| Autor: |
Åkesson S; Department of Geology, Lund University, Sölvegatan 12, 223 62, Lund, Sweden. sofia.akesson@geol.lu.se., Sparrenbom CJ; Department of Geology, Lund University, Sölvegatan 12, 223 62, Lund, Sweden., Paul CJ; Applied Microbiology, Department of Chemistry, Lund University, P.O. Box 124, 221 00, Lund, Sweden.; Water Resources Engineering, Department of Building and Environmental Technology, Lund University, P.O. Box 118, 221 00, Lund, Sweden., Jansson R; Department of Geology, Lund University, Sölvegatan 12, 223 62, Lund, Sweden., Holmstrand H; Department of Environmental Science (ACES), Stockholm University, Svante Arrhenius väg 8, 106 91, Stockholm, Sweden. |
| Abstrakt: |
A site in mid-western Sweden contaminated with chlorinated solvents originating from a previous dry cleaning facility, was investigated using conventional groundwater analysis combined with compound-specific isotope data of carbon, microbial DNA analysis, and geoelectrical tomography techniques. We show the value of this multidisciplinary approach, as the different results supported each interpretation, and show where natural degradation occurs at the site. The zone where natural degradation occurred was identified in the transition between two geological units, where the change in hydraulic conductivity may have facilitated biofilm formation and microbial activity. This observation was confirmed by all methods and the examination of the impact of geological conditions on the biotransformation process was facilitated by the unique combination of the applied methods. There is thus significant benefit from deploying an extended array of methods for these investigations, with the potential to reduce costs involved in remediation of contaminated sediment and groundwater. |
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