Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 1, Pages 384-393Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b03718
Keywords
Microalgae; Column photobioreactor; Light/dark cycle; CO2 fixation; Actual photochemical efficiency
Categories
Funding
- National Key Research and Development Program of China [2016YFB0601002]
- National Natural Science Foundation of China [51476141, 51608501]
- China Postdoctoral Science Foundation [2017M621940]
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A novel tangential spiral-flow column photo-bioreactor (TSCP) was developed to strengthen the velocity field and turbulent kinetics for improving CO2 fixation with microalgae. Microalgal solution was injected into a column photobioreactor from four symmetrically arranged nozzles, whose central axes had 10 degrees-included angles with the radius. The injection solution streamline formed a tangential swirling circle, thereby driving the surrounding solution to spirally flow upward. This flow pattern was determined via computational fluid dynamics simulation and a miniature Doppler velocimeter. The optimal structural and operational parameters were determined as follows: relative diameter of imaginary tangential circle = 0.3, nozzles number = 4, and injection solution velocity = 1.33 m/s. The average turbulent kinetic energy, bubble diameter, and actual photochemical efficiency in TSCP were 15% higher, 47% lower, and 19% higher than those in the bubble column photobioreactor (BCP), respectively. Therefore, the microalgal biomass yield and maximum CO2 fixation rate in TSCP were promoted by 1.4 times and 53%, respectively.
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