Using Life Cycle Assessment, this master thesis analyses the in-situ aeration of a landfill. Data collected in a research project of the Institute of Waste Management / University of Natural Resources and Life Sciences, Vienna, has been used. In-situ aeration of a landfill is a method to reduce emissions, particularly mathane. As a positive consequence, the aftercare period can be shortened. In this thesis, the environmental impacts of three different scenarios (in-situ aeration, state without any measures, excavation) were compared concerning their impact on climate change and eutrophication. The structure of this thesis follows the principles of DIN-EN-ISO 14040ff (2006). The environmental assessments have been calculated using the GaBi 4.3 software-tool. The results demonstrate that emissions can widely be avoided by in-situ aeration as well as in the course of excavation. Concerning the excavation-scenario, the recycling rate is very important. If all of the metals are recycled, excavation is the environmentally best alternative. However - depending on the recycling rate - the in-situ aeration can perform better. Furthermore costs of the scenarios were compared using different methods of investment appraisals. Results show that in-situ aeration is much cheaper than the excavation of the landfill. Although the creation of CO2-credits and revenues of the metals sale were considered, the excavation of the landfill is by far the most expensive alternative. The in-situ aeration is an economically competitive alternative to disposal site (landfill) excavation. Moreover it can be recommended as an ecologically beneficial option compared to the state without any measures.