Modeling the oxygen transport process under preferential flow effect in landfill

Liu, Lei; Ma, Jun; Xue, Qi‐Kun; Wan, Yong; Yu, Xiao

doi:10.1007/s11356-018-2053-8

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…The landfill gas pressure and concentration distribution were simulated, and the radius of influence of the aeration well was predicted. Similar multicomponent gas migration process simulations were conducted by Shi et al (2016), Liu et al (2018a), Feng et al (2019) and Ma et al (2020). The gas concentration prediction in the above studies was either completed by numerical simulations or analytical solutions of the gas pressure distribution derived under steady-state conditions.…”

Section: Introductionmentioning

confidence: 99%

Prediction of oxygen distribution in the waste mass from an aeration well in bioreactor landfills

et al. 2023

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The key to upgrade the efficiency of aerobic remediation of landfills is to determine the distribution characteristics of oxygen concentration during aerobic ventilation. This study discusses the distribution law of oxygen concentration with time and radial distance based on a single-well aeration test at an old landfill site. The transient analytical solution of the radial oxygen concentration distribution was deduced using the gas continuity equation and approximation of calculus and logarithmic functions. Oxygen concentration data from the field monitoring were compared with the results predicted by the analytical solution. The results indicated that the oxygen concentration initially increased and then decreased with prolonged aeration time. With an increase in radial distance, the oxygen concentration rapidly declined, followed by a gradual decrease. The influence radius of the aeration well increased slightly when the aeration pressure increased from 2 to 20 kPa. The field test data agreed with the analytical solution prediction results, preliminarily verifying the reliability of the oxygen concentration prediction model. Results from this study provide a basis of guidelines for the design, operation and maintenance management of a landfill aerobic restoration project.

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Section: Introductionmentioning

confidence: 99%

Prediction of oxygen distribution in the waste mass from an aeration well in bioreactor landfills

et al. 2023

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“…The need to acquire numerous parameters makes the model impractical. The distributions of O 2 and CH 4 around a single well were studied by Liu et al, considering preferential flow and CH 4 oxidation in a short period of time . However, the model has time and space limitations, which were quite different from field conditions.…”

Section: Introductionmentioning

confidence: 99%

Simulation of gas concentration during the process of air injection and extraction in a landfill

Liu

Yu³

et al. 2020

Env Prog and Sustain Energy

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Old landfills require pre‐aeration before excavation to reduce the emissions of volatile organic compounds and methane. Variation and distribution of gas species during landfill aeration is important in designing an aeration system and evaluating aeration progress. Limited research is conducted on the variation of gas concentration in aerobic landfills considering methane oxidation and aerobic waste degradation. In this study, a numerical model is developed considering reactions to simulate the changes in methane, oxygen, and carbon dioxide concentrations in landfills during air injection and extraction. Parameter sensitivity analyses are conducted to evaluate the effects of permeability, dispersion coefficient, maximum methane oxidation rate, and oxygen consumption rate on simulation results. Results show that the model is sensitive to oxygen consumption rate. Overall, the application of this model in aerobic landfills provides a practical method to predict gas concentration variation. This model can be used in the optimal design of in situ aeration system.

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“…Townsend et al established the pressure distribution model of homogeneous landfill, and analyzed the gas production rate, landfill thickness, and intrinsic permeability coefficient of landfill. Liu et al developed a coupling model describing gas preferential transport in a landfill. Nastev et al studied the migration of LFG in unsaturated soil by one‐dimensional and two‐dimensional simulation methods.…”

Section: Introductionmentioning

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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Modeling the oxygen transport process under preferential flow effect in landfill

Cited by 8 publications

References 24 publications

Prediction of oxygen distribution in the waste mass from an aeration well in bioreactor landfills

Prediction of oxygen distribution in the waste mass from an aeration well in bioreactor landfills

Simulation of gas concentration during the process of air injection and extraction in a landfill

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

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