Publikacje

Abstract:

The study presents the results of tests aimed at determining variations in concentrations of polycyclic aromatic hydrocarbons and heavy metals (copper, cadmium, chromium, nickel, lead and zinc) in the sediments from the stormwater sewer system depending on the study period. The sediments were sampled in four periods that altogether extended over the hydrological year. They were collected from the settler chamber in the stormwater treatment plant located in the 804.6ha urbanised catchment. The results of investigations show differences in the sediment grain size distribution. The dust-clay fraction is dominant as it constitutes up to 84% of the samples. The remaining part of the samples is composed of the mineral material, mainly of the psammite fraction grains (3-25%) and organic material (10-13%). The results concerning the content of heavy metals show that the lowest values were found for cadmium, namely 0.8mgkg(-1), and the highest for zinc -627.9mgkg(-1). As regards organic pollutants, a growing trend in total concentrations of PAHs was observed over the study period. The initial concentration in the winter period was 48.1mgkg(-1), whereas in the last sampling session it was as much as 87.8mgkg(-1), which indicates a continuous accumulation of pollutants in the material. An attempt was made to classify the sediments taking into account the Regulation of the Minister of Environment on soil and land quality standards (J. of Laws No. 165, item 1359) and geochemical classification.

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Assessment of the degree of pollution of sediments from the rainstorm sewer system in the urbanized catchment