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Enhanced In-Situ Anaerobic Bioremediation of TCE-Contaminated Groundwater Using Nanoscale Zero-Valent Iron (nZVI)
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Enhanced In-Situ Anaerobic Bioremediation of TCE-Contaminated Groundwater Using Nanoscale Zero-Valent Iron (nZVI)

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Abstract:

In this study, a trichloroethylene (TCE)-spill site was selected to assess the feasibility of enhanced in situ anaerobic bioremediation of TCE-contaminated groundwater using hydrogen as the electron donor produced from nanoscale zero-valent iron (nZVI). Results of hydrogen production experiments show that nZVI had a good efficiency on hydrogen production. Results of microcosm study show that indigenous microorganisms were capable of degrading TCE under anaerobic reductive dechlorinating conditions. Compared to the live control and autoclaved control microcosms, microcosms with hydrogen addition significantly enhanced the TCE removal rates. Results imply that nZVI can be applied as the source of hydrogen to bioremediate TCE-contaminated groundwater under anaerobic conditions. Except for the biotic mechanism, the supplied nZVI can also cause the TCE degradation via abiotic mechanism through oxidation-reduction process. For field application, if proper doses of iron nanoparticles can be applied in the mid- or downgradient areas, both chemical and biological mechanisms can enhance the removal of the contaminants and their byproducts. Knowledge and comprehension obtained in this study will be helpful in designing an enhanced in situ anaerobic bioremediation system for a TCE-contaminated site. The nZVI treatment scheme would be expected to provide a more cost-effective alternative to remediate chlorinated-solvent contaminated aquifers.

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Periodical:

Materials Science Forum (Volume 694)

Pages:

3-7

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.694.3

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Online since:

July 2011

Authors:

K.F. Chen, C.M. Kao, W.P. Sung, C.C. Lin, T.Y. Yeh

Keywords:

Electron Donor, Enhanced Bioremediation, Hydrogen, Nanoscale Zero-Valent Iron (NZVI), Trichloroethylene (TCE)

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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