利用气相示踪剂试验来表征垃圾填埋气生成对渗流区挥发性有机化合物平流-弥散输运的影响。
Using a Gas-Phase Tracer Test to Characterize the Impact of Landfill Gas Generation on Advective-Dispersive Transport of VOCs in the Vadose Zone.
作者信息
Monger Gregg R, Duncan Candice Morrison, Brusseau Mark L
机构信息
Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, University of Arizona, 429 Shantz Bldg., Tucson, AZ 85721.
Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, University of Arizona, 429 Shantz Bldg., Tucson, AZ 85721 ; Hydrology and Water Resources Department, School of Earth and Environmental Sciences, University of Arizona, 429 Shantz Bldg., Tucson, AZ 85721.
出版信息
Water Air Soil Pollut. 2014 Dec;225. doi: 10.1007/s11270-014-2226-0.
A gas-phase tracer test (GTT) was conducted at a landfill in Tucson, AZ, to help elucidate the impact of landfill gas generation on the transport and fate of chlorinated aliphatic volatile organic contaminants (VOCs). Sulfur hexafluoride (SF) was used as the non-reactive gas tracer. Gas samples were collected from a multiport monitoring well located 15.2 m from the injection well, and analyzed for SF, CH, CO, and VOCs. The travel times determined for SF from the tracer test are approximately two to ten times smaller than estimated travel times that incorporate transport by only gas-phase diffusion. In addition, significant concentrations of CH and CO were measured, indicating production of landfill gas. Based on these results, it is hypothesized that the enhanced rates of transport observed for SF are caused by advective transport associated with landfill gas generation. The rates of transport varied vertically, which is attributed to multiple factors including spatial variability of water content, refuse mass, refuse permeability, and gas generation.
在亚利桑那州图森市的一个垃圾填埋场进行了气相示踪试验（GTT），以帮助阐明垃圾填埋气产生对氯化脂肪族挥发性有机污染物（VOCs）迁移和归宿的影响。六氟化硫（SF）被用作非反应性气体示踪剂。从位于距注入井15.2米处的多端口监测井采集气体样本，并对其进行SF、CH、CO和VOCs分析。示踪试验确定的SF运移时间比仅考虑气相扩散传输的估计运移时间大约小两到十倍。此外，还测量到了显著浓度的CH和CO，表明有垃圾填埋气产生。基于这些结果，推测观察到的SF增强传输速率是由与垃圾填埋气产生相关的平流传输引起的。传输速率在垂直方向上有所变化，这归因于多种因素，包括含水量、垃圾质量、垃圾渗透率和气体产生的空间变异性。
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