Mathematical Model of the Oxidation of Ferrous Iron by a Biofilm of <i>Thiobacillus ferrooxidans</i>

Mesa, María del Mar; Macı́as, M.; Cantero, Domingo

doi:10.1021/bp020063g

Cited by 15 publications

(9 citation statements)

References 19 publications

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“…35,[38][39][40] We incorporated the inhibition terms into the cell growth kinetics and l in (9) could be written as…”

Section: Effect Of High Initial Fe 21 Concentrationmentioning

confidence: 99%

“…Albeit a cell-immobilized bioreactor is usually of column type, a cost effective novel basket-type CSTBR was designed and kinetics of ferrous iron oxidation was studied. Several models have been proposed for free cell oxidation of ferrous iron, a model to explain immobilized cell process is very limited 35 so far. Most of the models proposed for free cell growth on ferrous iron are modifications of Monod's kinetics.…”

Section: Introductionmentioning

confidence: 99%

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Ferrous iron oxidation by foam immobilized Acidithiobacillus ferrooxidans: Experiments and modeling

Jaisankar

Modak

2009

Biotechnology Progress

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Ferrous iron bio-oxidation by Acidithiobacillus ferrooxidans immobilized on polyurethane foam was investigated. Cells were immobilized on foams by placing them in a growth environment and fully bacterially activated polyurethane foams (BAPUFs) were prepared by serial subculturing in batches with partially bacterially activated foam (pBAPUFs). The dependence of foam density on cell immobilization process, the effect of pH and BAPUF loading on ferrous oxidation were studied to choose operating parameters for continuous operations. With an objective to have high cell densities both in foam and the liquid phase, pretreated foams of density 50 kg/m(3) as cell support and ferrous oxidation at pH 1.5 to moderate the ferric precipitation were preferred. A novel basket-type bioreactor for continuous ferrous iron oxidation, which features a multiple effect of stirred tank in combination with recirculation, was designed and operated. The results were compared with that of a free cell and a sheet-type foam immobilized reactors. A fivefold increase in ferric iron productivity at 33.02 g/h/L of free volume in foam was achieved using basket-type bioreactor when compared to a free cell continuous system. A mathematical model for ferrous iron oxidation by Acidithiobacillus ferrooxidans cells immobilized on polyurethane foam was developed with cell growth in foam accounted by an effectiveness factor. The basic parameters of simulation were estimated using the experimental data on free cell growth as well as from cell attachment to foam under nongrowing conditions. The model predicted the phase of both oxidation of ferrous in shake flasks by pBAPUFs as well as by fully activated BAPUFs for different cell loadings in foam. Model for stirred tank basket bioreactor predicted within 5% both transient and steady state of the experiments closely for the simulated dilution rates. Bio-oxidation at high Fe(2+) concentrations were simulated with experiments when substrate and product inhibition coefficients were factored into cell growth kinetics.

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“…35,[38][39][40] We incorporated the inhibition terms into the cell growth kinetics and l in (9) could be written as…”

Section: Effect Of High Initial Fe 21 Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ferrous iron oxidation by foam immobilized Acidithiobacillus ferrooxidans: Experiments and modeling

Jaisankar

Modak

2009

Biotechnology Progress

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“…As shown in Fig. 1, a Ϫ1 (27). Based on the raw results [i.e., Fe(II) concentrations versus time at 25°C and pH 2.0] obtained in the 24 batch experiments and the knowledge of the cell concentration calculated based on Y and the initial cell concentration, the parameters K S , K P , and max were obtained by applying nonlinear least-squares data fit using the Gauss-Newton algorithm with LevenbergMarquardt modifications for global convergence.…”

Section: Resultsmentioning

confidence: 89%

“…With regard to the inhibition caused by the Fe(III) concentration on the rate of Fe(II) oxidation, both "competitive" and "noncompetitive" models have been suggested. Noncompetitive inhibition to Fe(II) oxidation by Fe(III) has been reported by Jones and Kelly (19) and by Nemati and Webb (31); however, most of the works published to date on A. ferrooxidans have reported competitive product inhibition rather than noncompetitive (5,12,13,15,20,23,27,34).…”

mentioning

confidence: 90%

Improved Experimental and Computational Methodology for Determining the Kinetic Equation and the Extant Kinetic Constants of Fe(II) Oxidation byAcidithiobacillus ferrooxidans

Molchanov

Gendel

Ioslvich

et al. 2007

Appl Environ Microbiol

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“…Reactors with attached A. ferrooxidans that continually produce iron(III) have been employed to enhance metal recovery from ores as well as in other applications [18][19][20][21][22][23][24]. In most cases, the conditions under which the immobilization process was performed led to abundant levels of jarosite [basic iron(III) sulfate] precipitation.…”

Section: Introductionmentioning

confidence: 99%

Ferrous Iron Oxidation by Immobilized on Refractory Clay Tiles

Donati¹

2008

TOBIOTJ

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Refractory clay tiles are composed of kaolin, which is the commercial name of clay, and this consists mainly of kaolinite mineral. Two such tiles and caowool packed in glass columns were used for the immobilization of Acidithiobacillus ferrooxidans cells in a ferrous iron medium, which was percolated through the supports. Colonization was carried out by several media replacements with no further inoculation until maximum ferric iron productivity was reached. One of the tiles was discarded due to the high iron precipitation during bacterial growth. The columns with the other supports were used for ferrous iron oxidation in batch and continuous flow modes of operation and these appeared to be promising supports for A. ferrooxidans. A ferrous iron oxidation rate of 14.5 mmol.l -1 .h -1 was reached in one of the columns in the continuous culture. After being used for several cultures, pieces of tiles with immobilized cells were stored at 4 ºC. Samples at different times were incubated in ferrous medium and these showed high cell activity even after 6 months.

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Mathematical Model of the Oxidation of Ferrous Iron by a Biofilm of Thiobacillus ferrooxidans

Cited by 15 publications

References 19 publications

Ferrous iron oxidation by foam immobilized Acidithiobacillus ferrooxidans: Experiments and modeling

Ferrous iron oxidation by foam immobilized Acidithiobacillus ferrooxidans: Experiments and modeling

Improved Experimental and Computational Methodology for Determining the Kinetic Equation and the Extant Kinetic Constants of Fe(II) Oxidation byAcidithiobacillus ferrooxidans

Ferrous Iron Oxidation by Immobilized on Refractory Clay Tiles

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