کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
212271 462039 2014 7 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation of ferrous-iron biooxidation kinetics by Leptospirillum ferriphilum in a novel packed-column bioreactor: Effects of temperature and jarosite accumulation
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موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Investigation of ferrous-iron biooxidation kinetics by Leptospirillum ferriphilum in a novel packed-column bioreactor: Effects of temperature and jarosite accumulation
چکیده انگلیسی


• Ferrous-iron biooxidation kinetics was studied in a novel packed-column bioreactor.
• The bioreactor simulates solution flow dynamics in a typical bioleach heap.
• The overall biooxidation rate is higher than that of stirred tank bioreactor.
• The kinetics is controlled by both biochemical and diffusion factors.
• Accumulation of jarosite increased the kinetics by about 39%.

The kinetics of microbial ferrous-iron by Leptospirillum ferriphilum was studied at substrate loading rate of 3–90 mmol L− 1 h− 1 in a novel packed column bioreactor. The study was conducted with a view to providing an understanding of the reaction kinetics in a flow-through system which may be assumed to mimic bioheap solution flow, rather than the more typical batch reactors. The bioreactor was maintained at pH of 1.45 ± 0.05 and constant air flow rate of 15 mL s− 1. The Boon and Hansford, and the Monod models accurately described the experimental data. The effect of temperature on the kinetic parameters was investigated at 25, 30 and 35 °C. The maximum oxidation rate, rFe2+max = 15.10 mmol L− 1 h− 1, was highest at 35 °C. The activation energy, Ea = 20.97 kJ mol− 1, of ferrous-iron biooxidation in the novel bioreactor is indicative of a system that is limited by both biochemical and diffusion factors. The result also showed about 38.80% increase in the maximum microbial ferrous-iron oxidation,rFe2+max, due to accumulation of jarosite. However, the decreasing values of substrate affinity constant, KFe2+KFe2+, and the apparent affinity constant, K′Fe2+K′Fe2+ revealed that the microbial affinity for ferrous biooxidation increases with increase in jarosite formation. This study reveals that jarosite maybe beneficial to bioleach heaps if it is carefully managed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hydrometallurgy - Volume 141, January 2014, Pages 36–42
نویسندگان
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