This study is to a large part a synthesis of our previous studies. The long-term goal with the project has been to develop and demonstrate methods to handle waste treatment disposal (landfilling and incineration) in connection with LCA (Life Cycle Assessments). The main problem when modelling landfilling of waste in LCA is the time aspects - how should long-term future emissions be interpreted in a LCA. Our approach is that the emissions are integrated over different time periods: · a surveyable period, which is the period until a pseudo steady-state in the landfill processes is obtained. This period should usually be of the magnitude of one century. · a hypothetical, infinite time period, which is the period from the start until the landfilled material is completely released to the environment. In this approach the processes in the landfill must be known, but not the exact kinetics of the landfill. This makes the approach site-independent. From model studies of different types of waste and landfills we draw the conclusion that the surveyable time approach is usable for several types of waste. For several cases it is possible to define a surveyable time period on the basis of physical, chemical and microbiological processes in the landfill. In the report emission factors for MSW landfills, biofills (biocell), incineration ashes, coal ashes, metal hydroxide sludge landfills and mine tailings are given. The emissions of metals during the surveyable time period are often rather small compared to the total emissions during the hypothetical infinite time period, from both municipal solid waste landfills and different kind of ash landfills. The emission factors are of the magnitude
Medarbetare: Jan-Olov Sundqvist
Nyckelord: Life-Cycle assessment, LCA, solid waste treatment, disposal
Författare: Jan-Olov Sundqvist
Publicerad i: "Avfallsforskningsrådet; AFR, AFR-Report 279. ISSN 1102-6944:; ISRN AFR-R-279-SE"