Contaminant Transport Through a Field-Scale Earthen Liner

9815242 PI：大卫E.丹尼尔机构：伊利诺伊大学厄巴纳-香槟分校标题：污染物通过现场规模的土制衬垫的传输摘要压实的细粒地质材料被广泛用于抑制废物遏制设施产生的浸出液。 污染物迁移分析模型的预测已被广泛使用实验室柱试验进行评估，因为现场规模的压实土壤衬垫的数据是非常有限的。 该项目将提供关于通过压实土壤衬垫的化学品迁移的实地规模数据，污染物迁移模型预测与实地规模数据之间的比较，以及对废物封闭设施进行化学品迁移分析的建议。 该项目将利用伊利诺伊州地质调查局（ISGS）于1985年开始的长期实地规模研究。 ISGS建造了一个压实的土壤衬垫，并对其进行了大量的仪器测量，其平面尺寸为8 m x 15 m，厚度为0.9 m。 ISGS衬垫已经监测了大约十年，由此产生的数据提供了一个独特的机会，研究通过压实土壤衬垫的长期化学品运输和现有污染物运输模型的性能。 研究的主要组成部分是：（a）对压实的土壤衬垫进行取样和挖掘，（B）对土壤样品进行化学分析，以确定化学品浓度随深度的变化，（c）地质统计学分析，以量化通过衬垫的化学品迁移的空间变化，（d）测量扩散系数、饱和导水率、有效孔隙度，和使用原始土壤衬垫材料的现有化学迁移模型所需的其他参数，（e）最新污染物迁移分析和结果与实地规模测量的比较，以调查现有迁移模型的性能/准确性，（f）量化平流和扩散对污染物通过压实土壤衬里迁移的重要性，以及（g）制定对废物密封设施进行化学迁移分析的建议。 伊利诺伊州固体废物研究办公室为拟议的研究提供了配套资金。

9815242 PI: David E. Daniel Institution: University of Illinois at Urbana-Champaign Title: Contaminant Transport Through a Field-scale Earthen Liner ABSTRACT Compacted fine-grained geologic materials are widely used to restrain leachate generated at waste containment facilities. The predictions of analytical contaminant transport models have been widely evaluated using laboratory column tests because data from field-scale compacted soil liners is extremely limited. This project will provide field-scale data on chemical transport through compacted soil liners, a comparison between contaminant transport model predictions and field-scale data, and recommendations for conducting chemical transport analyses for waste containment facilities. This project will utilize the long-term field-scale study that the Illinois State Geological Survey (ISGS) started in 1985. The ISGS constructed and heavily instrumented a compacted soil liner, with plan dimensions of 8 m x 15 m and a thickness of 0.9 m. The ISGS liner has been monitored for approximately ten years, and the resulting data provides a unique opportunity to study the long-term chemical transport through a compacted soil liner and the performance of existing contaminant transport models. The main components of the research are: (a) sampling and excavation of the compacted soil liner, (b) chemical analysis of the soil samples to determine the variation of chemical concentration versus depth, (c) geostatistical analysis to quantify the spatial variability of chemical transport through the liner, (d) measurement of diffusion coefficient, saturated hydraulic conductivity, effective porosity, and other parameters required by existing chemical transport models using the original soil liner material, (e) state-of-the-art contaminant transport analyses and comparison of the results to field-scale measurements to investigate the performance/accuracy of existing transport models, (f) quantify the importance of advection and diffusion on contaminant migration through the compacted soil liner, and (g) develop recommendations for conducting chemical transport analyses for waste containment facilities. The Illinois Office of Solid Waste Research has provided matching funds for the proposed research.