Abstract
This paper presents the characterization of municipal solid waste (MSW) randomly collected from two material recovery facilities in São Paulo city, before (input — recyclables) and after (output — rejects) the sorting processes. Geo-environmental and geotechnical tests were performed on shredded samples and a digestion method was applied to detect the metals As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn concentrations using an ICP OES. The objective was to assist future activities of integrated solid waste management and soil pollution. Results showed different particle sizes comparing the input (44.6%) and the output MSW (75.1%) passing through the 100-mm sieve. Organic matter and ash contents indicated the influence of inorganic carbon due to the plastics’ presence, with values varying between 6 and 13%. The pH values obtained were neutral and the electrical conductivity of the MSW rejects suggested a higher amount of ions, with values above 1000 µS/cm. Metals analyses show that Cd, Cu, Ni, Pb, and Zn are present in high concentrations, depending on the types of the materials. Standard Proctor compaction curves yielded maximum dry unit weight varying from 6.6 to 10.0 kN/m3 and optimum moisture contents from 20 to 42%. Cohesion ranged from 1.3 to 31.3 kPa and friction angle from 3.2 to 42.9°. The results are comparable with those obtained for other countries using different MSW treatments and contribute to the data basis for MSW from the selective collection, aiming the integrated solid waste management, serving for other countries that adopt MSW sorting and recycling.Supplementary InformationThe online version contains supplementary material available at 10.1007/s11356-021-18281-w.
Highlights
Municipal solid wastes (MSW) have different physical, chemical, and biological properties because they are very heterogeneous about their geo-environmental and geotechnical parameters
This paper aims to present the results of geo-environmental and geotechnical tests performed with door-to-door selective collected MSW from São Paulo city, Brazil
Samples analyzed in this study were collected from the two material recovery facilities (MRFs) located in the municipality, since they receive most of the dry items from the selective collection carried out once a week in 75 districts — about 80 tons/day each, during the sampling period, from May 2017 to May 2018
Summary
Municipal solid wastes (MSW) have different physical, chemical, and biological properties because they are very heterogeneous about their geo-environmental and geotechnical parameters. Environmental Science and Pollution Research studies, as requirements for sanitary landfills projects This policy defines a hierarchy of actions for the solid waste destination before final disposal, aiming to reduce the amount of waste disposed into landfills. Adequate characterization and destination of the MSW which can be treated or reused, or the rejects directly disposed of into the landfills, is, extremely important to reach sustainable solid waste management. Within all these aspects above, what should be the project of future landfills? Within all these aspects above, what should be the project of future landfills? It is thought that all geotechnical, environmental, and generation estimation parameters may change considerably, and even from region to region, depending on how they contextualize their rejects
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