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地下污染质吸附系统(SSS)是指在含水层中能够增加孔隙介质对污染质吸附的地带。这些地带可以使污染质的运移性能减少3个数量级,因此,可以延缓污染质的运移和降低下游水中污染质的最高浓度。减缓污染质的活动性有可能有充足的时间使微生物和非生物降解发生。已有一些研究者在吸附带中使用了阳离子表面活化剂,但使用这些活化剂也存在着一些限制,如阳离子交换面积、有限的污染质吸附能力和它们的生物活动性。本文研究了用非毒性,非水溶,非水相液体(NAPL)形成SSS_s的可能性。本文在砂层中注入吸附剂(SNAPL),当达到部分饱和时进行实验。在吸附带内,对SNAPL的残余饱和度,水相相对渗透率和非水溶性有机污染质的吸附效果进行了分析,并在实验系统中建立了一个有效的SSS。此外,本文还引入了“有效阻滞”的概念进行研究,这一概念的引入,对实验系统的模拟可以用一系列的参数来表达。如残余SNAPL的饱和度,分配系数和渗透率。
Underground pollutant adsorption system (SSS) refers to the aquifer can increase the porous media adsorption of pollutants in the zone. These zones can reduce the transport capacity of pollutants by three orders of magnitude, thus retarding the transport of pollutants and reducing the maximum concentration of pollutants in downstream waters. Mitigating the activity of pollutants There may be sufficient time to allow microbial and non-biological degradation to occur. Some investigators have used cationic surfactants in the sorbent bands, but there are some limitations with the use of these activators, such as cation exchange capacity, limited ability to adsorb pollutants, and their biological activity. This article investigates the possibility of forming SSS_s with a non-toxic, non-aqueous, non-aqueous liquid (NAPL). In this paper, the adsorbent (SNAPL) is injected into the sand bed and the experiment is carried out when the partial saturation is reached. In the adsorption zone, the residual saturation of SNAPL, the relative permeability of water phase and the adsorption effect of non-water-soluble organic pollutants were analyzed, and an effective SSS was established in the experimental system. In addition, this article also introduces the concept of “effective block” to study. The introduction of this concept, the simulation of the experimental system can be expressed by a series of parameters. Such as the saturation of residual SNAPL, partition coefficient and permeability.