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首页> 外文期刊>Environmental Science & Technology >Reductions in Contaminant Mass Discharge Following Partial Mass Removal from DNAPL Source Zones
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Reductions in Contaminant Mass Discharge Following Partial Mass Removal from DNAPL Source Zones

机译：从DNAPL源区中部分去除污染物后减少污染物的大量排放

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摘要

Although in situ remediation technologies have been used to aggressively treat dense nonaqueous phase liquid (DNAPL)source zones,complete contaminant removal or destruction is rarely achieved.To evaluate the effects of partial source zone mass removal on dissolved-phase contaminant flux,four experiments were conducted in a two-dimensional aquifer cell that contained a tetrachloroethene (PCE)source zone and down-gradient plume region.Initial source zone PCE saturation distributions,quantified using a light transmission system,were expressed in terms of a ganglia-to-pool ratio (GTP),which ranged from 0.16 (13.8% ganglia)to 1.6 (61.5% ganglia).The cells were flushed sequentially with a 4% (wt.)Tween 80 surfactant solution to achieve incremental PCE mass removal,followed by water flooding until steady-state mass discharge and plume concentrations were established.In all cases,the GTP ratio decreased with increasing mass removal,consistent with the observed preferential dissolution of PCE ganglia and persistence of high-saturation pools.In the ganglia-dominated system (GTP =1.6),greater than 70% mass removal was required before measurable reductions in plume concentrations and mass discharge were observed.For pool-dominated source zones (GTP <0.3),substantial reductions (>50%)in mass discharge were realized after only 50% mass removal.
机译：尽管已采用原位修复技术积极地处理致密的非水相液体（DNAPL）源区，但很难实现完全的污染物去除或破坏。为评估部分源区质量去除对溶解相污染物通量的影响，进行了四个实验在包含四氯乙烯（PCE）源区和向下梯度羽流区的二维含水层单元中进行。初始源区PCE饱和度分布（使用光传输系统进行了量化）以神经节池比表示（GTP），范围从0.16（13.8％神经节）到1.6（61.5％神经节）。依次用4％（wt。）的Tween 80表面活性剂溶液冲洗细胞以实现PCE质量的逐步去除，随后进行水驱直到在所有情况下，GTP比率均随着去除质量的增加而降低，这与观察到的PCE g的优先溶出相一致。在以神经节为主的系统（GTP = 1.6）中，需要进行大于70％的质量去除，然后才能观察到可测量的羽流浓度和质量减少量。对于以游泳池为主的源区（GTP < 0.3），仅去除50％的质量即可实现质量排放的大幅减少（> 50％）。

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  • 来源
    《Environmental Science & Technology》 |2006年第19期|p.6110-6116|共7页
  • 作者

    ERIC J.SUCHOMEL; KURT D.PENNELL;

  • 作者单位

    School of Civil and Environmental Engineering,Georgia Institute of Technology,311 Ferst Drive,Atlanta,Georgia 30332-0512;

  • 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 环境化学;
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