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Article
The Study of Typical Conditions to Remove Co from Water by Adsorption by Using Activated Carbon

Author: Shaymaa H. Khazaal
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 9 Pages: 1691-1700
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The effective removal of heavy metal ions from water is among the mostimportant issues for many industrialized countries. The present work has beencarried out to study the adsorption of cobalt [II] ion using activated carbon.The removal of cobalt ions was investigated in batch conditions. The influence ofinitial cobalt ion concentration, pH, adsorbent dose, adsorbent practical size;contact time and shaking rate were studied at room temperature. The analysis ofresidual Co [II] ions was determined using Atomic Absorption SpectrophotometerGBC 933 plus. The results showed that the percentage adsorption of activatedcarbon increases with time and that maximum adsorption was obtained within thefirst 60 minutes of the process, and 300 rpm shaking rate.The experiments showed that the maximum % adsorption of 100% was obtainedat adsorbent dose=0.4 gm, pH=13, particle size= (0-75) μm and 10 mg/L of initialconcentration of cobalt. These results indicate that activated carbon has potentialfor removing cobalt ions from water.


Article
Fluoride Removal from Aqueous Solutions By Adsorption with Coal Ash
ازالة الفلور من المحاليل المائبة بالأمتزاز باستخدام رماد الفحم

Authors: Neran K. Ibrahim --- Shaymaa H. Khazaal
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2010 Volume: 28 Issue: 18 Pages: 5771-5781
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Dynamic adsorption studies were performed to study the suitability of coal ash to remediate fluoride-contaminated water. A series of experiments were conducted with aqueous solutions containing 2.5, 5, 10, 50 and100 mgF-/ℓ at 29 oC in a column packed with 500g of coal ash. The flow rate through the bed was 2 mℓ/hr. The effects of contact time, initial adsorbate concentration and sorbent particle size range on fluoride removal efficiency were studied. Better removal efficiencies were obtained with lower particle size ranges. The F- concentration inthe effluent gradually decreased reaching 0 mg/ ℓ after 96-168 hours depending on the initial adsorbate concentration. The kinetic results showed that defluorination follows first order kinetics. An empirical formula was proposed to describe the relationship between the fluoride removal efficiency and the dependent operating variables with 95% confidence level.

يهدف البحث الى دراسة جدوى استخدام رماد الفحم لمعالجة الماء الملوث بايونات 10 ,5 , الفلور. اجريت مجموعة من التجارب باستخدام محاليل مائية للفلور وبالتراكيز ( 2.5 لتر ) وبدرجة حرارة 20 درجة مئوية في عمود يحتوي على 500 غم /F - 50 و 100 ملغم , من رماد الفحم. معدل التدفق خلال العمود 2مللتر/ ساعة,تم دراسة تأثير معدل حجم دقائق المادة الممتزة, زمن التماس والتركيز الأبتدائي للفلور على كفاءة عملية الفصل. تم الحصول على نتائج أفضل للكفاءة باستخدام أحجام أصغر للدقائق الممتزة. تراكيز الفلور في المحاليل 168 ساعة اعتمادا على التراكيز - الناتجة من العملية كانت تقل تدريجيا وبلغت صفر بعد 96 الابتدائية للفلور في محلوله المائي . حركيات عملية أمتزاز الفلور على رماد الفحم يتبع حركيات التفاعل من الدرجة الاولى. تم اقتراح علاقة رياضية تمثل العلاقة بين كفاءة عملية فصل الفلور.% والمتغيرات المعتمدة للعملية وبدرجة ثقة 95

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