Huang, ZhigangZhang, JiangPan, MinminHao, YuhangHu, RuichenXiao, WenboLi, GangLyu, Tao2022-01-172022-01-172021-12-31Huang Z, Zhang J, Pan M, et al., (2022) Valorisation of microalgae residues after lipid extraction: Pyrolysis characteristics for biofuel production. Biochemical Engineering Journal, Volume 179, February 2022, Article number 1083301369-703Xhttps://doi.org/10.1016/j.bej.2021.108330http://dspace.lib.cranfield.ac.uk/handle/1826/17412As 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.enAttribution-NonCommercial-NoDerivatives 4.0 InternationalBioenergyPyrolysis pathwaysNet-zero emissionMicroalgae technologyCircular economyArticle