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Improvement of mixing time, mass transfer, and power consumption in an external loop airlift photobioreactor for microalgae cultures

Paper ID Volume ID Publish Year Pages File Format Full-Text
3204 157 2014 8 PDF Available
Title
Improvement of mixing time, mass transfer, and power consumption in an external loop airlift photobioreactor for microalgae cultures
Abstract

•tm is the crucial factor for governing the hydrodynamic and mass transfer properties.•The configuration provided an effective counter-current flow in downcommer.•The geometry provided significant decrease in P/V compared to other configurations.

Longer mixing times and higher power consumption are common problems in the design of photobioreactors. In this study, a vertical triangular external airlift loop photobioreactor was designed, constructed and operated for microalgae production studies. Gas feeding was performed by two spargers: one at the bottom of the hypotenuse (downcomer) and another at the bottom of the vertical side (riser). This configuration provided more effective countercurrent liquid–gas flow in the hypotenuse. The mass transfer coefficient, gas hold-up, mixing time, circulation time, dimensionless mixing time, bubble size, and volumetric power consumption were measured and optimized using response surface methodology. Investigations were carried out on the performance of the riser (the vertical side), downcomer (the hypotenuse), and separator. The countercurrent flow in the hypotenuse provided sufficient contact between gas and liquid phases, and increased mixing and mass transfer rates, in contrast to the results of previous studies. The promising results of this geometry were shorter mixing time and a significant decrease in volumetric power consumption in comparison with other configurations for photobioreactors.

Keywords
Airlift bioreactors; Mixing; Gas hold-up; Mass transfer; Power consumption; Counter-current flow
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Improvement of mixing time, mass transfer, and power consumption in an external loop airlift photobioreactor for microalgae cultures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 87, 15 June 2014, Pages 25–32
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us