Modeling anaerobic bioreactor landfills in methanogenic phase: Long term and short term behaviors

Gholamifard, Shabnam; Eymard, Robert; Duquennoi, C.

doi:10.1016/j.watres.2008.09.040

Cited by 35 publications

(25 citation statements)

References 12 publications

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“…As shown in Figure 2 [19], specific methane formation rate increases with an increase of water content. Based on studies of Meima et al and Gholamifard et al [19,20], f water is further expressed as…”

Section: Biodegradation Modelmentioning

confidence: 99%

Analysis of solid-liquid-gas interactions in landfilled municipal solid waste by a bio-hydro-mechanical coupled model

Chen

Zhan

2011

Sci. China Technol. Sci.

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Based on first-order kinetics of hydrolysis process, biodegradation of municipal solid waste (MSW) is assumed to obey a first-order decay equation which can take the direct effect of water content on biodegradation into account. Hydraulic model is an unsaturated-saturated flow model using mass conservation equations for fluids. Mechanical compression of MSW is expressed by a stress-age coupled compression model. Through above models, a one-dimensional (1-D) bio-hydro-mechanical coupled model is established to analyze solid-liquid-gas interactions in landfilled MSW. Values of all the model parameters for current typical Chinese MSW are determined. Numerical analysis of a hypothetical waste sample in a closed system shows that gas pressure and gas concentration is extremely large which might cause severe gas explosion problem. Total gas production is about 267.0 m 3 per wet ton of fresh wastes. For another hypothetical landfilled MSW layer, the coupled model predicts a dissipation of gas pressure during passive gas collection process. Annual gas production is large at the beginning of biodegradation, and then decreases with time. Surface settlement of the wastes increases quickly initially and then becomes stable with a compression strain of about 0.32 after 20 years. municipal solid waste, solid-liquid-gas interaction, gas generation, settlement Citation:Chen Y M, Xu X B, Zhan L T. Analysis of solid-liquid-gas interactions in landfilled municipal solid waste by a bio-hydro-mechanical coupled model.

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Section: Biodegradation Modelmentioning

confidence: 99%

Analysis of solid-liquid-gas interactions in landfilled municipal solid waste by a bio-hydro-mechanical coupled model

Chen

Zhan

2011

Sci. China Technol. Sci.

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“…Because the production and the migration process of LFG is related to many disciplines and there are many influencing factors, the factors that are taken into account are different and there are many theoretical bases to be chosen when a model is established. In their models, Yu et al (2009) took into account the settlement of landfill, Hettiaratchi et al (2009) took into account leachate migration and settlement of landfill, and Gholamifarda et al (2008) took into account leachate and energy migration. Sanchez et al (2010) established a model to simulate the migration of LFG inside, where the leachate migration was taken into account.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of landfill gas pressure distribution in landfills

Xiong

2013

Waste Manag Res

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Landfill gas emissions are recognized as one of the three major concerns in municipal solid waste landfills. There are many factors that affect the generation of landfill gas when the landfill is capped. In this article, a model has been developed based on the theory of porous media flow. The model could predict the pressure distribution of landfill gas in landfill, coupling the effect of landfill settlement. According to the simulation analysis of landfill, it was found that: (a) the landfill gas pressure would reach a peak after 1.5 years, then begin to decline, and the rate of decay would slow down after 10 years; (b) the influence radius of the gas wells is limited; (c) the peak value of landfill gas pressure is larger, it appears later and the rate of decay is slower when the landfill settlement is considered in the model; (d) the calculation of excess gas pressure in landfill under different negative pressures of the extraction well is compared between this model and another model, and the results show that the relative pressure distribution form and range are almost the same.

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“…Waste placed in the landfill is converted into leachate, gas, transformed mass or remains unchanged. MSW can biodegrade naturally, breaking down the organic matter into smaller compounds (Gholamifard et al, 2008). The biodegradation, or decay, of the MSW occurs with a large collection of microorganisms that can digest the waste (McBean et al, 1995;Stams et al, 2003).…”

Section: Waste Stabilizationmentioning

confidence: 99%

“…The degradation of the organic waste into monomeric compounds is referred to as hydrolysis. Hydrolysis is the most important step in the biodegradation of the waste as it may be the rate-limiting step (Bareither et al, 2013;El-Fadel et al, 1996a;Gholamifard et al, 2008;Haarstrick et al, 2001;Nopharatana et al, 2007). Complex polymers in the waste such as polysaccharides, proteins and lipids are broken down into simpler organic compounds such as simple sugars, amino acids and long chain fatty acids (Ahring, 2003).…”

Section: Phase I: Hydrolysismentioning

confidence: 99%

“…The thermal conductivity used to model the heat transfer in a landfill in Alaska was 0.23 W/mK (Hanson et al, 2006). A mathematical model developed by Gholamifard et al (2008) for the anaerobic methanogenic phase assumed an initial thermal conductivity of 0.4 W/mK. Site data was later obtained from landfills in France providing better estimates of the thermal conductivity of the waste (0.6-0.8 W/mK) (Gholamifard et al, 2008).…”

Section: Thermal Conductivitymentioning

confidence: 99%

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Heat Transfer Model for an Engineered Landfill in Sainte-Sophie, Quebec, Canada

Megalla¹

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A conceptual and numerical heat transfer model was developed for a landfill gas to energy (LFGTE) facility in Ste. Sophie, Quebec. The operating LFGTE facility was instrumented with sensors to measure parameters affecting waste stabilization.Temperature data from the field was used to calibrate a heat transfer model to better understand the thermal processes and parameters. Waste was observed to stay frozen for up to 1.5 years when placed in thick layers during the winter. Detection of oxygen within the top 1 m of waste was directly correlated with temperature rises, indicating a heat source, likely aerobic biodegradation. In simulating the placement of five waste lifts over a five year period, aerobic digestion in the top 1 m generated 56% of the total heat generated. A brief sensitivity analysis was completed and the model was used to show the effect of waste sequencing on the vertical temperature profile over time.ii

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Modeling anaerobic bioreactor landfills in methanogenic phase: Long term and short term behaviors

Cited by 35 publications

References 12 publications

Analysis of solid-liquid-gas interactions in landfilled municipal solid waste by a bio-hydro-mechanical coupled model

Analysis of solid-liquid-gas interactions in landfilled municipal solid waste by a bio-hydro-mechanical coupled model

Numerical simulation of landfill gas pressure distribution in landfills

Heat Transfer Model for an Engineered Landfill in Sainte-Sophie, Quebec, Canada

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