Evaluation of dual permeability of gas flow in municipal solid waste: Extraction well operation

Liu, Lei; Ma, Jun; Xue, Qi‐Kun; Zeng, Gang; Zhao, Ying

doi:10.1002/ep.12363

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…Gas flux and RoI of extraction wells were key parameters in the gas collection system design for landfills . RoI was the main basis for determining the spacing and the number of extraction wells in the design of LFG collection system, which referred to the maximum range of LFG collected by extraction well.…”

Section: Simulation and Analysis Of Lfg Migration Rulementioning

confidence: 99%

Study on landfill gas migration in landfilled municipal solid waste based on gas–solid coupling model

Zeng

2019

Env Prog and Sustain Energy

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Gas migration rule is of great significance to the safe disposal of landfill. In this article, a gas–solid coupling model was developed and used to simulate the effects of various factors on gas migration. The simulation results showed that gas pressure in landfill decreased with the increase of extraction pressure, anisotropy ratio, coverage gas permeability, extraction well depth, and coverage thickness. The maximum value of gas pressure could reach 683 Pa. Among these factors, extraction pressure played the largest role in the gas pressure, while coverage thickness played the smallest role in it. The radius of influence (RoI) and gas flow rate increased with the increase of extraction pressure, refuse gas permeability, coverage thickness, and the extraction well depth, but with the decrease of coverage gas permeability. The effect of extraction well depth on RoI and gas flow rate was the most significant. When extraction well depth increased from 0.5 landfill height to 0.9 landfill height, the maximum values of RoI and extraction volume increased by 20 m and 20 m3/hr, respectively. It was suggested that the design of landfill gas (LFG) collection system should consider the influence of various factors in practical engineering.

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Section: Simulation and Analysis Of Lfg Migration Rulementioning

confidence: 99%

Study on landfill gas migration in landfilled municipal solid waste based on gas–solid coupling model

Zeng

2019

Env Prog and Sustain Energy

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“…Liu et al . (2016a,b) conducted an aeration test in a field site in the Yiling Landfill in China. The average injection rate of a single well in the initial phase was 82 m 3 /h.…”

Section: Operation Parameters Of Air Injection Wellmentioning

confidence: 99%

“…Therefore, the injection rate in laboratory test is larger than that in field site (shown in Table 1). Liu et al (2016a,b) [44,51] Figure 1. The gas pressure varied with the air flow rate in landfill [22].…”

Section: Air Injection Ratementioning

confidence: 99%

“…Test result showed that the space of the matrix domain was vastly larger than the fracture domain. Liu et al [44,51] conducted the simulation of pumping test in field site by using dual-permeability model and found that preferential flow affected the gas pressure distribution at extraction condition. The aforementioned studies have indicated that the preferential flow effect should be considered in predicting the gas injection well distribution in full scale.…”

Section: Scaling Effectmentioning

confidence: 99%

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The viability of design and operation of the air injection well for improvement In Situ repair capacity in landfill

Liu

Xue

et al. 2016

Env Prog and Sustain Energy

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The rationality of air injection well for operation parameter design is important for effective repair and safety of aeration systems in landfills. On the basis of the literature, the operating results of the air injection systems used in field sites were summarized, and the key design parameters were addressed. The operation and assessment of aeration systems were presented. First, the behavior of oxygen transport was caused by the characteristics of the pore media in the waste body. A mathematical model was needed to address the spatial–temporal evolutions of oxygen concentration in landfill. The optimum design method of gas injection well should be developed to elevate the oxygen content at maximum level across the field site, applying to most landfills. Second, an effective leachate exchange and recirculation plan should be developed to ensure sustained aerobic reaction in full scale. Some experiences of leachate discharge in field sites were presented. Third, the relationship between oxygen consumption and stability indicators should be determined to create an effective aeration plan. This function will help evaluate the reliability of aeration systems. This study provides evidence for the design, construction, operation, and effectiveness assessment of air injection well in repair engineering of landfills. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 412–419, 2017

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Modeling the oxygen transport process under preferential flow effect in landfill

Liu

Xue

et al. 2018

Environ Sci Pollut Res

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Evaluation of oxygen distribution during aeration in landfill is significantly important to determine the design parameters of an injection well. A coupling model describing gas preferential transport in a landfill was developed, which linked the effect of advection-diffusion and oxidation reaction and mass exchange between the fracture and the matrix system. The quantitative simulation of the variation in gas distribution during vertical well aeration in short term was presented, combined with the typical cases in field site. The parameter sensitivity in the coupling model to gas transport was addressed. Simulation result of the oxygen and methane concentrations by using the dual advective-diffusive (DAD) model, which considered the immobile zone effect, was closer to the monitoring data than that by using single advective-diffusive model. The variation of the AR under aeration was presented with the key parameters to provide the theory evidence for gas well design in landfill. This study provided reference for the design of the gas injection well distribution in aerobic landfill.

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Evaluation of dual permeability of gas flow in municipal solid waste: Extraction well operation

Cited by 5 publications

References 22 publications

Study on landfill gas migration in landfilled municipal solid waste based on gas–solid coupling model

Study on landfill gas migration in landfilled municipal solid waste based on gas–solid coupling model

The viability of design and operation of the air injection well for improvement In Situ repair capacity in landfill

Modeling the oxygen transport process under preferential flow effect in landfill

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