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Environ Sci Pollut Res Int. 2019 Sep 11. doi: 10.1007/s11356-019-06287-4. [Epub ahead of print]

Effects of carbon concentration, pH, and bubbling depth on carbon dioxide absorption ratio in microalgae medium.

Yin D1,2, Wang Z1,3, Wen X1,3, Ding Y1,3, Hou X1,4, Geng Y1,3, Li Y5,6.

Author information

1
Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, People's Republic of China.
2
Hubei Key Laboratory of Water Resources and Ecological Environment, Yangtze River Scientific Research Institute, Wuhan, 430010, People's Republic of China.
3
The Innovative Academy of Seed Design, Chinese Academy of Sciences, Wuhan, 430074, People's Republic of China.
4
University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
5
Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, People's Republic of China. yeguang@wbgcas.cn.
6
The Innovative Academy of Seed Design, Chinese Academy of Sciences, Wuhan, 430074, People's Republic of China. yeguang@wbgcas.cn.

Abstract

The microalgae-based CO2 sequestration is considered to be an effective technique with great potential to cope with carbon emission. However, most researches are only focused on microalgae; the effects of physicochemical factors, which are carbon concentration, medium pH, and bubbling depth, on absorption and utilization of supplied CO2 in culture is less known. In order to understand and improve CO2 absorption in microalgae culture, the effects of these three factors were studied with different levels and combinations. Results revealed that when medium carbon concentration increased from 4.76 to 95.24 mmol/L, CO2 absorption ratio increased by about 12%, 10%, 12%, and 11% at medium depths of 10, 20, 40, and 80 cm, with the initial pH 10.6 to 9.7 by bubbling CO2, respectively. As bubbling depth increased from 10 to 80 cm, CO2 absorption ratio increased by about 25%, 22%, and 25% at carbon concentrations of 4.76, 9.52, and 95.24 mmol/L, with the initial pH 10.6 to 9.7 by bubbling CO2, respectively. In range of 10.6-7.0, pH had no significant effect on CO2 absorption ratio (P > 0.05) when carbon concentration is below 9.52 mmol/L, while above 9.52 mmol/L, pH had significant effect on CO2 absorption ratio (P < 0.05). It was found for the first time that the effect of pH on the CO2 absorption ratio was affected by carbon concentration. In addition, equilibrium pH, at which the CO2 partial pressure in the medium equals to that in the air, of medium with different carbon concentrations was also determined. Overall, in microalgae culture for CO2 sequestration, increasing CO2 bubbling depth and keeping higher carbon concentration and higher pH can improve CO2 absorption ratio, which will optimize the biofixation of CO2 by microalgae furthermore.

KEYWORDS:

Absorption ratio; Bubbling depth; Carbon concentration; Carbon dioxide; Microalgae; pH

PMID:
31512136
DOI:
10.1007/s11356-019-06287-4

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