مجله آب و فاضلاب

مجله آب و فاضلاب

حذف رنگ از آب حاوی رنگ‌زای آزو Ponceau 4R با استفاده از فرایند هیبریدی ازن-الکتروفنتون: مطالعه تأثیر پارامترهای عملیاتی و سینتیک فرایند

مقالات آماده انتشار

نوع مقاله : مقاله پژوهشی

نویسندگان
میرمحمد عظیمی خطیبانی 1
مریم حسنی زنوزی 2
سروش دیانی نجف آبادی 1
1 کارشناسی ارشد، گروه آب و محیط‌زیست، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران
2 استادیار، گروه آب و محیط‌زیست، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران
10.22093/wwj.2026.588230.3560
چکیده
هدف از انجام این پژوهش، بررسی حذف رنگ از آب حاوی رنگ‌زای آزو Ponceau 4R با استفاده از فرایند هیبریدی ازن- الکتروفنتون و مقایسه آن با هریک از فرایندهای ازن‌زنی و الکتروفنتون به‌تنهایی بود. آزمایش‌ها به‌صورت ناپیوسته و بر اساس روش OFAT انجام شد. تأثیر پارامترهای عملیاتی شامل غلظت الکترولیت سدیم سولفات (Na2SO4) (25/0، 5/2 و mM 25)،pH اولیه (3، 7 و 5/8)، غلظت یون فروس (Fe2+) (1/0، 1 و mM 10)، چگالی جریان اعمالی (05/1، 25/6 و mA/cm26/14) و نرخ تزریق ازن (2/0، 1 و g/h 2) بر بازدهی فرایند ارزیابی شد. در همه آزمایش‌ها، غلظت اولیه رنگ‌زا برابر با 200 و مدت‌زمان واکنش تا 90 دقیقه در نظر گرفته شد. تحت مقدار بهینه پارامترهای عملیاتی (غلظت الکترولیت: mM5/2، pH معادل 3، غلظت یون فروس: m 1، چگالی جریان: mA/cm2 25/6، نرخ تزریق ازن: g/h 2)، بازدهی حذف رنگ در سیستم هیبریدی ازن- الکتروفنتون تنها پس از گذشت 60 دقیقه از زمان واکنش به حدود 100 درصد رسید. در مقایسه، هریک از فرایندهای ازن‌زنی و الکتروفنتون، پس از 90 دقیقه واکنش تحت شرایط بهینه خود، نتوانستند به ترتیب بیش از 89 و 51 درصد حذف رنگ داشته باشند. همچنین نتایج نشان داد که افزایش زمان واکنش تا 90 دقیقه، نامطلوب بودن مقدار همه پارامترهای عملیاتی موردسنجش به‌جز نرخ تزریق ازن را جبران می‌کند. این نتیجه، نقش کلیدی ازن را در تولید رادیکال آزاد هیدروکسیل ( ) در فرایند هیبریدی ازن- الکتروفنتون آشکار ساخت. بررسی مدل‌های سینتیکی نشان داد که سینتیک مرتبه اول با ضریب هم‌بستگی (R2) 994/0، در مقایسه با سینتیک‌ مرتبه دوم با ضریب هم‌بستگی 575/0، از قابلیت بسیار بهتری در تخمین بازدهی فرایند هیبریدی ازن- الکتروفنتون در حذف رنگ، آب حاوی رنگ‌زای P4R دارد. به‌طورکلی، سیستم هیبریدی ازن- الکتروفنتون عملکرد بسیار بهتری نسبت به هر یک از دو فرایند ازن‌زنی و الکتروفنتون نشان داد و با ایجاد هم‌افزایی بین دو فرایند، موجب افزایش سرعت واکنش و دستیابی به رنگ‌زدایی کامل در مدت‌زمان کوتاه شد. ازاین‌رو، می‌توان این فرایند هیبریدی را به‌عنوان جایگزین مناسبی برای سایر روش‌های حذف رنگ‌زا، که عموماً از سرعت کم و عدم دستیابی به حذف کامل آلاینده رنج می‌برند، در نظر گرفت. همچنین، انجام پژوهش در خصوص ابعاد فنی و اقتصادی سیستم هیبریدی ازن- الکتروفنتون، برای پیاده‌سازی فرایند در مقیاس واقعی، ارزشمند بود.
کلیدواژه‌ها
اکسیداسیون پیشرفته
فاضلاب حاوی رنگ‌زا
رنگ‌زای آزو Ponceau 4R
ازن‌زنی
الکتروفنتون
فرایند هیبریدی ازن- الکتروفنتون
موضوعات

عنوان مقاله English

Decolorization of Ponceau 4R Azo Dye-Containing Water Using Ozone–Electro-Fenton Hybrid Process: Study of the Effect of Operational Parameters and Process Kinetics

نویسندگان English

MirMohammad Azimi Khatibani 1
Maryam Hasani Zonoozi 2
Soroush Dayani Najafabadi 1
1 Master of Science, Water and Environment Group, Dept. of Civil Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
2 Assist. Prof., Water and Environment Group, Dept. of Civil Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
چکیده English

This study aims to investigate the decolorization of Ponceau 4R azo dye-containing water using ozone–Electro-Fenton hybrid process and compare it with each of the ozonation and Electro-Fenton processes alone. The experiments were conducted in a batch mode and based on the OFAT (One Factor at a Time) method. The effect of parameters including sodium sulfate (Na2SO4) electrolyte concentration (0.25, 2.5 and 25 mM), initial pH (3, 7 and 8.5), ferrous ion (Fe2+) concentration (0.1, 1 and 10 mM), applied current density (1.05, 6.25 and 14.6 mA/cm2), and ozone injection rate (0.2, 1 and 2 g/h) on decolorization efficiency was evaluated. In all experiments, the initial dye concentration was kept constant on 200 mg/L and the reaction time was considered to be up to 90 minutes. According to the obtained results, under the optimal values of the operating parameters (electrolyte concentration: 2.5 mM, pH=3, ferrous ion concentration: 1 mM, current density: 6.25 mA/cm2, ozone injection rate: 2 g/h), the decolorization efficiency in the ozone–Electro-Fenton hybrid system reached about 100% only after 60 min of reaction time. In comparison, each of the ozonation and Electro-Fenton processes, failed to achieve more than 89% and 51% efficiencies, respectively, even after 90 minutes of reaction under their optimal conditions. The results also showed that increasing the reaction time to 90 min compensated for the undesirability of all the operating parameters measured except the ozone injection rate. This result revealed the key role of ozone in the production of hydroxyl free radicals ( ) in the ozone-Electro-Fenton hybrid process. Examination of kinetic models showed that the first-order kinetics with a correlation coefficient (R2) of 0.994, compared to the second-order kinetics with a correlation coefficient of 0.575, has a much better ability to estimate the decolorization performance of the hybrid process. In general, the ozone–Electro-Fenton hybrid system showed much better performance than either ozonation or Electro-Fenton processes. The hybrid system increased the reaction speed and achieved complete decolorization in a short time by creating synergy between the two processes. Therefore, the ozone–Electro-Fenton hybrid system can be considered as a suitable alternative to other dye removal methods, which generally suffer from low speed and failure to achieve complete removal of the pollutant. Accordingly, conducting researches on the technical and economic aspects of the ozone–Electro-Fenton hybrid process is valuable for implementing the process on a real scale.

کلیدواژه‌ها English

Advanced Oxidation
Dye Containing Wastewater
Ponceau 4R Azo Dye
Ozonation
Electro-Fenton
Ozone-Electro-Fenton Hybrid Process
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مجله آب و فاضلاب

مقالات آماده انتشار، پذیرفته شده
انتشار آنلاین از 27 اردیبهشت 1405