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Title (Primary) Characterization of in situ biodegradation in a model subsurface flow constructed wetland treating 1,2-dichloroethenes
Author Imfeld, G.; Estop Aragonés, C.; Zeiger, S.; Vitzthum von Eckstädt, C.; Paschke, H.; Trabitzsch, R.; Weiß, H.; Richnow, H.H.;
Journal Environmental Science & Technology
Year 2008
Department ISOBIO; GWS;
Volume 42
Issue 21
Language englisch;
Abstract The spatial and temporal biogeochemical development of a model wetland loaded with cis- and trans-1,2-dichloroethene contaminated groundwater was characterized over 430 days by hydrogeochemical and compound-specific isotope analyses (CSIA). The hydrogeochemistry dramatically changed over time from oxic to strongly reducing conditions as emphasized by increasing concentrations of ferrous iron, sulfide, and methane since day 225. d13C values for trans- and cis-DCE substantially changed over the flow path and correlated over time with DCE removal. The carbon enrichment factor values (?) retrieved from the wetland became progressively larger over the investigation period, ranging from -1.7 ± 0.3‰ to -32.6 ± 2.2‰. This indicated that less fractionating DCE oxidation was progressively replaced by reductive dechlorination, associated with a more pronounced isotopic effect and further confirmed by the detection of vinyl chloride and ethene since day 250. This study demonstrates the linkage between hydrogeochemical variability and intrinsic degradation processes and highlights the potential of CSIA to trace the temporal and spatial changes of the dominant degradation mechanism of DCE in natural or engineered systems.
ID 1051
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=1051
Imfeld, G., Estop Aragonés, C., Zeiger, S., Vitzthum von Eckstädt, C., Paschke, H., Trabitzsch, R., Weiß, H., Richnow, H.H. (2008):
Characterization of in situ biodegradation in a model subsurface flow constructed wetland treating 1,2-dichloroethenes
Environ. Sci. Technol. 42 (21), 7924 - 7930