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Decision makers for waste management are confronted with the problem of selecting the most economic, environmental, and socially acceptable waste treatment process. This paper elucidates evaluation methods for waste treatment processes for the comparison of ecological and economic aspects such as material flow analysis, statistical entropy analysis, energetic and exergetic assessment, cumulative energy demand, and life cycle assessment.The work is based on the VDI guideline 3925. A comparison of two thermal waste treatment plants with different process designs and energy recovery systems was performed with the described evaluation methods. The results are mainly influenced by the type of energy recovery, where the waste-to-energy plant providing district heat and process steam emerged to be beneficial in most aspects. Material recovery options from waste incineration were evaluated according to sustainability targets, such as saving of resources and environmental protection.
Die neue VDI Richtlinie 3925 stellt Bewertungswerkzeuge vor, die es erlauben, ökologische, ökonomische und inzwischen auch soziale Aspekte und Auswirkungen verschiedener Abfallbehandlungsverfahren miteinander zu vergleichen. Die Richtlinie verfolgt das Ziel, die Anwendung von geeigneten wissenschaftlich-technischen Bewertungsmethoden auf abfallwirtschaftliche Fragen zu beschreiben. Die Methoden, deren Einsatz, Anwendung, Komplexität, Möglichkeiten und Grenzen werden anhand von Praxisbeispielen erläutert.---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
The new VDI guideline 3925 presents assessment tools for the comparison of economic, ecological and also social aspects of different waste treatment processes. Objective of the guideline is to describe the application of suitable scientific and technical assessment methods to waste management strategies. The methods, their applicability, complexity, opportunities and limits are illustrated using practical examples.