Journal
BIORESOURCE TECHNOLOGY
Volume 190, Issue -, Pages 29-35Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.04.050
Keywords
Microalgae; Raceway pond; Chute baffle; Flash light; Flow field
Funding
- National High Technology R&D Program - China [2012AA050101]
- National Natural Science Foundation - China [51176163, 51476141]
- Zhejiang Provincial Natural Science Foundation - China [LR14E060002]
- Program of Introducing Talents of Discipline to University - China [B08026]
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Novel up-down chute baffles that sequentially generate clockwise and anticlockwise liquid vortexes were developed to increase vertical liquid velocity between the bottom dark area and the top light area in a raceway pond. The vertical liquid velocity, mixing time, and mass transfer coefficient were measured as functions of paddlewheel speed and air aeration rate by using a particle imaging velocimeter, pH probes, and dissolved oxygen probes. The up-down chute baffles decreased the liquid mixing time and increased the mass transfer coefficient by 41% and 25%, respectively. Besides, the vertical liquid velocity increased from similar to 0.5 cm/s to similar to 6.1 cm/s. As a result, the dark-light cycle period was reduced to 1/12. This enhanced flashing light effect with up-down chute baffles increased biomass yield by 32.6% in the same raceway pond. (C) 2015 Elsevier Ltd. All rights reserved.
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