Parametric analysis of chlorella microalgae cultivation process and mathematical modeling of intensive growth process

¹ Tashkent Institute of Irrigation and Agricultural Mechanization Engineers National Research University, 100000, Tashkent, Uzbekistan
² Termez State University, Termez, Uzbekistan

^* Corresponding author: raxmanovsherqul@gmail.com

Abstract

In this paper, based on the analysis of the parameters of the technological process of growing Chlorella microalgae, the construction of its mathematical model and its main parameters obtained in the experiments carried out in intensive growth processes were considered and analyzed within the framework of the influence on the increase of biomass. A structural scheme for the intensive cultivation of Chlorella microalgae has been developed. A kinetic and mathematical model representing the dependence of the growth time of the biomass of Chlorella microalgae was obtained based on the experiments. In the experiment, it was found that the change of the kinetic curve corresponds to the Verhulst logistic equation for limited population growth. The equation of the state of consumption of nutrients in the periodic cultivation of Chlorella microalgae was determined, and based on the kinetic model of this process, a mathematical model was developed. When the biomass x concentration of Chlorella microalgae reaches the maximum value Ep, growth stops. In this case, it was proved on the basis of experiments that the increase in the amount of lipids formed in the biomass stops. The relationship between the increase in the concentration of the C substrate and the increase in biomass was confirmed by Andrew's equation. In the process of cultivation of chlorella microalgae, the composition of the most optimized nutrient medium was determined, taking into account the proportions of the proposed macro and micronutrients. It was found that the maximum concentration of chloella microalgae cells from the optimized nutrient medium is 10-15% higher than the maximum concentration in the Tamiya nutrient medium, and the cost of one cubic meter of the proposed nutrient medium is 2 times lower than the Tamiya medium.