A multi-component two-phase flow algorithm for use in landfill processes modelling |
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Authors: | J.K. White D. Nayagum R.P. Beaven |
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Affiliation: | 1. Faculty of Engineering and the Environment, University of Southampton, Highfield, Southampton SO17 1BJ, UK;2. FEESA Ltd, Westmead House, Westmead, Farnborough, Hants GU14 7LP, UK |
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Abstract: | 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. |
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Keywords: | Landfill Modelling Gas Leachate Recirculation Degradation |
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