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Numerical simulation on promoting light/dark cycle frequency to improve microalgae growth in photobioreactor with serial lantern-shaped draft tube.
- Source :
-
Bioresource technology [Bioresour Technol] 2018 Oct; Vol. 266, pp. 89-96. Date of Electronic Publication: 2018 Jun 20. - Publication Year :
- 2018
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Abstract
- Computational fluid dynamics were employed to simulate microalgal cells movement with enhanced flash-light effects in a gaslift loop-current column photobioreactor (GLCP) with serial lantern-shaped draft tube (LDT). Clockwise and anticlockwise vortexes were formed in outer down-flow region of GLCP with LDT. The radial velocity, axial velocity, and turbulent kinetic energy of microalgal solution appeared periodical change around the lanterns. The average radial velocity showed a sixfold improvement from 0.003 m/s to 0.021 m/s, and average turbulent kinetic energy was enhanced by 18.2% from 22.5 × 10 <superscript>-4</superscript> m <superscript>2</superscript> /s <superscript>2</superscript> to 26.6 × 10 <superscript>-4</superscript> m <superscript>2</superscript> /s <superscript>2</superscript> , thus increasing light/dark cycle frequency by 54%. The light/dark cycle frequency increased first and then decreased with an increase of individual lantern height. The increased lantern number promoted the light/dark cycle frequency and light time ratio. Microalgal biomass yield in the GLCP with LDT was improved by 30%, and CO <subscript>2</subscript> fixation peak rate was promoted by 35%.<br /> (Copyright © 2018 Elsevier Ltd. All rights reserved.)
- Subjects :
- Biomass
Light
Photobiology
Photoperiod
Microalgae
Photobioreactors
Subjects
Details
- Language :
- English
- ISSN :
- 1873-2976
- Volume :
- 266
- Database :
- MEDLINE
- Journal :
- Bioresource technology
- Publication Type :
- Academic Journal
- Accession number :
- 29957295
- Full Text :
- https://doi.org/10.1016/j.biortech.2018.06.055