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Article
Kinetic and Isotherm Modeling of Adsorption of Dyes onto Sawdust

Author: Ibtehal K. Shakir ابتهال كريم شاكر
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2010 Volume: 11 Issue: 2 Pages: 15-27
Publisher: Baghdad University جامعة بغداد

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Abstract

Sawdust has the ability to adsorb the dyestuff from aqueous solution. It may be useful low cost adsorbent for the treatment of effluents, discharged from textile industries. The effectiveness of sawdust has been tested for the removal of color from the wastewater samples containing two dyes namely Direct Blue (DB) and Vat Yellow (VY). Effect of various parameters such as agitation time, adsorbent dose and initial concentration of each dye has been investigated in the present study. The adsorption of dyes has been tested with various adsorption isotherm models. The Langmuir isotherms model is found to be the most suitable one for the dye adsorption using sawdust and the maximum adsorption capacity is 8.706 mg/g and 6.975 mg/g for DB and VY respectively. The adsorption process is best described by second-order kinetics and the corresponding rate constants (K2) are obtained which are found to be 0.2837 g/mg.min and 0.1274 g/mg.min for DB and VY respectively at the maximum concentration.

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Article
LEAD Removal from Industrial Wastewater by Electrocoagulation process

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Abstract

This investigation was carried out to study the treatment and recycling of wastewater in the Battery industry for an effluent containing lead ion. The reuse of such effluent can only be made possible by appropriate treatment method such as electro coagulation.The electrochemical process, which uses a cell comprised aluminum electrode as anode and stainless steel electrode as cathode was applied to simulated wastewater containing lead ion in concentration 30 – 120 mg/l, at different operational conditions such as current density 0.4-1.2 mA/cm2, pH 6 -10 , and time 10 - 180 minute.The results showed that the best operating conditions for complete lead removal (100%) at maximum concentration 120 mg/l was found to be 1.2 mA/cm2 current density, in alkaline media pH = 10 , and at 120 minute.

في هذا البحث تم دراسة معالجة المياه وتدوير المياه الصناعية وبصورة خاصة في صناعة البطاريات ,التي تحتوي المياه الخارجة منها على ايونات الرصاص.ان عملية التلبيد الكهروكيمياوي تم تطبيقها على خلية متكونة من قطب انود من الالمنيوم والكاثود من الحديد المقاوم للصدأ لدراسة تأثير تغيير ظروف التشغيل على كفاءة عملية المعالجة لتراكيز مختلفة من ايون الرصاص في المياه الصناعية 30-120 مل غرام/لتر عند تغير كثافة التيار من 0.4-1.2 مل امبير/سم2, والدالة الحامضية من 6-10 ,والزمن من 10-180 دقيقة.بناءاً على نتائج الجانب العملي والتجارب المختبرية تم الحصول على ازالة تامة (100%) لايون الرصاص من المياه الملوثة بعد عملية المعالجة ولاعلى تركيز لايونه 120 مل غرام/لتر عند افضل ظروف تشغيل 1.2 مل امبير/سم2 وعند وسط قاعدي وافضل دالة قاعدية تساوي 10 وبزمن 120 دقيقة.

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