Studies on the overall oxygen transfer rate and mixing time in pilot-scale surface aeration vessel

Joonwun Kang, Chang-Ha Lee, Seungjoo Haam, K. K. Koo, W. S. Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An aerated vessel with Simcar type surface aerator was studied to estimate its significant performance characteristics i.e., oxygen transfer rate, mixing time and power consumption. The oxygen transfer and mixing characteristics were investigated with variations in the operating variables such as rotational speed, diameter, bottom clearance of impeller, liquid height and power consumption in single and dual impeller systems. The bottom clearance of the top impeller was found to affect largely the capacity of the impeller by varying the quantity of liquid loaded to it. It was also ensured that surface aeration caused a slight increase in mixing time compared to it under ungassed conditions. The dual impeller system was employed for the purpose of improving oxygen transfer and mixing at T/H < 1 varying the types and the bottom clearance of the lower impeller. However, the oxygen transfer rate was independent of the lower impeller mainly depending on the capacity of the top impeller though mixing time was sharply reduced by the lower impeller. The effect of the bottom clearance of the lower impeller was related to the liquid flow pattern inside the vessel, which was presented by computational fluid dynamics (CFD). The oxygen transfer rate and the mixing time were correlated with power consumption within reliable error range.

Original languageEnglish
Pages (from-to)1055-1068
Number of pages14
JournalEnvironmental Technology (United Kingdom)
Volume22
Issue number9
DOIs
Publication statusPublished - 2001 Sep 1

Fingerprint

aeration
vessel
Oxygen
oxygen
Electric power utilization
liquid
Liquids
computational fluid dynamics
flow pattern
Flow patterns
rate
Computational fluid dynamics
consumption

All Science Journal Classification (ASJC) codes

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

Cite this

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Studies on the overall oxygen transfer rate and mixing time in pilot-scale surface aeration vessel. / Kang, Joonwun; Lee, Chang-Ha; Haam, Seungjoo; Koo, K. K.; Kim, W. S.

In: Environmental Technology (United Kingdom), Vol. 22, No. 9, 01.09.2001, p. 1055-1068.

Research output: Contribution to journalArticle

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