Nombre: VINÍCIUS MOLINI BENEDITO
Tipo: MSc dissertation
Fecha de publicación: 07/02/2020
Supervisor:
Nombre |
Rol |
|---|---|
| PAULO SÉRGIO DA SILVA PORTO | Co-advisor * |
| RODRIGO RANDOW DE FREITAS | Advisor * |
Junta de examinadores:
| Nombre |
Rol |
|---|---|
| LAIANE ALVES DE ANDRADE | External Examiner * |
| PAULO SÉRGIO DA SILVA PORTO | Co advisor * |
| RODRIGO RANDOW DE FREITAS | Advisor * |
| TAISA SHIMOSAKAI DE LIRA | Internal Examiner * |
Resumen: The use of microalgae in the field of renewable energy is receiving great attention
today due to the huge worldwide demand for sustainable energy sources, due to
its high photosynthetic yield, leading to high biomass production and high lipid
content. However, for the biodiesel produced to reach competitive values in the
market, there are still many technological challenges, especially regarding the
cost reduction in the microalgal cultivation stages. For example, significant cost
reductions would be obtained if nutrients could be obtained more affordably from
a financial and environmental point of view while maintaining optimal cultivation
conditions. Thus, the present study aims to analyze a cultivation of microalgae of
the species Nannochloropsis oculate, using struvite as nutrient, and also to obtain
microalgal growth models under different light conditions. The studied models
described satisfactorily the growth of biomass for the conditions of luminosity
24_h light: 00_dark and 12_h light: 12_h dark, with correlation coefficients from
0.999 to 0.991. Stephanopoulos model showed the least deviations from the
experimental data. Mathematical modeling and experimental data showed the
luminous condition 12_h light: 12_h dark optimizes the values of cell density
(241.527x104 cells.mL-1) and bio-oil content (20.019%), still generating a
reduction of 0.56 KWh for each liter of cultivation. The analysis of 23 factorial
design, using struvite as nutrient in different proportions, showed the potential of
using struvite as a source of phosphorus in microalgae cultivation and its bio-oil
has similar characteristics to that obtained by conventional nutrients.
Key words: microalgae, bio-oil, modeling, Nannochloropsis oculata.
