Natural bioattenuation and active remediation in a BTEX contaminated aquifer in Duesseldorf (Germany)

摘要

At a former gasworks plant in Diisseldorf (Germany) massive soil and groundwater contaminations with BTEX (up to 100 mg/l) and to a minor extent with PAH (up to 10 mg/l) were detected. Mainly due to sulfate and iron-(Ⅲ) reduction, a natural biodegradation has occurred and restricted the length of the contaminant plume in the direction of groundwater flow to only 600 m. The active remediation strategy at this site includes nitrate-enhanced in-situ bioremediation of the remaining contaminants in the plume.