Journal
WASTE MANAGEMENT
Volume 34, Issue 9, Pages 1644-1656Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2014.05.005
Keywords
Landfill; Modelling; Gas; Leachate; Recirculation; Degradation
Categories
Funding
- UK Engineering and Physical Sciences Research Council
- EPSRC [EP/I012206/1, EP/E041965/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E041965/1, EP/I012206/1] Funding Source: researchfish
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This paper describes the finite difference algorithm that has been developed for the flow sub-model of the University of Southampton landfill degradation and transport model LDAT. The liquid and gas phase flow components are first decoupled from the solid phase of the full multi-phase, multi-component landfill process constitutive equations and are then rearranged into a format that can be applied as a calculation procedure within the framework of a three dimensional array of finite difference rectangular elements. The algorithm contains a source term which accommodates the non-flow landfill processes of degradation, gas solubility, and leachate chemical equilibrium, sub-models that have been described in White and Beaven (2013). The paper includes an illustration of the application of the flow sub-model in the context of the leachate recirculation tests carried out at the Beddington landfill project. This illustration demonstrates the ability of the sub-model to track movement in the gas phase as well as the liquid phase, and to simulate multi-directional flow patterns that are different in each of the phases. (C) 2014 Elsevier Ltd. All rights reserved.
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