Hotspot Detection and Estimation of Methane Emissions from Landfill Final Cover

The main objectives of this study were to identify methane hotspots through spatial distribution tests of the surface methane concentration above a landfill final cover and to investigate the effects of rainfall, atmospheric pressure, ground temperature, and ambient methane concentration on methane...

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Main Authors: Tao Wu, Jiankang Cheng, Shifang Wang, Haijie He, Guannian Chen, Haoqing Xu, Silin Wu
Format: Article
Language:English
Published: MDPI AG 2023-10-01
Series:Atmosphere
Subjects:
Online Access:https://www.mdpi.com/2073-4433/14/11/1598
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author Tao Wu
Jiankang Cheng
Shifang Wang
Haijie He
Guannian Chen
Haoqing Xu
Silin Wu
author_facet Tao Wu
Jiankang Cheng
Shifang Wang
Haijie He
Guannian Chen
Haoqing Xu
Silin Wu
author_sort Tao Wu
collection DOAJ
description The main objectives of this study were to identify methane hotspots through spatial distribution tests of the surface methane concentration above a landfill final cover and to investigate the effects of rainfall, atmospheric pressure, ground temperature, and ambient methane concentration on methane emissions. A portable laser methane detector was used to measure the spatial distribution of methane concentrations. The methane concentration distribution showed a distinct spatial variability. The maximum methane concentration reached 3225 ppm, while 73.0% of the methane concentration values were below 10.0 ppm. Several meteorological factors were found to be associated with the variation in methane emissions. Rainfall limited gas transport in the cover, resulting in more significant methane hotspots. Atmospheric pressure was negatively correlated with methane emission. The ambient methane concentration and methane flux had a significant positive linear correlation. Based on a linear correlation equation, the spatial distribution of methane concentrations in the landfill could be converted into a methane emission distribution. The estimated average value for methane emissions in the test area was approximately 4.3 g m<sup>−2</sup> d<sup>−1</sup>. This study provides an experimental basis for locating methane hotspots and assessing methane emissions in landfill final covers, and proposes supplementary means for detecting geomembrane damage in landfill covers.
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spelling doaj.art-441e9dbd65db40349190f09c628b77812023-11-24T14:28:21ZengMDPI AGAtmosphere2073-44332023-10-011411159810.3390/atmos14111598Hotspot Detection and Estimation of Methane Emissions from Landfill Final CoverTao Wu0Jiankang Cheng1Shifang Wang2Haijie He3Guannian Chen4Haoqing Xu5Silin Wu6College of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212000, ChinaCollege of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212000, ChinaCollege of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, ChinaCollege of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, ChinaSchool of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, ChinaCollege of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212000, ChinaCollege of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212000, ChinaThe main objectives of this study were to identify methane hotspots through spatial distribution tests of the surface methane concentration above a landfill final cover and to investigate the effects of rainfall, atmospheric pressure, ground temperature, and ambient methane concentration on methane emissions. A portable laser methane detector was used to measure the spatial distribution of methane concentrations. The methane concentration distribution showed a distinct spatial variability. The maximum methane concentration reached 3225 ppm, while 73.0% of the methane concentration values were below 10.0 ppm. Several meteorological factors were found to be associated with the variation in methane emissions. Rainfall limited gas transport in the cover, resulting in more significant methane hotspots. Atmospheric pressure was negatively correlated with methane emission. The ambient methane concentration and methane flux had a significant positive linear correlation. Based on a linear correlation equation, the spatial distribution of methane concentrations in the landfill could be converted into a methane emission distribution. The estimated average value for methane emissions in the test area was approximately 4.3 g m<sup>−2</sup> d<sup>−1</sup>. This study provides an experimental basis for locating methane hotspots and assessing methane emissions in landfill final covers, and proposes supplementary means for detecting geomembrane damage in landfill covers.https://www.mdpi.com/2073-4433/14/11/1598methane emissionlandfill covergeomembranelaser methane detector
spellingShingle Tao Wu
Jiankang Cheng
Shifang Wang
Haijie He
Guannian Chen
Haoqing Xu
Silin Wu
Hotspot Detection and Estimation of Methane Emissions from Landfill Final Cover
Atmosphere
methane emission
landfill cover
geomembrane
laser methane detector
title Hotspot Detection and Estimation of Methane Emissions from Landfill Final Cover
title_full Hotspot Detection and Estimation of Methane Emissions from Landfill Final Cover
title_fullStr Hotspot Detection and Estimation of Methane Emissions from Landfill Final Cover
title_full_unstemmed Hotspot Detection and Estimation of Methane Emissions from Landfill Final Cover
title_short Hotspot Detection and Estimation of Methane Emissions from Landfill Final Cover
title_sort hotspot detection and estimation of methane emissions from landfill final cover
topic methane emission
landfill cover
geomembrane
laser methane detector
url https://www.mdpi.com/2073-4433/14/11/1598
work_keys_str_mv AT taowu hotspotdetectionandestimationofmethaneemissionsfromlandfillfinalcover
AT jiankangcheng hotspotdetectionandestimationofmethaneemissionsfromlandfillfinalcover
AT shifangwang hotspotdetectionandestimationofmethaneemissionsfromlandfillfinalcover
AT haijiehe hotspotdetectionandestimationofmethaneemissionsfromlandfillfinalcover
AT guannianchen hotspotdetectionandestimationofmethaneemissionsfromlandfillfinalcover
AT haoqingxu hotspotdetectionandestimationofmethaneemissionsfromlandfillfinalcover
AT silinwu hotspotdetectionandestimationofmethaneemissionsfromlandfillfinalcover