کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9482971 | 1627151 | 2005 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Quantifying chlorinated ethene degradation during reductive dechlorination at Kelly AFB using stable carbon isotopes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
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![عکس صفحه اول مقاله: Quantifying chlorinated ethene degradation during reductive dechlorination at Kelly AFB using stable carbon isotopes Quantifying chlorinated ethene degradation during reductive dechlorination at Kelly AFB using stable carbon isotopes](/preview/png/9482971.png)
چکیده انگلیسی
Stable isotope analysis of chlorinated ethene contaminants was carried out during a bioaugmentation pilot test at Kelly Air Force Base (AFB) in San Antonio Texas. In this pilot test, cis-1,2-dichloroethene (cDCE) was the primary volatile organic compound. A mixed microbial enrichment culture, KB-1â¢, shown in laboratory experiments to reduce chlorinated ethenes to non-toxic ethene, was added to the pilot test area. Following bioaugmentation with KB-1â¢, perchloroethene (PCE), trichloroethene (TCE) and cDCE concentrations declined, while vinyl chloride (VC) concentrations increased and subsequently decreased as ethene became the dominant transformation product. Shifts in carbon isotopic values up to 2.7â°, 6.4â°, 10.9â° and 10.6â° were observed for PCE, TCE, cDCE and VC, respectively, after bioaugmentation, consistent with the effects of biodegradation. While a rising trend of VC concentrations and the first appearance of ethene were indicative of biodegradation by 72 days post-bioaugmentation, the most compelling evidence of biodegradation was the substantial carbon isotope enrichment (2.0â° to 5.0â°) in ä13CcDCE. Fractionation factors obtained in previous laboratory studies were used with isotope field measurements to estimate first-order cDCE degradation rate constants of 0.12 hâ1 and 0.17 hâ1 at 115 days post-bioaugmentation. These isotope-derived rate constants were clearly lower than, but within a factor of 2-4 of the previously published rate constant calculated in a parallel study at Kelly AFB using chlorinated ethene concentrations. Stable carbon isotopes can provide not only a sensitive means for early identification of the effects of biodegradation, but an additional means to quantify the rates of biodegradation in the field.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Contaminant Hydrology - Volume 76, Issues 3â4, February 2005, Pages 279-293
Journal: Journal of Contaminant Hydrology - Volume 76, Issues 3â4, February 2005, Pages 279-293
نویسندگان
Penny L. Morrill, Georges Lacrampe-Couloume, Gregory F. Slater, Brent E. Sleep, Elizabeth A. Edwards, Michaye L. McMaster, David W. Major, Barbara Sherwood Lollar,