Gas production and migration in landfills and geological materials

Nastev, Miroslav; Therrien, René; Lefebvre, René; Gélinas, Pierre

doi:10.1016/s0169-7722(01)00158-9

Cited by 113 publications

(96 citation statements)

References 5 publications

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“…Mathematical models have been developed for predicting gas pressure distributions and LFG flow patterns in landfills (Chen et al, 2000;Jung et al, 2009). Nastev et al (2001) used TOUGH 2 to simulate gas production and migration in landfills. Li et al (2013) presented a 1D analytical model for pressure distributions in MSW layers.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional coupled model for landfill gas and water transport in layered unsaturated soil cover systems

Guan

Xie

Qiu

et al. 2016

J. Zhejiang Univ. Sci. A

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Cover systems are used to prevent water infiltration into a waste body. They also play an important role in controlling landfill gas transport from the waste body to the atmosphere. It is important to assess the flux of landfill gas at the surface of a cover system by considering the coupled effects of rainwater infiltration and gas transport in the cover soils. We have developed a 1D mathematical model for coupled transient gas and water transport in unsaturated cover soils. The coupled model was solved by the finite element method. Results obtained by the proposed model agreed well with experimental data. Based on the proposed solution, the influences of gas pressure, gas permeability, and the thickness of the cover soils on soil gas concentration profiles were investigated. The difference in soil gas concentration reached up to 31% as the thickness of cover increased from 1 to 2 m. Gas concentration at a depth of 0.2 m decreased by 6% as the amplitude of atmospheric gas pressure fluctuation increased from 20 to 100 Pa. The gas concentration increased by only 3% when gas permeability increased by a factor of 2 for a relatively long period of gas migration (e.g., 60 h) under the given conditions. Results suggest that both diffusion and advection should be considered when estimating gas transport in unsaturated cover soils. The numerical model can be used in the design of cover systems in relation to gas breakthrough time, breakthrough concentration, and flux.

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Section: Introductionmentioning

confidence: 99%

One-dimensional coupled model for landfill gas and water transport in layered unsaturated soil cover systems

Guan

Xie

Qiu

et al. 2016

J. Zhejiang Univ. Sci. A

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“…Of the two studies that use nonbatch models, the Das and Keener (1997) model is two-dimensional, and the Popov and Power (1999) model considers each of the layers to be a different batch reactor. Using the fully three-dimensional TOUGH2 framework, Nastev (1998) considered the flow and transport of gas in detail, but used rev. 1.0 a prescribed time-varying generation rate for the evolution of gas rather than a rigorous model of the biological processes of gas production.…”

Section: Introductionmentioning

confidence: 99%

T2LBM Version 1.0: Landfill bioreactor model for TOUGH2

Oldenburg¹

2001

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“…However, because of the computational advantages of the ADM, many researchers have attempted to develop simplified approaches that might allow the use of Fick's law within an ADM framework to describe transport of multicomponent gas mixtures. The objective has been to define a characteristic diffusion coefficient of each species in the mixture, i.e., an effective diffusivity [Findikakis and Leckie, 1979] [Nastev et al, 2001].…”

Section: A) Gas Flow In Landfillsmentioning

confidence: 99%

Intelligent Bioreactor Management Information System (IBM-IS) for Mitigation of Greenhouse Gas Emissions

Imhoff¹,

Yazdani²,

Augenstein³

et al. 2010

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Methane is an important contributor to global warming with a total climate forcing estimated to be close to 20% that of carbon dioxide (CO2) over the past two decades. The largest anthropogenic source of methane in the US is "conventional" landfills, which account for over 30% of anthropogenic emissions. While controlling greenhouse gas emissions must necessarily focus on large CO2 sources, attention to reducing CH4 emissions from landfills can result in significant reductions in greenhouse gas emissions at low cost. For example, the use of "controlled" or bioreactor landfilling has been estimated to reduce annual US greenhouse emissions by about 15-30 million tons of CO2 carbon (equivalent) at costs between $3-13/ton carbon. In this project we developed or advanced new management approaches, landfill designs, and landfill operating procedures for bioreactor landfills. These advances are needed to address lingering concerns about bioreactor landfills (e.g., efficient collection of increased CH4 generation) in the waste management industry, concerns that hamper bioreactor implementation and the consequent reductions in CH4 emissions. Collectively, the advances described in this report should result in better control of bioreactor landfills and reductions in CH4 emissions. Several advances are important components of an Intelligent Bioreactor Management Information System (IBM-IS).5 III. Executive SummaryMethane is an important contributor to global warming with a total climate forcing estimated to be close to 20% that of carbon dioxide (CO2) over the past two decades. The largest anthropogenic source of methane in the US is "conventional" landfills, which account for over 30% of anthropogenic emissions. One means of mitigating methane emissions is to operate landfills as "controlled landfills" or "bioreactors." Here, biological conditions in the waste are optimized allowing more rapid and complete waste decomposition. In "anaerobic bioreactors" methane generation is enhanced through liquid addition. High efficiency capture of methane is utilized to maximize fuel energy recovery and minimize fugitive emissions. In "aerobic bioreactors" air and liquid are introduced in the landfill and the combined effects of heat and oxygen inhibit methane formation. Both "controlled" landfill operations hold promise for mitigating fugitive methane emissions from landfills.A recent NETL sponsored economic study of anaerobic controlled landfilling estimated that such landfilling could reduce annual US greenhouse emissions by about 15-30 million tons of CO2 carbon (equivalent) at costs between $3-13/ton carbon. Given the promise of this technology, several bioreactor landfills have been constructed in the United States, although most are fieldscale research landfills. While a few commercial bioreactor landfills have been built, the waste management industry has yet to embrace this technology because of lingering concerns about the capture of fugitive greenhouse gases, how to manage liquid addition to maintain optimal moist...

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Gas production and migration in landfills and geological materials

Cited by 113 publications

References 5 publications

One-dimensional coupled model for landfill gas and water transport in layered unsaturated soil cover systems

One-dimensional coupled model for landfill gas and water transport in layered unsaturated soil cover systems

T2LBM Version 1.0: Landfill bioreactor model for TOUGH2

Intelligent Bioreactor Management Information System (IBM-IS) for Mitigation of Greenhouse Gas Emissions

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