حذف ترفتالیک‌اسید از پساب صنایع پتروشیمی با فرایند ازوناسیون در راکتورهای نیمه پیوسته

نوع مقاله: مقاله پژوهشی

نویسنده

باشگاه پژوهشگران جوان و نخبگان، دانشگاه آزاد اسلامی، واحد اراک، ایران

چکیده

این مطالعه با هدف ارزیابی تصفیه پساب صنایع پتروشیمی حاوی ترفتالیک اسید جهت تخلیه به محیط زیست و استفاده مجدد از آن انجام شده است. در این پروژه، از فرآیند ازوناسیون جهت تخریب و معدنی‌سازی mg/L 60 از ترفتالیک‌اسید در راکتور نیمه پیوسته تحت شرایط میزان متغیر از ازون و pH، استفاده شده است. فرآیند ازوناسیون در pHهای 5، 7 ،9 و 11 انجام شده است. میزان تخریب آلاینده بعد از گذشت min 30 از ابتدای واکنش در شرایط میزان بهینه از غلظت ازون (mg/L 6/8) و pH برابر با 9، حدود 3/99% به‌دست آمده است و در pHهای 5، 7 و11 به ترتیب حدود 70/79، 5/90 و93% از ترفتالیک اسید تخریب شده است. نتایج نشان داد که به علت تشکیل رادیکال هیدروکسیل، راندمان حذف آلاینده در محیط قلیایی نسبت به محیط اسیدی بیشتر بوده است. با افزایش غلظت آلاینده سرعت حذف آن کاهش یافت. پس از گذشت min 90 از ابتدای واکنش، میزان حذف اکسیژن مورد نیاز شیمیایی (COD) در pH برابربا 9 برابر با 5/58% بوده است. به علت تولید ترکیبات حد واسط کربوکسیلیک اسیدی سرعت تخریب ترفتالیک اسید بسیار سریع تر از سرعت معدنی سازی و حذف COD بود. سرعت تخریب آلاینده از نوع شبه درجه اول بود و ثابت سرعت(k) و زمان نیمه عمر واکنش تخریب (t1/2) تعیین شد.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Degradation of Terphetalic Acid from Petrochemical Wastewater in Semi Batch Reactors by Ozonation

نویسنده [English]

  • Aref Shokri
Young Researchers and Elite Club, Arak Branch, Islamic Azad University, Arak, Iran.
چکیده [English]

This study was performed to assess the petrochemical wastewater containing Terphthalic acid for discharge to the environment and reuse it. In this project, the ozonation process was used for the degradation and mineralization of the wastewater containing 60 mg 1-1 of Terphthalic acid in semi-continuous reactor under the variable amounts of ozone and pH. The ozonation process is performed at pH of 5 ,7 ,9 and 11. After 30 min of the treatment process, at pH of 9 and the optimal level of ozone concentration (8.6 mg/L) the degradation of the pollutant was about 99.3 % and at a pH of 5,7 and 11, the amount of degradation was 79.7 ,90.5 and 93 %, respectively. Results showed that the formation of hydroxyl radical was more at alkaline than acidic media. The removal rate decreased significantly by increasing the concentration of the Terephthalic acid. About, 58.5 % of chemical oxygen demand (COD) is removed at pH of 9 and 90 min of reaction. The removal rate of Terphetalic acid was more than the removal of COD, because the produced intermediate compounds were resistant against degradation. The degradation rate of  pollutants was pseudo first order, and the rate constant (k) and the half-life time of reaction (t2/1) were determined.
 

کلیدواژه‌ها [English]

  • Terphetalic AcidAcid
  • Ozonation
  • Semi Batch Reactors
  • Chemical Oxygen Demand
  • Petrochemical Industries Wastewater

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