4.7 Article

Micropollutants in urban wastewater: large-scale emission estimates and analysis of measured concentrations in the Baltic Sea catchment

Journal

MARINE POLLUTION BULLETIN
Volume 178, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2022.113559

Keywords

Chemical pollutants; Organic contaminants; Metals; Wastewater treatment plant; Effluent; Mass load

Funding

  1. Nordic Council of Ministers
  2. Interreg Baltic Sea Region Programme

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This study compiled data on chemical substances in the effluents from wastewater treatment plants in the Baltic Sea region, assessed the differences between countries, and estimated the inputs of micropollutants to the Baltic Sea catchment. The study provides useful data for environmental risk assessments and pressure analysis, but also highlights the need for broader monitoring of micropollutants in wastewater.
Wastewater treatment plants (WWTPs) transmit many chemical contaminants to aquatic environments. Quantitative data on micropollutant emissions via WWTPs are needed for environmental risk assessments and evaluation of mitigation measures. This study compiled published data on substances analysed in effluents from WWTPs in the Baltic Sea region, assessed country related differences in the data sets and estimated micro pollutant inputs to the Baltic Sea catchment. Concentration data were found for 1090 substances analysed at 650 WWTPs. Heterogeneity and low number of data points for most substances hindered adequate comparisons of country specific concentrations. Emission estimates were made for the 280 substances analysed in at least five WWTPs in years 2010 to 2019. For selected substances, mass loads were compared to previously published estimations. The study provides data useful for national and Baltic Sea-scale pressure analysis and risk assessments. However, it also highlights the need for broad scope monitoring of micropollutants in wastewater.

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