Neue Verfahren und Methoden zur Sanierung von Altlasten - am Beispiel der Deponie Georgswerder, Hamburg. T. 4: Verfestigungsverfahren fuer Sonderabfaelle Schlussbericht

For the rehabilitation of the Hamburg-Georgswerder landfill, the oil phases of the former oil ponds (pond oil) and those phases seeping out of the embankment (seepage oil) represent a major problem because of the high content of organic pollutants (e.g. 2,3,7,8-TCDD). As a rehabilitation measure for pond and seepage oil, solidification is a possible technique which was investigated in this project. A variety of additives was tested including inorganic and organic binders, fillers and, in some experiments, also surfactants. The solidified materials were tested for mechanical stability using different standard procedures. As a central aspect of this study, different elution testing procedures are compared and discussed. The results of these tests demonstrate that model oil can be absorbed by brown coal dust in such a way as to almost completely inhibit volatile oil constitutents and other toxic organic pollutants from being mobilized. This is also evident from sorption/desorption equilibria. The results indicate that besides hydrophobic interactions other bonding mechanisms (e.g. chemical forces) also become effective. The solidified material was of an earth-like texture and satisfied the requirements for dumping. Unlike organic solids, inorganic fillers or binders were in no case able to yield a satisfying incorporation and immobilization of organic pollutants. (orig.)SIGLEAvailable from TIB Hannover: QN 82(4)+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany); Umweltbehoerde, Hamburg (Germany). Amt fuer AltlastensanierungDEGerman