CO2 Mitigation by Algae
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Abstract
The increasing of atmospheric carbon dioxide (CO2), one of the greenhouse gases, is a global critical environmental issue. The objective of this research was to study the efficiency of CO2 reduction using 3 algae strains (Chlorella sp., Spirulina sp. and Scenedesmus sp.). The three strains were cultivated in 5liter photobioreactor under the light intensity of 4,000 lux. They were continuously sparged with CO2 (99%) at a flow rate of 0.05 vvm for 20 days. The results found that Chlorella sp. expressed the highest efficiency with the maximum specific growth rate, cell density (OD560), biomass productivity, efficiency of CO2 reduction and CO2 fixation rate of 0.43±0.05 d-1, 0.62±0.02, 2,166.70±57.70 mg.l-1., 97.33±0.58%, and 4,073.30±108.50 mg.l-1.d-1 , respectively. The average CO2 sequestration obtained in 20 days was 3.88±0.01 mole. In addition, the efficiency of CO2 reduction and CO2 sequestration were significantly different (p<0.05).
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