CO₂ bio-sequestration by Chlorella vulgaris and Spirulina platensis in response to different levels of salinity and CO₂

摘要

The limitation of fresh water and the exorbitant cost of land to grow such plants, algae are the most optimumorganisms for CO2 bio-sequestration and also microalgae cultures avail many characteristics that make them anarguable option for higher productivities as compared to higher plants. The aim of this study was thesequestrate CO2 by Spirulina platensis and Chlorella vulgaris under the different levels of salinity and CO2.The highest growth rate obtained during the first 4 days and higher biomass concentration at CO2 concentrationfrom0.03% to 10% respectively. The significant (p<0.05) biomass productivity, growth rate and CO2sequestration rate under different level of CO2 and EC between Spirulina platensis and Chlorella vulgariswere detected. The ultimate CO2 sequestration rate of Spirulina platensis and Chlorella vulgaris were 0.49 and0.152 g/L/d in natural water respectively, although in artificial sea water 0.419 and 0.097 g/L/d were recordedat 10% CO2 concentrations respectively.