Háskóli ÍslandsUniversity of IcelandFu, WeiqiGuðmundsson, SteinnWichuk, KristinePalsson, SirusPálsson, Bernhard ÖSalehi-Ashtiani, KouroshBrynjolfsson, Sigurdur2018-11-192018-11-192019-03Fu, 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. doi:https://doi.org/10.1016/j.scitotenv.2018.11.1200048-96971879-1026 (eISSN)https://hdl.handle.net/20.500.11815/905Post-print (lokagerð höfundar) opið á: https://systemsbiology.hi.is/wp-content/uploads/2018/11/Sugar-stimulated-CO2-sequestration-by-the-green-microalga-Chlorella-vulgaris-draft.pdfTo 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.275-283eninfo:eu-repo/semantics/embargoedAccessEnvironmental EngineeringWaste Management and DisposalPollutionEnvironmental ChemistryChlorella vulgarisCO2 captureMicroalgaUmhverfisverkfræðiÚrgangurMengunKoltvíoxíðGrænþörungarinfo:eu-repo/semantics/articleScience of The Total Environment10.1016/j.scitotenv.2018.11.120