A mass balance study of the phytoremediation of perchloroethylene-contaminated groundwater |
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| Authors: | C Andrew James Gang Xin Sharon L Doty Indulis Muiznieks Lee Newman Stuart E Strand |
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| Institution: | 1. SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China;2. College of Bioengineering, East China University of Science and Technology, Shanghai 200237, China;1. Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States;2. Department of Microbiology, Oregon State University, Corvallis, Oregon 97331, United States;3. Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, Oregon 97331, United States;4. Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina Chapel Hill, Chapel Hill, North Carolina 27599, United States;5. Graduate School of Public Health, San Diego State University, San Diego, California 92182, United States |
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| Abstract: | A mass balance study was performed under controlled field conditions to investigate the phytoremediation of perchloroethylene (PCE) by hybrid poplar trees. Water containing 7–14 mg L?1 PCE was added to the test bed. Perchloroethylene, trichloroethylene, and cis-dichloroethylene were detected in the effluent at an average of 0.12 mg L?1, 3.9 mg L?1, and 1.9 mg L?1, respectively. The total mass of chlorinated ethenes in the water was reduced by 99%. Over 95% of the recovered chlorine was as free chloride in the soil, indicating near-complete dehalogenation of the PCE. Transpiration, volatilization, and accumulation in the trees were all found to be minor loss mechanisms. In contrast, 98% of PCE applied to an unplanted soil chamber was recovered as PCE in the effluent water or volatilized into the air. These results suggest that phytoremediation can be an effective method for treating PCE-contaminated groundwater in field applications. |
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