مقایسه فرایندهای انعقاد الکتریکی و فتواکسیداسیون UV/ O3 در حذف رنگزای اسید آبی 113

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

2 دانشجوی دکترای مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

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

چکیده

روزانه میلیون‌ها لیتر پساب رنگی توسط صنایع مختلف تولید می‌شود که این پسابها باعث بروز مسائل محیط زیستی می‌شوند. هدف از این تحقیق، بررسی و مقایسه قابلیت حذف رنگزای اسید آبی 113 یکی از پرمصرف‌ترین رنگزاهای نساجی، با استفاده از دو فرایند انعقاد الکتریکی و فتواکسیداسیون UV/O3 در شرایط ناپیوسته بود. در روش انعقاد الکتریکی، آزمایش‌ها با استفاده از الکترودهای آهن صورت گرفت و تأثیر دانسیته جریان، زمان الکترولیز، pH و غلظت رنگزا و الکترولیت مورد بررسی قرار گرفت. در روش فتواکسیداسیون UV/O3تأثیر مقدار ازن، توان تابش، زمان، pH و غلظت رنگزا تعیین و بهینه‌سازی شد. آزمایش‌ها در شرایط بهینه در روش انعقاد الکتریکی نشان داد که با اعمال دانسیته جریان 44 آمپر بر متر مربع در pH معادل 5/6 و غلظت الکترولیت 3 گرم در لیتر، بیش از 90 درصد از رنگزای پساب با غلظت 100 میلی‌گرم در لیتر پس از 5 دقیقه کاسته می‌شود درحالی‌که در روش فتواکسیداسیون UV/O3در  pHبرابر 9، توسط 4 گرم بر ساعت ازن و توان مؤثر تابشmW/cm2 15 پس از 15 دقیقه تنها 70 درصد رنگزا با غلظت ppm 15 حذف می‌گردد. طبق نتایج حاصل، روش انعقاد الکتریکی قابلیت بهتری نسبت به‌روش فتواکسیداسیون UV/O3 دارد. اگر چه این روش با تجهیزات ساده راه‌اندازی شده و تا حدی اقتصادی است ولی مشکل تولید لجن را به‌دنبال دارد. لذا با توجه به وضعیت صنعت باید روش مناسب را انتخاب نمود.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison of Electro-Coagulation and Photo-Oxidation UV/O3 Processes in Removal of Acid Blue 113

نویسندگان [English]

  • Bita Ayati 1
  • Parisa Hassanzadeh 2
  • Roya Nayebi Gavgani 3
1 Assoc. Prof. of Civil and Env. Eng., Tarbiat Modares University, Tehran
2 Ph.D. Student of Civil and Env. Eng., Tarbiat Modares University, Tehran
3 M.Sc. Student of Civil and Env. Eng., Tarbiat Modares University, Tehran
چکیده [English]

Every day million liters of dye wastewater is produced in different industries that cause environmental problems. The purpose of this research was to investigate the possibility of Acid Blue 113 removal, which is one of the most consumed textile dyes, by using electro-coagulation and photo-oxidation UV/O3 processes in batch condition. Iron electrodes were used and the effect of current density, electrolysis time, pH, initial dye and electrolyte concentrations on dye removal were evaluated. Regarding photo-oxidation UV/O3 process, parameters including ozone dosage, light power, time, pH and dye concentration were determined and optimized. The results in the optimum conditions showed that in the electro-coagulation method, over 90 percent of 100 mg/L dye was removed after 5 minutes in the applied current density of 44 mA/m2, pH of 6.5 and electrolyte concentration of 3 g/L. However, in the photo-oxidation UV/O3 process, only 70 percent of 15 mg/L dye was removed after 15 minutes in pH of 9, 4 g/h of ozone and 15 mW/cm2 of power. According to the results, electro-coagulation method had better capability in comparison to photo-oxidation UV/O3 process. Although, the first method was operated with simple equipments and was more economical but had still sludge producing remained. Therefore, according to the type of industry, the proper method should be selected.

کلیدواژه‌ها [English]

  • Acid Blue 113
  • Electro-Coagulation
  • Photo-Oxidation UV/O3
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