Factors affecting gas closure capacity of enhanced gas collection cover and optimized arrangement

被引：0
|
作者：
Li G. [1 ,2 ,3 ]
Liu S. [1 ]
Li H. [4 ]
Zhan L. [2 ]
Xia M. [2 ]
机构：
[1] Key Laboratory of Urban and Engineering Safety and Disaster Reduction of Ministry of Education, Beijing University of Technology, Beijing
[2] MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou
[3] Chongqing Research Institute of Beijing University of Technology, Chongqing
[4] The Architectural Design and Research Institute, Zhejiang University Limited Company, Hangzhou
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2024年 / 58卷 / 01期
关键词：
arrangement spacing of gas collection pipes; enhanced gas collection cover (EGCC); landfill gas; municipal solid waste landfill; optimized arrangement;
D O I：
10.3785/j.issn.1008-973X.2024.01.013
中图分类号：
学科分类号：
摘要：
Enhanced gas collection cover (EGCC) was proposed in order to achieve efficient gas collection from municipal solid waste landfills in China and eliminate environmental pollution and personal safety issues caused by the disorderly release of landfill gas. This facility from top to bottom includes a HDPE geomembrane, gas collection pipes and a soil regulating layer. The Air/W module in Geo-studio software was used to analyze the gas closure performance of the EGCC and relevant influencing factors. Results show that the inherent permeability of the soil regulating layer, the extraction pressure within the gas collection pipes, and the thickness of the landfilled waste are three main factors that affect the gas closure performance of the EGCC. The maximum pressure under the HDPE geomembrane increases with the decrease in the inherent permeability of the soil regulating layer, the increase in the extraction pressure within the gas collection pipes and the increase in the thickness of the landfilled waste. A formula for estimating the arrangement spacing of the gas collection pipes based on the soil regulating layer and the extraction pressure within the gas collection pipes was proposed. It is recommended that preference should be given to locally available medium sand or coarser soils as soil regulating layers. Xiaping Landfill in Shenzhen had achieved a 7-fold increase in landfill gas collection rate from 2014 to 2019 after adopting the EGCC combined with multiple gas extraction wells, with a landfill gas collection efficiency increasing from less than 30% to over 90%. © 2024 Zhejiang University. All rights reserved.
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页码：121 / 129
页数：8
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