• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ground water >Benzene Dynamics and Biodegradation in Alluvial Aquifers Affected by River Fluctuations
【24h】

Benzene Dynamics and Biodegradation in Alluvial Aquifers Affected by River Fluctuations

机译：河流波动对冲积含水层中苯动力学和生物降解的影响

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

The spatial distribution and temporal dynamics of a benzene plume in an alluvial aquifer strongly affected by river fluctuations was studied. Benzene concentrations, aquifer geochemistry datasets, past river morphology, and benzene degradation rates estimated in situ using stable carbon isotope enrichment were analyzed in concert with aquifer heterogeneity and river fluctuations. Geochemistry data demonstrated that benzene biodegradation was on-going under sulfate reducing conditions. Long-term monitoring of hydraulic heads and characterization of the alluvial aquifer formed the basis of a detailed modeled image of aquifer heterogeneity. Hydraulic conductivity was found to strongly correlate with benzene degradation, indicating that low hydraulic conductivity areas are capable of sustaining benzene anaerobic biodegradation provided the electron acceptor (SO_4~(2-)) does not become rate limiting. Modeling results demonstrated that the groundwater flux direction is reversed on annual basis when the river level rises up to 2 m, thereby forcing the infiltration of oxygenated surface water into the aquifer. The mobilization state of metal trace elements such as Zn, Cd, and As present in the aquifer predominantly depended on the strong potential gradient within the plume. However, infiltration of oxygenated water was found to trigger a change from strongly reducing to oxic conditions near the river, causing mobilization of previously immobile metal species and vice versa. MNA appears to be an appropriate remediation strategy in this type of dynamic environment provided that aquifer characterization and targeted monitoring of redox conditions are adequate and electron acceptors remain available until concentrations of toxic compounds reduce to acceptable levels.
机译：研究了河流波动强烈影响的冲积含水层中苯羽的空间分布和时间动态。分析了苯的浓度，含水层地球化学数据集，过去的河流形态以及使用稳定的碳同位素富集原位估算的苯降解速率，并与含水层的非均质性和河流波动相结合。地球化学数据表明，在硫酸盐还原条件下，苯的生物降解作用正在进行中。液压头的长期监测和冲积含水层的特征形成了含水层非均质性详细建模图像的基础。发现水力传导率与苯降解密切相关，表明低水力传导率区域能够维持苯厌氧生物降解，只要电子受体（SO_4〜（2-））不成为速率限制。模拟结果表明，当河流水位上升至2 m时，地下水通量的方向每年都会反转，从而迫使含氧地表水渗入含水层。存在于含水层中的金属微量元素（例如Zn，Cd和As）的迁移状态主要取决于羽流中的强势梯度。然而，发现含氧水的渗透会触发从河附近的强还原到有氧条件的转变，从而导致以前不可移动的金属物种动员，反之亦然。 MNA在这种动态环境中似乎是一种适当的补救策略，条件是含水层表征和氧化还原条件的目标监测是足够的，并且电子受体仍然可用，直到有毒化合物的浓度降至可接受的水平。

著录项

  • 来源
    《Ground water》 |2014年第3期|388-398|共11页
  • 作者

    J. Batlle-Aguilar; B. Morasch; D. Hunkeler; S. Brouyere;

  • 作者单位

    Department ArGEnCo, Hydrogeology Unit and Aquapole, University of Liege, Building 52/3, B-4000 Sart Tilman, Belgium ,Currently at National Centre for Groundwater Research and Training (NCGRT), School of the Environment, Flinders University, G.P.O. Box 2100, Adelaide, SA 5001, Australia;

    Center for Applied Geoscience (ZAG), University of Tuebingen, Sigwartstr. 16, D-72076 Tuebingen, Germany;

    Centre for Hydrogeology, University of Neuchatel, Rue Emile-Argand 11, CH-2009 Neuchatel, Switzerland;

    Department ArGEnCo, Hydrogeology Unit and Aquapole, University of Liege, Building 52/3, B-4000 Sart Tilman, Belgium;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 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