Abstract
The final disposal of solid waste in landfills may result in the production of a clean and renewable energy through the exploitation of biogas generated in these locations. This study aims to estimate the methane production in a landfill, with a total population of 237,298 inhabitants, and a total generation of waste of 83,561.78 ton/year, in the last year of operation, located in the state of Minas Gerais and evaluate the economic feasibility of a biogas exploitation project in this place, for electrical energy generation. The methane production was estimated by the Intergovernmental Panel on Climate Change (IPCC) methodology, obtaining the maximum methane production value of 6,692,590 mÑ in the last year of operation of the landfill. For economic feasibility analysis, the tools, such as net present value, discounted payback, and internal rate of return, were used with values of R$ 1,323,684.90 for 8 years, 4 months, and 12 days, and 9% per annum, respectively, demonstrating that the implementation of the project for the use of biogas at the landfill was viable, with positive economic return.
Highlights
The increase in the urban population combined with changes in consumption habits caused an increase in the production of urban solid waste (ICLEI, 2009)
Between 2018 and 2019, about 59.5% of the total solid waste collected went to landfills (ABRELPE, 2019), which are a form of environmentally appropriate final disposal provided by the National Solid Waste Policy (Brasil, 2010)
Step 1: Population estimate and solid waste generation in the municipalities served by the landfill
Summary
The increase in the urban population combined with changes in consumption habits caused an increase in the production of urban solid waste (ICLEI, 2009). These residues, when disposed inappropriately, result in public health and environmental problems, such as the proliferation of vectors and diseases and pollution of soil, water, and air (Figueiredo, 2011). Between 2018 and 2019, about 59.5% of the total solid waste collected went to landfills (ABRELPE, 2019), which are a form of environmentally appropriate final disposal provided by the National Solid Waste Policy (Brasil, 2010). It is clear that biogas generated in landfills can be characterized as a global problem, highlighting the importance of using it as an alternative to avoid the emission of this gas and, in return, generate a source of clean energy, because it has a high energy potential and is a renewable, economically viable, and environmentally correct source of energy (Bianek et al, 2018)
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