| Autor: |
Gafni, Almog, Rosenzweig, Ravid, Gelman, Faina, Ronen, Zeev |
| Předmět: |
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| Zdroj: |
Journal of Chemical Technology & Biotechnology; Jun2016, Vol. 91 Issue 6, p1638-1645, 8p |
| Abstrakt: |
BACKGROUND The fuel additive, methyl tert-butyl ether ( MTBE), is one of the most frequently occurring groundwater pollutants worldwide. The present study focused on assessing microbial degradation of MTBE in groundwater below a gasoline station situated above the Israeli Coastal Aquifer. Groundwater was monitored in six monitoring wells over a time period of 2.5 years. RESULTS The site water geochemistry indicated that anaerobic conditions prevailed in two of the most contaminated wells. During a year MTBE concentrations declined from 81 to 4.2 mg L−1, concurrently, with a significant change in δ13C from −31.4 to −11.8 ‰ in a source area monitoring well. MTBE biodegradation during microcosm experiments under sulfate reducing and methanogenic conditions resulted in carbon isotopic enrichment factors ( ε) of −17.2 ± 1.1 ‰. CONCLUSION Significant decrease in MTBE concentrations, along with pronounced changes in carbon isotope composition, indicates in situ degradation of MTBE occurring at the site. This evidence was supported by a microcosm experiment with indigenous microbial cultures. The estimated rate of biodegradation is 0.7 year−1, which is about 70% of the total natural attenuation ( NA) processes. © 2016 Society of Chemical Industry [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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