Avaliação da tratabilidade do chorume produzido no aterro sanitário “Marcelo Reis Arantes”, no município de Formiga – MG.
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Abstract
Due to the fact that the slurry has organic and inorganic compounds with biodegradable and recalcitrant characteristics, complex and variable physical, chemical and biological composition, it requires an appropriate treatment that is consistent with its characteristics, and treatment proposals that use only biological processes may not be efficient, requiring the combination of physical and chemical processes. In this context, this study aims to evaluate the evolution of the treatability of slurry produced at the Municipal Landfill "Marcelo Reis Arantes", in the city of Formiga - MG, from 2010 to 2020, as well as to propose physical-chemical post-treatment methods for this slurry. The landfill was inaugurated in 2009 and has a useful life of 21 years, and it is located in the rural community of Serrinha, approximately 8 km from the city center. By means of a systematic review, several studies were analyzed that used physical-chemical processes for the treatment of leachate that presents recalcitrant compounds, presenting the positive and negative results from the application of the techniques. A qualitative, quantitative and temporal characterization of the slurry produced at the Municipal Landfill "Marcelo Reis Arantes", in the city of Formiga - MG, was performed in order to assess the evolution of treatability over the 11 years of operation of this landfill. After applying statistical analysis, it was observed that the variables BOD and COD (output) showed significant increases over the years and that although the system is presenting efficiency of removal of such variables, from 2015 and 2011, respectively, it could no longer reduce the concentrations of BOD and COD and meet environmental legislation. It was evidenced that the efficiency of the existing treatment system is decreasing. Thus, it was recommended the construction of the 2nd Slurry Treatment Module and also the adoption of physical-chemical processes in its treatment. The COD/DBO ratio in most years was greater than or equal to 3.0, indicating that the slurry already requires care in the choice of biological process for its treatment, however, the slurry already shows a tendency to be heading towards a ratio greater than 5.0. Finally, the work resulted in a technical product, a dynamic spreadsheet with the purpose of organizing the database of the landfill, performing environmental monitoring and enabling the monitoring of the evolution over the years of the slurry treatment and the conditions of the receiving water body.
