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1D - Soil and Sediment Contamination (TUP/8) Release of Nonylphenol, Octylphenol, and Bisphenol A with Leachate from Municipal Landfill Simulation Reactors. Vogel, Dirk1, Gehring, Martin1, Tennhardt, Lars1, Weltin, Diethelm1, Bilitewski, Bernd1, 1 Dresden University of Technology, Pirna, Saxony, Germany ABSTRACT- Laboratory scale lysimeters have been operated using municipal waste obtained from a local landfill in order to simulate long term real life conditions. The objective is to determine the influence of aeration on the quality of the leachate. A potential large scale application at German landfills offers reduction of costs and timeframe of maintenance after closing a landfill. Waste of several horizons of depth and age was excavated from the landfill (operated from 1977 to 1998) and placed in four duplicate sets of lysimeters, each with a volume of 120 l. Leachate has been recirculated and samples have been collected weekly. At the beginning of the experiment Nonylphenol (NP) was only detectable in the drainage of waste disposed of after 1992. Over the period of anaerobic operation an increase of the NP concentrations in the leachate was observed. At the end of the anaerobic phase concentrations of NP were in the range of 300 to 1500 ng/l. After changing over to aerobic mode a slight decrease of the NP concentrations in the drainage occurred. In order to confirm this trend the analysis of the subsequent samples needs to be awaited. In contrast to NP Bisphenol (BPA) was detected in concentrations ranging from 65 to 1600 ng/l at the start of the experiment. A decrease of BPA release was observed at the end of the three months anaerobic phase. Moreover, BPA could not be detected in the drainage from waste disposed of before 1990. Generally, more BPA as well as NP was released from waste disposed of after 1992 compared to the leachate from older waste. Again, for confirmation of the trend the subsequent samples still need to be analysed. Key words: landfill leachate, xenoestrogens, endocrine disrupers |
