Simulation of gas transport in a landfill with layered new and old municipal solid waste

Abstract Average biodegradation rate of newly filled municipal solid waste (MSW) in landfills is relatively fast, and the landfill gas produced by the new MSW biodegradation can cause great variations in gas pressure. To predict the gas pressure distribution in the MSW layer, a one-dimensional gas t...

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Autores principales:	Tao Zhang, Jianyong Shi, Xun Wu, Hai Lin, Xiulei Li
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/374ff16cf44546c1966d2f8cdf3d87ce
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spelling	oai:doaj.org-article:374ff16cf44546c1966d2f8cdf3d87ce2021-12-02T14:29:04ZSimulation of gas transport in a landfill with layered new and old municipal solid waste10.1038/s41598-021-88858-52045-2322https://doaj.org/article/374ff16cf44546c1966d2f8cdf3d87ce2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88858-5https://doaj.org/toc/2045-2322Abstract Average biodegradation rate of newly filled municipal solid waste (MSW) in landfills is relatively fast, and the landfill gas produced by the new MSW biodegradation can cause great variations in gas pressure. To predict the gas pressure distribution in the MSW layer, a one-dimensional gas transport model is established in this study. The following factors are considered in this model: (1) the variation of gas permeability with depth; (2) the anisotropy ratio of gas permeability; (3) the settlement caused by waste biodegradation. Furthermore, a single peak model for gas production is applied as the source term of gas production. The equation for settlement caused by waste biodegradation is presented, and the time of peak gas production rate is obtained by fitting the settlement of the newly filled layer. The stratification of the unsaturated and saturated regions is taken into account by distinguishing the difference in gas saturation. The layering of the new and old waste layers is considered by distinguishing the difference in the length of time that waste has been degraded to produce gas. Based on the method of numerical calculation, the gas pressure distribution in the landfill with layered new and old MSW is well simulated. The position where the maximum gas pressure occurs is found. The sensitivity analysis shows that the influence of the anisotropy ratio on gas pressure distribution is more significant.Tao ZhangJianyong ShiXun WuHai LinXiulei LiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tao Zhang Jianyong Shi Xun Wu Hai Lin Xiulei Li Simulation of gas transport in a landfill with layered new and old municipal solid waste
description	Abstract Average biodegradation rate of newly filled municipal solid waste (MSW) in landfills is relatively fast, and the landfill gas produced by the new MSW biodegradation can cause great variations in gas pressure. To predict the gas pressure distribution in the MSW layer, a one-dimensional gas transport model is established in this study. The following factors are considered in this model: (1) the variation of gas permeability with depth; (2) the anisotropy ratio of gas permeability; (3) the settlement caused by waste biodegradation. Furthermore, a single peak model for gas production is applied as the source term of gas production. The equation for settlement caused by waste biodegradation is presented, and the time of peak gas production rate is obtained by fitting the settlement of the newly filled layer. The stratification of the unsaturated and saturated regions is taken into account by distinguishing the difference in gas saturation. The layering of the new and old waste layers is considered by distinguishing the difference in the length of time that waste has been degraded to produce gas. Based on the method of numerical calculation, the gas pressure distribution in the landfill with layered new and old MSW is well simulated. The position where the maximum gas pressure occurs is found. The sensitivity analysis shows that the influence of the anisotropy ratio on gas pressure distribution is more significant.
format	article
author	Tao Zhang Jianyong Shi Xun Wu Hai Lin Xiulei Li
author_facet	Tao Zhang Jianyong Shi Xun Wu Hai Lin Xiulei Li
author_sort	Tao Zhang
title	Simulation of gas transport in a landfill with layered new and old municipal solid waste
title_short	Simulation of gas transport in a landfill with layered new and old municipal solid waste
title_full	Simulation of gas transport in a landfill with layered new and old municipal solid waste
title_fullStr	Simulation of gas transport in a landfill with layered new and old municipal solid waste
title_full_unstemmed	Simulation of gas transport in a landfill with layered new and old municipal solid waste
title_sort	simulation of gas transport in a landfill with layered new and old municipal solid waste
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/374ff16cf44546c1966d2f8cdf3d87ce
work_keys_str_mv	AT taozhang simulationofgastransportinalandfillwithlayerednewandoldmunicipalsolidwaste AT jianyongshi simulationofgastransportinalandfillwithlayerednewandoldmunicipalsolidwaste AT xunwu simulationofgastransportinalandfillwithlayerednewandoldmunicipalsolidwaste AT hailin simulationofgastransportinalandfillwithlayerednewandoldmunicipalsolidwaste AT xiuleili simulationofgastransportinalandfillwithlayerednewandoldmunicipalsolidwaste
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Simulation of gas transport in a landfill with layered new and old municipal solid waste

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