title: Life cycle assessment of flexibly fed biogas processes for an improved demand-oriented biogas supply.
abstract: This paper analyses concepts to facilitate a demand oriented biogas supply at an agricultural biogas plant of a capacity of 500kWhel, operated with the co-digestion of maize, grass, rye silage and chicken manure. In contrast to previous studies, environmental impacts of flexible and the traditional baseload operation are compared. Life Cycle Assessment (LCA) was performed to detect the environmental impacts of: (i) variety of feedstock co-digestion scenarios by substitution of maize and (ii) loading rate scenarios with a focus on flexible feedstock utilization. Demand-driven biogas production is critical for an overall balanced power supply to the electrical grid. It results in lower amounts of emissions; feedstock loading rate scenarios resulted in 48%, 20%, 11% lower global warming (GWP), acidification (AP) and eutrophication potentials, and a 16% higher cumulative energy demand. Substitution of maize with biogenic-waste regarding to feedstock substitution scenarios could create 10% lower GWP and AP.
authors: Chair of Bioprocess Engineering, Department of Biotechnology, Technische Universität Berlin, Ackerstr. 76, ACK24, 13355 Berlin, Germany.
authors: Funda Cansu
authors: FC
authors: Ertem
authors: Sustainable Engineering, Department of Environmental Technology, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany.
authors: Julia
authors: J
authors: Martínez-Blanco
authors: Sustainable Engineering, Department of Environmental Technology, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany.
authors: Matthias
authors: M
authors: Finkbeiner
authors: Chair of Bioprocess Engineering, Department of Biotechnology, Technische Universität Berlin, Ackerstr. 76, ACK24, 13355 Berlin, Germany.
authors: Peter
authors: P
authors: Neubauer
authors: Chair of Bioprocess Engineering, Department of Biotechnology, Technische Universität Berlin, Ackerstr. 76, ACK24, 13355 Berlin, Germany. Electronic address: stefan.junne@tu-berlin.de.
authors: Stefan
authors: S
authors: Junne
mesh_terms: D056804:Biofuels; D018556:Crops, Agricultural; D004777:Environment; D005068:Eutrophication; D007220:Industrial Waste; D008372:Manure
chemical_list: D056804:Biofuels; D007220:Industrial Waste; D008372:Manure
keywords: Biogas; Biogas production; Co-digestion; Feedstock flexibility; Life cycle assessment