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首页> 外文会议>1998 Joint Conference on the Environment, 1998, Mar 31-Apr 1, 1998, Albuquerque, NM >A Surfactant - Modified Zeolite Permeable Barrier for the Remediation of Chrome and PCE : Pilot Study Results
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A Surfactant - Modified Zeolite Permeable Barrier for the Remediation of Chrome and PCE : Pilot Study Results

机译：表面活性剂改性的沸石渗透性屏障对铬和PCE的修复：初步研究结果。

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The fact that no contaminant has migrated through the barrier indicates that significant retardation of the contaminants is occurring. Based on the most recent picture of PCE distribution at the site, initial estimates of the retardation of PCE are between 15 and 20. Since chromate has not yet been seen in the barrier, it is assumed to be considerably retarded by the SMZ and have a value of retardation that is higher than that of PCE. Overall, the barrier material seems to be performing reasonably well with respect to the retardation of both contaminants. However, the deflection of mass below the barrier was not anticipated previous to contaminant injection. System design parameters could be adversely affecting the flow of water through and around the barrier. Preferential flow of water may be occurring at spatially discrete permeability interfaces such as the location where the base of the barrier contacts the aquifer material, or where the barrier mates to the side wall of the aquifer. Other parameters intrinsic to the materials such as wettability, heterogeneity, and compressibility could be playing a role which, to date, is unknown. Further work is being done on site to isolate and address the system variables that are causing deflection around the barrier. SMZ as a permeable barrier material in this pilot test is an efficient sorbent substrate for inorganic oxyanions and chlorinated hydrocarbons. Since injection of contaminant in the synthetic aquifer, no contaminant has migrated through the barrier. The unrealistically high water flux through the aquifer, coupled with the fact that the SMZ barrier has stopped the migration of the contaminants of interest, indicates that it could retard the migration of contaminants from a contaminanted field site with a natural gradient flux for a considerably long period of time.
机译：没有污染物迁移通过屏障的事实表明正在发生污染物的显着延迟。根据现场PCE分布的最新图片，PCE延迟的初始估计值在15到20之间。由于尚未在屏障中看到铬酸盐，因此假定SMZ对其有相当大的延迟，并且铬酸盐具有延迟值高于PCE。总体而言，阻隔材料在两种污染物的阻滞方面似乎表现良好。但是，在注入污染物之前，没有预料到屏障下方的质量会发生偏转。系统设计参数可能会对通过屏障及其周围的水流产生不利影响。水的优先流动可能发生在空间离散的渗透性界面上，例如屏障的底部接触含水层材料的位置，或者屏障与含水层的侧壁配合的位置。材料固有的其他参数，如润湿性，非均质性和可压缩性，可能起着迄今未知的作用。目前正在现场做进一步的工作，以隔离和解决导致障碍物偏转的系统变量。在本试验中，SMZ作为可渗透阻隔材料是无机含氧阴离子和氯代烃的有效吸附剂。由于在合成含水层中注入了污染物，因此没有污染物迁移过屏障。通过含水层的水流量极高，再加上SMZ屏障已阻止了感兴趣的污染物的迁移，这表明它可以在很长的自然梯度时间内阻止污染物从污染的现场迁移。一段的时间。

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