Gas Generation, Transport, and Extraction in Landfills

A model describing the generation, transport, and extraction of gas in a landfill has been developed. In the model the landfill gas is assumed to be an equimolar mixture of CH 4 and CO 2 . The waste is thought to comprise three classes of materials differing in their degree of biodegradability but a...

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Bibliographic Details
Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 1995-01, Vol.121 (1), p.33-44
Main Authors: Arigala, Sumadhu G, Tsotsis, Theodore T, Webster, Ian A, Yortsos, Yanis C, Kattapuram, James J
Format: Article
Language:English
Subjects:
ALKANES
Applied sciences
Biodegradation
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
ENVIRONMENTAL SCIENCES
ENVIRONMENTAL TRANSPORT
Exact sciences and technology
EXTRACTION
FORECASTING
GASEOUS WASTES
HYDROCARBONS
MANAGEMENT
MASS TRANSFER
MATHEMATICAL MODELS
METHANE
Numerical analysis
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
Pollution
Q1
SANITARY LANDFILLS
SEPARATION PROCESSES
TECHNICAL PAPERS
Urban and domestic wastes
WASTE DISPOSAL
WASTE MANAGEMENT
Wastes
WASTES 540120 > Environment, Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
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Summary:A model describing the generation, transport, and extraction of gas in a landfill has been developed. In the model the landfill gas is assumed to be an equimolar mixture of CH 4 and CO 2 . The waste is thought to comprise three classes of materials differing in their degree of biodegradability but all following first-order biodegradation kinetics. The model describes changes in the total pressure and not the partial pressures of the individual components. It predicts the pressure field inside a landfill, where gas extraction occurs from a number of wells placed at arbitrary points. The wells are assumed to be one-dimensional line sinks with uniform gas extraction rates. When the walls of the landfill are impermeable to flow, the model equations can be solved analytically. The full problem describing a landfill with permeable walls is treated numerically. The effect of the various parameters, such as gas-extraction rates, generation rates, and permeabilities are discussed.
ISSN:0733-9372
1943-7870
DOI:10.1061/(ASCE)0733-9372(1995)121:1(33)