کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4769077 | 1425536 | 2017 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Overcoming the bacteriostatic effects of heavy metals on Acidithiobacillus thiooxidans for direct bioleaching of saprolitic Ni laterite ores
ترجمه فارسی عنوان
غلبه بر اثرات باکتری های موضعی فلزات سنگین بر اسیدیتیوباسیلوس تیوکسیدانها برای بیوفیزیک مستقیم سنگ معدن سابلیستیک نیترات
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
In this study, the adaptation of Acidithiobacillus thiooxidans to heavy metals leached from saprolitic Ni laterite ores from Riverina, Australia, was performed by gradual acclimatisation. The microorganism was cultivated in heavy metals (Ni, Co, Fe, Mg, Cr and Mn) with total concentrations of 2400 to 24,000Â ppm equivalent to total dissolution of 1 to 10% (w/v) pulp densities of the saprolitic Ni laterite ore. Adaptation evolution mapped from its tolerance index was found to be dependent on metal concentration, acid generation, and period of adaptation. Bio-stimulation of cell growth and acid production was promoted by heavy metal stress on the bacteria. Pre-established heavy metal tolerance of the bacterial strain improved the leaching rate in its early phase; 20% and 7% increase in Ni and Co metal recoveries were observed in using adapted bacteria. However heavy metal tolerance was also achieved by the bacterium during the leaching process, albeit delayed by a lag phase. These results confirm the robust nature and suitability of A. thiooxidans in direct bioleaching of Ni ores.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 168, March 2017, Pages 21-25
Journal: Hydrometallurgy - Volume 168, March 2017, Pages 21-25
نویسندگان
Hee-Chan Jang, Marjorie Valix,