بررسی حذف متیلن بلو از محلول‌های آبی با روش انعقاد الکتریکی در راکتور با جریان پیوسته: مدل سازی و بهینه‌سازی متغیرهای عملیاتی

نویسندگان
علی جعفری
منصور قادرپوری
گروه مهندسی بهداشت محیط، دانشکده بهداشت و تغذیه، دانشگاه علوم پزشکی لرستان، خرم آباد، ایران
چکیده
مقدمه

کاربرد وسیع و روز افزون مواد رنگی بویژه رنگ‌­های سنتتیک و لزوم حذف این مواد از محلول­‌های آبی یکی از چالش­‌ها و نگرانی­‌های زیست محیطی و بهداشتی جوامع صنعتی امروزی محسوب می‌­شود. هدف از این مطالعه، بررسی استفاده از فرآیند انعقاد الکتریکی برای حذف رنگ متیلن بلو به عنوان یکی از رنگ­‌های پرکاربرد و مشکل­‌ساز از محلول‎های آبی بود.

مواد و روش‌­ها

این مطالعه در مقیاس آزمایشگاهی و در یک راکتور انعقاد الکتریکی با جریان پیوسته انجام گرفت. به منظور آنالیز بهتر از روش سطح-پاسخ با استفاده از مدل باکس-بنکن استفاده گردید. همچنین، جهت درک بهتر فرایند، تاثیر متغیرهای عملیاتی و اثر متقابل آنها بر عملکرد فرآیند، نیز بررسی شد. برای این منظور، سه پارامتر مستقل (هر یک در سه سطح) شامل دانسیته جریان (5، 7/5 و 10 میلی‎آمپر بر سانتی‎متر مربع)، غلظت رنگ (50، 100 و 150 میلی‎گرم ‎در لیتر) و زمان عملیاتی (20، 60 و 100 دقیقه) استفاده شد.

یافته­‌ها

نتایج آنالیز واریانس نشان داد حذف رنگ تحت تاثیر تمام متغیرهای مستقل و اثرات متقابل آنها قرار دارد. در شرایط بهینه و در محدوده مقدار متغیرهای انتخاب شده، دانسیته جریان (7/39 میلی‎آمپر بر سانتی‎متر مربع)، رنگ (53/21 میلی‎گرم ‎در لیتر) و زمان واکنش (86/47 دقیقه)، 99/16 درصد رنگ متیلن بلو حذف گردید.

نتیجه­‌گیری

یافته­‌ها نشان داد که در شرایط عملیاتی بهینه، فرآیند انعقاد الکتریکی می‌­تواند به طور موثری رنگ متیلن بلو را از محلول­‌های آبی حذف نماید. این روش به دلیل سادگی کاربرد و هزینه قابل تحمل آن می­‌تواند در مقیاس واقعی مطالعه و مد نظر قرار گیرد.
کلیدواژه‌ها
رنگ
متیلن بلو
انعقاد الکتریکی
روش سطح-پاسخ

عنوان مقاله English

Methylene blue removal from aqueous solutions by electrocoagulation in continuous flow reactor: Modeling and optimization of operating parameters

نویسندگان English

Ali Jafari
Mansour Ghaderpoori
Department of Environmental Health Engineering, Faculty of health and nutrition, Lorestan University of Medical Sciences, Khorramabad, Iran
چکیده English

Introduction

The application and increasingly produce of colorants, particularly, synthetic dyes, are one of the main environmental and health concerns especially in industrialized countries. If this type of dyes is discharged into the environment without any control, many problems will arise. Therefore, it is necessary to remove the dyes from aqueous solutions using appropriate methods. The purpose of this study was to investigate the use of the electrocoagulation process to remove methylene blue as one of the most widely used and problematic dyes from aqueous solution.

Methods & Materials

This study was conducted using a lab scale electrocoagulation reactor operating at a continuous flow. To better analyze and set the minimum reasonable number of experimental runs, the study was carried out using response surface methodology using the Box-Behnken model. For better understanding, the process, the effect of operating variables and their interactions on the process performance was also analyzed using the model. For this purpose, three independent parameters (at three levels) including current density (5, 7.5 and 10 mA/cm 2), dye concentration (50, 100 and 150 mg/L) and operating time (20, 60 and 100 min) were used.

Results

ANOVA test results showed that dye removal was affected by all independent variables and their interactions (P<0.05). In optimal conditions, in the range of the levels of the selected variables, the current density of 39.7 mA/cm2, dye concentration of 21.23 mg/l and reaction time of 86.47 min the removal of methylene blue obtained 99.16%.

Conclusion

This study showed that in the optimal operating conditions, the process can effectively remove the methylene blue dye. This method can be examined and considered for a real scale condition because of its simple application and affordable.

کلیدواژه‌ها English

dye
electrocoagulation
methylene blue
response surface methodology
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