Photobioreactor strategies for improving the CO 2 fixation efficiency of indigenous Scenedesmus obliquus CNW-N: Statistical optimization of CO 2 feeding, illumination, and operation mode

Shih Hsin Ho, Wei Bin Lu, Jo-Shu Chang

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Abstract

Statistical experimental design and bioreactor strategies were applied to enhance CO 2 fixation ability of microalga Scenedesmus obliquus CNW-N. Four operating parameters strongly influencing microalgal CO 2 fixation efficiency (namely, CO 2 concentration, CO 2 flow rate, magnesium concentration, and light intensity) were optimized with response surface methodology. The optimal range of parameters achieving the best overall performance of specific growth rate and CO 2 fixation rate was determined with overlay counter plot techniques. Optimal ranges of CO 2 concentration, CO 2 flow rate, magnesium concentration and light intensity were 2.0-2.5%, 0.3-0.5vvm, 1.7-2.7mM and 180-250μmolm -2s -1, respectively, achieving a specific growth rate of >1.22d -1 and CO 2 fixation rate of >800mgL -1d -1. Semi-batch operations further enhanced the biomass productivity, photosynthesis efficiency, and CO 2 fixation rate to 1030mgL -1d -1, 10.5%, and 1782mgL -1d -1, respectively. This performance is better than the results reported by most related studies.

Original languageEnglish
Pages (from-to)106-113
Number of pages8
JournalBioresource technology
Volume105
DOIs
Publication statusPublished - 2012 Feb 1

Fingerprint

Photobioreactors
Carbon Monoxide
fixation
Magnesium
Lighting
Flow rate
Photosynthesis
Bioreactors
Design of experiments
Biomass
light intensity
Productivity
magnesium
microalga
bioreactor
experimental design
photosynthesis
rate
productivity
biomass

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

Cite this

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title = "Photobioreactor strategies for improving the CO 2 fixation efficiency of indigenous Scenedesmus obliquus CNW-N: Statistical optimization of CO 2 feeding, illumination, and operation mode",
abstract = "Statistical experimental design and bioreactor strategies were applied to enhance CO 2 fixation ability of microalga Scenedesmus obliquus CNW-N. Four operating parameters strongly influencing microalgal CO 2 fixation efficiency (namely, CO 2 concentration, CO 2 flow rate, magnesium concentration, and light intensity) were optimized with response surface methodology. The optimal range of parameters achieving the best overall performance of specific growth rate and CO 2 fixation rate was determined with overlay counter plot techniques. Optimal ranges of CO 2 concentration, CO 2 flow rate, magnesium concentration and light intensity were 2.0-2.5{\%}, 0.3-0.5vvm, 1.7-2.7mM and 180-250μmolm -2s -1, respectively, achieving a specific growth rate of >1.22d -1 and CO 2 fixation rate of >800mgL -1d -1. Semi-batch operations further enhanced the biomass productivity, photosynthesis efficiency, and CO 2 fixation rate to 1030mgL -1d -1, 10.5{\%}, and 1782mgL -1d -1, respectively. This performance is better than the results reported by most related studies.",
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