期刊
JOURNAL OF CONTAMINANT HYDROLOGY
卷 110, 期 1-2, 页码 60-71出版社
ELSEVIER
DOI: 10.1016/j.jconhyd.2009.08.006
关键词
Dense nonaqueous phase liquid (DNAPL); Tetrachloroethene (PCE); Chlorinated ethene degradation products; Enhanced dissolution; Biodegradation; Stable carbon isotope fractionation
资金
- Natural Science and Engineering Research Council of Canada (NSERC)
- U.S. Department of Defence (DOD)
- Environmental Security Technology Certification Program (ESTCP) [ER0008]
The stable carbon isotope values of tetrachloroethene (PCE) and its degradation products were monitored during studies of biologically enhanced dissolution of PCE dense nonaqueous phase liquid (DNAPL) to determine the effect of PCE dissolution on observed isotope values. The degradation of PCE was monitored in a 2-dimensional model aquifer and in a pilot test cell (PTC) at Dover Air Force Base, both with emplaced PCE DNAPL sources. Within the plume down gradient from the source, the isotopic fractionation of dissolved PCE and its degradation products were consistent with those observed in biodegradation laboratory studies. However, close to the source zone significant shifts in the isotope values of dissolved PCE were not observed in either the model aquifer or PTC due to the constant input of newly dissolved, non fractionated PCE, and the small isotopic fractionation associated with PCE reductive dechlorination by the mixed microbial culture used. Therefore the identification of reductive dechlorination in the presence of PCE DNAPL was based upon the appearance of daughter products and the isotope values of those daughter products. An isotope model was developed to simulate isotope values of PCE during the dissolution and degradation of PCE adjacent to a DNAPL source zone. With the exception of very high degradation rate constants (>1/day) stable carbon isotope values of PCE estimated by the model remained within error of the isotope value of the PCE DNAPL, consistent with measured isotope values in the model aquifer and in the PTC. (C) 2009 Elsevier B.V. All rights reserved.
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