The mathematical model of the conversion of a landfill operation from anaerobic to aerobic

Omar, Hecham M.; Rohani, Sohrab

doi:10.1016/j.apm.2017.05.020

Cited by 14 publications

(3 citation statements)

References 31 publications

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“…Comparing the influence of aeration and recirculation on temperature, it can be found that recirculation has a more significant impact on temperature, which significantly affects the peak temperature and has an impact on the arrival time of peak temperature. In contrast, aeration has a small impact on temperature, which is similar to the conclusion proposed by Omar and Rohani (2017) . This phenomenon is mainly influenced by the specific heat capacity.…”

Section: Resultssupporting

confidence: 87%

“…The energy conservation equation can be used to describe the change of temperature distribution. Liu (2009) established the coupling dynamics model of landfill gas migration under the condition of heat release, and Omar and Rohani (2017) proposed the energy conservation equation. In this article, based on the coupling equation proposed by Liu and the expression of aeration and recirculation in Omar’s energy conservation equation, the coupled equation of seepage and temperature in the process of aerobic operation is established under the following assumptions: the studied waste is isotropic as a continuous medium; there is an internal heat source evenly distributed in the reactor; the changes of temperature and pressure in the whole operation period of the landfill can be ignored; the deformation of garbage skeleton and water infiltration are not considered and the gas dispersion effect is ignored.…”

Section: Seepage–temperature Coupling Model In Aerobic Operationmentioning

confidence: 99%

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Simulation and prediction of the effect of aeration, recirculation and degradation on landfill temperature in aerobic operation

Liu

Ding

et al. 2022

Waste Manag Res

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Much heat is released in aerobic landfills, which leads to temperature change. Quantitative prediction of temperature change with time and space is essential for the safe aerobic operation of landfill. In this article, based on the theory of porous media seepage mechanics and heat transfer, a seepage–temperature coupling model considering aeration, recirculation and degradation was established, which included internal energy change, heat conduction, convection and heat transfer. Moreover, combined with the long-time on-site monitoring temperature data from Wuhan Jinkou Landfill, the model’s reliability was preliminarily verified. Sensitivity analysis was carried out for aeration intensity, aeration temperature, recirculation intensity and recirculation temperature. Among the four factors, recirculation intensity influences the peak temperature most with a decrease of 20.11%. Compared with Borglin’s and Hao’s models, it is found that waste should not be assumed as a cell for temperature prediction. By comparing the results of Non-linear Ascent Stage model, Linear Ascent Stage model and Absent Ascent Stage model, it showed that the temperature difference of the three models decreases with the increase of operation time. In addition, the time point of peak temperature, t0, affects the temperature distribution. The above results provide a reference for predicting the spatial and temporal distribution of temperature and regulations for long-term aerobic landfill operations.

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Section: Resultssupporting

confidence: 87%

Section: Seepage–temperature Coupling Model In Aerobic Operationmentioning

confidence: 99%

Simulation and prediction of the effect of aeration, recirculation and degradation on landfill temperature in aerobic operation

Liu

Ding

et al. 2022

Waste Manag Res

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“…Mathematical modelling on the landfill system is one of great interest research problems [20][21][22][23]. Omar and Rohani solved the model equations using the finite element method with the commercially available software COMSOL Multiphysics® [24]. Cuartas et al proposed the new method for the analysis and optimization of design variables in waste landfills [25].…”

Section: Literature Review and Limitations Ofmentioning

confidence: 99%

Modelling Greenhouse Gas Generation for Landfill

Sirimangkhala

Pimpunchat

Amornsamankul

et al. 2018

International Journal of Simulation: Systems, Science &Amp; Technology

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Landfill has been widely used in many countries for the final disposal of solid waste material due to its economic advantages. Landfills emit mostly methane and carbon dioxide. In this work, the dynamic characteristics of greenhouse gases generated from the closed landfill system were studied. The chemical reaction processes involved are considered and a mathematical model is formulated and analyzed. The behaviors of the key greenhouse gases, namely, carbon dioxide and methane, are carefully studied. It was found that our proposed model is qualitatively in good agreement with the real world phenomena. The characteristics of greenhouse gases of interest namely carbon dioxide and methane were found to depend on the reaction rate in a complex manner. Since the system is closed, each gas species becomes a constraint to one another. We can utilize these findings to control the landfill system and to take benefit from the useful products. Moreover, it suggests that methane and carbon dioxide could be used for electricity generation which helps reduce greenhouse gases in atmosphere.

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Numerical model of aerobic bioreactor landfill considering aerobic-anaerobic condition and bio-stable zone development

Feng

Zheng

et al. 2019

Environ Sci Pollut Res

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The mathematical model of the conversion of a landfill operation from anaerobic to aerobic

Cited by 14 publications

References 31 publications

Simulation and prediction of the effect of aeration, recirculation and degradation on landfill temperature in aerobic operation

Simulation and prediction of the effect of aeration, recirculation and degradation on landfill temperature in aerobic operation

Modelling Greenhouse Gas Generation for Landfill

Numerical model of aerobic bioreactor landfill considering aerobic-anaerobic condition and bio-stable zone development

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