Mull und Partner Ingenieurgesellschaft Osnabrück is carrying out a comprehensive refurbishment.

On the premises of a former metal processing company, the handling of degreasing solvents led to the contamination of the groundwater with volatile chlorinated hydrocarbons (mono damage with CHCs). Production sludge residues were also deposited on the site, which led to contamination of the soil and groundwater with CHCs, alkylated benzenes, polycyclic aromatic hydrocarbons (PAHs), mineral hydrocarbons (MHs) and chlorofluorocarbons (CFCs) (multi-damage). From both sources of contamination, plumes of LCKW pollutants formed in the groundwater, which merge in the downstream flow and move towards a drinking water protection area.

Following extensive remediation investigations and the preparation of a remediation plan, the remediation work is now being carried out. The contaminant plumes in the outflow are captured using the classic pump & treat method. The pumped water is purified using activated carbon units with an upstream multi-layer gravel filter and discharged into the nearby receiving water.

The sources of contamination on the former factory site are being remediated by excavating the unsaturated soil zone and using innovative remediation methods. In the in-situ chemical oxidation process (ISCO), which is used in the multi-damage site, an oxidising agent is used to break down the pollutants. The mono LCKW damage is remediated using the biological ENA process, in which degradation takes place through microbial anaerobic dechlorination. In both processes, hydraulically supported circulation flow cells are created by injecting the active substances into the groundwater and withdrawing them to increase the effect in the groundwater. The use of innovative remediation methods drastically reduces the remediation period from several years to decades to several months to a few years.

The well construction, pipeline construction and installation of the groundwater purification system to clean up the combined contaminant plume already started in April.

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