Grundwasser-Zirkulations-Brunnen (GZB) zur In-situ-Grundwassersanierung

In recent years experimental investigations regarding enhanced remediation of contaminated aquifers by employing vertical circulation flow systems were carried out at the Institute for Hydromechanics (IfH), University of Karlsruhe. These investigations were focused on large scale three-dimensional remediation experiments with a groundwater circulation well (GZB) at field-like conditions in the research facility VEGAS, University of Stuttgart. Small scale laboratory experiments in columns and a two-dimensional flume at the IfH as well as field experiments completed the multiple-scale investigations. The experimental results on different scales showed the dominance of the mass transfer processes on the in situ remediation of a contamination source and their dependence on the flushing intensity. The remediation progress could be explained and also predicted by the mass removal coefficient. The GZB is a robust and well controllable technology, whose operation could be adapted well to natural aquifer conditions and the physical-chemical properties of the contaminants. Developing different efficiency numbers results of the experiments and generally remediation variants could be evaluated due to their effect and expenditure.