Mikrobiologische Biotopcharakterisierung im Zuge der in-situ-Sanierung des Altoelraffinerie-Standortes Pintsch Hanau Zusammenfassende Darstellung der Ergebnisse der quantitativen und qualitativen Erfassung des mikrobiologischen Zustandes (4 Wasserbeprobungen und eine Bodenbeprobung) vor, bzw. nach Einleitung von Sanierungsmassnahmen in den in-situ-Versuchsfeldern. Abschlussbericht

This report contains the results of all ground water analyses carried out on the grounds of the former used oil refinery Pintsch Hanau. It also includes a comparison of the microbiological characterization of the condition of the untreated soil as well as of the soil infiltrated with different chemicals of the in-situ test fields. The results of four water samples are compared to that of the soil samples and are discussed. Here particularly the microbiological/ecological changes during the rehabilitation process are described and explained in comparison to chemical parameters for the control of rehabilitation success. (orig./BBR)Der vorliegende Bericht beinhaltet die Ergebnisse aller bisher durchgefuehrten Grundwasseruntersuchungen auf dem Gelaende der ehemaligen Altoelraffinerie Pintsch Hanau und eine vergleichende Betrachtung der mikrobiologischen Zustandscharakterisierung des unbehandelten sowie des mit verschiedenen Chemikalien infiltrierten Bodens der in-situ-Versuchszellen. Die Ergebnisse der 4 Wasserproben werden mit den Ergebnissen der Bodenbeprobung vergleichend dargestellt und diskutiert. Dabei werden insbesondere die mikrobiologisch/oekologischen Veraenderungen waehrend des Sanierungszeitraums beschrieben und im Vergleich mit chemischen Parametern zur Kontrolle des Sanierungserfolgs erlaeutert. (orig./BBR)Available from TIB Hannover: F93B467+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Untersuchung zur Methodik von Sterilisationsverfahren sowie mikrobielle Ueberwachung von Sorptionsexperimenten. Sorptionsexperimente zur Beeinflussung der Radionuklidmigration durch mikrobielle Aktivitaeten am Beispiel des Technetiums und Selen Abschlussbericht

The knowledge about the influence of microbial activities on the radionuclide migration is not very extended up to now. The sorption behaviour of the redox sensitive radionuclides "9"5"mTc and "7"5Se was investigated under consideration of microbial metabolism and the development of bacterial populations in loose sediments. Recirculation column experiments (aerobe) were carried out as well as batch experiments (aerobe and anaerobe). Sterile experiments were compared with non sterile experiments. The investigation of sterilising methods with low impact on the physico chemical properties of sediments proved gamma irradiation to be the best choice. The addition of nutrients in batch experiments showed an immobilisation of Tc and Se combined with a decreasing redox value (Eh). Non sterile recirculation experiments showed a reproducible fixation of Tc and Se without any observed decrease of the redox value. The immobilisation occurred without any measurable alteration of the marco environment. These results are not understandable taking thermodynamic data into consideration. There was no fixation of Tc and Se within 95 days in sterile column experiments. The addition of micro-organisms isolated from the non sterile columns led to a decreasing redox values. The addition of biocide (5000 ppm NaN_3) to the non sterile columns resulted in a remobilisation of Tc but not of Se. To a great extend the micro-orgnisms identified within the non sterile columns were allochthonous. The immobilisation of Tc by living cells is much bigger than by autoclaved (dead) cells. A microbial population in the cap rock aquifers is highly probables as well as in the disposal site (after the excavation and filling period). The assessment of the cap rock aquifer's retardation capacity for the radionuclide migration may be overestimated not knowing the impact of the autochthonous microflora on those radionuclides interacting with micro-orgnisms. (orig.)SIGLEAvailable from TIB Hannover: F94B783+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman