BRGM, Orléans, France.
Waste Manag Res. 2011 Jan;29(1):77-88. doi: 10.1177/0734242X10388348. Epub 2010 Nov 15.
The controlled landfill technology is now adopting passive attenuation techniques as an increasing number of landfill sites reach the post-closure phase. During the post-closure phase, landfill operators need to convince environmental authorities that landfills no longer pose a threat to health or the environment. The demonstration of acceptable risk should rely in particular on data collected during environmental monitoring in addition to modelling of possible future evolutions of environmental concentrations. One difficulty that is typically encountered in France is related to the fact that groundwater monitoring systems around landfills are often insufficiently detailed to provide conclusive evidence of natural attenuation mechanisms. This paper presents data on groundwater quality in the vicinity of an old landfill located in a complex aquifer system. While isotopic data show a signature of the landfill leachate in the groundwater in the vicinity of the landfill, chemical analyses do not suggest a strong influence, which could be indicative of natural attenuation mechanisms in the groundwater. However, the complexity of the groundwater system in this area is such that it cannot be excluded that a pollutant flux is being overlooked. Implications of demonstrating natural attenuation during the landfill post-closure phase, with respect to groundwater monitoring, are discussed.
现在，随着越来越多的垃圾填埋场进入封场后期，受控填埋技术正在采用被动衰减技术。在封场后期，垃圾填埋场运营商需要向环境主管部门证明垃圾填埋场不再对健康或环境构成威胁。证明可接受的风险尤其应该依赖于环境监测期间收集的数据，以及对环境浓度可能未来演变的建模。法国通常遇到的一个困难是，垃圾填埋场周围的地下水监测系统往往不够详细，无法提供自然衰减机制的确凿证据。本文介绍了位于复杂含水层系统中的旧垃圾填埋场附近地下水质量的数据。尽管同位素数据显示在垃圾填埋场附近的地下水中存在垃圾渗滤液的特征，但化学分析并未表明有强烈的影响，这可能表明地下水存在自然衰减机制。然而，该地区地下水系统的复杂性使得不能排除污染物通量被忽视的可能性。本文讨论了在垃圾填埋场封场后期展示自然衰减时，地下水监测的意义。
