Microbial Ferrous Ion Oxidation versus Ferric Ion Precipitation at Low Temperature Conditions

Emmanuel Chinonso Chukwuchendo; Tunde Victor Ojumu

doi:10.4028/www.scientific.net/SSP.262.381

Paper Titles

Microorganisms Oxidize Iron (II) Ions in the Presence of High Concentrations of Sodium Chloride - Potentially Useful for Bioleaching
p.364

Expression of Candidate Cold Stress and Metabolic Related Genes in Acidithiobacillus ferrivorans PQ33 Strain Using Ferrous Iron as Electron Donor
p.368

Bioleaching of Pyrite by Iron-Oxidizing Acidophiles under the Influence of Reactive Oxygen Species
p.372

Transcription Dynamics of CBB-Pathway Genes in Acidithiobacillus thiooxidans Growing under Different CO₂ Levels
p.376

Microbial Ferrous Ion Oxidation versus Ferric Ion Precipitation at Low Temperature Conditions
p.381

Comparative Study of NaCl-Tolerance Mechanisms in Acidophilic Iron-Oxidizing Bacteria and Archaea
p.385

Use of Specific Metal Binding of Self-Assembling S-Layer Proteins for Metal Bioremediation and Recycling
p.389

Biochemical Aspects of Energy Metabolism in Sulfobacillus thermotolerans
p.394

Adhesion Studies of Microorganisms on Natural Ore Material
p.398

HomeSolid State PhenomenaSolid State Phenomena Vol. 262Microbial Ferrous Ion Oxidation versus Ferric Ion...

Microbial Ferrous Ion Oxidation versus Ferric Ion Precipitation at Low Temperature Conditions

Abstract:

Ferric ion precipitation in a typical bioleach operation is known to be inevitable. However, its management has been emphasized as critical to efficiently maximize the potential that bioleach technique offers, especially in heap bioleach systems. Although there are some studies on ferric ion precipitation, limited studies exist in the context of a cold condition which often prevails in some operations. This study investigated ferrous ion biooxidation and ferric ion precipitation under cold temperature conditions. The results showed that maximum ferrous ion oxidation rates of 1.05, 1.25, 1.51 and 1.60 mmol/L/h at 6, 7, 8 and 10°C respectively were achieved in packed column reactor. The results further showed a simultaneous ferric ion precipitation during the oxidation process. The kinetics of ferric ion precipitation follows a first order kinetics with the rate constants of 0.0066, 0.0074, 0.0080 and 0.011 h^-1_. Activation energies of 68 and 77 kJ/mol were obtained for both ferrous ion biooxidation and ferric ion precipitation respectively. Although slow kinetics are expected for both processes, the kinetics information may be useful for design management consideration at least to predict when bioleach liquor would likely run out of dissolved ferric ion.

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Solid State Phenomena (Volume 262)

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381-384

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https://doi.org/10.4028/www.scientific.net/SSP.262.381

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August 2017

Authors:

Emmanuel Chinonso Chukwuchendo, Tunde Victor Ojumu*

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Activation Energy, Ferric Ion Precipitate, Packed Column Bioreactor

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