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首页> 外文期刊>Journal of the air & waste management association >Modeling methane oxidation in landfill cover soils as indicator of functional stability with respect to gas management
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Modeling methane oxidation in landfill cover soils as indicator of functional stability with respect to gas management

机译：模拟掩埋土壤中的甲烷氧化，作为气体管理方面功能稳定性的指标

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A performance-based method for evaluating methane (CH4) oxidation as the best available control technology (BACT) for passive management of landfill gas (LFG) was applied at a municipal solid waste (MSW) landfill in central Washington, USA, to predict when conditions for functional stability with respect to LFG management would be expected. The permitted final cover design at the subject landfill is an all-soil evapotranspirative (ET) cover system. Using a model, a correlation between CH4 loading flux and oxidation was developed for the specific ET cover design. Under Washington's regulations, a MSW landfill is functionally stable when it does not present a threat to human health or the environment (HHE) at the relevant point of exposure (POE), which was conservatively established as the cover surface. Approaches for modeling LFG migration and CH4 oxidation are discussed, along with comparisons between CH4 oxidation and biodegradation of non-CH4 organic compounds (NMOCs). The modeled oxidation capacity of the ET cover design is 15 g/m(2)/day under average climatic conditions at the site, with 100% oxidation expected on an annual average basis for fluxes up to 8 g/m(2)/day. This translates to a sitewide CH4 generation rate of about 260 m(3)/hr, which represents the functional stability target for allowing transition to cover oxidation as the BACT (subject to completion of a confirmation monitoring program). It is recognized that less than 100% oxidation might occur periodically if climate and/or cover conditions do not precisely match the model, but that residual emissions during such events would be de minimis in comparison with published limit values. Accordingly, it is also noted that nonzero net emissions may not represent a threat to HHE at a POE (i.e., a target flux between 8 and 15 g/m(2)/day might be appropriate for functional stability) depending on the site reuse plan and distance to potential receptors. Implications: This study provides a scientifically defensible method for estimating when methane oxidation in landfill cover soils may represent the best available control technology for residual landfill gas (LFG) emissions. This should help operators and regulators agree on the process of safely eliminating active LFG controls in favor of passive control measures once LFG generation exhibits asymptotic trend behavior below the oxidation capacity of the soil. It also helps illustrate the potential benefits of evolving landfill designs to include all-soil vegetated evapotranspirative (ET) covers that meet sustainability objectives as well as regulatory performance objectives for infiltration control.
机译：在美国华盛顿市中心的城市生活垃圾（MSW）垃圾填埋场中，采用了一种基于性能的方法来评估甲烷（CH4）氧化，作为对垃圾填埋气（LFG）进行被动管理的最佳可用控制技术（BACT），以预测何时LFG管理的功能稳定性的条件是可以预期的。主题垃圾填埋场允许的最终覆盖设计是全土壤蒸发蒸腾（ET）覆盖系统。使用该模型，针对特定的ET盖设计开发了CH4负载通量和氧化之间的相关性。根据华盛顿州的规定，MSW垃圾填埋场在相关的暴露点（POE）不会对人类健康或环境（HHE）构成威胁时，其功能是稳定的，POE被保守地确定为覆盖面。讨论了建模LFG迁移和CH4氧化的方法，以及CH4氧化与非CH4有机化合物（NMOC）生物降解之间的比较。在现场平均气候条件下，ET盖设计的模拟氧化能力为15 g / m（2）/天，对于通量高达8 g / m（2）/天的通量，预计每年平均氧化100％ 。这转化为整个站点的CH4生成速率约为260 m（3）/ hr，这表示功能稳定性目标，允许过渡为覆盖BACT的氧化（取决于确认监测程序的完成）。公认的是，如果气候和/或覆盖条件与模型不完全匹配，则可能会周期性地发生少于100％的氧化，但是与已发布的限值相比，此类事件期间的残留排放量将最小。因此，还应注意，非零净排放量可能并不代表对POE处的HHE构成威胁（即，目标通量在8到15 g / m（2）/天之间可能适合功能稳定性），具体取决于站点的再利用计划和与潜在受体的距离。启示：这项研究提供了一种科学上可行的方法来估算何时垃圾掩埋土壤中的甲烷氧化代表了可用于残留垃圾填埋气（LFG）排放的最佳控制技术。一旦LFG产生在土壤氧化能力以下表现出渐近趋势行为，这应该有助于运营商和监管者就安全消除LFG主动控制的过程达成一致，而采取被动控制措施。它还有助于说明不断发展的垃圾填埋场设计的潜在好处，包括满足可持续性目标以及渗透控制法规性能目标的全土壤植被蒸发蒸腾（ET）覆盖物。

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