Hydrothermal Liquefaction of Valuables-Extracted Microalgae with Help of Pulsed Electric Field Treatment
Guo, B., Yang, B., Silve, A., Akaberi, S., Scherer, D., Papachristou, I., Frey, W., Hornung, U., Dahmen, N.
Extraction of high value product from microalgae and utilization of the residual biomass for biofuel production promise to bring economical benefits for a microalgae biorefinery. Recently, pulsed electric field (PEF) treatment has gained much attention to easier facilitate the extraction of valuables from microalgae. For conversion of microalgae biomass and residues, hydrothermal liquefaction (HTL) is considered as a suitable post-method. In this study, fresh microalgae Scenedesmus almeriensis was treated by PEF and then subjected to extraction of amino acids after enzymatic protein hydrolysis. The residual biomass obtained from PEF treated and PEF-assisted valuables extraction were subjected to HTL in micro-autoclaves at a temperature of 350°C, pressure of 25 MPa for 15 min holding time. Product yields and analytical results obtained by elemental content, fourier-transform infrared spectroscopy, and gel permeation chromatography show that PEF alone has no significant direct influence on microalgae HTL. However, PEF accelerates the formation of amino acids by enzymatic hydrolysis, improving the extraction efficiency up to 150 % in the first 60 min of the extraction, while this accelerating effect fades out with longer extraction time. The extracted residue promises to produce 6 wt.% higher biocrude yield and better quality biocrude with lower nitrogen.
biofuel, microalgae, pretreatment
Biomass Conversion Technologies for Energy Carriers, Chemicals and Materials
27th European Biomass Conference and Exhibition
1127 - 1131
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