The Effects of Total Dissolved Carbon Dioxide on the Growth Rate, Biochemical Composition, and Biomass Productivity of Nonaxenic Microalgal Polyculture

Lenin C. Kandasamy, Marcos A. Neves, Mikihide Demura and Mitsutoshi Nakajima
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Lenin C. Kandasamy: Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
Marcos A. Neves: Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan
Mikihide Demura: Applied Biochemistry and Food Science Course, Department of Bioresource Sciences, Faculty of Agriculture, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
Mitsutoshi Nakajima: Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan

Sustainability, 2021, vol. 13, issue 4, 1-10

Abstract: The biosequestration of CO 2 using microalgae has emerged as a promising means of recycling CO 2 into biomass via photosynthesis, which could be used to produce biofuels as an attractive approach to CO 2 mitigation. We investigated the CO 2 fixation capability of the native nonaxenic microalgal culture using a 2 L photobioreactor operated in batch mode. The cultivation was carried out at varying concentrations of total dissolved CO 2 (Tco 2 ) in the bulk media ranging from 200 to 1000 mg L −1, and the temperature and light intensities were kept constant. A maximum CO 2 fixation rate was observed at 400 mg L −1 of Tco 2 . Characteristic growth parameters such as biomass productivity, specific growth rate, maximum biomass yield, and biochemical parameters such as carbohydrate, protein, and lipids were determined and discussed. We observed that the effect of CO 2 concentration on growth and biochemical composition was quite significant. The maximum biomass productivity was 22.10 ± 0.70 mg L −1 day −1 , and the rate of CO 2 fixation was 28.85 ± 3.00 mg L −1 day −1 at 400 mg L −1 of Tco 2 . The maximum carbohydrate (8.17 ± 0.49% dry cell weight) and protein (30.41 ± 0.65%) contents were observed at 400 mg L −1 , whereas the lipid content (56.00 ± 0.82% dry cell weight) was the maximum at 800 mg L −1 of Tco 2 in the bulk medium.

Keywords: nonaxenic culture; biomass productivity; polyculture; carbon dioxide; CO 2 biosequestration; microalgae (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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