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Site-specific criteria for the completion of landfill aftercare

机译：完成填埋场善后处理的特定地点标准

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摘要

Municipal solid waste (MSW) landfills need to be managed after closure to assure long-term environmental compatibility. Aftercare can be completed when the authorities consider the landfill not likely to pose a threat to humans and the environment. In this work, a methodology for deriving site-specific aftercare completion criteria is presented and its application is illustrated via a case study. The evaluation method combines models addressing waste emission behavior, long-term barrier performance, and pollutant migration to assess the potential impact of landfill emissions on the environment. Based on the definition of acceptable impact levels at certain points of compliance, scenario- and pollutant-specific aftercare completion criteria are derived. The methodology was applied to a closed MSW landfill in Austria and potential aftercare durations were determined. While landfill gas emissions may become environmentally tolerable within decades at the site, leachate-related aftercare measures were expected to be necessary for centuries (primarily as a result of ammonium). Although the evaluation comes with large uncertainties, it allows for linking aftercare intensity and duration with respect to an environmentally compatible state of the landfill in the absence of aftercare. However, further case studies including regulatory review and acceptance are needed to use the methodology in a decision support tool on aftercare completion.
机译：封闭后需要对城市固体废物（MSW）垃圾填埋场进行管理，以确保长期的环境兼容性。当当局认为垃圾填埋场不太可能对人类和环境构成威胁时，便可以完成后期护理。在这项工作中，提出了一种方法，用于得出特定于场所的善后完成标准，并通过案例研究说明了其应用。该评估方法结合了处理废物排放行为，长期屏障性能和污染物迁移的模型，以评估垃圾填埋场排放对环境的潜在影响。根据在某些合规性点上可接受的影响水平的定义，得出特定于场景和污染物的善后完成标准。该方法已应用于奥地利封闭的城市生活垃圾填埋场，并确定了可能的善后时间。虽然该填埋场的气体排放在数十年之内在环境上可以容忍，但几个世纪以来（主要是由于铵的影响），预计与沥滤液有关的善后措施是必要的。尽管评估存在很大的不确定性，但它可以将后续维护的强度和持续时间与没有后续维护的垃圾填埋场的环境兼容状态联系起来。但是，需要进一步的案例研究，包括监管审查和验收，才能在完成护理后的决策支持工具中使用该方法。

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