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Analytical Model for Multicomponent Landfill Gas Migration through Four-Layer Landfill Biocover with Capillary Barrier

Feng, Shi-Jin / Zhu, Zhang-Wen / Chen, Zhang-Long / Chen, Hong-Xin

An analytical model was developed to simulate migration of methane ( ${CH}_{4}$ ), oxygen ( $O_{2}$ ), carbon dioxide ( ${CO}_{2}$ ), and nitrogen ( $N_{2}$ ) through a four-layer landfill biocover, which can account for the four-layer structure and the diffusion-advection- ${CH}_{4}$ oxidation processes. The model was effectively validated against experimental data first. The influences of several important factors including pressure difference, degree of saturation, ${CH}_{4}$ oxidation, and layer thickness were then investigated. The water accumulating at the capillary layer benefits mitigating ${CH}_{4}$ emission. But increasing the degree of saturation of the top layer enhances ${CH}_{4}$ emission. The ${CH}_{4}$ emission rate is controlled by both diffusion and advection in the top layer but mainly controlled by advection in the capillary layer. The ${CH}_{4}$ emission rate reaches its minimum when the top layer thickness is close to that of the aerobic zone. Increasing the capillary-layer thickness can reduce ${CH}_{4}$ emission more effectively than increasing the total biocover thickness. A capillary layer with a thickness of 0.55 m can control the ${CH}_{4}$ emission rate below $0.45 mol / m^{2} / day$ under a pressure difference of 500 Pa.

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Analytical Model for Multicomponent Landfill Gas Migration through Four-Layer Landfill Biocover with Capillary Barrier

Feng, Shi-Jin / Zhu, Zhang-Wen / Chen, Zhang-Long / Chen, Hong-Xin

An analytical model was developed to simulate migration of methane ( ${CH}_{4}$ ), oxygen ( $O_{2}$ ), carbon dioxide ( ${CO}_{2}$ ), and nitrogen ( $N_{2}$ ) through a four-layer landfill biocover, which can account for the four-layer structure and the diffusion-advection- ${CH}_{4}$ oxidation processes. The model was effectively validated against experimental data first. The influences of several important factors including pressure difference, degree of saturation, ${CH}_{4}$ oxidation, and layer thickness were then investigated. The water accumulating at the capillary layer benefits mitigating ${CH}_{4}$ emission. But increasing the degree of saturation of the top layer enhances ${CH}_{4}$ emission. The ${CH}_{4}$ emission rate is controlled by both diffusion and advection in the top layer but mainly controlled by advection in the capillary layer. The ${CH}_{4}$ emission rate reaches its minimum when the top layer thickness is close to that of the aerobic zone. Increasing the capillary-layer thickness can reduce ${CH}_{4}$ emission more effectively than increasing the total biocover thickness. A capillary layer with a thickness of 0.55 m can control the ${CH}_{4}$ emission rate below $0.45 mol / m^{2} / day$ under a pressure difference of 500 Pa.

Analytical Model for Multicomponent Landfill Gas Migration through Four-Layer Landfill Biocover with Capillary Barrier

Feng, Shi-Jin / Zhu, Zhang-Wen / Chen, Zhang-Long / Chen, Hong-Xin

An analytical model was developed to simulate migration of methane ( ${CH}_{4}$ ), oxygen ( $O_{2}$ ), carbon dioxide ( ${CO}_{2}$ ), and nitrogen ( $N_{2}$ ) through a four-layer landfill biocover, which can account for the four-layer structure and the diffusion-advection- ${CH}_{4}$ oxidation processes. The model was effectively validated against experimental data first. The influences of several important factors including pressure difference, degree of saturation, ${CH}_{4}$ oxidation, and layer thickness were then investigated. The water accumulating at the capillary layer benefits mitigating ${CH}_{4}$ emission. But increasing the degree of saturation of the top layer enhances ${CH}_{4}$ emission. The ${CH}_{4}$ emission rate is controlled by both diffusion and advection in the top layer but mainly controlled by advection in the capillary layer. The ${CH}_{4}$ emission rate reaches its minimum when the top layer thickness is close to that of the aerobic zone. Increasing the capillary-layer thickness can reduce ${CH}_{4}$ emission more effectively than increasing the total biocover thickness. A capillary layer with a thickness of 0.55 m can control the ${CH}_{4}$ emission rate below $0.45 mol / m^{2} / day$ under a pressure difference of 500 Pa.

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Title:

Analytical Model for Multicomponent Landfill Gas Migration through Four-Layer Landfill Biocover with Capillary Barrier

Contributors:

Feng, Shi-Jin (author) / Zhu, Zhang-Wen (author) / Chen, Zhang-Long (author) / Chen, Hong-Xin (author)

Published in:

International Journal of Geomechanics ; 20

Publication date:

2020-01-02

ISSN:

1532-3641 , 1943-5622

DOI:

https://doi.org/10.1061/(ASCE)GM.1943-5622.0001598

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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