Energy requirements for wet solvent extraction of lipids from microalgal biomass

Bioresource Technology
Gregory J O Martin

Abstract

Biofuel production from microalgae requires energy efficient processes for extracting and converting triacylglyceride lipids to fuel, compatible with coproduction of protein feeds and nutraceuticals. Wet solvent extraction involves mechanical cell rupture, lipid extraction via solvent contacting, physical phase separation, thermal solvent recovery, and transesterification. A detailed analysis of the effect of key process parameters on the parasitic energy demand of this process was performed. On a well-to-pump basis, between 16% and 320% of the resultant biodiesel energy was consumed depending solely on the process parameters. Highly positive energy balances can be achieved, but only if a correctly designed process is used. This requires processing concentrated biomass (ca 25%w/w) with a high triacylglyceride content (ca 30%w/w), and an efficient extraction process employing a non-polar solvent, low solvent-to-paste ratio, and efficient energy recovery. These requirements preclude many laboratory scale processes and polar co-solvents as viable options for large-scale biofuel production.

References

Apr 24, 2009·Bioresource Technology·Jae-Yon LeeHee-Mock Oh
Sep 22, 2009·Environmental Science & Technology·Laurent LardonOlivier Bernard
Aug 3, 2010·Bioresource Technology·Michael J CooneyRonald Pate
Oct 12, 2010·Bioresource Technology·Carlos ZamalloaWilly Verstraete
Jan 22, 2013·Biotechnology and Bioengineering·Ian L D OlmsteadGregory J O Martin
Oct 2, 2013·Bioresource Technology·Ian L D OlmsteadGregory J O Martin
Jun 10, 2014·Ultrasonics Sonochemistry·Raquel Rezende dos SantosCláudia Maria Luz Lapa Teixeira
Jul 25, 2014·Bioresource Technology·María J Jiménez CallejónEmilio Molina Grima
Dec 2, 2014·Bioresource Technology·Benjamin H J YapGregory J O Martin

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