Phreatophyte influence on reductive dechlorination in a shallow aquifer contaminated with trichloroethene (TCE)

International Journal of Phytoremediation

, , , , , and


  • The Publications Warehouse does not have links to digital versions of this publication at this time
  • Download citation as: RIS


Phytoremediation uses the natural ability of plants to degrade contaminants in groundwater. A field demonstration designed to remediate aerobic shallow groundwater contaminated with trichloroethene began in April 1996 with the planting of cottonwood trees, a short-rotation woody crop, over an approximately 0.2-ha area at the Naval Air Station, Fort Worth, Texas. The project was developed to demonstrate capture of contaminated groundwater and degradation of contaminants by phreatophytes. Analyses from samples of groundwater collected from July 1997 to June 1998 indicate that tree roots have the potential to create anaerobic conditions in the groundwater that will facilitate degradation of trichloroethene by microbially mediated reductive dechlorination. Organic matter from root exudates and decay of tree roots probably stimulate microbial activity, consuming dissolved oxygen. Dissolved oxygen concentrations, which varied across the site, were smallest near a mature cottonwood tree (about 20 years of age and 60 meters southwest of the cottonwood plantings) where degradation products of trichloroethene were measured. Oxidation of organic matter is the primary microbially mediated reaction occurring in the groundwater beneath the planted trees whereas near the mature cottonwood tree, data indicate that methanogenesis is the most probable reaction occurring. Reductive dechlorination in groundwater either is not occurring or is not a primary process away from the mature tree. Carbon-13 isotope values for trichloroethene are nearly identical at locations away from the mature tree, further confirming that dechlorination is not occurring at the site.

Additional publication details

Publication type:
Publication Subtype:
Journal Article
Phreatophyte influence on reductive dechlorination in a shallow aquifer contaminated with trichloroethene (TCE)
Series title:
International Journal of Phytoremediation
Year Published:
Larger Work Type:
Larger Work Subtype:
Journal Article
Larger Work Title:
International Journal of Phytoremediation
First page:
Last page: