حذف رنگ متیلن‌بلو از محیط‌های آبی به‌وسیله خاکستر فرار فعال شده نیروگاه زرند کرمان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد مرکز تحقیقات مهندسی بهداشت محیط و گروه بهداشت محیط دانشگاه علوم پزشکی کرمان

2 دانشجوی کارشناسی ارشد مهندسی بهداشت محیط، گروه بهداشت محیط، دانشگاه علوم پزشکی کرمان، کرمان، ایران

3 کارشناسی ارشد شیمی آلی، پژوهشگر مرکز تحقیقات مهندسی بهداشت محیط، دانشگاه علوم پزشکی کرمان، کرمان، ایران

چکیده

جذب سطحی از مهم‌ترین فرایندهای تصفیه فاضلاب‌های حاوی رنگ است. در این پژوهش چگونگی حذف رنگ متیلن‌بلو به‌عنوان یک رنگ شاخص، توسط جاذب خاکستر فرار فعال شده نیروگاه برق شهرستان زرند بررسی شد. خاکستر فرار نیروگاه زرند کرمان با استفاده از فرمالدئید در محیط اسیدی فعال شد و به‌عنوان جاذب، مورد استفاده قرار گرفت. عوامل مؤثر در فرایند فعال‌سازی جاذب شامل دما، زمان، مقدار فرمالدئید، مقدار و غلظت اسید و همچنین عوامل تأثیرگذار در فرایند جذب، برای شرایط بهینه تنظیم شد. آزمایش‌ها در شرایط بهینه بر روی پساب شبه واقعی کارخانه نساجی یزد بافت انجام شد. خاکستر فرار فعال شده در زمان 5 ساعت، غلظت اسید 8 درصد، نسبت فرمالدئید به خاکستر فرار برابر 25/0، نسبت 6 به 1 اسید به خاکستر فرار و دمای 100 درجه سلسیوس تهیه شد. حداکثر راندمان حذف متیلن‌بلو در نمونه سنتتیک (با غلظت 50 میلی‌گرم در لیتر) در شرایط بهینه یعنی pH برابر ۹، زمان تماس 30 دقیقه، دمای 35 درجه سلسیوس و مقدار جاذب 3 گرم در لیتر برابر 112/0±07/99 درصد، به‌دست آمد. ظرفیت جذب در این شرایط برابر 55/0±5/16 میلی‌گرم بر گرم بود. راندمان حذف متیلن‌بلو در پساب واقعی در شرایط بهینه 36/0± 8/91 درصد بود. خاکستر فرار فعال شده نیروگاه زرند به‌عنوان یک جاذب در دسترس با راندمان حذف بالا می‌تواند برای تصفیه پساب‌های رنگی مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Removal of Methylene Blue Dye from Aqueous Solutions Using Activated Fly Ash from Zarand Power Plant in Kerman

نویسندگان [English]

  • Mohamad Malakootian 1
  • Shima Rezaei 2
  • Alireza Nasiri 3
  • Najmeh Amir Mahani 3
1 1- Professor of Environmental Health Engineering Research Center and Department of Environmental Health, Kerman University of Medical Sciences
2 MSc Student, Dept. of Environmental Health, Kerman University of Medical Sciences, Kerman, Iran
3 MSc In Organic Chemistry, Researcher of Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran
چکیده [English]

Adsorption is one of the major Processes for the removal of dyes from wastewater. This study investigates the removal of methylene blue dye, as an index color, using activated fly ash. For this purpose, fly ash from Zarand Power Plant was activated with formaldehyde in an acidic medium and used as the adsorbent. The parameters involved in the fly ash activation process (including temperature, time, formaldehyde content, as well as acid concentration and content) and those affecting the adsorption process were adjusted for optimized conditions. Experiments were performed with samples of real effluent from Baft Yazd Textile Plant.   Preparation of activated fly ash was accomplished in a formaldehyde to fly ash ratio of 0.25, an acid concentration of 8%, and an acid to fly ash ratio of 6 over 5 hours. Maximum removal efficiency of methylene blue from synthetic samples (with a concentration of 50mg/L) under optimal conditions (pH: 9, contact time: 30 minutes, temperature: 35 0c, and adsorbent dose: 3g/L) was equal to 99.07 ± 0.112%. Under these same conditions, an adsorption capacity of 16.5± 0.55 mg/g was achieved. The methylene blue removal efficiency from real samples under optimal conditions was 91.8±0.36%. Based on the findings of this study, modified fly ash from Zarand Power Plant may be recommended as an inexpensive adsorbent that can be used with a high removal efficiency for removing dyes from industrial effluents.

کلیدواژه‌ها [English]

  • Fly ash
  • Methylene blue
  • Industrial Wastewater
  • Adsorption

مراجع

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مجله آب و فاضلاب

دوره 26، شماره 3
مرداد و شهریور 1394
صفحه 62-71

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