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

Table 4

Energy consumptions and efficiency for algal oil extraction.

	Extraction from dried algae^i	Extraction from wet algae^j
Power (kWh/t algae)	25	26.46
Steam (MJ/t algae)	1170.8	1239.01
Efficiency (%)	97.5	90

The energy demands for extraction of oil from dried algae are from SEPA (State Environmental Protection Administration of China) of China [30].
^jThe energy demands for extraction of oil wet algae are based on a pilot-scale operation of algal oil extraction plant in China.