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Serial lantern-shaped draft tube enhanced flashing light effect for improving CO 2 fixation with microalgae in a gas-lift circumflux column photobioreactor.
- Source :
-
Bioresource technology [Bioresour Technol] 2018 May; Vol. 255, pp. 156-162. Date of Electronic Publication: 2018 Jan 31. - Publication Year :
- 2018
-
Abstract
- A novel serial lantern-shaped draft tube (LDT) that generates vortices is proposed to increase radial velocity between dark and light regions for improving CO <subscript>2</subscript> fixation with microalgae in a gas-lift circumflux column (GCC) photobioreactor. Clockwise vortices are generated in the downflow outerloop of the GCC photobioreactor with LDT. Radial velocity was improved from 1.50 to 4.35 × 10 <superscript>-2</superscript> m/s, thereby decreased liquid cycle period between dark and light regions by 1.9 times. Mixing time decreased by 21%, and mass transfer coefficient increased by 26% with LDT. Liquid radial velocity in the downflow outerloop and mass transfer coefficient in the GCC photobioreactor both first increased and then decreased when single-lantern height was increased. Peak CO <subscript>2</subscript> fixation rate increased from 0.62 to 0.87 g/L/d, microalgal biomass yield increased by 50%. Removal efficiencies of pollutants (chemical oxygen demand, ammonium, tilmicosin, and ethinylestradiol) in wastewater were 62-90% with microalgae growth in GCC photobioreactor with LDT.<br /> (Copyright © 2018 Elsevier Ltd. All rights reserved.)
- Subjects :
- Biomass
Carbon Dioxide
Light
Photobiology
Microalgae
Photobioreactors
Subjects
Details
- Language :
- English
- ISSN :
- 1873-2976
- Volume :
- 255
- Database :
- MEDLINE
- Journal :
- Bioresource technology
- Publication Type :
- Academic Journal
- Accession number :
- 29414161
- Full Text :
- https://doi.org/10.1016/j.biortech.2018.01.127