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The topic of the present study was the investigation of a new hydraulically controlled and site-directed in-situ remediation technique for CHC. This new technology is a combination of the techniques of alcohol flushing and the groundwater circulation well (GCW). The combination of these two is highly promising concerning the controlled mobilisation and the site-directed remediation. The circulation flow field of the GCW is used for the hydraulic control of the flow regime and for the effective and site-directed regulation of the mass transport. The alcohol flushing uses the favourable chemical and physical properties of the alcohol to make the organic contaminant more soluble.
In the stability-diagram, stable and instable regions could be identified for a buoyancy pressure influenced layer caused by a special injection of the alcohol. In several two dimensional experiments with confined homogenous aquifer conditions the stability-diagram as well as the hydraulically controlled WAC on the basis of the relevant pressure differences could be established. Heinrich, K.E. "Hydraulische Steuerung einer Wasser-Alkohol-Zirkulation mittels Grundwasser-Zirkulations-Brunnen", 2006, Dissertation, Universität Karlsruhe, S. 9;
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