Modelagem de dispersão atmosférica do metano e do dióxido de carbono a partir das emissões de biogás no aterro sanitário de Maceió/AL

Abstract

The search for ways to contain the emission of greenhouse gases (GHG) and reduce the impacts caused by the concentration of these gases in the atmosphere is becoming increasingly urgent. In this scenario, several studies indicate that the disposal areas of solid urban waste (MSW), such as landfills, are largely responsible for GHG emissions in the world, through biogas, generated by microbial anaerobic digestion, which contains mainly methane and carbon dioxide. Thus, this work seeks to analyze the dispersion of these gases in the atmosphere, from the biogas emissions of the landfill of Maceió, Alagoas, using modeling of atmospheric dispersion. To this end, data will be collected on biogas flow in drains contained in the landfill cells and meteorological data from the region, which will be necessary to generate the numerical simulation of atmospheric dispersion of the gases with the software AERMOD. From the results of modeling, it was possible to visualize the highest concentration of methane and carbon dioxide, about 0.166 g/m³ and 0.335 g/m³, respectively, within the landfill area, and the concentrations in the surrounding urban area ranging from 0.03 to 0.05 g/m³ of methane and 0.05 to 0.09 g/m³ of carbon dioxide.