Regenerative Energie
Following an accident of a tank vehicle in Gmunden (Upper Austria) 2007, about 60,000 kg of diesel fuel were spilled and percolated into the soil. As an emergency measure soil was removed up to 3.2 m depth. Consecutively, information about investigation and remediation method selection as well as implementation details are given.
More then 30 core drillings brought information about underground situation and 3D-distribution of contamination. In addition, 3 groundwater wells were installed for monitoring purposes.
Based on the information of the investigations, it was possible to divide the contaminated area into an inner (central) section (about 1,400 m²) with higher contamination and a wider section (900 m²) with clearly lower concentrations.
Highest concentrations are located in the centre in depths between 1.5 to 5 m with an average concentration of 1,650 mg/kg KW-IR (aliphatic hydrocarbons). Downwards concentration is decreasing very fast, between 5 - 25 m an average concentration of 290 mg/kg was detected. In the wider area concentrations are generally lower, showing 290 mg/kg (0 - 5 m) and 180 mg/kg (5 - 25 m) respectively. The mass balance of contaminants shows that the whole amount of spilled hydrocarbons was detected.
Soil in the contaminated area is made up of more than 60 m in depth of glacial sediments (gravels and sands), which show a high degree of density. Beneath this sequence neogene marls (Schlier), are following, which work as aquiclude. The thickness of aquifer is low (1 - 3 m), pumping test gave hydraulic conductivities of about 3 x 10-3 m/s.
These favorable circumstances (large depth to water table, dense packing of sediment) supported the retention of hydrocarbons. During five years of groundwater monitoring, no hydrocarbons were detected.
Promising results of investigations regarding the permeability of soil for gases supported the idea of an in-situ-remediation. In addition, the potential of biodegradability in the contaminated zone was tested. It could be shown, that an already existing microbial population could lead to a decrease of hydrocarbons if a sufficient amount of nutrition was supplied.
| Copyright: | © Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben |
| Quelle: | Depotech 2012 (November 2012) |
| Seiten: | 4 |
| Preis: | € 2,00 |
| Autor: | Hartwig Kraiger Herwig Zehentner |
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