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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Enhanced removal of NAPL constituent from aquifer during surfactant flushing with aqueous hydraulic barriers of high viscosity
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Enhanced removal of NAPL constituent from aquifer during surfactant flushing with aqueous hydraulic barriers of high viscosity

机译：在表面活性剂用高粘度水硬性屏障冲洗时，可从含水层中去除NAPL成分

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This study examines the effect of controlled groundwater flow paths induced by hydraulic barriers on the removal of NAPL constituent. An aqueous solution of thickener [0.05% (w/v) sodium carboxymethyl cellulose, SCMC] was continuously injected into a horizontally set two-dimensional physical model (sand-packed), forming aqueous plume(s) of high viscosity. The water flux at the down gradient of the model was measured using a flux tracer (n-octanol) and passive flux meter (PFM, packs of granular activated carbon). A non-reactive tracer (pentafluorobenzoic acid, PFBA) was used to identify the plume of high viscosity (hydraulic barrier) and ambient groundwater. When the barrier of high viscosity was formed, the plume was separated from the background water with little mixing, which was confirmed by the concentration profile of PFBA; whereas, the measured flux of ambient groundwater showed a distinctive distribution, due to the hydraulic barrier. When two barriers were set, the ambient water flux was enhanced in the middle, and the removal rate of PCE from the non-aqueous phase liquid (NAPL), measured by PFM, was found to improve by 26% during three hours of water flushing. When an aqueous solution of surfactant [0.37% (w/v), sodium dodecyl sulfate, SDS] was applied instead of water into the domain with two barriers set around the NAPL-contaminated spot, the removal of PCE from the NAPL increased by 101% for a three-hour time period. Based on the observations made in this study, hydraulic barriers formed by continuous injection of thickener solution change the flow direction of groundwater, and may increase the flux of groundwater (or aqueous solution of remediation agent) through a NAPL-contaminated region, improving the removal of NAPL.
机译：这项研究探讨了由水力屏障引起的受控地下水流径对去除NAPL成分的影响。将增稠剂的水溶液[0.05％（w / v）羧甲基纤维素钠，SCMC]连续注入到水平设置的二维物理模型中（填充沙子），形成高粘度的水羽流。使用通量示踪剂（正辛醇）和无源通量计（PFM，成组的颗粒状活性炭）测量模型向下梯度的水通量。使用非反应性示踪剂（五氟苯甲酸，PFBA）来识别高粘度羽流（液压屏障）和周围地下水。当形成高粘度的屏障时，几乎没有混合的情况下将羽状物从背景水中分离出来，这可以通过PFBA的浓度曲线得到证实。然而，由于水力屏障，测得的周围地下水通量显示出独特的分布。设置两个屏障后，中间的水通量增加，并且在冲洗三个小时的过程中，通过PFM测量，从非水相液体（NAPL）中去除PCE的速率提高了26％ 。当将表面活性剂[0.37％（w / v），十二烷基硫酸钠，SDS]的水溶液代替水应用到具有在NAPL污染点周围设置两个屏障的区域时，从NAPL中去除PCE增加101三个小时的时间百分比。根据这项研究的观察结果，连续注入增稠剂溶液形成的水力屏障会改变地下水的流动方向，并可能增加通过NAPL污染区的地下水（或修复剂水溶液）的通量，从而改善去除效果。 NAPL。

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