کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
625525 | 1455429 | 2010 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of natural scale deposits formed in southern Algeria groundwater. Effect of its major ions on calcium carbonate precipitation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The structure and morphology of natural scale deposits formed in Ouargla's pipelines, southern Algeria, were characterized by using ICP-AES, X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy and energy dispersive spectroscopy (SEM/EDS). The precipitate is mainly composed of CaCO3 with the prevalence of the aragonite phase. Groundwater of this region was also analyzed. The principal ions identified are Ca2+, Mg2+, Na+, K+, Clâ and SO42â. The influence of these species on scaling was studied by chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) to monitor the CaCO3 precipitation on gold electrodes in calcocarbonically pure water (CCP). The structure and morphology of electrochemically synthesized scale deposits were analyzed by the same techniques used for the natural one. The effect of different cations and the cross effect of Mg2+ and SO42â were highlighted. At 10â1 mol Lâ1 SO42â inhibits strongly the scale deposition independently of the counter ion nature. At 10â2 mol Lâ1 SO42â inhibits also totally the scale deposition but only in the presence of Mg2+. At the same concentration but associated to Na+ or K+ counter ions, SO42â does not prevent scaling. These results emphasize the cross inhibition effect of Mg2+ and SO42â and are significant in regard to Algerian groundwater composition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 262, Issues 1â3, 15 November 2010, Pages 21-30
Journal: Desalination - Volume 262, Issues 1â3, 15 November 2010, Pages 21-30
نویسندگان
Rachid Ketrane, Lydia Leleyter, Fabienne Baraud, Marc Jeannin, Otavio Gil, Boualem Saidani,