Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.watres.2011.07.010
Titel (primär) Remediation of groundwater contaminated with MTBE and benzene: the potential of vertical-flow soil filter systems
Autor van Afferden, M.; Rahman, K.Z.; Mosig, P.; De Biase, C.; Thullner, M.; Oswalt, P.; Müller, R.A.
Quelle Water Research
Erscheinungsjahr 2011
Department UMB; GWS; UBZ
Band/Volume 45
Heft 16
Seite von 5063
Seite bis 5074
Sprache englisch
Keywords Benzene; Groundwater remediation; Hydraulic loading rate; MTBE; Pilot-scale constructed wetland; Vertical-flow soil filter; Willow tree

Field investigations on the treatment of MTBE and benzene from contaminated groundwater in pilot or full-scale constructed wetlands are lacking hugely. The aim of this study was to develop a biological treatment technology that can be operated in an economic, reliable and robust mode over a long period of time. Two pilot-scale vertical-flow soil filter eco-technologies, a roughing filter (RF) and a polishing filter (PF) with plants (willows), were operated independently in a single-stage configuration and coupled together in a multi-stage (RF + PF) configuration to investigate the MTBE and benzene removal performances. Both filters were loaded with groundwater from a refinery site contaminated with MTBE and benzene as the main contaminants, with a mean concentration of 2970 ± 816 and 13,966 ± 1998 μg L−1, respectively. Four different hydraulic loading rates (HLRs) with a stepwise increment of 60, 120, 240 and 480 L m−2 d−1 were applied over a period of 388 days in the single-stage operation. At the highest HLR of 480 L m−2 d−1, the mean concentrations of MTBE and benzene were found to be 550 ± 133 and 65 ± 123 μg L−1 in the effluent of the RF. In the effluent of the PF system, respective mean MTBE and benzene concentrations of 49 ± 77 and 0.5 ± 0.2 μg L−1 were obtained, which were well below the relevant MTBE and benzene limit values of 200 and 1 μg L−1 for drinking water quality. But a dynamic fluctuation in the effluent MTBE concentration showed a lack of stability in regards to the increase in the measured values by nearly 10%, which were higher than the limit value. Therefore, both (RF + PF) filters were combined in a multi-stage configuration and the combined system proved to be more stable and effective with a highly efficient reduction of the MTBE and benzene concentrations in the effluent. Nearly 70% of MTBE and 98% of benzene were eliminated from the influent groundwater by the first vertical filter (RF) and the remaining amount was almost completely diminished (∼100% reduction) after passing through the second filter (PF), with a mean MTBE and benzene concentration of 5 ± 10 and 0.6 ± 0.2 μg L−1 in the final effluent. The emission rate of volatile organic compounds mass into the air from the systems was less than 1% of the inflow mass loading rate. The results obtained in this study not only demonstrate the feasibility of vertical-flow soil filter systems for treating groundwater contaminated with MTBE and benzene, but can also be considered a major step forward towards their application under full-scale conditions for commercial purposes in the oil and gas industries.
dauerhafte UFZ-Verlinkung
van Afferden, M., Rahman, K.Z., Mosig, P., De Biase, C., Thullner, M., Oswalt, P., Müller, R.A. (2011):
Remediation of groundwater contaminated with MTBE and benzene: the potential of vertical-flow soil filter systems
Water Res. 45 (16), 5063 - 5074 10.1016/j.watres.2011.07.010