1دانشجوی دکترای مهندسی عمران، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران
2دانشیار گروه مهندسی محیط زیست، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران
3استاد گروه مهندسی محیط زیست، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران
4دانشیار گروه سرامیک، بخش مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه تربیت مدرس، تهران
تاریخ دریافت: 09 تیر 1392،
تاریخ بازنگری: 04 اسفند 1392،
تاریخ پذیرش: 11 اسفند 1392
چکیده
در این پژوهش از فرایند ازن‌زنی در راکتور ناپیوسته برای تصفیه فاضلاب حاوی اسید اورانژ 7 استفاده شد. متغیرهای مستقل شامل غلظت رنگزا در محدوده 5 تا 250 میلی‌گرم در لیتر، pH در محدوده 4 تا 12، دبی جرمی ازن با مقادیر 12 و 20 میلی‌گرم در دقیقه و دبی حجمی ازن به‌میزان 5/0 و 1 لیتر بر دقیقه بودند. طبق نتایج، در شرایط بهینه شامل غلظت 100 میلی‌گرم در لیتر رنگزا، pH برابر 11، دبی جرمی ازن 20 میلی‌گرم بر دقیقه و دبی حجمی1 لیتر بر دقیقه پس از 150 دقیقه، میزان حذف رنگزا 100 درصد و میزان حذف COD 30 درصد به‌دست آمد. بر اساس منحنی جذبی، جذب نور فاضلاب با ازن‌زنی در شرایط بهینه پس از حذف رنگزا، در بازه 450 تا500 نانومتر، 100 درصد افزایش یافت. طبق نتایج آزمایش GC-Mass و مقادیر LD50، اسید اورانژ 7 به ترکیبات سمی‌تر 1 و 4- نفتالین‌دی‌ال، 1- نفتیل‌آمین، 2- نفتل و آنیلین تبدیل شد، که برای از بین بردن آنها باید فرایند ازن‌زنی تا حذف کامل COD ادامه یابد. سطوح بهینه پارامترهای مؤثر بر تصفیه فاضلاب واقعی نساجی با روش تاگوچی برای متغیرهای pH، میزان ازن تزریقیو دبی تزریق ازن به‌ترتیب 11، 20 میلی‌گرم در دقیقه و 1 لیتر بر دقیقه به‌دست آمد.
1PhD Student of Environmental Engineering, Dept. of Civil and Environmental Engineering, Tarbiat Modarres University, Tehran
2Assoc. Prof. of Environmental Engineering, Dept. of Civil and Environmental Engineering, Tarbiat Modarres University, Tehran
3Prof. of Environmental Engineering, Dept. of Civil and Environmental Engineering, Tarbiat Modarres University, Tehran
4Assoc. Prof. of Ceramics, Dept. of Materials Engineering, Faculty of Engineering, Tarbiat Modarres University, Tehran
چکیده [English]
In this research, ozonation was used for treating wastewater containing acid orange 7 in a batch reactor. The independent parameters were initial dye concentration, pH, and ozone mass and volumetric flow rates. The experiments were conducted with initial concentration in the range of 5-250 mg/L, pH levels of 4-12, ozone mass flow rates of 12 and 20 mg/min, and volumetric flow rates of 0.5 and 1 L/min. Based on the results, the optimum conditions were achieved at a dye concentration of 100 mg/L, a pH level of 11, an ozone mass flow rate of 20 mg/min, and an ozone volumetric flow rate of 1 L/min. Dye and COD removal efficiencies in these conditions were 100% and 30%, respectively, after 150 minutes. According to the absorbance curves, light absorbance of wastewater increased by 100% in the range of 450-500 nm by ozonation under the optimum conditions after dye removal. Based on the GC-Mass test and the values of LD50, acid orange 7 was converted to toxic compounds of aniline, 1-naphthylamine, 2-naphthol, and 1, 4-naphthalenediol indicating that ozonation had to be continued until complete COD removal. Based on the Taguchi experimental design data for real textile wastewater, the optimum conditions were obtained for a pH level of 11, a gas flow rate of 1 L/min, and an ozonation injection rate of 20 mg/min.
کلیدواژه‌ها [English]
Azo, COD, Light Absorbance, pH, concentration
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