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Decrease in light/dark cycle of microalgal cells with computational fluid dynamics simulation to improve microalgal

Zongbo Yang1, Jun Cheng1, Qing Ye1

  • 1State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.

Bioresource Technology
|September 4, 2016
PubMed
Summary
This summary is machine-generated.

Up-down chute baffles enhance microalgal biomass yield by optimizing light/dark (L/D) cycles. This study used computational fluid dynamics to show baffles decrease L/D periods and increase fluid velocity, boosting yield by 22%.

Keywords:
Computational fluid dynamicsFlashing lightMicroalgaeRaceway pond

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Area of Science:

  • Fluid Dynamics
  • Biotechnology
  • Algal Cultivation

Background:

  • Optimizing light/dark (L/D) cycles is crucial for microalgal growth.
  • Vortex flow fields can influence algal exposure to light.
  • Computational fluid dynamics (CFD) offers a method to study fluid dynamics in bioreactors.

Purpose of the Study:

  • To systematically analyze algal movement in a vortex flow field using CFD.
  • To investigate the impact of up-down chute baffles on L/D cycle periods and fluid velocity.
  • To determine the effect of these modifications on microalgal biomass yield.

Main Methods:

  • Computational Fluid Dynamics (CFD) simulations were employed.
  • Algal movement was analyzed in a vortex flow field generated by up-down chute baffles.
  • Parameters investigated included paddlewheel speed, microalgal concentration, average cell L/D cycle period, vertical fluid velocity, and time in the light zone.

Main Results:

  • Up-down chute baffles significantly decreased the L/D cycle period (by 24%) and increased vertical fluid velocity (by 75%) at 30 r/min paddlewheel speed.
  • The probability of achieving a 3s L/D cycle period increased by 52%.
  • Biomass yield increased by approximately 22% without altering paddlewheel speed.

Conclusions:

  • Up-down chute baffles are effective in modifying fluid dynamics to enhance microalgal cultivation.
  • Optimized L/D cycles achieved through baffle implementation lead to significant improvements in biomass yield.
  • CFD is a valuable tool for designing and optimizing algal bioreactor systems.