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Adaptation of a Constructed Wetland to Simultaneous Treatment of Monochlorobenzene and Perchloroethene.
In: International Journal of Phytoremediation, Jg. 13 (2011-11-01), Heft 10, S. 998-1013
Online
academicJournal
Zugriff:
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 2½ 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. [ABSTRACT FROM AUTHOR]
Titel: |
Adaptation of a Constructed Wetland to Simultaneous Treatment of Monochlorobenzene and Perchloroethene.
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Autor/in / Beteiligte Person: | Braeckevelt, M. ; Seeger, E.M. ; Paschke, H. ; Kuschk, P. ; Kaestner, M. |
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Zeitschrift: | International Journal of Phytoremediation, Jg. 13 (2011-11-01), Heft 10, S. 998-1013 |
Veröffentlichung: | 2011 |
Medientyp: | academicJournal |
ISSN: | 1522-6514 (print) |
DOI: | 10.1080/15226514.2010.549860 |
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