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Hydrothermal liquefaction (HTL) represents a transformative technology in the quest for net-zero emissions and the establishment of a circular bio-economy. This study investigates an innovative approach to waste valorization by converting digestate fibers from biogas plants into renewable fuels using HTL and catalytic upgrading. The HTL process yielded biocrude with 37 wt% and achieved 70 wt% energy recovery from the dry ash-free biomass, demonstrating HTL's efficiency in capturing energy from biowaste...