Chlorinated ethene's physical properties as well as ubiquitous
state at DOD installations makes it a priority for innovative
remediation efforts. Current techniques are expensive and time
consuming to maintain. Constructed wetlands suggest an inexpensive
and operational alternative to conventional technologies.
Sub-surface flow wetlands provide the anaerobic zones necessary to
reduce the recalcitrant chlorinated solvents prior to anaerobic or
aerobic mineralization of its daughter products. A vertical flow
cell to include sequential sedimentary layers of two hydric soil
lifts and a mix of hydric soil and woody compost was the subject of
this investigation. This study focused on the statistical
significance among the three constructed strata. Concentrations of
mono-carboxylic acids and other anions are indicators of the
reductive conditions necessary for remediation. Acid anion
concentrations were expected to be higher in the assumed anaerobic
strata of the constructed cell as a result of the fermentation of
humic substances. Decreases in sulfate and nitrate were also
expected over the upward flowing, wetland profile due to the
reductive, anoxic conditions. Evidence in this study validate these
assumptions and suggest that constructed wetlands are a viable
alternative to current remediation methods. Findings also suggest
manipulation of the physical parameters such as strata depth, soil
type, flow rate, etcof a wetland could increase the cell's
remediation effectiveness.
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