Oxygen transfer characteristics in a pilot scale surface aeration vessel with simcar aerator

M. Lee, J. Kang, C. H. Lee, S. Haam, Hun Hwee Park, W. S. Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The volumetric mass transfer coefficient, KLa, was determined by dynamic method in a surface aerated pilot scale squared vessel up to 0.531m3 equipped with Simcar type impeller. Through surface aeration, the oxygen transfer characteristics were investigated with the variations of operating variables such as stirring speed, impeller diameter, liquid height and power input per liquid volume (Po/V). It was seen from the results of different oxygen concentration absorption that the dynamic method might lead to errors in KLa when air was used for absorption. To provide reliable KLa values measured by dynamic, the KLa data using pure oxygen were used and confirmed with feeding steady-state method (FSM). As expected, KLa depends on Po/V, impeller size and liquid height. However, for Simcar type impeller, the KLa shows linear dependency on Po/V in contrast to majority of correlations reported in the literature which shows KLa ∝ (Po/V)0.65 for disk type impeller. Moreover, it was interesting to find that the bubble behaviors inside the vessel computed by computational fluid dynamics (CFD) could explain qualitatively the KLa changes with operating variables. For the purpose of scale-up procedures, the empirical correlations for predicting KLa were developed within ±2% accuracy.

Original languageEnglish
Pages (from-to)57-68
Number of pages12
JournalEnvironmental Technology (United Kingdom)
Volume22
Issue number1
DOIs
Publication statusPublished - 2001 Jan 1

Fingerprint

aeration
vessel
Oxygen
oxygen
liquid
Liquids
computational fluid dynamics
bubble
mass transfer
Computational fluid dynamics
Mass transfer
air
Air
method
speed

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal

Cite this

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abstract = "The volumetric mass transfer coefficient, KLa, was determined by dynamic method in a surface aerated pilot scale squared vessel up to 0.531m3 equipped with Simcar type impeller. Through surface aeration, the oxygen transfer characteristics were investigated with the variations of operating variables such as stirring speed, impeller diameter, liquid height and power input per liquid volume (Po/V). It was seen from the results of different oxygen concentration absorption that the dynamic method might lead to errors in KLa when air was used for absorption. To provide reliable KLa values measured by dynamic, the KLa data using pure oxygen were used and confirmed with feeding steady-state method (FSM). As expected, KLa depends on Po/V, impeller size and liquid height. However, for Simcar type impeller, the KLa shows linear dependency on Po/V in contrast to majority of correlations reported in the literature which shows KLa ∝ (Po/V)0.65 for disk type impeller. Moreover, it was interesting to find that the bubble behaviors inside the vessel computed by computational fluid dynamics (CFD) could explain qualitatively the KLa changes with operating variables. For the purpose of scale-up procedures, the empirical correlations for predicting KLa were developed within ±2{\%} accuracy.",
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AU - Kang, J.

AU - Lee, C. H.

AU - Haam, S.

AU - Park, Hun Hwee

AU - Kim, W. S.

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