Development of a novel concept based on fast pyrolyses for the prodcution of high quality boi-oil at high yields. Development of a biomass pre-treatment process by leaching the feedstock with the light (water-rich) fraction of the pyrolysis oil in order to partially remove ash forming elements. CFD simulation to develop a low-emission bio-oil combustion in gas turbines. BIOS also supports an economically meaningful development of the full-scale design of the new concept with accompanying techno-economic analyses.