ABSTRACT
A large-scale laboratory experiment was performed in order to determine the long-term dissolution behavior of BTEX and PAHs form creosote in residual phase and from creosote in pools. The pool dissolution experiment allowed to determine transverse vertical dispersivities, which showed good agreement when derived form vertical concentration profiles or from the overall fluxes. The contaminant concentrations during dissolution of the creosote blobs compared well with predictions based on Raoult’s law and the equilibrium retardation of the dissolution front in the smear zone. Typical time scales of BTEX and PAH-dissolution from residual NAPL in the smear zone are in the order of weeks to months. In contrast, the removal of PAHs from the creosote pool takes decades to centuries due to the small transverse dispersivities of less than 0.2 mm.
