1. Application of a microalga, Tetradesmus obliquus PF3, for NO and CO2 removal from actual flue gas via cultivating in wastewater.
- Author
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Ma, Shanshan, Yu, Yanling, Li, Dianlin, Cui, Hao, and Feng, Yujie
- Subjects
SEWAGE ,SEWAGE disposal plants ,GREENHOUSE gas mitigation ,POLLUTANTS ,GREENHOUSE gases - Abstract
Greenhouse gas (GHG) emissions, particularly anthropogenic emissions, are the primary drivers of climate change. The cultivation of microalgae represents a highly promising strategy for mitigating atmospheric GHG levels. The growth characteristics and GHG mitigation capabilities of Tetradesmus obliquus PF3 were investigated in domestic wastewater at a thermal power plant. The maximum cell density and productivity were 1.52 ± 0.01 g L
−1 and 0.33 ± 0.01 g L−1 day−1 , respectively. Utilizing a serial configuration of two reactors, the elimination efficiency of NO and CO2 attained values of 78 ± 4% and 14 ± 4%, respectively. NO concentration at the outlet was less than 24.6 ± 2.9 mg m−3 , meeting the latest Chinese discharge limits. Besides, the recovery efficiency of NO and CO2 increased to 77 ± 8% and 2.24 ± 0.04%, respectively, compared to that of the single reactor (40 ± 3%, 0.9 ± 0.0%). A removal efficiency of over 90% was achieved for TN and TP in domestic wastewater. The concentrations of COD (76.5 mg L−1 ), NH4 + -N (0.9 mg L−1 ), TN(6.31 mg L−1 ), and TP (0.35 mg L−1 ) in effluent were below the thresholds of 100 mg L−1 , 25 mg L−1 , none data, and 3 mg L−1 , respectively, complying with the Chinese Discharge Standard (Class II criteria set forth) for Municipal Wastewater Treatment Plants Pollutants. The harvested biomass exhibited a high content of carbohydrates and proteins, making it a viable feedstock for biofuels and bio-fertilizers. Our results demonstrate that Tetradesmus obliquus PF3–based flue gas treatment technology can simultaneously realize GHG removal, wastewater bio-remediation, and biomass recovery. [ABSTRACT FROM AUTHOR]- Published
- 2024
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