کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4721770 | 1639382 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A comprehensive study of physical and physiological parameters that affect bio-sorption of metal pollutants from aqueous solutions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: A comprehensive study of physical and physiological parameters that affect bio-sorption of metal pollutants from aqueous solutions A comprehensive study of physical and physiological parameters that affect bio-sorption of metal pollutants from aqueous solutions](/preview/png/4721770.png)
چکیده انگلیسی
An attempt was made to remove silver (I), chromium (III), and lead (II) from aqueous solutions. To optimize the bio-sorption capacity of microorganisms (Bacillus subtilis and Bacillaceae bacterium), the effect of process parameters such as pH, temperature, metal load and culture age on the metal uptake was investigated. Indigenous strains of B. subtilis and Bacillaceae bacterium found in gold and copper mines in South Africa were exposed to silver (I), chromium (III), and lead (II) solutions under different physico-chemical and physiological conditions. Optimum conditions for the uptake of silver (I), chromium (III) and lead (II) by microorganisms used in this study were determined. The pH range 7-8, higher temperature (45 °C) and stationary growth phase, were observed as being suitable physical and physiological conditions for optimum removal of metals (Ag-87.2%; Cr-94% and Pb-98.5%). On the other hand very low pH (3) adversely affected the metal removal ability of bacteria. Silver (I) was the most poorly uptaken metal. It was also found that silver inhibited bacteria growth. Attempt to elute metal from the above cell biomass showed that 56.6% silver (I) and 88.3% lead (II) could effectively be desorbed at pH 5. It was additionally observed that optimum conditions for metal removal were specific to microbial bio-sorbent and the targeted metal. Design and implementation of bioremediation processes therefore require thorough study of specific interactions among metals and bio-sorbents involved.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics and Chemistry of the Earth, Parts A/B/C - Volume 35, Issues 13â14, 2010, Pages 672-678
Journal: Physics and Chemistry of the Earth, Parts A/B/C - Volume 35, Issues 13â14, 2010, Pages 672-678
نویسندگان
E. Fosso-Kankeu, A.F. Mulaba-Bafubiandi, B.B. Mamba, L. Marjanovic, T.G. Barnard,