case of ZnO, reaction time is significant than pH and catalyst dosage. This study proves that real refinery wastewater reacts differently than synthetic refinery wastewater, oil field produced water or oil water industrial effluent. |
| |
Keywords: | Photo-catalytic degradation Refinery wastewater Ultra-violet light Titanium dioxide Zinc oxide Hydrogen peroxide |
本文献已被 ScienceDirect 等数据库收录! |
|