A gas flow model for layered landfills with vertical extraction wells

Waste Management
Shi-Jin FengHai-Jian Xie

Abstract

This paper developed a two-dimensional axisymmetric analytical model for layered landfills with vertical wells. The model uses a horizontal layered structure to describe the waste non-homogeneity with depth in gas generation, permeability and temperature. The governing equations in the cylindrical coordinate system were transformed to dimensionless forms and solved using a method of eigenfunction expansion. After verification, the effects of different well boundary conditions and gas extraction systems on recovery efficiency were investigated. A dimensionless double-layer system, consisting of a cover and a waste layer, was also explored. The results show that a constant vacuum pressure boundary condition can be enough to describe a perforated pipe surrounded by drainage gravel with a reasonable value of well radius, such as half the radius of gravel fill. Also, the 7 independent variables (one marked with an asterisk is dimensionless) of a double-layer system can be integrated into 3 dimensionless ones: Cover permeability Kv1∗/(Vertical gas permeability of waste Kv2∗×Cover thickness h1∗),-Vacuum pressure pw×PatmKv2∗/(μRgT2×Gas generation rate of waste s2) and ln(Well radius rw∗)/(Anisotropy degree of waste k2∗). The integratio...Continue Reading

References

Apr 10, 2009·Journal of Hazardous Materials·Li YuAntonio Lloret
Apr 16, 2010·Waste Management·Guillaume StoltzLaurent Oxarango
Aug 25, 2010·Journal of Contaminant Hydrology·Guillaume StoltzLaurent Oxarango

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Citations

Sep 2, 2020·Environmental Science and Pollution Research International·Shi-Jin FengQi-Teng Zheng
Mar 25, 2021·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Shi ShuJianyong Shi

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