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Article
Chromium (VI) Removal from Wastewater by Electrocoagulation Process Using Taguchi Method: Batch Experiments

Authors: Amenah S. Al-Nuaimi --- Kamal S. Pak
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2016 Volume: 17 Issue: 4 Pages: 95-103
Publisher: Baghdad University جامعة بغداد

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Abstract

Electrocoagulation is an electrochemical method for treatment of different types of wastewater whereby sacrificial anodes corrode to release active coagulant (usually aluminium or iron cations) into solution, while simultaneous evolution of hydrogen at the cathode allows for pollutant removal by flotation or settling. The Taguchi method was applied as an experimental design and to determine the best conditions for chromium (VI) removal from wastewater. Various parameters in a batch stirred tank by iron metal electrodes: pH, initial chromium concentration, current density, distance between electrodes and KCl concentration were investigated, and the results have been analyzed using signal-to-noise (S/N) ratio. It was found that the removal efficiency of chromium increased with increasing current density and KCl concentration, and decreases with increasing initial chromium concentration and distance between electrodes, while pH shows peak performance curve. Experimental work have been performed for synthetic solutions and real industrial effluent. The results showed that the removal efficiency of synthetic solution is higher than industrial wastewater, the maximum removal for prepared solution is 91.72 %, while it was 73.54 % for industrial wastewater for the same conditions.


Article
PERFORMANCE EVALUATION OF ELECTRO-COAGULATION SYSTEM FOR WASTEWATER TREATMENT

Authors: Sadiq S. Muhsun --- Mohammed Ibrahem. Basheer --- Mohanad M. Mahdi
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2017 Volume: 21 Issue: 5 Pages: 101-115
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

In this study, the removal of some heavy metals ions such as cadmium [Cd+2], nickel [Ni+2] and lead [Pb+2] from a synthetic wastewater were investigated using a lab scale electro-coagulation [EC] system which was constructed for this purpose. Aluminum and iron were adopted as a selective electrodes in order to compare the results for which is the best efficiency. Operational circumstances parameters such as pH, current density, detention time and inner electrodes distance were tested in order to know the optimal operation values for the removal efficiency. The results showed that the optimal operation conditions for the max removal efficiencies occur at pH (7), current density (12.5 mA/cm2), inner electrode distance (1cm) for both aluminum and iron electrodes, and the detention time is (150 min) for aluminum, and (120 min) for iron electrodes. The experimental results indicates that the aluminum electrodes is better than iron electrodes.

في هذه الدراسة, تم ازالة ايونات بعض العناصر الثقيلة كأيون الكادميوم, النيكل والرصاص من المياه المصنعة باستخدام نظام التخثر الكهربائي الذي صمم لهذا الغرض. تم استخدام الالمنيوم والحديد كأقطاب موصلة للتيار الكهربائي وعمل مقارنة بينهما لمعرفة المعدن الافضل في كفاءة الازالة. هناك عدة عوامل لها تأثير مباشر على كفاءة عمل النظام , وقد تم دراسة ألبعض منها لتحديد ظروف عمل النظام ألمثالية ومنها الرقم ألهيدروجيني, شدة التيار الكهربائي, فترة التعرض و المسافة الداخلية بين الاقطاب. النتائج ألعملية بينت بأن الظروف ألمثالية لعمل ألمنظومة هي عند الرقم ألهيدروجيني 7, شدة التيار ألكهربائي عند 12.5 ملي أمبير/سم2 , المسافة الداخلية بين الاقطاب عند 1سم, و فترة التعرض 150 دقيقة عند استخدام اقطاب الالمنيوم و 120 دقيقة عند استخدام اقطاب الحديد. النتائج العملية تشير الى ان اقطاب الالمنيوم هي الافضل لهذا النظام اكثر من اقطاب الحديد.

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