Kinetics of chlorella sp growth models in reducing CO2 emissions

Abstract

CO2 emissions resulting from human activities are relatively higher concentrations that disrupt the equilibrium system in the air and ultimately damage the environment and human well-being. One environmentally friendly solution for CO2 gas removal is to use microalgae (Chlorella sp.). Chlorella sp. in photobioreactors has the ability to biofixate CO2 gas. Chlorella sp. was chosen because of the most numerous in freshwater and seawater. The purpose of this study was to determine the kinetic model of the effect of adding substrate concentrations and flow rate variations on the growth and development rates of Chlorella sp. due to exposure to pure CO2 gas emissions. This study uses pure CO2 gas with a flow rate of 0.02 L/min, 0.04 L/min, 0.06 L/min, 0.08 L/min, 0.1 L/min and a substrate of 350 mg/L, 500 mg/L, 650 mg/L, 800 mg/L, 950 mg/L on a laboratory scale. The results showed that the most optimum growth rate occurred at the addition of substrate concentrations of 800 mg/L with a flow rate of 0.08 L/min.