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Combined biological and chemical oxidation of ferrous sulfate using immobilised Thiobacillus ferrooxidans



Combined biological and chemical oxidation of ferrous sulfate using immobilised Thiobacillus ferrooxidans



Journal of Chemical Technology & Biotechnology 74(6): 562-570



Thiobacillus ferrooxidans immobilised in biomass support particles with activated carbon coating were used in a packed-bed bioreactor to study the combined effects of chemical and biological catalysis on the oxidation of ferrous iron. The effect of ferrous iron concentration (in the range 5-30 kg m-3) and of its volumetric loading on the kinetics of reaction were investigated. With low concentrations of ferrous iron, 5-10 kg m-3, the combined catalysis did not offer a significant advantage to oxidation of ferrous iron and the kinetics of reaction were slightly faster than those achieved with just the biological catalyst. With ferrous iron at a concentration of 20 kg m-3, the combination of chemical and biological catalysis resulted in a remarkable enhancement of the reaction rate. The maximum oxidation rate of ferrous iron in the presence of combined catalysts, 21.9 kg m-3 h-1, was twice as high as that achieved with just the biological catalyst.

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Accession: 010346416

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DOI: 10.1002/(sici)1097-4660(199906)74:6<562::aid-jctb75>3.0.co;2-#


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