Abstract
Landfill gas and temperature in landfills are indices that reflect aerobic and anaerobic biodegradation. They are also important for evaluating the stabilization of landfills. Passive landfill gas extraction wells have been newly installed in a completed and closed landfill for the purpose of stabilization and observation of landfill gas components and temperatures. In several of the wells, both temperature and carbon dioxide concentration increase in the process of aerobic biodegradation, however in some of the other wells, anaerobic biodegradation is dominant. The passive landfill gas extraction wells seem to have a limited effect on stabilization of the landfill. The paper presents the results put forward by researchers who have been studying stabilization of landfills through chemical oxidation and aerobic biodegradation. Finally, vertical temperature distributions and temporal change of the temperatures in the landfill are reported, and the importance of temperature as an index for stabilization is discussed.
