Browsing by Person "Auburger, Sebastian"

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Nachhaltige Biogasproduktion unter besonderer Berücksichtigung des Einsatzes von Zuckerrüben und Grünlandaufwuchs sowie der Gärrestverwertung
(2017) Auburger, Sebastian; Bahrs, Enno
The present cumulative dissertation assesses the sustainability of biogas production in Germany from different points of view. A special focus is brought to sugar beets and grassland as a biogas feedstock as well as to biogas residue utilization. Chapter 2 presents an approach of manure distribution within regions based on municipality biogas and livestock production data. The developed algorithm distributes nutrients of nutrient surplus municipalities to municipalities with nutrient adsorption capacity within a study area (Lower Saxonia and North Rhine-Westphalia). It was shown that farmers and biogas producers will be confronted with higher manure and biogas digestate disposal costs. Chapter 3 enlarges the view by taking pig producers and experts interviews into consideration. Chapter 4 presents an approach to determine the regional biogas feedstock input based on regional agricultural production cost data and almost 8,000 biogas plants in Germany. By using a linear optimization approach regional feedstock inputs are calculated. Furthermore greenhouse gas emissions of power production based on biogas are estimated. Chapter 5 enlarges the modeling approach by an energy balancing tool and assesses sugar beets as an energy crop for biogas production in detail. Therefore different scenarios are taken into account. Silage corn was the most competitive feedstock over almost every region in Germany. Round about 160 kg CO2eq per kWh from biogas production were calculated, which is a significant lower value in comparison to greenhouse gas emissions from current power mix in Germany. Chapter 6 focuses on grassland as a biogas feedstock. Based on data availability calculation had to be restricted to Federal States of Schleswig-Holstein, Lower Saxonia and Bavaria. Results show that grassland is a competitive biogas feedstock in regions, which are characterized by unfavorable production circumstances of silage corn and only if for grassland favorable scenario assumptions are chosen.