کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
585013 | 1453186 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrodialytic extraction of Cd and Cu from sediment from Sisimiut Harbour, Greenland
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A previous study showed that the sediment of Sisimiut Harbour, Greenland is polluted with Cu and Cd to an extent where toxicological effects must be expected. This study was aimed at evaluating the possibility for removing Cu and Cd from this sediment by an electrodialytic method and also to evaluate the removal rate of the two heavy metals. The sediment was suspended in distilled water during application of current. Both heavy metals were removed successfully. The Cu concentration was reduced from 97 to 16Â mg/kg and the Cd concentration was reduced from 0.55 to 0.03Â mg/kg after 28 days with an applied current density of 1.2Â mAÂ cmâ2. However, it was seen that the removal rate decreased considerably after 3 days with an applied current density of 0.5Â mAÂ cmâ2 and the major part of the two heavy metals was removed during the first 3 days (the Cu concentration was reduced with 74% and the Cd concentration with 80%). Thus a large reduction in concentrations can be obtained relatively fast. During the process of electrodialytic treatment the sediment suspension is acidified and reaches pH 2 after about 3 days (with 0.5Â mAÂ cmâ2), where it stabilizes. A comparison with chemical extraction in HNO3 at about the same pH showed that 50-70% more Cu and 11% more Cd was removed during the electrodialytic treatment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 140, Issues 1â2, 9 February 2007, Pages 271-279
Journal: Journal of Hazardous Materials - Volume 140, Issues 1â2, 9 February 2007, Pages 271-279
نویسندگان
Lisbeth M. Ottosen, Gunvor M. Nystrøm, Pernille E. Jensen, Arne Villumsen,