حذف فنل و رنگ از لیکور سیاه فرایند خمیر کاغذ سازی به‌روش الکتروکواگولاسیون

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد صنایع چوب و کاغذ، دانشگاه تربیت مدرس، تهران

2 استادیار گروه علوم وصنایع چوب و کاغذ، دانشگاه تربیت مدرس، تهران

3 استادیار گروه شیمی، دانشگاه پیام نور، مرکز ساری

چکیده

در کشور ایران منابع لیگنوسلولزی غیر چوبی زیادی از قبیل کاه گندم، کاه برنج و دیگر محصولات زراعی با قابلیت مناسب برای تولید خمیر کاغذ وجود دارد. اصلی‌ترین عامل بازدارنده استفاده از آنها، وجود لیکور سیاه حاصل از فرایند خمیرسازی است که به‌دلیل انحلال لیگنین از ماده لیگنوسلولزی، حاوی مقادیر فراوانی رنگ و ترکیبات فنلی است. هدف از این مطالعه، بررسی قابلیت حذف فنل و رنگ به‌عنوان مهم‌ترین آلاینده آلی لیکور سیاه حاصل از فرایند خمیرسازی کاه گندم به‌روش الکتروکواگولاسیون بود. در این مطالعه از الکترودهای آلومینیوم با اعمال پتانسیل 16 ولت و شدت جریان 1700 میلی‌آمپر استفاده شد. تأثیر زمان‌های مختلف الکترولیز (10، 25، 40، 55 و 70 دقیقه) و pH (3، 5، 7، 9 و 5/10) بر روی لیکور سیاه مورد بررسی قرار گرفت. نتایج نشان داد که بیشترین میزان حذف در pH اولیه 5 حاصل شد که منجر به کاهش 78 درصد فنل کل و 98 درصد رنگ لیکور سیاه در مدت زمان 70 دقیقه گردید. روش الکتروکواگولاسیون به‌دلیل ساده و مؤثر بودن و هزینه سرمایه‌گذاری پایین آن در مقایسه با دیگر تکنولوژی‌‌های تصفیه لیکور سیاه می‌تواند مورد استفاده قرار گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Elimination of Phenol and Color from Pulping Black Liquor Using Electrocoagulation Process

نویسندگان [English]

  • Nahid Rastegarfar 1
  • Rabi Behrouz 2
  • Nader Bahramifar 3
چکیده [English]

There are many non-wood lignocelluloses resources such as wheat, rice straw and other agriculture by- products with appropriate feature for pulp production in Iran. The most major deterrent to their use is presence of pulping black liquor that due to lignin of lignocelluloses solution contains significant amounts of color and phenol compounds. The aim of this paper was investigation of the ability to remove phenol and color as the most important organic pollutants from back liquor of agri-based pulping process using electrocoagulation method. In the electrocoagulation process aluminium electrode was used and cell potential and current intensity were adjusted on 16 V and 1700 mA respectively. The effect of various treatment time (10, 25, 40, 55, 70 min) and initial pH (3, 5, 7, 9, 10/5) of black liquor were investigated.The results showed that maximum of decrease obtained at pH 5 that has led to a remove capacity 78% of phenol and 98% of color in treatment time 70 min. electrocoagulation method can be used for black liquor treatment because of simple, effective and its low investment cost compared to other technologies.

کلیدواژه‌ها [English]

  • Black Liquor
  • Electrocoagulation
  • Aluminum Electrode
  • Phenol
  • Color
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