State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China.
Hubei Key Laboratory of Contaminated Clay Science & Engineering, Wuhan, 430071, China.
Environ Sci Pollut Res Int. 2018 Jul;25(19):18559-18569. doi: 10.1007/s11356-018-2053-8. Epub 2018 Apr 26.
Evaluation of oxygen distribution during aeration in landfill is significantly important to determine the design parameters of an injection well. A coupling model describing gas preferential transport in a landfill was developed, which linked the effect of advection-diffusion and oxidation reaction and mass exchange between the fracture and the matrix system. The quantitative simulation of the variation in gas distribution during vertical well aeration in short term was presented, combined with the typical cases in field site. The parameter sensitivity in the coupling model to gas transport was addressed. Simulation result of the oxygen and methane concentrations by using the dual advective-diffusive (DAD) model, which considered the immobile zone effect, was closer to the monitoring data than that by using single advective-diffusive model. The variation of the AR under aeration was presented with the key parameters to provide the theory evidence for gas well design in landfill. This study provided reference for the design of the gas injection well distribution in aerobic landfill.
评估填埋场充气过程中的氧气分布对于确定注气井的设计参数非常重要。本文开发了一个描述填埋场中气体优先传输的耦合模型，该模型将对流-扩散和氧化反应的影响以及裂缝与基质系统之间的质量交换联系起来。结合现场的典型案例，提出了短期垂直井充气过程中气体分布变化的定量模拟。讨论了耦合模型中对气体传输的参数敏感性。与只考虑单一的对流-扩散模型相比，考虑不可移动区影响的双对流-扩散（DAD）模型对氧气和甲烷浓度的模拟结果更接近监测数据。通过充气，提出了 AR 的变化与关键参数的关系，为填埋场中气体井设计提供了理论依据。该研究为好氧填埋场注气井分布的设计提供了参考。
