Effect of different environmental conditions on optimal cell density, biomass production, lipid and biodiesel production in Desmodesmus microalgae

Subject Areas : Genetic

Mohammad Niazkhani ¹ , Ahmad Mohammadi ² , Hamid Mashhadi ³ , Fahimeh Mahmoudnia ⁴

1 - Department of Bio-system Engineering in Renewable Energy, Arak branch, Islamic Azad University, Arak, Iran,
2 - Department of Bio-system Engineering in Renewable Energy, Arak branch, Islamic Azad University, Arak, Iran,
3 - Department of Bio-system Engineering in Renewable Energy, Arak branch, Islamic Azad University, Arak, Iran,
4 - Scientific member of Shahid Beheshti university, Qom, Iran,

Received: 2021-12-11 Accepted : 2022-02-28 Published : 2022-12-22

Keywords: Salinity, pH, temperature, biofuel, radiation intensity,

Abstract :

Microalgae are diverse group of simple organisms, which are incorporated in pharmaceutical, cosmic, nutritional and biodiesel productions. The amount of growth in microalgae is affected by physical and chemical conditions of growth environment. In commercial scale in order to achieve highest amount of biomass or biodiesel, it is necessary to use culture media with proper combination of materials. Therefore, in this study, effects of different values of temperature, light intensity, lighting period, saltiness and pH were tested by their effect on cell concentration, biomass, lipid and biodiesel production in desmodesmus microalgae. As a result, the best temperature for increase in cell concentration of microalgae was 25 degree of Celsius,  light intensity of 4500 lux, light period of 17 hours, saltiness of 5 ppm and pH of 8. The highest amount of biomass was achieved in light intensity of 3000 lux, 18 hours of lighting, saltiness of 5 ppm and pH of 9. The highest amount of lipid was produced at temperature of 26, light intensity of 4200 lux, lighting period of 16 hours, saltiness of 12 and pH of 9. Finally, the highest amount of biodiesel was produced at temperature of 26, light intensity of 4200, lighting period of  16 hours, saltiness of 11 and pH of 9.

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