TY - JOUR
T1 - Optimization of CO2 concentration and light intensity for biodiesel production by Chlorella vulgaris FACHB-1072 under nitrogen deficiency with phosphorus luxury uptake
AU - Chu, Fei Fei
AU - Shen, Xiao Fei
AU - Lam, Paul K.S.
AU - Zeng, Raymond J.
N1 - Funding Information:
Acknowledgments The authors would like to acknowledge the financial support of the Hundred-Talent Program of CAS and the Program for Changjiang Scholars and Innovative Research Team in University.
PY - 2014/8
Y1 - 2014/8
N2 - Microalgal biodiesel is an alternative bioenergy for the future. Nitrogen deprivation is usually used to increase lipid content in microalgae, however, it also lowers biomass production, resulting in not much increase of lipid productivity. Our previous study found that phosphorus played an important role in enhancing biodiesel productivity of C. vulgaris FACHB-1072 under nitrogen deficient condition. The aim of this study was to optimize two significant parameters of CO2 concentration (0.03, 4, 6, 12 %) and light intensity (40, 120, 200 μmol photons m-2 s-1) with respect to biodiesel productivity and P uptake rate of C. vulgaris FACHB-1072. It was found that the optimized conditions were 4 % CO2 concentration and 200 μmol photons m-2 s-1 light intensity. The maximum biodiesel productivity was 34.56 mg L-1 day-1; 2.7 times higher than the control (nutrient sufficient condition). Phosphorus was accumulated as polyphosphate and its maximum uptake rate was 2.08 mg L-1 day-1; twice that of the control. After optimization, the performances under nitrogen deficiency were significantly better compared with those under nitrogen sufficiency, which were rarely reported in literature. Our findings suggest a great potential to combine phosphorus removal from wastewater with biodiesel production via microalgae.
AB - Microalgal biodiesel is an alternative bioenergy for the future. Nitrogen deprivation is usually used to increase lipid content in microalgae, however, it also lowers biomass production, resulting in not much increase of lipid productivity. Our previous study found that phosphorus played an important role in enhancing biodiesel productivity of C. vulgaris FACHB-1072 under nitrogen deficient condition. The aim of this study was to optimize two significant parameters of CO2 concentration (0.03, 4, 6, 12 %) and light intensity (40, 120, 200 μmol photons m-2 s-1) with respect to biodiesel productivity and P uptake rate of C. vulgaris FACHB-1072. It was found that the optimized conditions were 4 % CO2 concentration and 200 μmol photons m-2 s-1 light intensity. The maximum biodiesel productivity was 34.56 mg L-1 day-1; 2.7 times higher than the control (nutrient sufficient condition). Phosphorus was accumulated as polyphosphate and its maximum uptake rate was 2.08 mg L-1 day-1; twice that of the control. After optimization, the performances under nitrogen deficiency were significantly better compared with those under nitrogen sufficiency, which were rarely reported in literature. Our findings suggest a great potential to combine phosphorus removal from wastewater with biodiesel production via microalgae.
KW - Biodiesel production
KW - Chlorella vulgaris FACHB-1072
KW - Light intensity
KW - Nitrogen deficiency
KW - Phosphorus uptake
UR - http://www.scopus.com/inward/record.url?scp=84905395242&partnerID=8YFLogxK
U2 - 10.1007/s10811-013-0200-7
DO - 10.1007/s10811-013-0200-7
M3 - Article
AN - SCOPUS:84905395242
SN - 0921-8971
VL - 26
SP - 1631
EP - 1638
JO - Journal of Applied Phycology
JF - Journal of Applied Phycology
IS - 4
ER -