期刊
BIORESOURCE TECHNOLOGY
卷 266, 期 -, 页码 89-96出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.06.055
关键词
Computational fluid dynamics; Flash-light; Microalgae; Serial lantern-shaped draft tube; Gaslift loop-current column photobioreactor
资金
- National Key Research and Development Program-China [2016YFB0601003]
- National Natural Science Foundation-China [51476141]
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 x 10(-4)m(2)/s(2) to 26.6 x 10(-4)m(2)/s(2), 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 CO2 fixation peak rate was promoted by 35%.
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