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Modelling Gas Production in Managed Sanitary Landfills

Environmental Engineering and Science, Department of Civil Engineering, Stanford University, Stanford, CA 94305 U.S.A.

C. Papelis

Environmental Engineering and Science, Department of Civil Engineering, Stanford University, Stanford, CA 94305 U.S.A.

C.P. Halvadakis

Environmental Engineering and Science, Department of Civil Engineering, Stanford University, Stanford, CA 94305 U.S.A.

J.O. Leckie

Environmental Engineering and Science, Department of Civil Engineering, Stanford University, Stanford, CA 94305 U.S.A.

Gas production and recovery from managed sanitary landfills can be simulated by describing the time and space variation of the total pressure and composition of the mixture of gases (CH₄, CO₂, and N₂) in the landfill. The variation of the total pressure and the composition of the gas mixture is described by the equations for mass conservation for each component (including a generation term for CH₄ and CO₂), the equation of motion, and the equation of state. Simulations of gas production compare well with field data from the Mountain View controlled landfill project field experiment. The function used to approximate the shape of the methanogenesis curve (based on equations describing the biochemical processes) consists of a rising hyperbolic branch and a decaying exponential branch. The conceptual framework of the model has been designed to incorporate equations describing the physics, biology, and chemistry of gas production in landfills.

Key Words: Managed landfills • methanogenesis • gas production • gas transport • numerical modelling • simulations • biogas • solid waste • methane.

Waste Management & Research, Vol. 6, No. 1, 115-123 (1988)
DOI: 10.1177/0734242X8800600121


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