Implications of cis-DCE Partitioning on Aqueous-Phase Concentrations within Bioactive DNAPL Source Zones(Abstract)

摘要

Results from laboratory and field investigations demonstrate that bacterially-mediated metabolic reductive dechlorination (a.k.a. chlororespiration) has the potential to substan- tially reduce the longevity of chloroethene source zones by increasing the apparent rate of dense non-aqueous phase liquid (DNAPL) dissolution. While promising, many chloro- ethene biodegradation studies that have been conducted with contaminant concentrations consistent with those found in DNAPL source zones report an accumulation of cis- dichloroethene (cis-DCE) and vinyl chloride (VC). The observation of incomplete dechlorination has been attributed to chloroethene inhibition of various bacterial species within site-specific dechlorinating consortia as well as the absence of organisms capable of metabolic transformation of cis-DCE and VC.