Studies to support the development of new generation capacities and related transmission Task 4 - Site selection Volume 1 –Main report
November, 2007 Page 42 (104)
amount of 1 m³/s (assumption 120 l/inhabitant/day), so in dry periods the total water flow of Sitnica may be more or less (untreated) wastewater only. For the assessment of Sitnica water quality, we got from INKOS on request data for 3 monitoring sites (i) upstream from the Kosovo A site between the influx of Drenica River and the discharge site from Mirash drainage, (ii) upstream and (iii) downstream from the influxes from Kosovo B facilities. Differences between these years are not interpretable, as no information on water flow is available; minimum values are not reported. No information on the monthly frequency on and selection criteria for the dating of monitoring is available. Table 5-9. Water pollution of Sitnica River 2005. upstream Kosovo A Parameters El. conductivity pH value Nitrate Nitrite Sulfate Chloride Oxygen BOD5 COD KMnO4 cons. Phosphors total Ammonia Suspended solids
units µS/cm mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l mg/l
aver. 535 7,95 4,1 0,15 63 13 6,4 2,7 3,1 10 0,18 1,9 110
max 600 8,6 8,7 0,62 89 43 8,8 3,7 4,4 53 0,56 3,8 240
between A + B aver. 670 8,1 3,4 0,18 127 22 7,3 3,9 3,4 19 0,23 1,2 140
max 755 8,85 9,6 0,85 193 37 9,6 7,6 5,8 38 0,97 4,7 205
downstream Kos. B aver. 535 7,6 4,1 0,23 63 31 6,9 2,7 3,0 20 0,24 2,1 110
max 600 7,9 9,0 0,95 89 43 8,9 5,7 8,1 41 0,89 4,1 240
Regardless of considerable doubts on the reliability of these data (see above), the values for sulphate and chloride are high, but still somewhat lower than the EU limits for raw water (see Table 5-4), suspended solids exceed the World Bank limit 4-fold and the proposed EU limit 10-fold. Conspicuous are the very low values for BOD5 (biological oxygen demand) and COD (chemical oxygen demand) despite of the freight of untreated domestic waste water to be expected (see above). Conspicuous is also that for some parameters (for example sulphate and suspended solids) the values for upstream and downstream are identical. Phenols are not reported whereas measured due to other sources, for example in November and December 2005 at Vragoli with 3,5 resp. 5,0 µg/l, i.e. 3,5 resp. 5 fold the EU limit value. Heavy metals are not analysed by INKOS. The data in Table 5-9 reflect only partially the expected increase of the water pollution of Sitnica River between entrance to and exit from KEK area and does not correlate with the data on discharges as described above. The data from INKOS suggests, in contrast to public opinion and publications of international organisations as well as our own ”educated guess”, a more or less moderate pollution of Sitnica River. In the voluminous data collection prepared by Carl Bro, 2003, we found results of analyses of Sitnica River water samples, collected by INKOS at well defined sites at 05.03.2003 and analysed by KFOR Preventive Medical Laboratory the same day. The sampling sites are located at: •
Vragoli river bridge upstream from Drenica influx
European Agency for Reconstruction Pöyry-CESI-Terna-Decon