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1,4-Dioxane Soil Remediation Using Enhanced Soil Vapor Extraction (XSVE): II. Modeling

機(jī)譯：使用增強(qiáng)的土壤蒸氣提?。╔SVE）修復(fù)1,4-二惡烷的土壤：II。造型

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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.
機(jī)譯：1,4-二惡烷是一種揮發(fā)性有機(jī)化合物，可與水完全混溶，使其隔離在滲流區(qū)的孔隙水中，并長(zhǎng)期作為地下水污染源。傳統(tǒng)的土壤蒸氣萃取（SVE）可以去除1,4-二惡烷;但是，即使在其他共處的氯化溶劑被修復(fù)后，仍可能殘留大量的1,4-二惡烷。在加利福尼亞州的前麥克萊倫空軍基地進(jìn)行了集中萃取和加熱注射的增強(qiáng)型SVE（XSVE）現(xiàn)場(chǎng)演示，使土壤濃度降低了94％。創(chuàng)建了篩選級(jí)工具HypeVent XSVE，以協(xié)助系統(tǒng)設(shè)計(jì)和減少數(shù)據(jù)，并預(yù)測(cè)操作因素如何影響XSVE性能（例如，清理級(jí)別，修復(fù)時(shí)間等）。它假設(shè)混合條件良好，并結(jié)合了能量平衡，水和污染物的質(zhì)量平衡以及與溫度相關(guān)的1,4-二惡烷亨利定律常數(shù)。用戶輸入的內(nèi)容包括目標(biāo)處理區(qū)大小，初始1,4-二惡烷和土壤水分濃度，以及周圍環(huán)境和注入/提取條件（溫度，濕度）?；诖硎痉饵c(diǎn)條件的輸入進(jìn)行的投影可以充分預(yù)期觀察到的宏觀現(xiàn)場(chǎng)結(jié)果。敏感性分析表明，去除量隨著加熱空氣注入溫度和相對(duì)濕度的增加以及土壤初始含水量的減少而增加。

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    《Ground Water Monitoring & Remediation》 |2018年第2期|49-56|共8頁(yè)
  • 作者單位

    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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