A composite compressibility model to investigate the settlement of an existing MSW landfill

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In this work, a composite compressibility model has been developed to investigate the settlement of Municipal Solid Waste (MSW) in an existing landfill in Belgium. Instantaneous response to load, time-dependent mechanical creep, and time-dependent biological decomposition of the waste are three essential concepts for developing the model. The model parameters are based on laboratory one-dimensional compression tests, topographical measurements using a drone data acquisition system, and note that the data available at the Pollux Consulting Database from published literature and experience. Parameter values for the MSW at the landfill were obtained by nonlinear regression analysis. Furthermore, due to biological waste decomposition, landfill gas is produced as a result of a sequence of physical, chemical, and biological processes occurring within an anaerobic landfill. Based on the specific composition of the waste and the individual biological landfill gas potential values of the different waste streams, one can calculate the specific biological landfill gas potential value of a landfill. Our investigations showed that the application of the composite model requires ve parameter values and knowledge of the history of waste placement. Depending on the amount of information available for a particular landfill under consideration, the parameter values can be adjusted to provide the best fit with the available data. Moreover, the biogas potential depends on the number of organics and the amount of carbon in the organic material. External factors play a crucial role in biodegradation kinetics, such as temperature, rainfall, compaction of the waste, and filling technique.

9th International Congress on Environmental Geotechnics (ICEG2023)

Landfilling