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Oxygen transfer rate behavior in three phase electroflotation column

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Abstract

The effects of bubble size, solids particle (impurities) and the respective physical mechanisms on gas–liquid columns have received little attention. Therefore, the objective of this work is to study the effect of solid concentration and the ratio of the bubble diameter to the solid diameter on the mass transfer characteristics. Experiments were conducted in a three phase electroflotation column for the systems gas/water/olive stone. Volumetric mass transfer coefficient, kLa, was measured under different solid concentrations values (1–3 g/l) and ratio of the bubble diameter to the solid diameter values. It was found that the kLa rises when the ratio of the bubble diameter to the solid diameter increase. The presence of solid particle has a negative effect on mass transfer coefficients (kLa,kL and a). The liquid side mass transfer coefficient has the same behavior as the volumetric mass transfer coefficient. The capacity of oxygenation CO was also studied. Models relating the mass transfer coefficients kLa, kL and CO were elaborated in each case using linear regression method.

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Abbreviations

a:

Specific interfacial area (m2 m−3).

C:

Oxygen concentration (Kg m−3).

C*:

The saturated oxygen concentration in liquid phase (Kg m−3).

C0 :

The initial dissolved oxygen concentration (Kg m−3).

Cs:

Solid concentration (Kg m−3).

dB :

Bubble diameter (m).

dS :

Solid diameter (m).

kL :

The liquid side mass transfer coefficient (m s−1).

kLa:

The volumetric mass transfer coefficient (s−1).

CO:

Oxygenation capacity (O2/m3.h).

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Authors and Affiliations

  1. Laboratory of Applied Fluid Mechanics – Process Engineering and Environment, Sfax University, Sfax, Tunisia

    Maroua Mejri & Lassaad Ben Mansour

  2. National Engineering School of Gabes, Gabes, Tunisia

    Maroua Mejri

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  1. Maroua Mejri
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  2. Lassaad Ben Mansour
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Correspondence to Maroua Mejri.

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Mejri, M., Mansour, L.B. Oxygen transfer rate behavior in three phase electroflotation column. Heat Mass Transfer 57, 1205–1210 (2021). https://doi.org/10.1007/s00231-021-03016-x

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