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首页> 外文期刊>Ground Water Monitoring & Remediation >1,4-Dioxane Soil Remediation Using Enhanced Soil Vapor Extraction (XSVE): II. Modeling
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1,4-Dioxane Soil Remediation Using Enhanced Soil Vapor Extraction (XSVE): II. Modeling

机译：使用增强的土壤蒸气提取（XSVE）修复1,4-二恶烷的土壤：II。造型

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摘要

1,4-Dioxane is a volatile organic compound that is fully miscible in water, allowing it to sequester in vadose zone pore water and serve as a long-term source of groundwater contamination. Conventional soil vapor extraction (SVE) removes 1,4-dioxane; however, substantial 1,4-dioxane can remain even after other colocated chlorinated solvents have been remediated. A field demonstration of enhanced SVE (XSVE) with focused extraction and heated injection was conducted at former McClellan AFB, CA, achieving 94% reduction in soil concentrations. A screening-level tool, HypeVent XSVE, was created to assist in system design and data reduction and to anticipate how operating factors affect XSVE performance (e.g., cleanup level, remediation time, etc.). It assumes well-mixed conditions, and combines an energy balance, mass balances for water and contaminant, and a temperature-dependent 1,4-dioxane Henry's Law constant. User inputs include the target treatment zone size, initial 1,4-dioxane and soil moisture concentrations, and ambient site and injection/extraction conditions (temperature, humidity). Projections based on inputs representative of demonstration site conditions adequately anticipated the observed macroscopic field results. Sensitivity analyses show that removal increases with increasing heated air injection temperature and relative humidity and decreasing initial soil moisture content.
机译：1,4-二恶烷是一种挥发性有机化合物，可与水完全混溶，使其隔离在渗流区的孔隙水中，并长期作为地下水污染源。传统的土壤蒸气萃取（SVE）可以去除1,4-二恶烷;但是，即使在其他共处的氯化溶剂被修复后，仍可能残留大量的1,4-二恶烷。在加利福尼亚州的前麦克莱伦空军基地进行了集中萃取和加热注射的增强型SVE（XSVE）现场演示，使土壤浓度降低了94％。创建了筛选级工具HypeVent XSVE，以协助系统设计和减少数据，并预测操作因素如何影响XSVE性能（例如，清理级别，修复时间等）。它假设混合条件良好，并结合了能量平衡，水和污染物的质量平衡以及与温度相关的1,4-二恶烷亨利定律常数。用户输入的内容包括目标处理区大小，初始1,4-二恶烷和土壤水分浓度，以及周围环境和注入/提取条件（温度，湿度）。基于代表示范点条件的输入进行的投影可以充分预期观察到的宏观现场结果。敏感性分析表明，去除量随着加热空气注入温度和相对湿度的增加以及土壤初始含水量的减少而增加。

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  • 来源
    《Ground Water Monitoring & Remediation》 |2018年第2期|49-56|共8页
  • 作者

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

  • 作者单位

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

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

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

    Arizona State Univ, Sch Sustainable Engn & Built Environm, POB 873005, Tempe, AZ 85287 USA;

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