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Article
Adsorption of Methyl Green Dye onto Bamboo in Batch and Continuous System

Author: Ahmed Adnan Atshan احمد عدنان
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2014 Volume: 15 Issue: 1 Pages: 65-72
Publisher: Baghdad University جامعة بغداد

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Abstract

Adsorption techniques are widely used to remove certain classes of pollutants from waters, especially those that are not easily biodegradable. Dyes represent one of the problematic groups. The removal of methyl green from waste water using bamboo was studied in batch and continuous system. In batch system equilibrium time and adsorption isotherm was studied at different concentrations (5, 10, 15, 20, 25 and 30 ppm) and 50 mg weight of adsorbent. Langmuir and Freundlich equations were applied for adsorption isotherm data. Langmiur equation was fitted better than Freundlich equation (R2=0.984 for Langmuir equation).The maximum percentage dye removal obtained 79.4% and adsorption capacity was 15.5 mg/g. For continuous system the breakthrough curve was studied at different bed depths (1, 2 and 4 cm), different concentrations (5 and 10 ppm), and different flow rates (5 and 10 ml/min).


Article
Batch and Fixed-Bed Modeling of Adsorption Reactive Remazol Yellow Dye onto Granular Activated Carbon
النمذجة الرياضية لامتزاز الصبغة الصفراء الفعالة باستخدام الفحم المنشط في تجارب الوجبة و تجارب الحشوة الثابتة

Authors: DhaferFaza Ali ظافر فزع علي --- Waleed Mohammed Abood وليد محمد عبود --- Mohammed Sadeq Salman محمد صادق سلمان
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2014 Volume: 20 Issue: 8 Pages: 156-176
Publisher: Baghdad University جامعة بغداد

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Abstract

In this work, the adsorption of reactive yellow dye (Remazol yellow FG dye) by granular activated carbon (GAC) was investigated using batch and continuous process. The batch process involved determination the equilibrium isotherm curve either favorable or unfavorable by estimation relation between adsorption capacity and concentration of dye at different dosage of activated carbon. The results were fitted with equilibrium isotherm models Langmuir and Freundlich models with R2value (>0.97). Batch Kinetic study showed good fitting with pseudo second order model with R2 (0.987) at contact time 5 h. which provesthat the adsorption is chemisorptions nature. Continuous study was done by fixed bed column where breakthrough time was increased at flow rates (21.67, 12.5 and 6 ml/min) and initial dye concentration (80, 40, 20 and 10 mg/l) were decreased and bed depth was increased (5, 10, 15 and 20 cm). The adsorption data were fitted to the fixed-bed adsorption mathematical models Thomas and Yoon-Nelson models. The results fitted well to the Thomas and Yoon-Nelson models with correlation coefficient, R2≥ 0.944. Average relative error ARE% was applied to examine the theoretical and experimental results.

في هذا البحث تم امتزاز الصبغة الصفراء الفعالة باستخدام الفحم المنشط الحبيبي خلال تجارب وجبية و مستمرة حيث تضمنت التجربة الوجبية عملية تحديد منحني التوازن عند ثبوت درجة الحرارة وبيان هل نوعه مفضل ام غير مفضل من خلال احتساب علاقة مابين سعة الامتزاز وتركيز الصبغة المتبقية في المحلول بعد الامتزاز بعد استخدام اوزان مختلفة من الفحم المنشط حيث وضحت النتائج مطابقة مع موديل لانكمير بقيمة مربع معامل ارتباط اكثر من 97% في حين تطابقت تجارب تغيير زمن التلامس عند ثبوت الحجم مع موديل سيدو ذا المرتبة الثانية بقيمة مربع معامل الارتباط 98.7% في اقصى زمن تلامس مقداره 5 ساعات والذي يثبت ان طبيعة الامتزاز بين الصبغة والفحم المنشط هو امتزاز كيمياوي. التجارب المستمرة من خلال استخدام حشوة ثابتة عند عدة متغيرات مثل معدل جريان محلول الصبغة من الاعلى الى الاسفل بمقدار ( 6 , 12.5 , 21.67) مل/دقيقة و عند تغيير تركيز الصبغة ( 10 , 20 , 40 ,80 ) ملغم/لتر وعند عمق حشوات ( 5 , 10 , 15 , 20) سم واحتساب منحني الانكسار ومقارنة النتائج مع موديلين ثوماس و يوون نيلسون و احتساب معدل الخطاء بين النتائج النظرية والعملية .

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