Batch Growth of Chlorella Vulgaris CCALA 896 versus Semi-Continuous Regimen for Enhancing Oil-Rich Biomass Productivity

Energies

Sigita Vaičiulytė¹  Giulia Padovani²  Jolanta Kostkevičienė¹ 

[1] Department of Botany and Genetics, Faculty of Natural Sciences, Vilnius University, M.K.Ciurlionio 21/27, Vilnius LT-03101, Lithuania; E-Mails:;Institute of Ecosystem Study, National Research Council (CNR), Section of Florence, Polo Scientifico, Via Madonna del Piano n. 10, Sesto Fiorentino (FI) IT-50019, Italy; E-Mail:

关键词: Chlorella vulgaris;    indoor photobioreactors;    nitrogen/phosphorus starvation;    biomass productivity;    oil-rich biomass;   

DOI  :  10.3390/en7063840

来源: mdpi

【 摘 要 】

The aim of this study was to induce lipid accumulation in Chlorella cells by creating stressful growth conditions. Chlorella vulgaris CCALA 896 was grown under various batch growth modes in basal and modified BG-11 and Kolkwitz culture broths, using a continuous light regimen of 150 µE/m²/s, at 30 °C. In order to perform the experiments, two indoor photobioreactor shapes were used: a cylindrical glass photobioreactor (C_GPBR) with a working volume of 350 mL, and a flat glass photobioreactor (F_GPBR) with a working volume of 550 mL. Stress-eliciting conditions, such as nitrogen and phosphorous starvation, were imposed in order to induce lipid accumulation. The results demonstrated that more than 56% of the lipids can be accumulated in Chlorella biomass grown under two-phase batch growth conditions. The highest biomass productivity of 0.30 g/L/d was obtained at the highest nominal dilution rate (0.167 day⁻¹) during a semi-continuous regimen, using a modified Kolkwitz medium. During the pH-stress cycles, the amount of lipids did not increase significantly and a flocculation of Chlorella cells was noted.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.