Evans Patrick J, Trute Mary M
CDM, Bellevue, Washington 98005, USA.
Water Environ Res. 2006 Dec;78(13):2436-46. doi: 10.2175/106143006x123076.
When present in the vadose zone, potentially toxic nitrate and perchlorate anions can be persistent sources of groundwater contamination. Gaseous electron donor injection technology (GEDIT), an anaerobic variation of petroleum hydrocarbon bioventing, involves injecting electron donor gases, such as hydrogen or ethyl acetate, into the vadose zone, to stimulate biodegradation of nitrate and perchlorate. Laboratory microcosm studies demonstrated that hydrogen and ethanol promoted nitrate and perchlorate reduction in vadose zone soil and that moisture content was an important factor. Column studies demonstrated that transport of particular electron donors varied significantly; ethyl acetate and butyraldehyde were transported more rapidly than butyl acetate and ethanol. Nitrate removal in the column studies, up to 100%, was best promoted by ethyl acetate. Up to 39% perchlorate removal was achieved with ethanol and was limited by insufficient incubation time. The results demonstrate that GEDIT is a promising remediation technology warranting further validation.
当存在于渗流带时，具有潜在毒性的硝酸根和高氯酸根阴离子可能会持续污染地下水。气态电子供体注入技术（GEDIT）是石油烃生物通风的一种厌氧变体，该技术是将氢气或乙酸乙酯等电子供体气体注入渗流带，以刺激硝酸盐和高氯酸盐的生物降解。实验室微观研究表明，氢气和乙醇能促进渗流带土壤中硝酸盐和高氯酸盐的还原，且水分含量是一个重要因素。柱实验表明，特定电子供体的运移差异显著；乙酸乙酯和丁醛的运移速度比乙酸丁酯和乙醇更快。柱实验中，乙酸乙酯对硝酸盐的去除效果最佳，去除率高达100%。乙醇对高氯酸盐的去除率最高可达39%，但受孵育时间不足的限制。结果表明，气态电子供体注入技术是一种有前景的修复技术，值得进一步验证。
