Treatment of TCE-DNAPL Source Zones using Nanoscale Iron: Treatability Studies with Z-LoyTM.
Treatability studies were conducted to explore the extent to which Z-Loy, a
commercially-available suspension of nanoscale, reactive iron particles, can transform
TCE-DNAPL within a heterogeneous source zone. The surface-normalized, pseudo-first-order
rate coefficient for TCE degradation with Z-Loy was determined to be (8.77 ± 0.15)
× 10 -4 L/m2-hr ((8.77 ±0.15) × 10 -4 L/g-hr) in b... read moreatch experiments.
Primary degradation products in these experiments were found to be ethene and ethane.
The rate of TCE degradation using Z-Loy is comparable to other iron products being
marketed as nanoscale ZVI. Two dimensional aquifer cell studies were conducted to
examine the combined transport and reaction within a heterogeneous DNAPL source zone.
Results from these experiments suggest Z-Loy has limited transport in the subsurface.
Average mass discharges downstream of the Z-Loy were decreased by 85% over the course of
a 14 day treatment period. Reductions in mass discharge were attributed to the combined
effect of reaction and flow field alteration (Z-Loy reduced the flow through the treated
zone). Effluent samples collected from the aquifer cell suggest 2.03 mmol TCE (of 160
mmol initially present) were reacted. Overall results suggest that the use of Z-Loy may
hold promise for containment, but should not be viewed as a source reduction
Thesis (M.S.)--Tufts University, 2011.
Submitted to the Dept. of Civil Engineering.
Advisor: C. Andrew Ramsburg.
Committee: Kurt Pennell, and Grant Garven.
Keywords: Environmental engineering, Environmental science, and Chemical engineering.read less