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(80-73) Contaminants in sewage sludge from WWTPs in Baden-Wuerttemberg, Southwestern Germany. Part IV: Summary and assessment of the analytical results. Wizgall, Rolf2, Bolz, Ulrike*,1, Kuch, Bertram1, Sacher, Rolf3, Blankenhorn, Iris4, Metzger, Jörg1, 2 Ministerium für Umwelt und Verkehr Baden-Württemberg, Kernerplatz 9, Stuttgart, Germany1 University of Stuttgart, Institute of Sanitary Engineering, Water Quality and Solid Waste Management, Bandtäle 2, Stuttgart, Germany3 Technologiezentrum Wasser, Karlsruherstrasse 84, Karlsruhe, Germany4 Landesanstalt fuer Umweltschutz Baden-Wuerttemberg, Benzstrasse 5, Karlsruhe, Germany ABSTRACT- Recently the agricultural use of sewage sludge in Germany is controversially discussed. To get a survey on the fate of structurally diverse contaminants in sewage sludge, a monitoring was performed in order of Ministry of Environment and Traffic, Baden-Wuerttemberg, Germany. The results of the investigated substances are presented in part I to III. Sludge samples were taken from WWTPs with different technical equipments and capacities. The selection of the WWTPs followed according to their real distribution in Baden-Wuerttemberg. The 30 WWTPs include plants equipped with activated sludge process, trickling filter or a combination of both. The sludge is treated in different ways (e.g. sludge stabilisation, centrifugation, different filter presses, lime dosage). About 60% of the sludge samples were solid with a dry weight (d.w.) of 25 to 38% and 40% were liquid sludge samples (3 to 6% d.w.). In this part the analytical results of endocrine disruptors, flame retardants and pharmaceuticals were assumed and compared in the individual samples. Further the results were correlated to the technical parameters of the WWTPs. Key words: sludge from WWTPs in Baden-Wuerttemberg, endocrine disruptors, flame retardants, pharmaceuticals |
