title: An LCA model for waste incineration enhanced with new technologies for metal recovery and application to the case of Switzerland.
abstract: A process model of municipal solid waste incinerators (MSWIs) and new technologies for metal recovery from combustion residues was developed. The environmental impact is modeled as a function of waste composition as well as waste treatment and material recovery technologies. The model includes combustion with a grate incinerator, several flue gas treatment technologies, electricity and steam production from waste heat recovery, metal recovery from slag and fly ash, and landfilling of residues and can be tailored to specific plants and sites (software tools can be downloaded free of charge). Application of the model to Switzerland shows that the treatment of one tonne of municipal solid waste results on average in 425 kg CO2-eq. generated in the incineration process, and 54 kg CO2-eq. accrue in upstream processes such as waste transport and the production of operating materials. Downstream processes, i.e. residue disposal, generates 5 kg CO2-eq. Savings from energy recovery are in the range of 67 to 752 kg CO2-eq. depending on the assumptions regarding the substituted energy production, while the recovery of metals from slag and fly ash currently results in a net saving of approximately 35 kg CO2-eq. A similar impact pattern is observed when assessing the MSWI model for aggregated environmental impacts (ReCiPe) and for non-renewable resource consumption (cumulative exergy demand), except that direct emissions have less and no relevance, respectively, on the total score. The study illustrates that MSWI plants can be an important element of industrial ecology as they provide waste disposal services and can help to close material and energetic cycles.
authors: Aveny GmbH, Schwandenholzstr. 212, CH-8046 Zürich, Switzerland.
authors: Michael E
authors: ME
authors: Boesch
authors: ETH Zurich, Institute of Environmental Engineering, Schafmattstrasse 6, CH-8093 Zurich, Switzerland. Electronic address: vadenbo@ifu.baug.ethz.ch.
authors: Carl
authors: C
authors: Vadenbo
authors: Swiss Post, Communications, Politics and Social Responsibility, Viktoriastrasse 21, P.O. Box, CH-3030 Berne, Switzerland.
authors: Dominik
authors: D
authors: Saner
authors: City of Zürich, ERZ Entsorgung + Recycling Zürich, Hagenholzstrasse 110, P.O. Box, CH-8050 Zürich, Switzerland.
authors: Christoph
authors: C
authors: Huter
authors: ETH Zurich, Institute of Environmental Engineering, Schafmattstrasse 6, CH-8093 Zurich, Switzerland.
authors: Stefanie
authors: S
authors: Hellweg
mesh_terms: D004736:Energy-Generating Resources / Q000706:statistics & numerical data; D017745:Incineration / Q000379:methods*; D008670:Metals / Q000191:economics / Q000302:isolation & purification*; D008962:Models, Theoretical; D012037:Refuse Disposal / Q000379:methods*; D013557:Switzerland; D018505:Waste Management / Q000379:methods*; D014866:Waste Products / Q000032:analysis*
chemical_list: D008670:Metals; D014866:Waste Products
keywords: Carbon footprint; Energy recovery; Fly ash; Industrial ecology; Life cycle assessment (LCA); Metal recovery; Municipal solid waste incineration; Slag; Waste management