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Landfill Emission of Gases into the Atmosphere


Series: Advances in Air Pollution Volume: 4

Edited By: V Popov and H Power

WIT Press

Paperback | Dec 1999 | #85593 | ISBN: 1853126160
Availability: Usually dispatched within 1-2 weeks Details
NHBS Price: £88.00 $113/€96 approx

About this book

In this volume the authors describe a mathematical model for the solution of convection-diffusion flow of a mixture of gases in a multi-layer porous media, and apply this to the problem of the generation and migration of gases inside a landfill and their release into the atmosphere. They present two different boundary element formulations, based upon the dual reciprocity method (DRM), to transform the resulting domain integrals into surface integrals. Chapter 1 provides a brief introduction to the field plus numerical schemes previously applied to the problem. This is followed with introductory material about sanitary landfills and landfill gases, with an emphasis on the importance of the control of the emission of the gases. The foundations of the convection-diffusion flow of mixture of gases in a porous media, including a review of heat generation and transport theory, are then given and the BEM formulations for single-gas and multi-gas models are explained. Chapter 5 presents the domain decomposition concept and tests it on a variety of one- and two-dimensional problems. The DRM-MD concept is then described in more detail and the validity of the algorithm is verified through a number of numerical examples. Finally, the model is applied to the design of trenches in a multi-layer landfill.


Introduction - General considerations; gas transport models; numerical simulations of gas flow out of a landfill; boundary element method; cell integration and dual reciprocity (DRM) method; nomenclature. Sanitary Landfills - Introduction; landfill description; landfill gases; gas production modelling. Fundamental Principles - Conservation of mass of species i; diffusive velocity and flux; governing equation; heat generation and transport. Boundary Element Formulation - Single gas model; multi gas model. Domain Decomposition on the DRM Approach - Approximating functions in the DRM; numerical examples. The DRM-MD Integral Equation Method - Introduction; basic concepts of the DRM-MD approach; numerical examples. BEM Solution for Design of Trenches in Multi-layered Landfills - Introduction; numerical examples and discussions.

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