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(T/EH127) Input/output balance of phenolic xenoestrogens in sewage treatment plants (STPs). Bolz, U.1, Körner, W.1, Hagenmaier, H.1, 1 ABSTRACT- Different phenolic chemicals including bisphenol A, which have been reported to mimic estrogenic effects, were analysed with GC/MS in different matrices to obtain information on their fate during wastewater treatment. Representative 24 hours samples of influent and effluent and the related sludge samples of two STP with different technical purification equipment were taken. The STP, which is equipped with activated sludge process has no anaerobic sludge stabilization but polymers are added as flocculting agent before centifugation and drying of the raw sludge (composite of the primary and secondary sludge). By analyzing the primary, secondary and the dried composite sludge we realized that the flocculating agents enhance the adsorption of substances like bisphenol A, being less lipophilic than 4-nonylphenol, onto sludge. The dried composite sludge showed considerable higher concentrations of the phenolic xenoestrogens than the other sludges. The other STP is equipped with trickling filter and anaerobic sludge stabilisation. The concentrations of the determined phenolic compounds of both STP in the various matrices were projected on daily input, output and sludge amount. Key words: Phenolic Xenoestrogens, sewage treatment plant, input, output |
