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首页> 外文期刊>Ground Water Monitoring & Remediation >1,4-Dioxane Soil Remediation Using Enhanced Soil Vapor Extraction: I. Field Demonstration
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1,4-Dioxane Soil Remediation Using Enhanced Soil Vapor Extraction: I. Field Demonstration

机译：利用增强的土壤蒸气提取法修复1,4-二恶烷的土壤：I.田间示范

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摘要

1,4-Dioxane is totally miscible in water, sequestering in vadose pore water that can serve as a source of long-term groundwater contamination. Although some 1,4-dioxane is removed by conventional soil vapor extraction (SVE), remediation is typically inefficient. SVE efficiency is hindered by low Henry's Law constants at ambient temperature and redistribution to vadose pore water if SVE wells pull 1,4-dioxane vapors across previously clean soil. It was hypothesized that heated air injection and more focused SVE extraction (Enhanced SVE or XSVE) could increase the efficiency of 1,4-dioxane vadose treatment, and this new process was tested at former McClellan Air Force Base, CA. The XSVE system had four peripheral heated air injection wells surrounding a 6.1m x 6.1m x 9.1m deep treatment zone with a central vapor extraction well. After 14months of operation, soil temperatures reached as high as similar to 90 degrees C near the injection wells and the treatment zone was flushed with similar to 20,000 pore volumes of injected air. Post-treatment sampling results showed reductions of similar to 94% in 1,4-dioxane and similar to 45% in soil moisture. Given the simplicity of the remediation system components and the promising demonstration test results, XSVE has the potential to be a cost-effective remediation option for vadose zone soil containing 1,4-dioxane.
机译：1,4-二恶烷与水完全混溶，并在渗漏的孔隙水中螯合，渗水可作为长期地下水污染的来源。尽管通过常规土壤蒸汽萃取（SVE）去除了一些1,4-二恶烷，但修复通常效率不高。如果SVE井将1,4-二恶烷蒸气拉过先前干净的土壤，那么在环境温度下较低的亨利定律常数会阻碍SVE效率，并且会重新分配到渗流孔水中。假设加热空气注入和更集中的SVE提取（增强的SVE或XSVE）可以提高1,4-二恶烷渗流的效率，该新工艺已在加利福尼亚州的麦克莱伦空军基地进行了测试。 XSVE系统有四个外围加热空气注入井，它们围绕一个6.1m x 6.1m x 9.1m深处理区，并带有一个中央蒸汽抽取井。在运行14个月后，注入井附近的土壤温度高达90摄氏度，并且用接近20,000孔体积的注入空气冲洗了处理区。处理后的采样结果表明，1,4-二恶烷的减少量约为94％，土壤水分的减少量约为45％。鉴于修复系统组件的简单性和有希望的演示测试结果，XSVE可能会成为包含1,4-二恶烷的渗流带土壤的一种经济有效的修复选择。

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    《Ground Water Monitoring & Remediation》 |2018年第2期|40-48|共9页
  • 作者

    Hinchee Robert E.; Dahlen Paul R.; Johnson Paul C.; Burris David R.;

  • 作者单位

    Integrated Sci & Technol Inc, POB 215, Brigham City, UT 84302 USA;

    Arizona State Univ, Dept Civil Environm & Sustainable Engn, POB 875306, Tempe, AZ 85287 USA;

    Colorado Sch Mines, 1500 Illinois St, Golden, CO 80401 USA;

    Integrated Sci & Technol Inc, 228 Harrison Ave,Suite 102, Panama City, FL 32401 USA;

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