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Treatment of volatile organic contaminants in a vertical flow filter - relevance of different removal processes

  • Vertical flow filters and vertical flow constructed wetlands are established wastewater treatment systems and have also been proposed for the treatment of contaminated groundwater. This study investigates the removal processes of volatile organic compounds in a pilot-scale vertical flow filter. The filter is intermittently irrigated with contaminated groundwater containing benzene, MTBE and ammonium as the main contaminants. The system is characterized by unsaturated conditions and high contaminant removal efficiency. The aim of the present study is to evaluate the contribution of biodegradation and volatilization to the overall removal of benzene and MTBE. Tracer tests and flow rate measurements showed a highly transient flow and heterogeneous transport regime. Radon-222, naturally occurring in the treated groundwater, was used as a gas tracer and indicated a high volatilization potential. Radon-222 behavior was reproduced by numerical simulations and extrapolated for benzene and MTBE, and indicated these compounds also have a highVertical flow filters and vertical flow constructed wetlands are established wastewater treatment systems and have also been proposed for the treatment of contaminated groundwater. This study investigates the removal processes of volatile organic compounds in a pilot-scale vertical flow filter. The filter is intermittently irrigated with contaminated groundwater containing benzene, MTBE and ammonium as the main contaminants. The system is characterized by unsaturated conditions and high contaminant removal efficiency. The aim of the present study is to evaluate the contribution of biodegradation and volatilization to the overall removal of benzene and MTBE. Tracer tests and flow rate measurements showed a highly transient flow and heterogeneous transport regime. Radon-222, naturally occurring in the treated groundwater, was used as a gas tracer and indicated a high volatilization potential. Radon-222 behavior was reproduced by numerical simulations and extrapolated for benzene and MTBE, and indicated these compounds also have a high volatilization potential. In contrast, passive sampler measurements on top of the filter detected only low benzene and MTBE concentrations. Biodegradation potential was evaluated by the analysis of catabolic genes involved in organic compound degradation and a quantitative estimation of biodegradation was derived from stable isotope fractionation analysis. Results suggest that despite the high volatilization potential, biodegradation is the predominant mass removal process in the filter system, which indicates that the volatilized fraction of the contaminants is still subject to subsequent biodegradation. In particular, the upper filter layer located between the injection tubes and the surface of the system might also contribute to biodegradation, and might play a crucial role in avoiding the emission of volatilized contaminants into the atmosphere.show moreshow less

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Metadaten
Author:Cecilia De Biase, Daniel Reger, Axel Schmidt, Sven Jechalke, Nils Reiche, Paula M. Martinez-Lavanchy, Monica Rosell, Manfred Van Afferden, Uli Maier, Sascha E. OswaldORCiDGND, Martin Thullner
DOI:https://doi.org/10.1016/j.ecoleng.2011.03.023
ISSN:0925-8574 (print)
Parent Title (English):Ecological engineering : the journal of ecotechnology
Publisher:Elsevier
Place of publication:Amsterdam
Document Type:Article
Language:English
Year of first Publication:2011
Year of Completion:2011
Release Date:2017/03/26
Tag:Benzene; Biodegradation; Catabolic genes; MTBE; Numerical modeling; Radon; SAFIRA II; Stable isotope fractionation analysis; Tracers; VOCs; Volatilization
Volume:37
Issue:9
Pagenumber:12
First Page:1292
Last Page:1303
Funder:Helmholtz Centre for Environmental Research - UFZ; Helmholtz Association; European Commission [211684]; Autonomous Government of Catalonia (Agenda de Gestio d'Ajuts Universitaris i de Recerca, AGAUR) [BP-A 00054]; [VG-NG-338]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften
Peer Review:Referiert