Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1080/15226514.2010.549860
Title (Primary) Adaptation of a constructed wetland to simultaneous treatment of monochlorobenzene and perchloroethene
Author Braeckevelt, M.; Seeger, E.M.; Paschke, H.; Kuschk, P.; Kästner, M.
Source Titel International Journal of Phytoremediation
Year 2011
Department UBT; GWS
Volume 13
Issue 10
Page From 998
Page To 1013
Language englisch
Keywords Phytoremediation; chlorinated solvents; groundwater-surface water interface; reductive dechlorination; microbial degradation
Abstract Mixed groundwater contaminations by chlorinated volatile organic compounds (VOC) cause environmental hazards if contaminated groundwater discharges into surface waters and river floodplains. Constructed wetlands (CW) or engineered natural wetlands provide a promising technology for the protection of sensitive water bodies. We adapted a constructed wetland able to treat monochlorobenzene (MCB) contaminated groundwater to a mixture of MCB and tetrachloroethene (PCE), representing low and high chlorinated model VOC. Simultaneous treatment of both compounds was efficient after an adaptation time of 2 years. Removal of MCB was temporarily impaired by PCE addition, but after adaptation a MCB concentration decrease of up to 64% (55.3 µmol L-1) was observed. Oxygen availability in the rhizosphere was relatively low, leading to sub-optimal MCB elimination but providing also appropriate conditions for PCE dechlorination. PCE and metabolites concentration patterns indicated a very slow system adaptation. However, under steady state conditions complete removal of PCE inflow concentrations of 10-15 µmol L-1 was achieved with negligible concentrations of chlorinated metabolites in the outflow. Recovery of total dechlorination metabolite loads corresponding to 100%, and ethene loads corresponding to 30% of the PCE inflow load provided evidence for complete reductive dechlorination, corroborated by the detection of Dehalococcoides sp.
Persistent UFZ Identifier
Braeckevelt, M., Seeger, E.M., Paschke, H., Kuschk, P., Kästner, M. (2011):
Adaptation of a constructed wetland to simultaneous treatment of monochlorobenzene and perchloroethene
Int. J. Phytoremediat. 13 (10), 998 - 1013 10.1080/15226514.2010.549860