Schultz, JanaJanaSchultzKaltschmitt, MartinMartinKaltschmitt2025-05-202025-05-202025-05-14Tag der Energieforschung (2025)https://hdl.handle.net/11420/55619The biogas potential of solid reed residues after vapothermal and hydrothermal pretreatment was investigated, supported by an analysis of the biomass composition and its structural properties. In a first series of experiments, a design of experiments (DoE) was used to investigate how the water content of the biomass before vapothermal pretreatment influences the biogas yield. Subsequently, reeds were subjected to hydrothermal pretreatment and vapothermal pretreatment, whereby temperature and residence time were varied. The water content of the biomass played a decisive role in biogas production after vapothermal pretreatment, with an optimum between 32 %FM and 46 %FM. In the main test series, the temperature had a significant influence on the subsequent anaerobic digestion, unlike the retention time. Vapothermal pretreatment showed a narrow optimal temperature range, while hydrothermal pretreatment led to biogas improvement over a wider temperature range. Both methods reached their highest efficiency at 170 °C, where methane production increased by 28 % (vapothermal) and 36 % (hydrothermal) compared to untreated biomass. After taking into account the mass losses during pretreatment, the net biogas increase for vapothermal pretreatment was 18 %, while it decreased to 6 % for hydrothermal pretreatment. Overall, under similar conditions, vapothermal pretreatment produced a comparable amount of biogas while exhibiting lower carbon loss. In addition, based on process energy estimates, vapothermal pretreatment can offer energy savings compared to hydrothermal pretreatment.dehttps://creativecommons.org/licenses/by/4.0/BiomethaneVapothermal pre-treatmentHydrothermal pre-treatmentLignocelluloseBiorefineryBioenergyComputer Science, Information and General Works::006: Special computer methodsTechnology::610: Medicine, HealthTechnology::617: Surgery, Regional Medicine, Dentistry, Ophthalmology, Otology, AudiologyConference Poster not in Proceedingshttps://doi.org/10.15480/882.1518310.15480/882.15183Conference Poster