Life Cycle Analysis on Fossil Energy Ratio of Algal Biodiesel: Effects of Nitrogen Deficiency and Oil Extraction Technology

Table 1

Productivity and cell composition of algae grown under N-sufficient and N-limited conditions.

Strains	Normal N supply				Limited N supply (50% of normal N supply)
	Protein/%	Carbonhydrate/%	Lipid/%	Productivity/g/m^2·d	Protein/%	Carbonhydrate/%	Lipid/%	Productivity/g/m^2·d
Phaeodactylum tricornutum^b	32.2	18.5	28.46	25	24.76	16.7	31.8	15.45
Chlorella vulgaris^c	31	51	18	22	6	54	40	19.85

Source: [9, 21]. ^cSource: [11, 22].