| Abstrakt: |
Nitrous oxide (N2O) is an important greenhouse gas (GHG) and an ozone-depleting substance that can be emitted from landfills. Understanding the dynamics of N2O and its contribution to total emissions is critical to effective mitigation measures. This study outlines the dynamics of N2O in solid waste landfills and N2O emissions from them. N2O generation in anaerobic landfills is primarily due to denitrification and, to a lesser extent, nitrification, which occurs in the oxygenated cover soil layer and the working face. However, nitrification and denitrification are very limited within landfills. The landfill leachate contains high concentrations of ammonia (NH3). Thus, a significant amount of N2O is generated from aerobic processes during leachate treatment. Bioreactor landfills emit more N2O than traditional anaerobic landfills. The majority of N2O emitted from bioreactor landfills is generated through different pathways, such as hydroxylamine (NH2OH) oxidation, nitrifier denitrification, and heterotrophic denitrification. These processes are affected by several factors, including the carbon-to-nitrogen (C/N) ratio, NH3 oxidation rate NH3 oxidation rate, redox conditions, and temperature. Addressing N2O emissions from landfills will be necessary to achieve an integrated nitrogen management strategy that helps minimize N2O emissions. [ABSTRACT FROM AUTHOR] |
