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

year, depreciated by the PRICE amortization system in 10 years. The interest rate consider as reference is those practiced by the National Development Bank (BNDES) in credit operations for infrastructure projects of expansion and modernization of energy generation from renewable sources [27]. The sale of energy generated by the treatment plant will be considered as monthly revenue. The kWh cost is U$ 0.11. Its reference is the average cost of R$ 0.58/kWh in 2020 taken from [28] and converted to the average quotation of the dollar in reais (R$ 5.15) of the same year in according to BACEN [29]. III. R esults and D iscussion a) WARM Results The results of the WARM for different model scenarios are shown in Table 6 e 7. It is possible to observe that scenario 2 presented better results in terms of GHG emissions, showing a reduction in emissions of 102,494.35 of MTCeq and 375,812.60 of MTCO 2eq . In addition, this scenario had a greater increase in energy savings of 826,748.03 million BTU, which is equivalent to 142,297 barrels of oil or 6,613,984 gallons of gasoline. Scenario 1 was presented an intermediate results, wtih a saving in GHG and energy emissions. Analyzing GHG emissions, there was a reduction of 97,394.35 MTC eq and 357,114.46 MTCO 2eq , therefore, less significant than in scenario 2. However, there was an energy increase of 147,740.73 million BTU. Scenario 3 was less satisfactory. Comparating this scenario with the baseline, there was a reduction in GHG emissions, but the emissions were still higher than scenarios 1 and 2. Furthermore, an increase in energy use of 118,192.59 million BTU was observed, equivalent to 20,340 barrels of oil or 946,541 gallons of gasoline. Table 6: WARM results – Total energy use Scenario 1 Scenario 2 Scenario 3 Total energy use – MSW generation and management (million BTU) Baseline -292.995,89 -292.995,89 -292.995,89 Alternative Management -145.255,15 -1.119.743,92 -174.803,30 Incremental energy use 147.740,73 -826.748,03 118.192,59 Table 7: WARM results – Total GHG emission Scenario 1 Scenario 2 Scenario 3 Total GHG emission - MSW generation and management (MTCO 2eq ) Baseline 331.426,25 331.426,25 331.426,25 Alternative Management -25.688,21 -44.386,35 45.734,68 Incremental GHG emission -357.114,46 -375.812,60 -285.691,57 Total GHG emission - MSW generation and management (MTC eq ) Baseline 90.388,98 90.388,98 90.388,98 Alternative Management -7.005,88 -12.105,37 12.473,09 Incremental GHG emission -97.394,85 -102.494,35 -77.915,88 b) Land GEM Results The Land GEM model project the curve of CH 4 , CO 2 and NMOC emissions and the biogás production (Fig. 11). It is worth noting that as the model considers the same proportions of CH 4 and CO 2 in the composition of the biogas, the curves of these emissions coincide. The total gas emissions increase noticeably in the period from 2018 to 2040 ( from the open landfill to the closure landfill). At the end of landfills useful life (2040) the total of biogas emissions reaches 11.11 million m 3 /year, with 5.55 million m 3 /year corresponding to CH 4 emissions. When the waste disposal operations in the Jacarei landfill end, it is interesting to note that gas emissions do not cease immediately, but they start to present a sharp decline. Residual biogas emissions take many years to completely stop. It is known that these gases can cause damage to the environment, as well as to human health. Therefore it is necessary to monitor the landfill area even after its closure, avoiding possible accidents in the area. The Land GEM model identify the peak production of CH 4 and biogas generation as a year after the end of waste disposal in the landfill (2041), with a value of 5.71 million m 3 /year to CH 4 emissions and 11.43 million m 3 /year to biogas production. The maximum power generated was calculated from this volume of biogas with a value of 966 kW (Fig. 12). The optimal power was found using 45% of the maximum power thereby obtaining the energy (Table 8). 1 Year 2022 6 © 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