Abstract
In July and August 2022, the largest ecological disaster in history occurred on the Oder River. The scale of the catastrophe resonated widely in Poland and Europe. Over 700 tons of dead fish have been caught. Several reasons can be considered as the main cause of the disaster, from extremely low flows lasting over 80 days to exceeding the pollutant loads. The biggest surprise was the presence of biological organisms Prymnesium parvum in the water, which secrete toxins during their death. In this work, one of the potential causes of the rapid deterioration of water quality is presented. Sedimentological conditions that could potentially occur on the Odra River from June to August 2022 are presented. The main groups of pollutants that may be released from sediments to waters are indicated.
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