Journal
BIORESOURCE TECHNOLOGY
Volume 320, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124337
Keywords
Biomass dry weight; Tesla-valve photobioreactor (TV-PBR); Photochemical efficiency; Mixing time; Mass transfer
Funding
- National key research and development program-China [2019YFE0100100]
- Zhejiang Provincial Key Research and Development Program-China [2020C04006]
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The use of Tesla-valve baffles in a column photobioreactor optimizes the flow field to enhance CO2 mass transfer, leading to increased biomass yield and improved helix pitch and trichome length.
In this study, the Tesla-valve (TV) baffles were used to optimize the flow field in a column photobioreactor (PBR) in order to promote mass transfer of CO2 gas in the solution. The TV baffles were composed of many tilted plates with central holes and curved arcs facing downwards, installed along inner rising section of the column PBR. Many clockwise and anti-clockwise vortices were generated during the rising flow while passing through proposed TV baffles. An optimum TV baffle structure (30 degrees plate angle, 8 cm arc width) decreased mixing time by 36.4% and increased the mass transfer coefficient by 50%. The TV baffles supported the movement of the A. platensis cells between light and dark regions to enhance their photochemical efficiency phi PSII by 24.6% and Fv/Fm by 12.7%. Therefore, the biomass yield increased by 28.1% and exhibited an increased helix pitch and trichome length in comparison with traditional column PBR without baffles.
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