engleski

Influence of wetting procedure on the compressibility of the bioreactor landfill

From a civil engineering point of view, bioreactor landfills can be seen as artificial embankments with so-called methanogenic fraction as the main construction block. Methanogenic fraction contains high amount of organic matter and as such it is suitable for landfilling into the bioreactor landfill. The material is landfilled in the dry state. However, after the landfill closure the wetting procedure of the landfill body is initiated with aim to enhance microbiological activities and to extract biogas. Due to wetting, unit weight of the landfill body will be increased, while the vertical effective stresses will be reduced. Consequently, additional settlements of the landfilled material can be anticipated. This paper focuses on the above mentioned consideration through numerical modelling simulations using GeoStudio software. Input parameters used within numerical models were obtained from series of oedometer tests. In order to define the initial stage, the dry state of the landfilled material is considered in the first step. In the second step the infiltration of leachate into the landfill body is taken into account. Comparison of results obtained in the first and second step reveals that the wetting of the landfill body in the after closure period will cause a significant amount of additional settlements.

bioreactor landfill, methanogenic fraction, compressibility

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