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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Estimating bioaugmentation efficacy of TCE dechlorination using long-term field well-to-well tests in a highly recharged and TCE-contaminated aquifer
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Estimating bioaugmentation efficacy of TCE dechlorination using long-term field well-to-well tests in a highly recharged and TCE-contaminated aquifer

机译：在高补给量和受TCE污染的含水层中使用长期现场井间测试评估TCE脱氯的生物强化效果

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摘要

This study demonstrates a combined field method accurately assessing the extent of trichloroethylene (TCE) reductive dechlorination activity and the mass fraction of its by-products. A combined method of injecting a known concentration of 1,1,2-trichloro-2-fluoroethene (TCFE) as a TCE bio-surrogate and a data processing technique of forced mass balance (FMB), considering the sorption effect on the mass fraction of chloroethene was evaluated by performing soil column and field bioaugmentation tests. In the soil column test, the FMB resulted in the mass fraction of 6% TCE, 48.3% cis-1,2-dichloroethene, 18.5% vinyl chloride and 27.2% ethylene. In the field bioaugmentation test, TCFE showed equivalent dechlorination pathways of TCE. The mass fractions estimated by FMB were very similar to those observed in the soil column bioaugmentation tests: 4.5% TCFE, 57.1% 1,2-dichloro-1-fluoroethene, 12% 1-chloro-1-fluoroethene and 26.4% fluoroethene (FE). The FMB method gave approximate to 50% higher mass fraction for more chlorinated ethenes (i.e., TCFE) and approximate to 10% lower mass fraction of less chlorinated ethenes (i.e., FE) than those considering only the aqueous concentrations of chlorofluoroethenes. A combined method of TCFE and FMB that could accurately estimate both the extent of dechlorination activities and mass distribution of TCE reductive dechlorination would be highly useful.
机译：这项研究表明了一种结合现场方法，可以准确地评估三氯乙烯（TCE）还原脱氯活性的程度及其副产物的质量分数。考虑到对质量分数的吸附作用，结合注入已知浓度的1,1,2-三氯-2-氟乙烯（TCFE）作为TCE生物替代物的方法和强制质量平衡（FMB）的数据处理技术通过进行土壤柱和田间生物增强试验评估氯乙烯的含量。在土壤柱试验中，FMB的质量分数为6％TCE，48.3％顺式1,2-二氯乙烯，18.5％氯乙烯和27.2％乙烯。在现场生物增强测试中，TCFE显示了等效的TCE脱氯途径。 FMB估算的质量分数与土壤柱生物强化试验中观察到的质量分数非常相似：4.5％TCFE，57.1％1,2-二氯-1-氟乙烯，12％1-氯-1-氟乙烯和26.4％氟乙烯（FE ）。与仅考虑氯氟乙烯的水溶液浓度的情况相比，FMB方法对更多的氯化乙烯（即TCFE）的质量分数提高了约50％，对于更少的氯化乙烯（即FE）的质量分数降低了约10％。 TCFE和FMB的组合方法可以准确估计脱氯活性的程度和TCE还原性脱氯的质量分布，将非常有用。

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