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Optimization of Energy Consumption and Mass Transfer Parameters in a Surface Aeration Vessel
Author(s) -
Mohammadpour A.,
AkhavanBehabadi M. A.,
Ebrahimzadeh M.,
Raisee M.,
MajdiNasab A. R.,
Nosrati M.,
Mousavi S. M.
Publication year - 2016
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143016x14504669768093
Subject(s) - impeller , aeration , materials science , immersion (mathematics) , mass transfer , turbine , power consumption , void (composites) , rushton turbine , mechanics , environmental science , mechanical engineering , mathematics , composite material , engineering , power (physics) , physics , waste management , thermodynamics , geometry
ABSTRACT: This paper reports tests on a lab‐scale surface aeration vessel was equipped with a Rushton turbine to examine its performance in terms of standard aeration efficiency (SAE), mixing time, and void fraction characteristics. These characteristics were investigated by tests using variations of rotor speed, impeller immersion depth, and water level. Results showed that variation of impeller immersion depth had a greater effect on the SAE compared to variation of water level. Moreover, the SAE increased with rotor speeds up to about 150 to 200 rpm and then decreased. In addition, void fraction improved by impeller immersion depth and rotor speed enhancement; however, mixing time and power number were reduced as rotor speed increased. According to the response surface methodology statistical optimizations, optimum values for rotor speed, impeller immersion depth, and water level were 168.90 rpm, 25 mm, and 30 cm, respectively, to achieve the maximum value of SAE.