Concept of subaqueous capping of contaminated sediments with active barrier systems (ABS) using natural and modified zeolites
Concept of subaqueous capping of contaminated sediments with active barrier systems (ABS) using natural and modified zeolites
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DOI：
10.1016/s0043-1354(98)00432-1
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发表时间：
1999-06-01
期刊：
影响因子：
12.8
通讯作者：
Förstner, U
中科院分区：
文献类型：
--
作者：
Jacobs, PH;Förstner, U
在这项研究中，提出了利用主动屏障系统（ABS）对湖泊、河流和沿海水域受污染沉积物进行水下封盖的概念，以尽量减少污染物释放到地表水中。这一概念有望为水保护的传统方法提供一种低成本的替代方案。主动屏障系统，即基于低成本材料的反应性地球化学屏障，应主动抑制污染物从沉积物释放到地表水中，而不干扰沉积物和地表水之间的水力接触。关于四种不同沸石岩石保留 Pb2+ 的理论考虑和初步实验结果表明，天然沸石作为沉积物覆盖中的反应材料满足主动屏障概念提出的所有经济和技术要求。天然沸石能够通过吸附作用去除大量阳离子污染物，如 Pb2+ 所示，此外，当用阳离子表面活性剂对沸石表面进行预处理时，它们能够去除非极性有机物和阴离子污染物。因此，基于天然沸石的主动屏障系统可以应用于几乎任何类型的污染沉积物。此外，沸石岩石的物理特性（如粒度和密度）有利于它们在水下应用中的使用。 (C) 1999 Elsevier Science Ltd. 保留所有权利。
In this study the concept of subaqueous capping of contaminated sediments of lakes, rivers and coastal waters with active barrier systems (ABS) in order to minimise the contaminant release into the surface water is developed. This concept is supposed to provide a low-cost alternative to conventional methods in water protection. Active barrier systems, i.e. reactive geochemical barriers on the basis of low-cost materials, shall actively inhibit contaminant release from the sediment into the surface water, without the hydraulic contact between sediment and surface water being disturbed. Theoretical considerations and first experimental results regarding the retention of Pb2+ by four different zeolitic rocks suggest that natural zeolite as a reactive material in sediment capping meets all the economical and technical requirements posed by the active barrier concept. Natural zeolites are capable of demobilising large amounts of cationic pollutants by sorption, as shown for Pb2+, and, furthermore, they are capable of demobilising non-polar organics and anionic contaminants, when the zeolite surface is pretreated with cationic surfactants. Active barrier systems on the basis of natural zeolites thus can be applied to nearly any type of contaminated sediment. Additionally, the physical characteristics of zeolitic rocks, as grain size and density, facilitate their use in subaqueous applications. (C) 1999 Elsevier Science Ltd. All rights reserved.