This paper describes the results of a benchscale testing program to assess the efficacy of a reactive core mat (RCM) for short term isolation and partial remediation of contaminated, subaqueous sediments. The 1.25 cm thick RCM (with a core reactive material such as organoclay with filtering layers on top and bottom) is placed on the sediment, and approximately 7.5 - 10 cm of overlying soil is placed on the RCM for stability and protection. A set of experiments were conducted to measure the sorption characteristics of the mat core (organoclay) and sediment used in the experiments, and to determine the fate of semi-volatile organic contaminants and non-reactive tracers through the sediment and reactive mat. The experimental study was conducted on naphthalene-spiked Neponset River (Milton, MA) sediment. The results show nonlinear sorption behavior for organoclay, with sorption capacity increasing with increasing naphthalene concentration. Neponset River sediment showed a notably high sorption capacity, likely due to the relatively high organic carbon fraction (14%). The fate and transport experiments demonstrated the short term efficiency of the reactive mat to capture the contamination that is associated with the post-capping period during which the highest consolidation-induced advective flux occurs, driving solid particles, pore fluid and soluble contaminants toward the reactive mat. The goal of the mat placement is to provide a physical filtering and chemically reactive layer to isolate contamination from the overlying water column. An important finding is that because of the high sorption capacity of the Neponset River sediment, the physical filtering capability of the mat is as critical as its chemical reactive capacity.

中文翻译：

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反应性核心垫分离多环芳烃水生沉积物功效的基准评估。

本文描述了用于评估反应性芯垫 (RCM) 在短期隔离和部分修复受污染的水下沉积物方面的功效的基准测试计划的结果。将 1.25 厘米厚的 RCM（带有顶部和底部过滤层的有机粘土等核心反应材料）放置在沉积物上，并在 RCM 上放置大约 7.5 - 10 厘米的上覆土壤以保持稳定和保护。进行了一组实验来测量实验中使用的垫芯（有机粘土）和沉积物的吸附特性，并确定半挥发性有机污染物和非反应性示踪剂通过沉积物和反应垫的归宿。实验研究是在掺有萘的 Neponset 河（马萨诸塞州米尔顿）沉积物中进行的。结果显示有机粘土的非线性吸附行为，吸附容量随着萘浓度的增加而增加。Neponset 河沉积物显示出非常高的吸附能力，这可能是由于有机碳含量相对较高 (14%)。归宿和传输实验证明了反应垫捕获与封盖后时期相关的污染物的短期效率，在此期间发生最高固结诱导的平流通量，将固体颗粒、孔隙流体和可溶性污染物推向反应堆垫。垫子放置的目的是提供物理过滤和化学反应层，以将污染物与上覆水柱隔离。一个重要的发现是，由于 Neponset 河沉积物的高吸附能力，