مدل‌سازی فرآیندی و بررسی سینتیکی تصفیه پساب پالایشگاه نفت در یک راکتور فتوکاتالیستی با استفاده از نانو ذرات

نوع مقاله : مقاله پژوهشی

نویسندگان

1 جهاد دانشگاهی، واحد استان کرمانشاه

2 شرکت پالایش نفت، استان کرمانشاه

3 دانشکده بهداشت، مرکز تحقیقات اپیدومیولوژی، کرمانشاه

چکیده

در این پژوهش اکسیداسیون فتوکاتالیستی و معدنی‌سازی پساب پالایشگاه نفت در یک سوسپانسیون آبی از دی اکسید تیتانیوم (20% روتایل، 80 % آناتاز) در یک راکتور ناپیوسته مورد مطالعه قرار گرفت. آزمایشات بر اساس طراحی ترکیبی مرکزی (CCD) طراحی گردید و با استفاده از متدولوژی پاسخ سطح، آنالیز و بررسی شد. به منظور بررسی فرآیند چهار متغیر فرآیندی که نقش اساسی در فرآیند فتوکاتالیستی دارند، انتخاب شدند این چهار متغیر عبارتند از: pH محیط (2-10)، غلظت کاتالیست (mg/l 200-0)، دما (22/5-C° 57/5) و زمان واکنش (30-150min) و حذف اکسیژن مورد نیاز شیمیایی کل (TCOD) به عنوان پاسخ فرآیندی انتخاب گردید. بر اساس نتایج ANOV، اثرات درجه اول کلیه متغیرها (pH، دما، غلظت کاتالیست و زمان) و اثرات درجه دوم pH، غلظت کاتالیست و دما بیشترین تأثیر را بر روی فرآیند حذف COD کل داشتند. بیشترین مقدار حذف COD با راندمان حذف 83% در شرایط 6=pH، غلظت کاتالیست mg/l 100، دما C° 45 و زمان واکنش 120 دقیقه به‌دست آمد. همچنین نتایج سینتیکی به‌دست آمده نشان داد که انرژی فعال‌سازی برای تبدیل TCOD مقدار kg/mol 34-19 می‌باشد.
 

کلیدواژه‌ها

عنوان مقاله [English]

Process Modeling and Kinetic Evaluation of Petroleum Refinery Wastewater Treatment in a Photocatalytic Reactor Using TiO2 Nanoparticles

نویسندگان [English]

  • Fatemeh Shahrezaei 1
  • Azita Shafei 2
  • Amirmohammad Mansouri 3
1 Academic Center for Education, Culture & Research (ACECR), Kermanshah
2 Oil Refinery Co., Kermanshah
3 Department of Analytical Chemistry, Faculty of Chemistry, Razi University, Kermanshah
چکیده [English]

The photocatalytic oxidation and mineralization of petroleum refinery wastewater in aqueous catalyst suspensions of titanium dioxide (TiO2), Degussa P25 (80% anatase, 20% rutile) was carried out in a batch circulating photocatalytic reactor. The experiments were conducted based on a central composite design (CCD) and analyzed using response surface methodology (RSM). In order to analyze the process, four significant variables viz. pH (2-10), catalyst concentration (0-200 mg/l), temperature (22.5-52.5 °C), and reaction time (30-150 min) and TCOD removal as the process response were studied. From the data derived from the factorial design, the ANOVA analysis revealed that the first order effects of reaction time, pH, temperature, and catalyst concentration and second order effect of pH, catalyst concentration, and temperature produced the main effect on TCOD removal efficiency. A maximum reduction in TCOD of more than 83% was achieved at the optimum conditions (pH of 4, catalyst concentration of 100 mg/l, temperature of 45 °C, and reaction time of 120 min). The reaction kinetics showed that reactive activation energy for TCOD conversion was calculated to be 19.34 kJ/mol.
 

کلیدواژه‌ها [English]

  • Petroleum Refinery Wastewater
  • Photocatalytic Degradation
  • TiO2 Nanoparticles
  • Kinetics
  • RSM

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