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Maximum and minimum void ratio characteristics of MBT waste

Mechanical-biological treatment (MBT) of municipal solid waste (MSW) includes mechanical processing of MSW with subsequent biological treatment of its biodegradable components. One of the many possible outputs of the MBT plant is the so called "fine fraction" of MBT waste which is characterised by particle sizes smaller than 25 mm. This mechanically refined granular material is only partially stabilised during the aerobic degradation process which takes place under controlled conditions in the MBT plant (bio-drying). Rich in organic components, the "fine fraction" of MBT waste is suitable for landfilling into a bioreactor landfill with the aim of biogas production. Mechanical behaviour of the bioreactor landfill, during construction and use, is significantly influenced by the physical characteristics of the MBT waste material that is being installed. In this study, the physical and geotechnical properties of the MBT waste material were determined, with emphasis on the determination of maximum and minimum void ratios. Correlations relating maximum to minimum void ratios are also presented. Test results are compared to the results obtained for soils and some other granular materials, found in the available publications.

MBT waste, geotechnical properties, landfill, void ratio

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