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Biogas aus Lignocellulose – Hydro- oder vapothermale Vorbehandlung?
Citation Link: https://doi.org/10.15480/882.16490
Publikationstyp
Conference Poster not in Proceedings
Date Issued
2025-05-14
Sprache
German
TORE-DOI
Citation
Tag der Energieforschung 2025
Contribution to Conference
Publisher
Technische Universität Hamburg, Institut für Umwelttechnik und Energiewirtschaft
Peer Reviewed
false
The 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.
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.
Subjects
Biomethane
Vapothermal pre-treatment
Hydrothermal pre-treatment
Lignocellulose
Biorefinery
Bioenergy
DDC Class
006: Special computer methods
610: Medicine, Health
617: Surgery, Regional Medicine, Dentistry, Ophthalmology, Otology, Audiology
Publication version
publishedVersion
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