Effect of organic solvents on oxygen mass transfer in multiphase systems: Application to bioreactors in environmental protection

Dumont, Éric; Andrès, Yves; Cloirec, Pierre Le

doi:10.1016/j.bej.2006.05.003

Cited by 66 publications

(37 citation statements)

References 54 publications

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“…There are some reports in literature (Dumont et al, 2006;Elibol and Mavituna, 1997;Elibol, 1999;Elibol and Mavituna, 1999) showing the k L a dependence on different kinds of systems as a function of PFC concentration. Obviously the k L a values depend on the concentration range studied, on the type of bioreactor used, and on the geometrical conditions being operated.…”

mentioning

confidence: 97%

Optimization of oxygen mass transfer in a multiphase bioreactor with perfluorodecalin as a second liquid phase

Amaral

Freire

Rocha-Leão

et al. 2007

Biotech & Bioengineering

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Oxygenation is an important parameter involved in the design and operation of mixing-sparging bioreactors and it can be analyzed by means of the oxygen mass transfer coefficient (k(L)a). The operational conditions of a stirred, submerged aerated 2-L bioreactor have been optimized by studying the influence of a second liquid phase with higher oxygen affinity (perfluorodecalin or olive oil) in the k(L)a. Using k(L)a measurements, the influence of the following parameters on the oxygen transfer rate was evaluated: the volume of working medium, the type of impellers and their position, the organic phase concentration, the aqueous phase composition, and the concentration of inactive biomass. This study shows that the best experimental conditions were achieved with a perfluorodecalin volume fraction of 0.20, mixing using two Rushton turbines with six vertical blades and in the presence of YPD medium as the aqueous phase, with a k(L)a value of 64.6 h(-1). The addition of 20% of perfluorodecalin in these conditions provided a k(L)a enhancement of 25% when pure water was the aqueous phase and a 230% enhancement when YPD medium was used in comparison to their respective controls (no perfluorodecalin). Furthermore it is shown that the presence of olive oil as a second liquid phase is not beneficial to the oxygen transfer rate enhancement, leading to a decrease in the k(L)a values for all the concentrations studied. It was also observed that the magnitude of the enhancement of the k(L)a values by perfluorodecalin depends on the biomass concentration present.

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confidence: 97%

Optimization of oxygen mass transfer in a multiphase bioreactor with perfluorodecalin as a second liquid phase

Amaral

Freire

Rocha-Leão

et al. 2007

Biotech & Bioengineering

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“…However, when the aqueous and organic phases are mutually saturated, it has been demonstrated that S Naq/Aq becomes negative at equilibrium (S = −0.8 mNm −1 for silicone oils whose viscosity is 5 mPa s), which ultimately implies that silicone oils remain as discrete droplets. 51,52 However, these studies do not take into account the presence of SE. It is for this reason that the impact of the SE produced by Rhodococcus erythropolis T902.1 on S Naq/Aq was evaluated here.…”

mentioning

confidence: 97%

Effect of surfactants and biomass on the gas/liquid mass transfer in an aqueous‐silicone oil two‐phase partitioning bioreactor using Rhodococcus erythropolis T902.1 to remove VOCs from gaseous effluents

Aldric

Gillet

Delvigne

et al. 2009

J of Chemical Tech & Biotech

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“…In such gasliquid-liquid processes, the mass transfer coefficient K L a is a key parameter in estimating reactor performance [5][6][7][8][9][10][11]. The mass transfer mechanism depends upon the dynamics of the system in which it occurs [12] but, in the case of TPPBs, the K L a change due to the addition of a nonaqueous phase (NAP) to the aqueous phase seems difficult to predict.…”

Section: Introductionmentioning

confidence: 99%

Volumetric mass transfer coefficients characterising VOC absorption in water/silicone oil mixtures

Dumont¹,

Darracq²,

Couvert³

et al. 2013

Chemical Engineering Journal

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The physical absorption of three Volatile Organic Compounds (dimethyldisulphide (DMDS), dimethylsulphide (DMS) and toluene) in "water/silicone oil" systems at a constant flow rate for mixtures of different compositions (φ = 0, 5, 10, 15, 20 and 100%) was investigated using a dynamic absorption method. The results indicate that silicone oil addition leads to a dramatic decrease in K L a which can be related to the change in the partition coefficient (H mix ). They confirm the results obtained for styrene absorption using another measurement technique [15].The interpretation of the results using dimensionless ratiosversus φ also confirms the importance of the partition coefficient ratio m R = H water /H oil in the K L a change. Moreover, the results obtained for toluene absorption in "air/water/silicone oil" systems (φ = 10, 15 and 20%) suggest that the mass transfer pathway is in the order gas→water→oil for these operating conditions. Key-wordsAbsorption; Mass Transfer; Hydrophobic VOC; TPPB; Silicone oil

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Effect of organic solvents on oxygen mass transfer in multiphase systems: Application to bioreactors in environmental protection

Cited by 66 publications

References 54 publications

Optimization of oxygen mass transfer in a multiphase bioreactor with perfluorodecalin as a second liquid phase

Optimization of oxygen mass transfer in a multiphase bioreactor with perfluorodecalin as a second liquid phase

Effect of surfactants and biomass on the gas/liquid mass transfer in an aqueous‐silicone oil two‐phase partitioning bioreactor using Rhodococcus erythropolis T902.1 to remove VOCs from gaseous effluents

Volumetric mass transfer coefficients characterising VOC absorption in water/silicone oil mixtures

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