Kinetics of continuous ferrous ion oxidation by Acidithiobacillus ferrooxidans immobilized in poly(vinyl alcohol) cryogel carriers
| العنوان: | Kinetics of continuous ferrous ion oxidation by Acidithiobacillus ferrooxidans immobilized in poly(vinyl alcohol) cryogel carriers |
|---|---|
| المؤلفون: | Zhong-er Long, Yunhong Huang, Wei Cong, Zhaoling Cai, Fan Ouyang |
| المصدر: | Hydrometallurgy. 74:181-187 |
| بيانات النشر: | Elsevier BV, 2004. |
| سنة النشر: | 2004 |
| مصطلحات موضوعية: | inorganic chemicals, Vinyl alcohol, digestive, oral, and skin physiology, Inorganic chemistry, Kinetics, Metals and Alloys, Alcohol, Industrial and Manufacturing Engineering, Ferrous, Dilution, Ion, chemistry.chemical_compound, chemistry, Bioleaching, Materials Chemistry, Bioreactor |
| الوصف: | Bio-oxidation of ferrous ion by immobilized Acidithiobacillus ferrooxidans is potentially useful in the new technology of two-step bioleaching. The kinetics of continuous oxidation of ferrous ion by PVA-cryogel-immobilized A. ferrooxidans was investigated in a 365-ml packed-bed bioreactor. The effects of ferrous ion concentration and operating dilution rate of the bioreactor on the kinetics of ferrous ion oxidation were examined. Media containing 1-11.5 g/L ferrous ion were tested. For each medium, the kinetics of reaction at different dilution rate, at a constant temperature of 31degreesC, were determined. For a medium containing 3.8 g/L or less ferrous ion, the oxidation rate was proportional to the dilution rate of the bioreactor, and the highest oxidation rate of 2.3 g/L h was achieved at the dilution rate of 0.76 l/h with a medium containing 3.8 g/L ferrous iron. In contrast, for a medium containing more ferrous ion, the kinetic performance of the bioreactor showed a plateau region that was independent of volumetric loading or even exhibited a decrease at high dilution rate. Under these circumstances, the increase of concentration of ferrous ion led to a lower dilution rate, at which the maximum oxidation rate was achieved, and a lower maximum oxidation rate. The results indicated an inhibitory effect of high ferrous ion concentration on the activity of immobilized A. ferrooxidans. (C) 2004 Elsevier B.V. All rights reserved. |
| تدمد: | 0304-386X |
| DOI: | 10.1016/j.hydromet.2004.03.006 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::27cc91c56936fae715f3948d6db3c88e https://doi.org/10.1016/j.hydromet.2004.03.006 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........27cc91c56936fae715f3948d6db3c88e |
| قاعدة البيانات: | OpenAIRE |
كن أول من يترك تعليقا!