مقایسه کارایی فرایندهای اکسیداسیون پیشرفته در حذف رنگزای اسید قرمز 14 از محلول‌های آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

2 استاد، مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

3 دانشیار، مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

چکیده

در این پژوهش قابلیت سه فرایند اکسیداسیون پیشرفته UV/TiO2، UV/H2O2 و UV/O3 در حذف رنگزای اسید قرمز 14 که یکی از پر مصرف‌ترین رنگزاها در صنایع نساجی است، در محیط آبی بررسی شد. در فرایند UV/TiO2 بیش از 90 درصد رنگزا با غلظت 40 میلی‌گرم در لیتر در شرایط بهینه با pH برابر 3، در مدت زمان 30 دقیقه، توسط 4/0 گرم در لیتر دی‌اکسید تیتانیم و شدت تابش UV 30 وات حذف شد. همچنین در فرایند UV/O3 در شرایط بهینه با pH برابر ۹، زمان ماند 15 دقیقه، غلظت 250 میلی‌گرم در لیتر رنگزا و غلظت ازن ورودی 9/0 گرم بر ساعت و شدت تابش UV 30 وات، بیش از 90 درصد حذف شد. در فرایند UV/H2O2 نیز در شرایط بهینه pH برابر ۳، زمان ماند 160 دقیقه، غلظت 75 میلی‌گرم در لیتر رنگزا و 8 میلی‌مولار پراکسید هیدروژن و شدت تابش UV 90 وات، بیش از 90 درصد تصفیه شد. با توجه به نتایج حاصل، دو فرایند UV/H2O2 و UV/O3 روش‌های مؤثری در رنگبری از فاضلاب هستند؛ اما فرایند UV/O3 فرایندی پر هزینه و نیازمند تجهیزات خاص است. فرایند  UV/TiO2در حذف  CODمؤثر نیست و نانو ذرات باید توسط سانتریفوژ یا ته‌نشینی از فاضلاب جدا شوند تا مشکلات بعدی به‌وجود نیاید. درنتیجه فرایند UV/H2O2 با توجه به کاهش مؤثر رنگزا و COD در مدت زمان کوتاه و همچنین راهبری آسان، به‌عنوان فرایند مناسب‌تر در تصفیه فاضلاب صنایع نساجی توصیه می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Advanced Oxidation Processes for Removing Acid Red 14 Dye from Aqueous Solutions

نویسندگان [English]

  • Pooyan Khishbakht 1
  • Hossein Ganjidoust 2
  • Bita Ayati 3
1 MSc Student of Environmental Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
2 Prof. of EnvironmEntal Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
3 Assoc. Prof. of Environmental Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran
چکیده [English]

In this article, the degradation efficiencies of UV/TiO2, UV/H2O2, and UV/O3 processes are compared in the removal of Acid Red 14 which is the most commonly used dye in the textile industry. Results show UV/TiO2 recorded a degradation efficiency of above 90% in 30 minutes (pH=3, [Dye]=40mg/L, [TiO2]=400mg/L), UV/H2O2 degraded 75mg/L of dye (a degradation efficiency of more than 90%) in 160 minutes, and the efficiency of UV/O3 was above 95% in only 15 minutes using an ozone concentration of 0.9gr/h ([Dye]=250mg/L, pH=9). Judging on their high efficiencies, the use of these processes is recommended for the treatment of textile effluents. It may be noted, however, that the two processes of UV/H2O2 and UV/O3 are effective in both dye degradation and COD removal, but UV/O3 is costly and needs especial equipment. UV/TiO2 is not effective in COD removal and requires the post-treatment separation of nano-particles (using a centrifuge or sedimentation process). Thus, the UV/H2O2 process seems to be the easiest and most effective process in the treatment of textile effluent due to its simplicity and effective COD removal in a short time.

کلیدواژه‌ها [English]

  • AOP
  • pH
  • COD
  • Oxidant Concentration
  • Acid Red 14
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