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Balance Between Cover Resistance and Pump Capacity for Designing Vertical Gas Wells

  • Qi-Teng Zheng
  • R. Kerry Rowe
  • Shi-Jin FengEmail author
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Considering exponential decreases in landfill gas (LFG) generation and gas permeability of waste with depth, a design method for vertical gas well spacing to achieve a 90% recovery rate is proposed through a quantitative analysis of over 500,000 scenarios calculated using a normalized analytical solution. Both increasing cover resistance and pump capacity can allow an increase in the well spacing while maintaining a 90% recovery rate but may result in a maximum gas pressure below the cover ranging from −5 kPa to tens of kPa. A balance between cover and pump effects is to be achieved in this paper by constraining a maximum gas pressure of 1 kPa below the cover and a recovery rate of 90%. With this goal, the design cover resistance is shown to be strongly related to LFG generation and vertical gas permeability at the top of the waste and the non-homogeneity of LFG generation with depth, but is independent of vacuum pressure and non-homogeneity of gas permeability with depth. A chart suitable for designing to meet these objectives is proposed and illustrated by a practical application.

Keywords

Landfill Waste non-homogeneity Vertical gas well Maximum cover-gas pressure Design 

References

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Department of Geotechnical EngineeringTongji UniversityShanghaiChina
  2. 2.GeoEngineering Centre at Queen’s-RMC, Department of Civil EngineeringQueen’s UniversityKingstonCanada

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