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1,4-Dioxane Soil Remediation Using Enhanced Soil Vapor Extraction: I. Field Demonstration

機(jī)譯：利用增強(qiáng)的土壤蒸氣提取法修復(fù)1,4-二惡烷的土壤：I.田間示范

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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.
機(jī)譯：1,4-二惡烷與水完全混溶，并在滲漏的孔隙水中螯合，滲水可作為長期地下水污染的來源。盡管通過常規(guī)土壤蒸汽萃取（SVE）去除了一些1,4-二惡烷，但修復(fù)通常效率不高。如果SVE井將1,4-二惡烷蒸氣拉過先前干凈的土壤，那么在環(huán)境溫度下較低的亨利定律常數(shù)會(huì)阻礙SVE效率，并且會(huì)重新分配到滲流孔水中。假設(shè)加熱空氣注入和更集中的SVE提?。ㄔ鰪?qiáng)的SVE或XSVE）可以提高1,4-二惡烷滲流的效率，該新工藝已在加利福尼亞州的麥克萊倫空軍基地進(jìn)行了測試。 XSVE系統(tǒng)有四個(gè)外圍加熱空氣注入井，它們圍繞一個(gè)6.1m x 6.1m x 9.1m深處理區(qū)，并帶有一個(gè)中央蒸汽抽取井。在運(yùn)行14個(gè)月后，注入井附近的土壤溫度高達(dá)90攝氏度，并且用接近20,000孔體積的注入空氣沖洗了處理區(qū)。處理后的采樣結(jié)果表明，1,4-二惡烷的減少量約為94％，土壤水分的減少量約為45％。鑒于修復(fù)系統(tǒng)組件的簡單性和有希望的演示測試結(jié)果，XSVE可能會(huì)成為包含1,4-二惡烷的滲流帶土壤的一種經(jīng)濟(jì)有效的修復(fù)選擇。

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

    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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