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Journal articles
Biological ferrous sulfate oxidation by A. ferrooxidans immobilized on chitosan beads
Abstract : The immobilization of Acidithiobacillus ferrooxidans cells on chitosan and cross-linked chitosan beads and the biooxidation of ferrous iron to ferric iron in a packed-bed bioreactor were studied. The biofilm formation was carried out by using a glass column reactor loaded with chitosan or cross-linked chitosan beads and 9 K medium previously inoculated with A. ferrooxidans cells. The immobilization cycles on the carrier matrix with the bioreactor operating in batch mode were compared. Then, the reactor was operated using a continuous flow of 9 K medium at different dilution rates. The results indicate that the packed-bed reactor allowed increasing the flow rate of medium approximately two fold (chitosan) and eight fold (chitosan cross-linked) without cells washout, compared to a free cell suspension reactor used as control, and to reach ferric iron productivities as high as 1100 and 1500 mg l− 1 h− 1 respectively.
Scanning electron microscopy micrographs of the beads, infrared spectroscopy and the X-ray diffraction patterns of precipitates on the chitosan beads were also investigated.
https://hal.mines-ales.fr/hal-03212283
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Submitted on : Thursday, April 29, 2021 - 3:20:25 PM
Last modification on : Wednesday, October 20, 2021 - 1:23:04 AM
Long-term archiving on: : Friday, July 30, 2021 - 6:53:06 PM
Contributor : Administrateur Imt - Mines Alès Connect in order to contact the contributor
Submitted on : Thursday, April 29, 2021 - 3:20:25 PM
Last modification on : Wednesday, October 20, 2021 - 1:23:04 AM
Long-term archiving on: : Friday, July 30, 2021 - 6:53:06 PM
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