| Autor: |
Gorecki, Krzysztof1 goral@up.poznan.pl, Ilnicki, Piotr1, Lewandowski, Piotr1, Farat, Ryszard2 |
| Předmět: |
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| Zdroj: |
Fresenius Environmental Bulletin. 2016, Vol. 25 Issue 12A, p5689-5702. 14p. |
| Abstrakt: |
The Warta River is the largest tributary of the Oder, the second largest river in Poland. The Warta drainage basin (54 519 km2) is characterised by intensive agriculture and high population density. This study has investigated the relative changes in concentration and load of nitrate nitrogen (NO3-N) and reactive phosphorus (PO4-P) in the rivers of the Warta basin. In this respect the water years for 1992- 2011 were taken into account - that is, from the beginning of the National Monitoring Programme in Poland. In the period under analysis, the quantity of untreated sewage that made its way into these waters fell while the effectiveness in treatment of sewage increased. Concentration and load of TN and TP in the period under research in the Warta River drainage basin diminished but the increase in sewage treatment using the biological method has meant a significant increase in concentration and load of NO3-N, especially in the flows of the Ner and to a lesser extent, Prosna and Warta (Oborniki) rivers. These rivers are host to sewage from Lodz, Kalisz and Poznan respectively. In rivers with a small number of pollution source points (Drawa, Notec, Warta mouth), a fall in concentration and load of NO3-N was observed. In the case of concentration and load of PO4-P there was noted a strong negative trend in all the analysed rivers, in particular marked in rivers with a large inflow of pollution point sources. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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