CALIBRATED WASTE SETTLEMENT PREDICTION DATA FROM NUMERICAL MODELLING OF WASTE PROCESSES AT SOME UK LANDFILL SITES

The development of a reliable numerical method to predict post-capping waste settlement with time by modelling waste degradation processes and the application of the model to a number of landfills are described in Thomas and Cooke (2007). Key points of that paper are summarised below. This paper provides greater detail of calibrated post-capping settlement predictions where several phases of landfilling have been modelled on a single site. The data are used to illustrate discussions of settlement prediction, calibration, biodegradability of waste types, landfilling approaches and formulation of revised post-settlement profiles to ensure planned post-settlement profiles will be achieved; thereby expanding conclusions drawn in Thomas and Cooke (2007). Possible future changes in the nature of wastes which will be landfilled in UK are discussed briefly.

A selection of calibrated results from a numerical predictive waste settlement model applied to UK landfill sites is presented, together with an explanation of calibration using postcapping survey data. The model is a reliable means of predicting post-capping settlement with time, based on waste degradation processes. At the time of writing this paper, the numerical predictive model has been applied to 29 landfill phases at 13 landfill sites and has been examined in a Public Inquiry. The presented waste settlement data are interpreted in terms of the wastes input and the landfilling approach applied. Reference is made to the principal factors which affect post-capping settlement. Explanation is made of the interpretation of post-capping settlement predictions in formulating revised post-settlement profiles which will ensure that the planned post-settlement restoration profile will be achieved. Possible future changes in the nature of wastes landfilled in UK are discussed briefly with reference to settlement modelling.



Copyright: © IWWG International Waste Working Group
Source: Specialized Session F (Oktober 2007)
Pages: 11
Price: € 11,00
Autor: S.D. Cooke
N. Walker
R.L. Thomas

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