Gas Transfer inside a Deep Airlift Reactor
Publication: World Environmental and Water Resources Congress 2008: Ahupua'A
Abstract
Airlift reactors with a bubbly flow are commonly used to add oxygen to the hypolimnion of lakes. However, there is no reliable information on the gas transfer that will occur in a field-scale airlift reactor. Gas transfer experiments are conducted inside a deep bubble column/airlift reactor containing air and water with a maximum aerated water height of 23.4 meters and diameter of 1.06 meters. The effects of geometry and operating conditions on gas transfer are determined. A two-phase convection-dispersion model is fit to the DO measurements using the liquid film coefficient (KL) as a fitting parameter. Sparger differences had a substantial effect upon KL, and the gas transfer coefficient for the airlift reactor was four times that of the bubble column. Results are characterized using Sherwood, Reynolds and Bond numbers. A low Reynolds number exponent was found, indicating that KL in a deep column tends towards a constant and is not highly dependent upon air discharge.
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Copyright
© 2008 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Aeration
- Bodies of water (by type)
- Chemical processes
- Chemistry
- Design (by type)
- Engineering fundamentals
- Entrainment
- Environmental engineering
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid mechanics
- Gas flow
- Geometrics
- Highway and road design
- Hydraulic engineering
- Hydrologic engineering
- Lakes
- Oxygen transfer
- Water and water resources
- Water discharge
- Water management
- Water meters
- Water supply
- Water supply systems
- Water treatment
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