...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >~(34)S/~(32)S Fractionation during Sulfate Reduction in Groundwater Treatment Systems: Reactive Transport Modeling
【24h】

~(34)S/~(32)S Fractionation during Sulfate Reduction in Groundwater Treatment Systems: Reactive Transport Modeling

机译：地下水处理系统中硫酸盐还原过程中的〜（34）S /〜（32）S分级分离：反应迁移模型

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

Isotope ratio measurements provide a tool for indicating the relative significance of biogeochemical reactions and for constraining estimates of the extent and rate of reactions in passive treatment systems. In this paper, the reactive transport model MIN3P is used to evaluate sulfur isotope fractionation in column experiments designed to simulate treatment of contaminated water by microbially mediated sulfate reduction occurring within organic carbon-based and iron and carbon-based permeable reactive barriers. A mass dependent fractionation model was used to determine reaction rates for 32S and 34S compounds during reduction, precipitation, and dissolution reactions and to track isotope-dependent mass transfer during SO4 removal. The 6 S values obtained from the MIN3P model were similar to those obtained from the Rayleigh equation, indicating that there was not a significant difference between the conceptual models. Differences between the MIN3P derived a value and the Rayleigh equation derived value were attributed to minor changes in the dissolution and precipitation rate of gypsum and mathematical differences in the fitting models. The results indicated that the prediction of d 4S was fairly insensitive to differences in the fractionation factor at the concentration ranges measured in the current study. However, more significant differences would be expected at low sulfate conditions.
机译：同位素比测量提供了一种工具，用于指示生物地球化学反应的相对重要性，并约束被动处理系统中反应程度和速率的估计。在本文中，反应性迁移模型MIN3P用于评估柱实验中的硫同位素分馏，该实验旨在模拟在有机碳基以及铁和碳基渗透性反应性屏障内发生的微生物介导的硫酸盐还原反应，以处理污水。使用质量依赖的分馏模型确定还原，沉淀和溶解反应过程中32S和34S化合物的反应速率，并跟踪SO4去除过程中同位素依赖的质量转移。从MIN3P模型获得的6 S值与从瑞利方程获得的6 S值相似，表明概念模型之间没有显着差异。 MIN3P得出的值与Rayleigh方程得出的值之间的差异是由于石膏的溶解和沉淀速率的细微变化以及拟合模型中的数学差异所致。结果表明，在当前研究中测量的浓度范围内，d 4S的预测对分馏因子的差异相当不敏感。但是，在低硫酸盐条件下，预期会有更大的差异。

著录项

  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2863-2870|共8页
  • 作者

    Blair D. Gibson; Richard T. Amos; David W. Blowes;

  • 作者单位

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 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