Title:
Fermentation of Green Waste in Baden-Württemberg - Potential and Realistic Assessment
Author(s):
Pilsl, P., Böhme, L., Leverenz, D., Mathias, A., Hafner, G.
Document(s):
Paper
Poster
Abstract:
Present paper estimates the energy potential of digestion of green waste and the required demand of facilities for the federal state of Baden-Württemberg, Germany. Therefore, the amount of fermentable (herbaceous) green waste and its biogas and methane production is investigated. Surveys at urban and rural districts of Baden-Württemberg yielded a composition of the collected green waste of about 50% herbaceous and 50% woody parts. Due to large variations of the single values, subsequent potential extrapolation is additionally implemented for herbaceous shares of 35% and 65%. Bench scale fermentation tests revealed a biogas production of 74 l/kgFM for mixed herbaceous green waste. Respective biogas yield can increase up to 167 l/kgFM depending on the share of grass clippings. Contrary, leaves decrease this value, due to the low biogas production of 51 l/kgFM. The methane content was determined to 56% for mixed herbaceous green waste and to 59% for leaves and grass clippings. Based on ascertained data, the technical potential for the fermentation of green waste in Baden-Württemberg amounts between 0.40 PJ at an herbaceous share of 35% and 0.75 PJ at a share of 65% herbaceous green waste. Due to predicted increasing amounts of collected green waste, the potential for 2020 is 0.02 to 0.03 PJ higher. In 2020, theoretically 19 - 34 facilities with an annual throughput of 18,000 tons are possible, assuming that 35% - 65% of the green waste is herbaceous. The profitability analysis shows that the addition of a green waste fermentation unit to a written off composting plant could be economically attractive, depending on the investment costs.
Keywords:
anaerobic digestion, fermentation, organic waste, potential, green waste
Topic:
Biomass Resources
Subtopic:
Municipal and industrial wastes
Event:
23rd European Biomass Conference and Exhibition
Session:
1CV.3.74
Pages:
373 - 377
ISBN:
978-88-89407-516
Paper DOI:
10.5071/23rdEUBCE2015-1CV.3.74
Price:
FREE
