In the subsoil of this industrial site there is damage with highly chlorinated hydrocarbons (tetrachloroethene). The contaminants extend into the groundwater-saturated zone (8-17 m a.s.l.). Due to the deep location of the contamination, the implementation of an in-situ remediation variant was in the foreground.
Considering the site characteristics, anaerobic dechlorination was chosen. A cosubstrate (in this case molasses) was injected as a carbon source via injection wells. This enabled anaerobic dechlorination of the tetrachloroethene.
The measure was continuously monitored by groundwater sampling. The groundwater-saturated area was successfully remediated. The unsaturated subsoil between 0-8 m a.s.l. will be remediated by excavation as part of a construction project.
Ecosens AG developed the remediation project and carried out a pilot test following the preliminary and detailed investigation required by the law on contaminated sites. During the remediation phase, Ecosens AG coordinated all third-party services (remediation company, drilling company, laboratory, etc.) and is responsible for the evaluation of the data, ongoing adjustments to the remediation process and the presentation of the data to the client and the authorities (AWEL).
