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1D - Soil and Sediment Contamination () Elimination of Endocrine Disrupting Compounds during different Sewage Sludge Treatment Processes. Tennhardt, Lars1, Gehring, Martin1, Vogel, Dirk1, Weltin, Diethelm1, Bilitewski, Bernd1, 1 Dresden University of Technology, Dresden, Saxony, Germany ABSTRACT- The elimination of several estrogenic phenolic xenobiotics and natural and synthethic steroids has been studied during a variety of sewage sludge stabilisation processes. The technologies applied included aerobic and anaerobic methods at different temperature levels. As known from the literature, the alkylphenols 4-nonylphenol and 4-tert-octylphenol were formed under anaerobic conditions probably from long chain anionic tensides. A distinct increase of the concentration of bisphenol A, a monomer for polycarbonates and epoxy resins, from raw to digested sludge was observed as well. This phenomenon was not described in the literature before. Under aerobic psychrophilic conditions, a high concentration decrease rate was observed for all substances studied. Results of mesophilic laboratory digestion experiments and field samplings will be compared with those of aerobic laboratory experiments under psychrophilic and thermophilic conditions. Considering the actual extent of the full-scale application of different sewage sludge stabilisation methods, the emissions of the endocrine disrupting compounds under investigation with sewage sludge and treated wastewater to the aquatic and terrestrial environment are calculated. The potential for reducing these emissions is estimated. Key words: Endocrine Disruptors, Xenoestrogens, Wastewater, Sewage Sludge |
