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Title
The Effect of ZVI on Creating and Maintaining a Reductive Environment Conducive to the Dechlorination of TCE and Its Less-chlorinated Byproducts at a Contaminated Site
Description
The effect of an anaerobic reductive environment produced by the oxidation of zero valent iron (ZVI) on the microbial reductive dechlorination of trichloroethylene and its applicability to in-situ bioremediation processes was investigated using microcosms and soil column studies. I learned that microbial dechlorination requires a highly reductive environment, as represented by negative values for oxidation-reduction potential (ORP), which can be maintained through the addition of reducing agents such as ZVI, or to a lesser extent, the fermentation of added substrates such as lactate. Microcosm conditions represented distance from an in-situ treatment injection well and contained different types of iron species and dechlorinating bioaugmentation cultures. Diminishing efficacy of microbial reductive dechlorination along a gradient away from the injection zone was observed, characterized by increasing ORP and decreasing pH. Results also suggested that the use of particular biostimulation substrates is key to prioritizing the dechlorination reaction against competing microbial and abiotic processes by supplying electrons needed for microbial dechlorination.
Date Created
2017-12
Contributors
- Mouti, Aatikah (Author)
- Krajmalnik-Brown, Rosa (Thesis director)
- Delgado, Anca (Committee member)
- School of Life Sciences (Contributor)
- Barrett, The Honors College (Contributor)
Topical Subject
Resource Type
Extent
28 pages
Language
eng
Copyright Statement
In Copyright
Primary Member of
Series
Academic Year 2017-2018
Handle
https://hdl.handle.net/2286/R.I.46000
Level of coding
minimal
Cataloging Standards
System Created
- 2017-12-08 11:00:04
System Modified
- 2021-08-11 04:09:57
- 3 years 3 months ago
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