Influence of elevated CO2 concentrations on growth, nutrient removal, and CO2 biofixation using Chlorella kessleri cultivation

In this study, the ability of microalgae Chlorella kessleri to remove nutrients, biofix CO 2 , and generate valuable biomass was investigated. For this purpose, CO 2 at different concentrations was added to the synthetic tertiary municipal wastewater for cultivating C. kessleri in batch photobioreac...

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Bibliographic Details
Published in:International journal of environmental science and technology (Tehran) 2021-04, Vol.18 (4), p.913-926
Main Authors: Faruque, M. O., Mohammed, K. A., Hossain, M. M., Razzak, S. A.
Format: Article
Language:English
Subjects:
Aquatic Pollution
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Science and Engineering
Original Paper
Soil Science & Conservation
Waste Water Technology
Water Management
Water Pollution Control
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Summary:In this study, the ability of microalgae Chlorella kessleri to remove nutrients, biofix CO 2 , and generate valuable biomass was investigated. For this purpose, CO 2 at different concentrations was added to the synthetic tertiary municipal wastewater for cultivating C. kessleri in batch photobioreactors. The concentration of biomass increases gradually during the cultivation period for the tested CO 2 concentrations of 2%, 6%, and 10%, except 0% CO 2 . The highest biomass concentration found was 607 mg/L, and the highest biomass productivity is 46 mg/L/day, at a CO 2 concentration of 2%. Monod growth kinetic model based on a single substrate factor was used, and the experimental findings agree well with the predictions by the model for all feed concentrations except 0% CO 2 . Biofixation of CO 2 depends on the optimal CO 2 concentration supplied to the culture. The maximum biofixation rate of CO 2 achieved at 2% CO 2 is 83.88 mg/L/day. The maximum removal of total nitrogen of 99% was achieved for both 2% and 10% CO 2 , while the total nitrogen removal is negligible by microalgae cultured with air without CO 2 enrichment, which confirms the beneficial effect of CO 2 on the removal of nutrients from wastewater media. These findings indicate the possibility of nutrient removal from tertiary municipal wastewater using microalgae C. kessleri along with CO 2 biofixation.
ISSN:1735-1472
1735-2630
DOI:10.1007/s13762-020-02909-4