Axisymmetric gas flow model for bioreactor landfills incorporating MSW compression and leachate recirculation

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• 作者：Shi-Jin Feng ; Qi-Teng Zheng ; Hai-Jian Xie
• 关键词：Bioreactor landfills ; Gas flow ; Numerical analysis ; MSW compression ; Leachate recirculation
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：75
• 期：1
• 全文大小：1,308 KB
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• 作者单位：Shi-Jin Feng (1)
  Qi-Teng Zheng (1)
  Hai-Jian Xie (2)
  
  1. Department of Geotechnical Engineering, Tongji University, Si Ping Road 1239, Shanghai, 200092, China
  2. Institute of Hydrology and Water Resources Engineering, Zhejiang University, Hangzhou, 310058, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

To control the landfill gas (LFG) emission, LFG collection systems with vertical wells are extensively used in municipal solid waste (MSW) landfills. When investigating the LFG flow behavior, the solid鈥搇iquid鈥揼as interactions cannot be neglected, especially in bioreactor landfills. In this study, an axisymmetric numerical model incorporating MSW compression and leachate recirculation was developed to describe the transient gas flow in bioreactor landfills. In the model, the porosity distribution was evaluated through circular computations, and the temporal and spatial changes in moisture were determined using the unsaturated鈥搒aturated seepage flow model. Based on these calculations, the governing equations of gas migration were solved using the finite element method. The influences of MSW properties, recirculation rate and well vacuum pressure were then investigated. The results show that the MSW compression and leachate recirculation have a significant impact on the distributions of gas generation, permeability and pressure. As the recirculation rate increases from 1 to 9 mm day鈭?, the gas permeability can decrease about 1 order of magnitude and thus the radius of influence decreases from 39 to 31 m. It is important to keep a balance between the acceleration of landfill stability and the recovery efficiency of LFG. These results provide helpful guidelines for the design of leachate recirculation and LFG control systems. Keywords Bioreactor landfills Gas flow Numerical analysis MSW compression Leachate recirculation