Effect of CO₂ supply conditions on lipid production of Chlorella vulgaris from enzymatic hydrolysates of lipid-extracted microalgal biomass residues
2012
Zheng, Hongli | Gao, Zhen | Yin, Fengwei | Ji, Xiaojun | Huang, He
The hydrolysates from lipid-extracted microalgal biomass residues (LMBRs) were used as a source of nutrients for the cultivation of Chlorella vulgaris for lipid production under various CO₂ supply conditions, including different CO₂ concentrations and aeration rates. Both parameters had a significant effect on lipid production. A CO₂ concentration of 5% was found to be most suitable for microalgal growth. Microalga grew best at a CO₂ aeration rate of 0.5vvm. At this rate, biomass concentration and lipid productivity were at a maximum of 3.83gL⁻¹ and 157mg L⁻¹d⁻¹, respectively, but decreased at lower or higher aeration rates. The present results showed that LMBRs utilization was effective in microalgal lipid production under suitable CO₂ supply conditions.
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