Contaminant Transport Through a Field-Scale Earthen Liner

9815242 PI：大卫·E·丹尼尔研究所：伊利诺伊大学厄巴纳-香槟分校标题：通过现场规模的泥土衬垫进行污染物传输摘要压实的细粒地质材料被广泛用于抑制废物封存设施中产生的渗滤液。由于现场压实土壤衬里的数据极其有限，分析性污染物传输模型的预测已通过实验室柱试验得到了广泛的评估。该项目将提供实地规模的关于通过压实土壤衬垫进行化学品运输的数据，污染物运输模型预测与实地规模数据之间的比较，以及对废物封存设施进行化学品运输分析的建议。该项目将利用伊利诺伊州地质调查局(ISGS)于1985年开始的长期实地研究。ISGS建造了一个压实土壤衬垫，其平面尺寸为8m×15m，厚度为0.9m。ISGS衬垫已被监测了大约10年，所产生的数据为研究压实土壤衬垫中化学物质的长期迁移和现有污染物迁移模型的性能提供了一个独特的机会。研究的主要部分包括：(A)压实土壤衬里的取样和挖掘，(B)土壤样本的化学分析以确定化学浓度随深度的变化，(C)地统计分析以量化通过衬砌的化学传输的空间变异性，(D)使用原始土壤衬垫材料测量现有化学传输模型所需的扩散系数、饱和水力传导性、有效孔隙率和其他参数，(E)最新的污染物传输分析并将结果与现场测量结果进行比较，以调查现有传输模型的性能/准确性，(F)量化平流和扩散对污染物通过压实土壤衬垫的迁移的重要性，并(G)为废物遏制设施进行化学运输分析提出建议。伊利诺伊州固体废物研究办公室已经为拟议的研究提供了匹配的资金。

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.