CO2 sequestration efficiency by spirulina sp. RMUTL

Abstract

Increasing concentrations of CO2 in the atmosphere is causing severe environmental destruction to the earth. Bio-sequestration of CO2 is a promising way to completely sequester CO2 by converting it into biomass by way of photosynthesis. The current research focused on biomass productivity and CO2 sequestration efficiency using microalgae. The experiment choose Spirulina sp. RMUTL by cultivating in working volume 8 liters bioreactor with zarrouk's medium for 24-hrs with light nature and aeration air. The CO2 (100%) was flushed into the medium with a flow rate were 0.01, 0.02 and 0.03 vvm respectively. The period of all experiments were 30 days. The results showed that the maximum specific growth rate, OD560, algae biomass productivity, efficiency of CO2 reduction, CO2 fixation rate and carbon loading rate were 0.35±0.01 d-1, 0.85±0.00, 600.00±10.00 mg.L-1, 96.83±0.76%, 1, 128.00±18.80 mg.L-1.d-1 and 2 0 . 4 1 ±0 . 2 6 g. d-1 with 0.01 vvm CO2 flow rate. The average CO2 sequestration over 30 days were 3.15.±0.03, 3.11.±0.02 and 3.07.±0.07% in 0.01, 0.02 and 0.03 vvm CO2 flow rate respectively.