Physical disruption of landfilled waste

Abstract

The study undertaken has focal points in:

        Characterisation of landfilled MSW

        Development of a disruption technique

        Testing of physical disruption in practice

        Investigation of the impact of vibrations on LFG formation

The results from the waste characterisation indicate that a great variation with regard to the extent of degradation may occur over a ten-year period. In some cases the degradation of organic material is quite complete after ten years whereas a substantial remaining potential for gas formation can be found in other cases. The degradation can be slowed by microbiological process conditions. These processes may be influenced through the fluid phases if the design of the landfill permits it. It could also be possible to influence flow conditions after the construction phase of the landfill through physical measures.

Different methods to influence landfill flow conditions have been studied and, as a prime choice, dynamite blasting has been identified. Following a series of blasting tests for method development purposes, in situ blasting at test cells were performed twice. An initial gas development could be noted, but because of high groundwater level in the landfill, only the short-term impact could be observed.

Gas collection data from landfills thought to be influenced by vibrations from on site traffic or nearby blasting activities were investigated using multivariate statistical methods, but no strong correlations could be found.

In conclusion it has been shown that there is a remaining degradation potential at some landfills or parts of landfills that could possibly be realized faster with the aid of physical disruption. Feasible disruption techniques exists and their merits now need assessment in large scale experiments.


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Last modified: October 22, 2001