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Ng, Kelsey; Alygizakis, Nikiforos; Nika, Maria-Christina; Galani, Aikaterini; Oswald, Peter; Oswaldova, Martina; Čirka, Ľuboš; Kunkel, Uwe; Macherius, André; Sengl, Manfred; Mariani, Giulio; Tavazzi, Simona; Skejo, Helle; Gawlik, Bernd M.; Thomaidis, Nikolaos S.; Slobodnik, Jaroslav
Water research (Oxford), 02/2023, Volume: 230Journal Article
•586 of the studied 2362 contaminants were detected in the Danube River Basin.•Risk assessment prioritized 12 legacy and 33 emerging contaminants.•The 33 emerging contaminants are Danube River Basin Specific Pollutants.•20 performance indicators were checked in wastewater treatment plants.•The plants showed medium or efficient removal for 70% of the studied compounds. A state-of-the-art wide-scope target screening of 2,362 chemicals and their transformation products (TPs) was performed in samples collected within the Joint Danube Survey 4 (JDS4) performed in 2019. The analysed contaminants of emerging concern (CECs) included three major categories: plant protection products (PPPs), industrial chemicals and pharmaceuticals and personal care products (PPCPs). In total, 586 CECs were detected in the samples including 158 PPPs, 71 industrial chemicals, 348 PPCPs, and 9 other chemicals. A wide-variety of sample matrices were collected including influent and effluent wastewater, groundwater, river water, sediment and biota. Forty-five CECs (19 PPPs, 8 industrial chemicals, 18 PPCPs) were detected at levels above their ecotoxicological thresholds (lowest predicted no-effect concentration (PNEC) values) in one or more of the investigated environmental compartments, indicating potential adverse effects on the impacted ecosystems. Among them 12 are legacy substances; 33 are emerging and qualify as potential Danube River Basin Specific Pollutants (RBSPs). Moreover, the efficiency of the wastewater treatment plants (WWTPs) was evaluated using 20 selected performance indicator chemicals. WWTPs showed effective removal (removal rate ≥80%) and medium removal (removal rate 25–80%) for 6 and 8 of the indicator chemicals, respectively. However, numerous contaminants passed the WWTPs with a lower removal rate. Further investigation on performance of WWTPs is suggested at catchment level to improve their removal efficiency. WWTP effluents are proven to be one of the major sources of contaminants in the Danube River Basin (DRB). Other sources include sewage discharges, industrial and agricultural activities. Continuous monitoring of the detected CECs is suggested to ensure water quality of the studied area. Display omitted
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