Characterization of Chlorinated Ethene Degradation in a Vertical Flow Constructed Wetland
AIR FORCE INST OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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Chlorinated solvents, including perchloroethene PCE and trichlorethene TCE, are among the most common groundwater contaminants found in the United States. The use of constructed wetlands has shown promise as an effective and less costly alternative for the treatment of chlorinated solvent contaminated groundwater. This study characterized and evaluated the concentration of chlorinated ethenes within a vertical flow constructed wetland, fed with PCE contaminated groundwater, at Wright-Patterson Air Force Base WPAFB, Ohio. Chlorinated ethene concentrations were characterized within three distinct layers of the wetland cell, as well as within the influent, and effluent. In addition, a pore-water sampler prototype was designed and developed for this research effort in order to obtain a more detailed contaminant profile. PCE concentrations declined from an average of 46.5 mugL in the influent to an average of 0.5 mugL in the upper layer, a 98.9 decrease. The chlorinated ethene concentration profiles indicate that the lower half of the wetland provides favorable conditions for the complete anaerobic reductive dechlorination of the PCE. Within the upper half of the wetland, contaminant profiles indicate dominant degradation processes other than anaerobic reductive dechlorination, possibly including aerobic or anaerobic oxidation or direct volatization.
- Organic Chemistry
- Geology, Geochemistry and Mineralogy