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Importance of food waste pre-treatment efficiency for global warming potential in life cycle assessment of anaerobic digestion systems
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Department of Environmental Engineering (DTU Environment), Technical University of Denmark.
Department of Environmental Engineering (DTU Environment), Technical University of Denmark.
Department of Environmental Science and Engineering, Technical University of Denmark.
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2015 (English)In: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 102, p. 58-66Article in journal (Refereed) Published
Abstract [en]

A need for improvement of food waste (FW) pre-treatment methods has been recognized, but few life cycle assessments (LCA) of FW management systems have considered the pre-treatment with respect to input energy, loss of organic material and nutrients for anaerobic digestion (AD) and/or further treatment of the refuse. The objective of this study was to investigate how FW pre-treatment efficiency impacts the environmental performance of waste management, with respect to global warming potential (GWP). The modeling tool EASETECH was used to perform consequential LCA focusing on the impact of changes in mass distribution within framework conditions that were varied with respect to biogas utilization and energy system, representing different geographical regions and/or different time-frames. The variations of the GWP due to changes in pre-treatment efficiency were generally small, especially when biogas and refuse were substituting the same energy carriers, when energy conversion efficiencies were high and slurry quality good enough to enable digestate use on land. In these cases other environmental aspects, economy and practicality could be guiding when selecting pre-treatment system without large risk of sub-optimization with regards to GWP. However, the methane potential of the slurry is important for the net LCA results and must be included in the sensitivity analysis. Furthermore, when biogas is used as vehicle fuel the importance of pre-treatment is sensitive to assumptions and approach of modelling marginal energy which must be decided based on the focus and timeframe of the study in question

Place, publisher, year, edition, pages
2015. Vol. 102, p. 58-66
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-8802DOI: 10.1016/j.resconrec.2015.06.012ISI: 000362147800007Scopus ID: 2-s2.0-84937415212Local ID: 7592bf78-c948-453c-a188-0b5470c11c57OAI: oai:DiVA.org:ltu-8802DiVA, id: diva2:981740
Note
Validerad; 2015; Nivå 2; 20150812 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Carlsson, MyLagerkvist, Anders

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