کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
234176 465391 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On the fundamentals of Cr(III) removal from liquid streams by a bacterial strain
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
On the fundamentals of Cr(III) removal from liquid streams by a bacterial strain
چکیده انگلیسی

This paper deals with the removal of Cr(III) species from liquid streams by a hydrophobic bacteria strain, Rhodococcus opacus. Zeta potential measurements, sorption and microflotation studies were carried out in order to evaluate the industrial potential application of such strain. It was observed that R. opacus exhibited an isoelectric point around pH 3.2 and the zeta potential profiles suffered a slight deviation after the contact with the sorbate. From the sorption studies, it was concluded that the highest metal removal took place at pH around 5.0 and the isotherm that best suited the sorption phenomenon was related to the Freundlich model with constants KF = 1.71 mg0.14 dm2.58 g−1 and 1/n = 0.86. Furthermore, the kinetics data indicated that biosorption is relatively slow providing 49.10% of metal removal after 200 min; moreover, the pseudo-second order model fitted best the experimental data. Lastly, three different concentrations of R. opacus were tested in a bioflotation system. With only one cycle of operation, the highest biomass concentration, 1.50 g dm−3, achieved 96.30% of metal removal after 20 min of flotation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 21, Issue 1, January 2008, Pages 48–54
نویسندگان
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