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Journal of Applied Electrochemistry

, Volume 37, Issue 8, pp 887–892 | Cite as

Influence of current density on oxygen transfer in an electroflotation cell

  • L. Ben Mansour
  • K. Kolsi
  • I. Ksentini
Original Paper

Abstract

The objective of this work is to study the transfer of oxygen from gas to liquid phase in an electroflotation cell. The measurements were performed in a laboratory scale cell using insoluble electrodes, titanium coated with ruthenium oxide as anode and stainless steel as cathode. The volumetric mass transfer coefficient K L a, was characterized for clean tap water as liquid phase for different values of current density (J). The global coefficient of mass transfer based on the liquid film, K L , and the specific interfacial area, a, were characterized. A model which relates K L a to current density was established. Different evaluation criteria of oxygen transfer in electroflotation process were determined and compared with other aeration process.

Keywords

Current density Electroflotation Oxygen transfer 

Nomenclature

a

specific interfacial area (m2 m−3)

A

gas-liquid interface area (m2)

C

oxygen concentration in the liquid (g m−3)

C*

oxygen equilibrium concentration in the liquid (g m−3)

C0

initial dissolved oxygen concentration (g m−3)

J

current density (A m−2)

dB

bubble diameter (μm)

F

Faraday constant (C mol−1)

HS

static height of the liquid bed (m)

HT

total height of the gas – liquid bed (m)

KL

global coefficient of mass transfer based on liquid film (m s−1)

KLa

volumetric mass transfer coefficient (s−1)

\({m_{O_2 }}\)

oxygen flow rate (g s−1)

\({M_{O_2 }}\)

oxygen molar mass (g mol−1)

OC

oxygenation capacity (g m−3 h−1)

RO

oxygenation efficiency (%)

S

surface of the electrodes (m2)

T

temperature of the liquid phase (°C)

V

aerated liquid volume (m3)

Greek symbols

εg

gas hold-up (%)

θ

empirical coefficient in Eq. (7)

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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  1. 1.Sciences Faculty of SfaxLaboratory of Water – Environment and EnergySfaxTunisia

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