Biomedical Engineering Reference
In-Depth Information
TABLE 7.2
Comparison of different oil extraction methods
Supercritical
Fluid
Extraction
S.
No.
Mechanical
Pressing
Solvent
Extraction
Parameters
Ref.
1
Algae form
Dry
Dry
Dry
Sahena, 2009; Singh and Sai,
2011; de Boer et al., 2012
2
Pretreatment
to algae
biomass for
cell rupture
Required to
improve
lipid
extraction
efficiency
Required to
improve
lipid
extraction
efficiency
Not required
Cooney et al., 2009; Sahena
et al., 2009; Mercer and
Armenta, 2011; de Boer
et al., 2012
3
Solvent used
No solvent
Hexane
Supercritical
CO 2
Popoola and Yangomodou,
2006;
Cooney et al., 2009;
Demirbas, 2009
4
Working fluid
Not
applicable
Toxic
Nontoxic
Mercer and Armenta, 2011
5
Oil recovery
(%)
70-75
96
100
Demirbas, 2009;
Popoola and Yangomodou,
2006; Demirbas and
Demirbas, 2010
6
Purity of oil
NA
Both polar
and
nonpolar
and colors
Only
nonpolar
and colors
Cooney et al., 2009; Mercer
and Armenta, 2011
7
Energy
consumption
Low
High
High
Macias-Sanchez et al., 2005;
Cooney et al., 2009; Mercer
and Armenta, 2011; de Boer
et al, 2012
Capital
investment
Low
High
High
Mercer and Armenta, 2011
8
Recycling
unit
Nil
Necessary
for reuse
Necessary
for reuse
9
Scaling up
Possible
Possible
Difficult at
this time
Pawliszyn, 1993;
Macias-Sanchez et al., 2005;
Mercer and Armenta, 2011
extraction and reused again for further extractions. A comparison of three different
oil extraction methods used for lipid recovery is provided in Table 7.2.
7.4 CONCLUSION
Microalgae are becoming more attractive feedstocks for biodiesel production
as higher oil-yielding algae have the potential to replace conventional biodiesel
feedstocks. The viability of microalgae oil-based biodiesel production primarily
 
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