Comparison of heterotrophic and mixotrophic Chlorella pyrenoidosa cultivation for the growth and lipid accumulation through acetic acid as a carbon source
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING(2022)
摘要
In order to overcome the bottleneck of the high cost of microalgae biodiesel production, biomass and lipid accumulation of microalga Chlorella pyrenoidosa feeding on the low-cost carbon source, acetic acid (AcA), were investigated. The results showed that C. pyrenoidosa had the ability of mixotrophy and heterotrophy, which could tolerate 50 g/L of AcA in the heterotrophy with the biomass concentration of 137.89 +/- 2.03 mg/L. Under heterotrophic condition, the biomass productivity at logarithmic stage was positively correlated with the AcA dosage, and the maximum biomass productivity of 187.26 +/- 3.61 mg/L/d was obtained at 10 g/L of AcA. Four AcA concentrations (6, 10, 20 and 30 g/L) were set to evaluate the effects of AcA on the growth and lipid accumulation of C. pyrenoidosa under heterotrophic and mixotrophic conditions. Heterotrophic mode at 10 g/L of AcA was demonstrated to be the most potential condition with the maximum biomass productivity of 134.91 +/- 5.74 mg/L/d and the highest lipid productivity of 42.04 +/- 0.21 mg/L/d, and the lipid production (44.03 +/- 2.84 mg/L) was 15-fold higher than the control of BG-11 medium. In addition, C. pyrenoidosa achieved the highest nutrient removal efficiency (30.0% and 85.9% for total nitrogen and phosphorus, respectively) and the highest AcA assimilation efficiency (74.1%). This study highlighted a promising win-win method of AcA recycling and microalgae-based biodiesel production.
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关键词
Chlorella pyrenoidosa, Acetic acid, Mixotrophic/Heterotrophic cultivation, N, P removal, Lipid
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