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Stability Analyses of Municipal Solid Waste Landfills with Decomposition

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Abstract

A bioreactor landfill is operated to enhance refuse decomposition, gas production, and waste stabilization. Some of the potential advantages of bioreactor include rapid stabilization of waste, increased landfill gas generation, gain in landfill space, enhanced leachate treatment, and reduced post closure maintenance period. Due to the accelerated decomposition and settlement of solid waste, bioreactor landfills are gaining popularity as an alternative to the conventional Subtitle D landfills. However, the addition of leachate to accelerate the decomposition changes the physical and engineering characteristic of waste and therefore affects the geotechnical characteristics of waste mass. The changes in the physical and mechanical characteristics of solid waste with time and decomposition are expected to affect the shear strength of waste mass. The objective of this paper is to analyze the stability of solid waste slopes within the bioreactor landfills, as a function of time and decomposition. The finite element program PLAXIS is used for numerical modeling of bioreactor landfills. Stability analysis of bioreactor landfills was also performed using limit equilibrium program STABL. Finally the results from finite element program PLAXIS and limit equilibrium program STABL are compared. GSTABL predicted a factor of safety of more than 1 in all the cases analyzed, whereas PLAXIS predicted a factor of safety of less than 1 at advanced stages for a slope of 2:1. However, the interface failures between solid waste and landfill liners have not been considered in this paper.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Texas at Arlington, Arlington, TX, 76019, USA

    M. S. Hossain

  2. Bryant Consultants, Inc., Carrollton, TX, 75006, USA

    M. A. Haque

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  1. M. S. Hossain
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  2. M. A. Haque
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Correspondence to M. S. Hossain.

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Hossain, M.S., Haque, M.A. Stability Analyses of Municipal Solid Waste Landfills with Decomposition. Geotech Geol Eng 27, 659–666 (2009). https://doi.org/10.1007/s10706-009-9265-0

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  • DOI: https://doi.org/10.1007/s10706-009-9265-0

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