Impacts of leachate flow conditions on the duration of the aftercare period
DOI:
https://doi.org/10.15626/Eco-Tech.2003.035Nyckelord:
Landfill leachate; Water flow modelling; Salt emissions; Aftercare period; Landfill cover; Flushing.Abstract
The environmental impacts of deposited MSW are mainly associated with the emissions
of leachate and biogas. While biogas emissions will become negligible within decades,
leachate emissions will stay on an environmental incompatible level for hundreds of
years, calculated under simplified assumptions. The generation of leachate from MSW
landfills is determined by the waste input, the climatic conditions and the landfill
construction and operation. In this paper the impacts of different construction (landfill
cover) and operation strategies (recirculation or flushing) on the duration of landfill
aftercare (in particular leachate treatment) are evaluated. Therefore a mathematical water
flow and solute transport model which has been successfully calibrated at full scale
landfills is used. The results indicate that the stabilization process of MSW landfills is
mostly determined by the internal flow conditions and that operation strategies have less
impact. Only the warranty of "homogeneous" water flow allows sufficient operation of
strategies for accelerated stabilization ofMSW landfills.
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