Abstract
The disposal of municipal solid waste (MSW) is currently a great challenge to society mainly due to the threat posed by leachate and gases released from the decomposition sites. Landfills have been widely used for this purpose because their waterproofing, drainage and treatment systems have reduced the risks of soil, water and air contamination. Estimating the amount of leachate and gases generated is extremely important for the control and operation of these systems. In this context, this study was developed in the landfill of Timbó, State of Santa Catarina, Brazil, in order to estimate the generation of leachate and to evaluate the effect of profile composition. HYDRUS-1D was used to simulate unsaturated fluid flow through layers. Data on soil matrix such as characteristic curve and unsaturated hydraulic permeability were obtained from previous studies and pedotransfer functions and the respective curves for MSW were obtained from literature. Thirteen layers were simulated by attributing an atmospheric variably boundary condition on top cover and free drainage on the bottom of the profile for two hydrologic years (2017-2019). HYDRUS-1D overestimated the leachate volume by 33.67% when compared with field data. Layers distribution showed an attenuation effect on leachate production which is consistent with design.
Highlights
The municipal solid waste (MSW) resulting from human activities pose a great challenge for the nowadays society
This work was a brief survey to investigate the production of leachate in a landfill located in Timbó, Santa Catarina, the south of Brazil
This paper estimated the generation of leachate in a landfill by means of HYDRUS-1D
Summary
The municipal solid waste (MSW) resulting from human activities pose a great challenge for the nowadays society. MSW need proper management, treatment and final disposal so that they do not cause environmental harm or became a threat to human health. The decomposition of solid waste leads to the generation of leachate and pollutant gases such methane, the control of these effluents generated in the final disposal area are of primary importance. To this end, the landfill design envisages the installation of drainage and collection systems for both gases and leachate, as well as waterproofing systems and a vegetative cover for avoiding potential contamination of the soil, air and groundwater
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