Abstract
As a promising feedstock for biodiesel production, the oleaginous microalgae have attracted the attention worldwide. The effects of temperature on the growth, lipid accumulation and nutrient removal characteristics of a freshwater microalga Chlorella sp. HQ were evaluated. The results show that it could grow in a wide range of temperature between 12 and 25°C, but hardly grow at extremely high temperature of 38°C. After 15 d of batch cultivation, the algal biomass was in the range of 68.8 ± 15.9–176.7 ± 13.8 mg L−1 and the peak was obtained at 18°C. The lipid content per algal biomass decreased linearly from 41.8 to 6.9% as the temperature rose from 12 to 25°C. The lipid yields at 12 and 18°C were almost the same (around 23.8 mg L−1), and at 25°C, the lipid yield was remarkably lower (8.8 ± 1.8 mg L−1). The highest TAGs content (10.2 ± 1.1%) was obtained at 25°C, and the TAGs yields were ranging from 0.53 ± 0.15 to 0.89 ± 0.13 mg L−1. In the range of 18–25°C, water nitrogen (N) (up to 94.9 ± 0.3%) and phosphorus (P) (up to 99.0 ± 1.7%) were removed efficiently. Through comprehensive analysis, the optimal temperature for Chlorella sp. HQ to produce biodiesel and purify wastewater is suggested in the range of 18 and 25°C.
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