Global Journal of Science Frontier Research, H: Environment & Earth Science, Volume 22 Issue 1

Fig. 9: Schematic summary of scenario 2. Fig. 10: Schematic summary of scenario 3 g) Land GEM There are theoretical and experimental formulations to determine the potential of gas generation from landfill. The experimental ones consider the real measurements and therefore their determination is more difficult. In this work, the theoretical formulation will be used. In Brazil there is no developed methodology that takes into account local peculiarities, such as waste composition, climate and landfill operation. The model adopted for this study, the software Land GEM (Landfill Gas Emissions Model), is a program developed by EPA [18]. In this model the standard inventory and parameters were developed from empirical data from US MSW landfills. Land GEM accounts the amount and variations in landfill gas generation, calculating the emission of CH 4 and the emission of 49 other components, including CO 2 . The Land GEM equation in version 3.02 considers the generation of methane with an increment of 0.1 each year, producing a small reduction in the estimated emissions compared to previous versions [19]. h) Calculation of the CH 4 emissions The Land GEM model uses equation (3) to calculate the estimated annual emissions for the specified period. Q CH4 = ∑ ∑ k. L 0 � M t 10 � . e −k.t i,j 1 j=0,1 n i=1 Where: Q CH4 - annual methane generation in the year of the calculation (m 3 /year); i =1 - year time increment; n - corresponds to the year of the calculation (initial year of opening of the landfill); j = 0.1 - year time increment; k - methane generation rate (year-1 ); L 0 - methane generation (m 3 /ton.); 1 Year 2022 59 © 2022 Global Journals Global Journal of Science Frontier Research Volume XXII Issue ersion I VI ( H ) Energetic Potential of the Biogas from Urban Solid Waste Generated in the Jacareí Municipal Landfill, Brazil