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1A - Environmental analytical methods (MOP/4) Budget of water dissolved POPs in municipal wastewater treatment plant. Bergqvist, Per-Anders1, Augulyte, Lijana1, 2, Zaliauskiene, Audrone3, 1 Umeå University, Umeå, Sweden, Sweden2 Kaunas University of Technology, Kaunas, Lithuania, Lithuania3 Exposmeter AB, Tavelsjö, Sweden, Sweden ABSTRACT- During earlier studies the flow of dissolved POPs in the wastewater treatment plants indicated differences between incoming and outgoing water concentrations. Several compound classes increased in effluent concentration during the flow through the treatment plant. Although e.g. total PAHs decreased while heavy PAHs increased in dissolved water concentration. This project studied the truly dissolved water concentrations of POPs at several different sites inside the Umea wastewater plant. Gas chromatography/mass spectrometry analysis of PAHs, PCBs, chlorinated pesticides and MUSK compounds were performed at several sites. In order to calculate the budget for dissolved compounds in the water phase, samples were taken before and after each of the involved treatment steps in the municipal wastewater treatment plant. The results are evaluated regarding the partitioning of different compounds between water and other phases as well as toward possible degradation and formation of compounds. The concentrations are corrected for biofouling and possible build up of sludge particles on the surface of the membranes, by the use of several different performance reference compounds (PRCs). The PRCs are added to the semipermeable membrane devices (SPMDs) before the exposure and, thus the sampling efficiency is corrected according to the loss of the PRC compounds. Key words: SPMD, bioconcentration, Municipal wastewater, POP |
