بررسی کارایی فرایند انعقاد الکتریکی در حذف رنگ از فاضلاب صنایع نساجی پلی آکریلیک

نوع مقاله: مقاله پژوهشی

چکیده

رنگها به‌دلیل ماهیتشان از آلاینده‌های ظاهری بوده و حتی در غلظتهای نسبتاً پایین شفافیت و کیفیت زیبایی شناختی آبهای سطحی را از بین می‌برند. تا کنون از فرایندهای متعددی برای حذف رنگ از پساب استفاده شده است. در سالهای اخیر از روشهای الکتروشیمیایی به‌طور موفقیت آمیزی برای تصفیه فاضلاب رنگی استفاده شده است. در این مطالعه فرایند انعقاد الکتریکی با الکترودهای آلومینیوم به‌منظور تصفیه فاضلاب نساجی با COD برابر 1400 میلی‌گرم در لیتر به‌کار گرفته شد. این مطالعه در مقیاس آزمایشگاهی انجام گردید. نمونه مورد نظر به درون راکتور الکتروشیمیایی حاوی 4 عدد الکترود آلومینیوم وارد شد. سپس به حالت تک قطبی به یک منبع جریان برق مستقیم متصل گردید و اثر 3 پارامتر عملیاتی زمان الکترولیز از 20 تا 60 دقیقه، شدت جریان الکتریکی 5/0 تا 5/2 آمپر و pH از 4 تا9 ، بر کارایی حذف رنگ و COD مورد بررسی قرار گرفت. نتایج حاصل از مطالعه نشان داد که کارایی حذف رنگ و COD با افزایش جریان الکتریکی و زمان واکنش رابطه مستقیم و با افزایش pH رابطه عکس دارد. شرایط بهینه عملیاتی در شدت جریان 5/1 آمپر، زمان واکنش 60 دقیقه و pH طبیعی فاضلاب خام حاصل شد که در آن 86 درصد از رنگ و 85 درصد از COD حذف گردید. این مطالعه نشان داد که فرایند انعقاد الکتریکی با الکترودهای آلومینیوم می‌تواند به‌عنوان یک روش مؤثر و کارآمد برای تصفیه فاضلاب نساجی پلی آکریلیک باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Electrocoagulation Process Efficiency for Color Removal from Polyacrylic Textile Industrial astewater

چکیده [English]

Dyes due to coloring nature are appearance pollutants and destroys the transparency and aesthetic quality of surface waters even at relatively low concentration. Several processes have been used for dye removal from wastewater. In recent years, electrochemical methods have been successfully employed to treat dying wastewater.In this study, the electrocoagulation method with aluminum electrodes were used for polyacrylic textile wastewater treatment. COD of wastewater was 1400mg/l. This study was conducted in laboratory scale. The sample was placed in to the electrochemical reactor contains 4 electrodes. The electrodes were connected to a DC power supply. Then the effect of the three operational parameters, electrolysis time (20-60 minutes), electrical applied current (0.5-2.5 Ampere) and pH (4-9) on color and COD removal efficiency has been investigated. The results showed that the color and COD removal efficiency is a direct relation with increasing of the reaction time and inverse relation with increase of pH. Optimum operation conditions were in applied current of 1.5 A, the retention time of 60 minutes and pH of 4. In this condition, color and COD removals were 86% and 85%, respectively. This study showed that electrocoagulation process is an effective and efficient method to treatment of polyacrylic textile wastewater.

کلیدواژه‌ها [English]

  • Color Removal
  • COD
  • Electrocoagulation
  • Polyacrylic
  • Aluminum Electrode
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