Sugar-stimulated CO2 sequestration by the green microalga Chlorella vulgaris

Weiqi Fu, Steinn Gudmundsson, Kristine Wichuk, Sirus Palsson, Bernhard O. Palsson, Kourosh Salehi-Ashtiani, Sigurður Brynjólfsson

    Research output: Contribution to journalArticle

    Abstract

    To convert waste CO2 from flue gases of power plants into value-added products, bio-mitigation technologies show promise. In this study, we cultivated a fast-growing species of green microalgae, Chlorella vulgaris, in different sizes of photobioreactors (PBRs) and developed a strategy using small doses of sugars for enhancing CO2 sequestration under light-emitting diode illumination. Glucose supplementation at low levels resulted in an increase of photoautotrophic growth-driven biomass generation as well as CO2 capture by 10% and its enhancement corresponded to an increase of supplied photon flux. The utilization of urea instead of nitrate as the sole nitrogen source increased photoautotrophic growth by 14%, but change of nitrogen source didn't compromise glucose-induced enhancement of photoautotrophic growth. The optimized biomass productivity achieved was 30.4% higher than the initial productivity of purely photoautotrophic culture. The major pigments in the obtained algal biomass were found comparable to its photoautotrophic counterpart and a high neutral lipids productivity of 516.6 mg/(L·day) was achieved after optimization. A techno-economic model was also developed, indicating that LED-based PBRs represent a feasible strategy for converting CO2 into value-added algal biomass.

    Original languageEnglish (US)
    Pages (from-to)275-283
    Number of pages9
    JournalScience of the Total Environment
    Volume654
    DOIs
    StatePublished - Mar 1 2019

    Fingerprint

    microalga
    Sugars
    carbon sequestration
    sugar
    Biomass
    Photobioreactors
    Productivity
    biomass
    productivity
    Light emitting diodes
    Glucose
    glucose
    Nitrogen
    nitrogen
    Biotechnology
    Flue gases
    Pigments
    Urea
    Nitrates
    Lipids

    Keywords

    • Chlorella vulgaris
    • CO capture
    • Fine-tuned mixotrophic growth
    • LED illumination
    • Microalga

    ASJC Scopus subject areas

    • Environmental Engineering
    • Environmental Chemistry
    • Waste Management and Disposal
    • Pollution

    Cite this

    Fu, W., Gudmundsson, S., Wichuk, K., Palsson, S., Palsson, B. O., Salehi-Ashtiani, K., & Brynjólfsson, S. (2019). Sugar-stimulated CO2 sequestration by the green microalga Chlorella vulgaris. Science of the Total Environment, 654, 275-283. https://doi.org/10.1016/j.scitotenv.2018.11.120

    Sugar-stimulated CO2 sequestration by the green microalga Chlorella vulgaris. / Fu, Weiqi; Gudmundsson, Steinn; Wichuk, Kristine; Palsson, Sirus; Palsson, Bernhard O.; Salehi-Ashtiani, Kourosh; Brynjólfsson, Sigurður.

    In: Science of the Total Environment, Vol. 654, 01.03.2019, p. 275-283.

    Research output: Contribution to journalArticle

    Fu, W, Gudmundsson, S, Wichuk, K, Palsson, S, Palsson, BO, Salehi-Ashtiani, K & Brynjólfsson, S 2019, 'Sugar-stimulated CO2 sequestration by the green microalga Chlorella vulgaris', Science of the Total Environment, vol. 654, pp. 275-283. https://doi.org/10.1016/j.scitotenv.2018.11.120
    Fu W, Gudmundsson S, Wichuk K, Palsson S, Palsson BO, Salehi-Ashtiani K et al. Sugar-stimulated CO2 sequestration by the green microalga Chlorella vulgaris. Science of the Total Environment. 2019 Mar 1;654:275-283. https://doi.org/10.1016/j.scitotenv.2018.11.120
    Fu, Weiqi ; Gudmundsson, Steinn ; Wichuk, Kristine ; Palsson, Sirus ; Palsson, Bernhard O. ; Salehi-Ashtiani, Kourosh ; Brynjólfsson, Sigurður. / Sugar-stimulated CO2 sequestration by the green microalga Chlorella vulgaris. In: Science of the Total Environment. 2019 ; Vol. 654. pp. 275-283.
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