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Environ Sci Pollut Res Int. 2018 Jul;25(19):18519-18527. doi: 10.1007/s11356-018-1926-1. Epub 2018 Apr 26.

Exploring an in situ LED-illuminated isothermal micro-calorimetric method to investigating the thermodynamic behavior of Chlorella vulgaris during CO2 bio-fixation.

Author information

1
School of Food and Environment, Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Dalian University of Technology, Panjin, 124221, Liaoning, People's Republic of China. mrussel@dlut.edu.cn.
2
School of Food and Environment, Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Dalian University of Technology, Panjin, 124221, Liaoning, People's Republic of China.
3
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, No. 2, Nengyuan Road, Tianhe District, Guangzhou, 510640, Guangdong, People's Republic of China.
4
School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing, 100083, People's Republic of China.
5
School of Water Resource and Environmental Engineering, Sino-Hungarian Joint Laboratory of Environmental Science and Health, Chinese University of Geosciences (Beijing), Beijing, 100083, People's Republic of China.
6
School of Environment and Energy, Peking University-Shenzhen Graduate School, Shenzhen, 518055, People's Republic of China.

Abstract

Much endeavor has been dispensed recently to evaluate the potential of CO2 mitigation by microalgae. We introduce an alternative, novel, LED-illumination isothermal microcalorimetric method to assess the thermodynamic behaviors of microalgae for better understanding of their carbon sequestration capacity. Microalgae thermodynamic behaviors were recorded as power-time curves, and their indices such as total heat evolution (QT), maximum power output (Pmax) and heat generated by per algae cell (JN/Q) were obtained. The values for highest (74.80 g L-1) and control sample (0.00 g L-1) of QT, Pmax and JN/Q were 20.85 and 2.32 J; 252.17 and 57.67 μW; 7.91 × -06 and 8.80 × -07 J cell-1, respectively. According to the values of QT, a general order to promote the CO2 sequestration was found at 74.8 g L-1 > 29.92 g L-1 > 14.96 g L-1 > 7.48 g L-1 > 0 g L-1 of C sources, which directly corresponded to carbon availability in the growth medium. Chlorella vulgaris GIEC-179 showed the highest peak Pmax at 74.8 g L-1 concentration which was directly transformed to their biomass during bio-fixation of CO2 process. This study is applicable for better understanding of CO2 fixation performance of algae.

KEYWORDS:

Biomass concentration; Carbon dioxide bio-fixation; Isothermal microcalorimeter; Microalgae; Thermodynamic properties

PMID:
29700746
DOI:
10.1007/s11356-018-1926-1
[Indexed for MEDLINE]

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