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Immobilization of Acidithiobacillus ferrooxidans on monolithic packing for biooxidation of ferrous iron

Kahrizi, E ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: 2008
  3. Abstract:
  4. The oxidation of ferrous iron (Fe2+) in solution using Acidithiobacillus ferrooxidans has industrial applications exclusively in the regeneration of ferric iron (Fe3+) as an oxidizing agent for the removal of hydrogen sulfide from waste gases, desulfurization of coal, leaching of non-ferrous metallic sulfides and treatment of acid mine drainage. The aim of this investigation was to increase the bio-oxidation rate of ferrous sulfate by using immobilized cells. Rate of Fe2+ oxidation was determined in a packed-bed bioreactor configuration with monolithic particles being used as support material. Biooxidation of ferrous iron by immobilized cells was investigated in repeated batch culture and continuous operation using a laboratory scale packed-bed bioreactor. On this account, effects of process variables such as dilution rate and initial concentrations of Fe2+ on oxidation of ferrous sulfate were consequently investigated. During repeated batch culture, the immobilized-cells were stable and showed high constant iron-oxidizing activities. A maximum Fe2+ oxidation rate of 6.7 g/l/h was achieved at the dilution rate of 2 h-1, while no obvious precipitate was detected in the bioreactor
  5. Keywords:
  6. Ferrous ion ; Ferrous sulfate ; Acidithiobacillus ferrooxidans ; Analytic method ; Bacterial growth ; Bacterial strain ; Bacterium culture ; Dilution ; Immobilized cell ; Nonhuman ; Oxidation ; Packed bed reactor ; Acidithiobacillus ferrooxidans
  7. Source: Iranian Journal of Biotechnology ; Volume 6, Issue 3 , 2008 , Pages 137-143 ; 17283043 (ISSN)
  8. URL: http://www.ijbiotech.com/article_7047.html