Hydroecological state of the Poltva river and its tributaries
Abstrakt
The Poltva river, the left tributary of the Bug, is the sewage collector within Lviv city, causing the severe pollution of its water. Therefore, research of water quality of the river is necessary.
During the 2012-2014 summer-autumn low-water season we have been studying water quality of the Poltva river and of its main tributaries. Water quality parameters are compared with the standards for fresh waters needing fish protection and with the standards for bathing water quality, valid in Ukraine and in the European Union. Assessment of rivers’ water quality is made on a basis of the Water Contamination Index.
In consequence of considerable excesses of water quality parameters the water of the Poltva river is characterized as «extremely dirty», according to Water Contamination Index, and also unsuitable either for bathing (cultural and community use) or for fish life.
The water of tributaries of the Poltva was «clean» or «moderately polluted» at the limit of «clean». Excesses of MAC of BOD5 were often observed, sometimes excesses of the norms of COD and of nitrites were found. The insufficient content of the dissolved oxygen under the European rules in the tributaries was discovered.
Słowa kluczowe
Bibliografia
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