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Title (Primary) Valorisation of microalgae residues after lipid extraction: Pyrolysis characteristics for biofuel production
Author Huang, Z.; Zhang, J.; Pan, M.; Hao, Y.; Hu, R.; Xiao, W.; Li, G.; Lyu, T.
Journal Biochemical Engineering Journal
Year 2022
Department SOMA
Volume 179
Page From art. 108330
Language englisch
Topic T7 Bioeconomy
Keywords Bioenergy; Pyrolysis pathways; Net-zero emission; Microalgae technology; Circular economy
Abstract As a promising source of renewable energy, biofuel from microalgae pyrolysis is seen as a competitive alternative to fossil fuels. However, currently, the widely applied pre-treatment process of lipid extraction results in large amounts of microalgae residues, which though with energy potential, being considered as process wastes and ignored of its re-utilization potential. In this study, a new workflow of biofuel generation from microalgae biomass through lipid extraction and pyrolysis of defatted microalgae residues was proposed and assessed. The effects of lipid extraction and pyrolysis temperature (350–750 ℃) on pyrolysis products were investigated, and pyrolysis pathways were postulated. To address the twin goals of lowering emission of pollutants and elevating energy products, an optimal pyrolysis temperature of 650 ℃ was suggested. After extraction of lipids, the relative contents of valuable products (aromatic, aliphatic hydrocarbons and fatty acids) and some harmful by-products, e.g., PAHs, significantly reduced, while other harmful substrates, e.g., nitrogen-compounds increased. Mechanistic investigations indicated that pyrolysis of proteins without the presence of lipids could promote higher production of nitrogen-containing organics and aromatics. These results reveal the effects of lipid extraction and variation of temperature on microalgal pyrolysis, and also provide a basis for full utilization of microalgae as an aid to alleviate many fossil energy problems.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=25566
Huang, Z., Zhang, J., Pan, M., Hao, Y., Hu, R., Xiao, W., Li, G., Lyu, T. (2022):
Valorisation of microalgae residues after lipid extraction: Pyrolysis characteristics for biofuel production
Biochem. Eng. J. 179 , art. 108330