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Type: Journal article
Title: Hydrodynamics and mass transfer coefficient in three-phase air-lift reactors containing activated sludge
Author: Jin, B.
Yin, P.
Lant, P.
Citation: Chemical Engineering and Processing, 2006; 45(7):608-617
Publisher: Elsevier Science SA
Issue Date: 2006
ISSN: 0255-2701
Statement of
Bo Jin, Pinghe Yin and Paul Lant
Abstract: This study was to investigate the impacts of operating conditions and liquid properties on the hydrodynamics and volumetric mass transfer coefficient in activated sludge air-lift reactors. Experiments were conducted in internal and external air-lift reactors. The activated sludge liquid displayed a non-Newtonian rheological behavior. With an increase in the superficial gas velocity, the liquid circulation velocity, gas holdup and mass transfer coefficient increased, and the gas residence time decreased. The liquid circulation velocity, gas holdup and the mass transfer coefficient decreased as the sludge loading increased. The flow regime in the activated sludge air-lift reactors had significant effect on the liquid circulation velocity and the gas holdup, but appeared to have little impact on the mass transfer coefficient. The experimental results in this study were best described by the empirical models, in which the reactor geometry, superficial gas velocity and/or power consumption unit, and solid and fluid properties were employed.
Keywords: Activated sludge; Air-lift reactor; Gas holdup; Apparent viscosity; Liquid circulation velocity; Superficial gas velocity; Mass transfer coefficient
RMID: 0020081480
DOI: 10.1016/j.cep.2005.08.007
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Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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