Description |
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Abstract: Our ability
to design robust treatment approaches that achieve complete detoxification of
chlorinated solvents is limited by our understanding of interactions between reactive
minerals, sulfide, and organohalide respiring bacteria. This research was conducted to
address aspects of this knowledge gap. Batch reactors assessing sulfide toxicity on a
tetrachloroethene (PCE)-to-ethene ... read moredechlorinating consortia (BDI-SZ) revealed incomplete
dechlorination to ethene in systems containing more than 1 mM sulfide. Column studies
quantifying the impacts of iron sulfide (FeS) precipitation on Federal Fine Ottawa sand
revealed reductions of up to 7%, but these impacts can be reversed by FeS oxidization to
iron sulfates. In separate column experiments, the impact of reduced iron species on PCE
natural attenuation was demonstrated by supplementing the BDI-SZ culture with
iron-reducing Geobacter sulfurreducens, leading to dechlorination rates up to 4.9%
faster than BDI-SZ alone. These results improve our understanding of the environmental
bounds of abiotic and biotic chlorinated ethene
degradation.
Thesis (M.S.)--Tufts University,
2017.
Submitted to the Dept. of Civil
Engineering.
Advisors: Natalie Capiro, and Kurt
Pennell.
Committee: C.
Ramsburg.
Keywords: Environmental engineering,
Chemistry, and Microbiology.read less
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