Effect-based impact monitoring of the Dünnern before and after the upgrade of the Falkenstein WWTP

The Falkenstein WWTP in Oensingen is to be upgraded, including the addition of stages for membrane filtration and treatment with powdered activated carbon. The water quality of the Dünnern, into which the WWTP discharges, will be comprehensively analysed before and after the upgrade of the WWTP in order to monitor its effectiveness. The Ecotox Centre and its partners are using numerous bioassays and biomarkers for this purpose, while Eawag is also investigating the occurrence of antibiotic-resistant bacteria.

Biotests/biomarkers used

• ER-CALUX® with a genetically modified cell line for the determination of estrogenic substances
• Combined algae test with unicellular green algae
• Reproduction test with daphnia
• Analysis of the species community of oligochaetes (genetic oligochaete index)
• Gene expression in gammarids
• Gene expression in fish cell lines
• Occurrence of antibiotic resistance