Water Quality in Slovenia - Agencija RS za okolje
Water Quality in Slovenia - Agencija RS za okolje
Water Quality in Slovenia - Agencija RS za okolje
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24<br />
W A T E R Q U A L I T Y I N S L O V E N I A<br />
The improvement of the saprobic quality of rivers is <strong>in</strong>dicated throughout the entire period from<br />
1996 to 2005. The number of monitor<strong>in</strong>g sites <strong>in</strong> quality classes 1 and 2 is <strong>in</strong>creas<strong>in</strong>g, and the number<br />
of monitor<strong>in</strong>g sites <strong>in</strong> lower quality classes is decreas<strong>in</strong>g (Chart 4).<br />
Chart 4: The saprobic status of rivers – the proportion of monitor<strong>in</strong>g sites <strong>in</strong> a specific quality class <strong>in</strong> the years<br />
1996 to 2005<br />
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An improvement <strong>in</strong> the Ljubljanica at the monitor<strong>in</strong>g site Zalog, follow<strong>in</strong>g the activation of the<br />
central wastewater treatment plant <strong>in</strong> Ljubljana <strong>in</strong> July 2005, should be noted. The improvement is<br />
<strong>in</strong>dicated by the results of saprobic analyses of benthic <strong>in</strong>vertebrates that primarily show the impacts<br />
of organic pollution (Chart 5). The f<strong>in</strong>d<strong>in</strong>gs are supported by the results <strong>in</strong>dicat<strong>in</strong>g the biochemical<br />
and chemical oxygen demand, which also reflect the organic pollution (Chart 6).<br />
Chart 5: <strong>Water</strong> quality of the Ljubljanica <strong>in</strong> Zalog <strong>in</strong> the years 1991 to 2006 accord<strong>in</strong>g to the saprobic <strong>in</strong>dex based on<br />
benthic <strong>in</strong>vertebrates<br />
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