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首页> 外文期刊>Journal of Environmental Engineering >Influence of High-Permeability Layers for Enhancing Landfill Gas Capture and Reducing Fugitive Methane Emissions from Landfills
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Influence of High-Permeability Layers for Enhancing Landfill Gas Capture and Reducing Fugitive Methane Emissions from Landfills

机译：高渗透层对增强垃圾填埋场气体捕获和减少垃圾填埋场产生的甲烷排放的影响

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摘要

Gas collection systems of various designs have been used to control landfill gas emissions, which can be problematic, particularly before installation of final landfill covers. In this work, an innovative gas collection system that includes a permeable layer near the top surface of landfills was evaluated for enhancing capture of landfill gas and reducing fugitive methane emissions. A compu_tational model that accounts for advective and diffusive fluxes of multiple gas components was used to evaluate the efficiency of this new design for intermediate landfill covers. The utility of the high-permeability gas-conductive layer was illustrated for several conditions of interest including varying refuse permeability, varying degrees of permeability anisotropy, and temporal atmospheric pressure changes. Simulations showed that the permeable layer decreased methane emissions by 43% when the horizontal to vertical permeability ratio for refuse was k_h/k_v=3 and the domain average k_h=3 x 10~(-12) m~2, while reductions in methane emissions decreased to 17% for the same anisotropy but with k_h=10~(-11) m~2. With this design, barometric pressure changes did not significantly affect oxygen intrusion or methane emission rates.
机译：已经使用各种设计的气体收集系统来控制垃圾填埋气体的排放，这可能是个问题，特别是在安装最终的垃圾填埋场之前。在这项工作中，对一种创新的气体收集系统进行了评估，该系统包括在垃圾填埋场顶面附近的可渗透层，以增强垃圾填埋场的捕获能力并减少散逸的甲烷排放。使用一个计算模型，该模型考虑了多种气体组分的对流和扩散通量，以评估这种新设计对中间垃圾掩埋场的效率。举例说明了高渗透性气体传导层在多种关注条件下的实用性，这些条件包括变化的垃圾渗透率，变化的渗透率各向异性程度和瞬时大气压变化。模拟表明，当垃圾的水平与垂直渗透率比为k_h / k_v = 3且区域平均k_h = 3 x 10〜（-12）m〜2时，可渗透层将甲烷排放量降低43％，而甲烷排放量减少在相同的各向异性但k_h = 10〜（-11）m〜2的情况下降低到17％。通过这种设计，大气压力的变化不会显着影响氧气的入侵或甲烷的排放速率。

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