• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Transport of contaminants in vertical barriers: Enhancement of barrier performance with sorptive and reactive additives.
【24h】

Transport of contaminants in vertical barriers: Enhancement of barrier performance with sorptive and reactive additives.

机译：垂直屏障中污染物的传输：吸附性和反应性添加剂可增强屏障性能。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Subsurface containment for environmental applications has received widespread attention as possible alternative to conventional remediation. Containment systems commonly consist of vertical barriers surrounding the area containing hazardous material. In this study, contaminant transport models are developed and tested for the analysis and design of vertical barriers. These models are developed for diffusion-dominated transport through low-permeability vertical barriers and advection-dominated transport through permeable reactive barriers. A generalized boundary framework is proposed and evaluated for both field and laboratory columns for diffusion dominated transport. Also, analytical and semi-analytical solutions are presented for transport of sequentially decaying contaminants influenced by nonequilibrium sorption. The developed solutions are used to simulate the migration of TCE and its reaction products in a zero-valent iron permeable treatment wall.; Model testing was conducted by performing a series of batch isotherm and column transport experiments. Column transport experiments were conducted using flexible wall permeameters to investigate diffusion-dominated transport through low-permeability media. Two types of barrier media were employed: (1) soil bentonite, and (2) soil bentonite modified with natural humus. It is shown that for vertical barriers constructed of soil bentonite matrix, the solute effective molecular diffusion coefficients reduce by a factor between 3–5 from their corresponding aqueous diffusion coefficients. Also, it is shown that the effective partitioning of organic contaminants in the flow-through soil bentonite matrices is significantly lower than that measured in batch isotherm experiments. Finally, it is shown that the addition of natural humus to increase the sorption capacity of the resulting soil bentonite matrix may significantly hinder the contaminant fluxes exiting the vertical barriers.
机译：作为常规修复的可能替代方法，用于环境应用的地下围堵已引起广泛关注。围堵系统通常由围绕危险物质区域的垂直屏障组成。在这项研究中，为垂直屏障的分析和设计开发并测试了污染物迁移模型。这些模型是为通过低渗透性垂直屏障的扩散为主的运输和通过渗透性反应性屏障的对流为主的运输而开发的。提出了一个通用的边界框架，并针对扩散支配的运输现场和实验室柱进行了评估。此外，还提出了分析和半分析解决方案，用于传输受非平衡吸附影响的依次衰减的污染物。开发的解决方案用于模拟TCE及其反应产物在零价铁可渗透处理壁中的迁移。通过执行一系列批量等温线和柱传输实验进行模型测试。使用挠性壁渗透仪进行了色谱柱传输实验，以研究通过渗透率低的介质进行扩散为主的传输。使用了两种类型的阻隔介质：（1）土壤膨润土和（2）用天然腐殖土改性的土壤膨润土。结果表明，对于由土壤膨润土基质构成的垂直屏障，溶质有效分子扩散系数从其相应的水扩散系数降低了3-5倍。另外，还表明，有机污染物在流通土壤膨润土基质中的有效分配明显低于分批等温线实验中测得的有效分配。最后，结果表明，添加天然腐殖质以提高所得土壤膨润土基质的吸附能力可能会严重阻碍污染物从垂直屏障中逸出。

著录项

  • 作者

    Khandelwal, Ashutosh.;

  • 作者单位

    State University of New York at Buffalo.;

  • 授予单位 State University of New York at Buffalo.;
  • 学科 Engineering Environmental.; Agriculture Soil Science.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 185 p.
  • 总页数 185
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;土壤学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号