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Gas production and transport during bench-scale electrical resistance heating of water and trichloroethene

机译:水和三氯乙烯的台式电阻加热过程中的天然气生产和运输

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摘要

The effective remediation of chlorinated solvent source zones using in situ thermal treatment requires successful capture of gas that is produced. Replicate electrical resistance heating experiments were performed in a thin bench-scale apparatus, where water was boiled and pooled dense non-aqueous phase liquid (DNAPL) trichloroethene (TCE) and water were co-boiled in unconsolidated silica sand. Quantitative light transmission visualization was used to assess gas production and transport mechanisms. In the water boiling experiments, nudeation, growth and coalescence of the gas phase into connected channels were observed at critical gas saturations of S_(gc) = 0.233 ± 0.017, which allowed for continuous gas transport out of the sand. In experiments containing a colder region above a target heated zone, condensation prevented the formation of steam channels and discrete gas clusters that mobilized into colder regions were trapped soon after discontinuous transport began. In the TCE-water experiments, co-boiling at immiscible fluid interfaces resulted in discontinuous gas transport above the DNAPL pool. Redistribution of DNAPL was also observed above the pool and at the edge of the vapor front that propagated upwards through colder regions. These results suggest that the subsurface should be heated to water boiling temperatures to facilitate gas transport from specific locations of DNAPL to extraction points and reduce the potential for DNAPL redistribution. Decreases in electric current were observed at the onset of gas phase production, which suggests that coupled electrical current and temperature measurements may provide a reliable metric to assess gas phase development.
机译:使用原位热处理对氯化溶剂源区域进行有效的修复需要成功捕获所产生的气体。在稀薄的台式设备中进行重复的电阻加热实验,在该设备中将水煮沸,然后合并稠密的非水相液体(DNAPL)三氯乙烯(TCE),并将水在未固结的硅砂中共煮。定量光透射可视化用于评估气体的产生和传输机制。在水沸腾实验中,在临界气体饱和度S_(gc)= 0.233±0.017时,观察到气相向连通通道的裸露,生长和聚结,这使得气体可以连续从砂中运出。在包含位于目标加热区上方的较冷区域的实验中,凝结阻止了蒸汽通道的形成,并且在不连续运输开始后不久,捕获了聚集到较冷区域的离散气体簇。在TCE-水实验中,在不混溶的流体界面处共沸导致DNAPL池上方的气体传输不连续。还观察到池上方和蒸气前沿边缘向上扩散穿过较冷区域的DNAPL的重新分布。这些结果表明,应将地下加热至沸水温度,以利于气体从DNAPL的特定位置传输到提取点,并降低DNAPL重新分布的可能性。在气相产生开始时观察到电流的减少,这表明电流和温度的耦合测量可以提供可靠的度量来评估气相的发展。

著录项

  • 来源
    《Journal of Contaminant Hydrology》 |2014年第9期|24-36|共13页
  • 作者

    P.R. Hegele; K.G. Mumford;

  • 作者单位

    Department of Civil Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada,McMillan-McGee Corp., Calgary, Alberta T2B 3M9, Canada;

    Department of Civil Engineering, Queen's University, Kingston, Ontario K7L 3N6, 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

    Thermal remediation; Non-aqueous phase liquid; Internal drainage; Gas flow;

    机译:热修复;非水相液体;内部排水;气体流量;
  • 入库时间 2022-08-17 13:40:00

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