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Using polyethylene glycol to promote Nannochloropsis oceanica growth with 15 vol% CO 2 .
- Source :
-
The Science of the total environment [Sci Total Environ] 2020 Jun 10; Vol. 720, pp. 137598. Date of Electronic Publication: 2020 Feb 26. - Publication Year :
- 2020
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Abstract
- CO <subscript>2</subscript> capture with microalgae has been put forward in response to global concern on greenhouse gas emission. However, the short residence time and slow diffusion of CO <subscript>2</subscript> in water limits the growth of microalgae. In order to improve CO <subscript>2</subscript> transfer from gas phase to liquid phase and utilization by algal cells, polyethylene glycol 200 (PEG 200) was used as CO <subscript>2</subscript> absorbent to promote growth of Nannochloropsis oceanica with the bubbling of 15 vol% CO <subscript>2</subscript> . Total inorganic carbon (TIC) absorbed in culture medium remained constant at 5.6 mM when 15 vol% CO <subscript>2</subscript> was bubbled continuously. PEG 200 in the medium provided additional CO <subscript>2</subscript> absorption from 0.6 to 4.8 mM when PEG 200 concentration increased from 0.5 to 4 mM. The specific growth rate of N. oceanica reached the maximum (1.41 d <superscript>-1</superscript> ) with 1 mM PEG 200 in culture medium, which was 21.5% higher than the specific growth rate without PEG 200. About 79% of the increase in biomass was attributed to the increased TIC with more CO <subscript>2</subscript> dissolution in culture medium because of PEG 200, and about 21% was attributed to PEG 200 itself utilized as an organic carbon source. In conclusion, PEG 200 as a CO <subscript>2</subscript> absorbent can effectively capture flue-gas CO <subscript>2</subscript> for algal growth.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2020 Elsevier B.V. All rights reserved.)
- Subjects :
- Biomass
Carbon Dioxide
Polyethylene Glycols
Microalgae
Stramenopiles
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1026
- Volume :
- 720
- Database :
- MEDLINE
- Journal :
- The Science of the total environment
- Publication Type :
- Academic Journal
- Accession number :
- 32143052
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2020.137598