Sustainable Use and Management of Soil, Sediment and Water Resources
9–12 June 2015 • Copenhagen, Denmark
Tour 1C: Pollution in limestone aquifers- challenges and Remediation Methods
In the eastern part of Denmark, the limestone, which is used for drinking water extraction, is relatively close to the surface, 1-15 m below surface. This means that contaminants are easily transported to the limestone and therefore pose a large risk the drinking water quality. To make a proper risk assessment and to plan the following remediation it is necessary to understand the transport processes in the limestone. These processes are very complex and not yet fully understood. A common remediation method at limestone sites is Pump and Treat (P & T) where pollution is fixed by pumping. However, this method has a large time scale (> 80 years) and high total costs. Therefore new remediation methods are needed.
1’st stop - Karlstrup Limestone Quarry
On this tour we will visit Karlstrup Limestone Quarry where we will see limestone surfaces. At this beautiful site we will see the complexity of the limestone e.g. how flint bands are bedded and fractures distributed. We will try to understand the mechanisms that control solute transport in a limestone formation.
2’nd stop - Pump and Treat facility
We will continue the tour at a contaminated site where a pump and treat solution has been operating to keep the plume under hydraulic control. To make the method more sustainable the extracted water is used as cooling water at a local factory.
3’rd stop – ISCO using ozone
The final stop on the tour will be at a site where in-situ chemical oxidation using ozone is tested for treatment of chlorinated solvents in the limestone. We will hear about the challenges connected to the introduction of ozone in the limestone. It is the first time this remediation method is tested in limestone in Denmark.
In the bus we will have more details of the two contaminated sites.