Table 4 showsthe values used to calculate the specific energy demand and the results of the economic estimation of biodiesel production based on the experimental results for the following extraction conditions: 60 min, 2:1 sludgetohexane volume ratio. As shownin Table 4, theenergy demand and the price per litre of FAMEs depend on the number of extraction stages, varying between 60.95 MJ/kgFAMEs, 1.88 €/LFAMEs (1 stage) and 290.15 MJ/kgFAMEs, 8.94 €/LFAMEs(9 stages). In a continuous process, no more than three extraction stages should be used to gain 99% of lipids. In addition, the scaling-up of the process from lab-scale to industrial plant should reduce the price.