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Hassanjani, Sina | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44051 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Alemzadeh, Iran; Vosoughi, Manouchehr
  7. Abstract:
  8. Nowadays with the extension of industry and factories as well as different kinds of plants, a wide range of pollution and circumference hazardous has been entered to the people`s life. Industrial wastewater has been always a threat for health of our environment and efforts for reducing its dangerous effects are still under studies. Dairy wastewater is one of the main branches of food industrial pollutions and it has been studied in this specific project. The goal was to reduce the Chemical Oxygen Demands (COD) of dairy wastewater with oxidation of Titanium Dioxide Nanophotocatalyst oxidation under UV irradiation. Among the various methods for synthesizing of this Nanophotocatalyst, the Hydrothermal method was used because of low cost and not having hazardous effects on environment. A stainless still autoclave with internal Teflon lined was designed and built for hydrothermal operation. Furthermore another reactor was prepared in order to remove the COD of wastewater in presence of UV. Four parameters were considered as internal variables including Hydrothermal Time, Hydrothermal Pressure, Initial COD and Catalyst Concentration. 30 runs were designed by Design Expert (Version 7.0) software. Finally with the results of this runs, graphs comparisons and other software outputs it was demonstrated that three parameters out of four including Hydrothermal Time, Hydrothermal Pressure and Initial Catalyst Concentration have approximately linear effects on COD removal. This can be explained as by increasing the first two mentioned parameters and reducing of the third, the percentage of COD removal will increase almost linearly. But Catalyst Concentration showed a parabolic relation with COD difference. Before the maximum point, the increase of Catalysts Concentration caused the increase of COD removal, but after the maximum point, the increase of this parameter caused reducing of COD removal. At last, the optimization point for this experiment was given by the software and it was predicted that within 12 hours of time, 20 bar of pressure, the synthesized Nanophotocatalysts with dissolved concentration of 835 ppm in a wastewater with 100 ppm of initial COD, are able to cause approximately 80 percent of COD removal under UV exposing in 3.5 hours. With repetition of the experiment in predicted optimization point, it was observed that COD removal was done again with approximately 4 percent of error in comparative with theoretical prediction and this was a confirmation of this method
  9. Keywords:
  10. Hydrothermal Synthesis ; Photocatalytic Degradation ; Chemical Oxygen Demand (COD)Removal Ratio ; Dairy Wastewater ; Parameters Optimization ; Nanophotocatalyst

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