ROADSIDE RESERVOIRS OF RAIN WASTEWATER AS AN ELEMENT OF WATERS QUALITY PROTECTION
 
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Uniwersytet Rolniczy w Krakowie, Katedra Chemii Rolnej i Środowiskowej, Al. Mickiewicza 21, 31-120 Kraków
Publication date: 2014-10-19
 
Inż. Ekolog. 2013; 34:62–75
 
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ABSTRACT
This paper presents an assessment of the quality of rain wastewater from the drainage of the national road No. 4 between Sułków - Łysokanie and the impact of changes in the intensity of traffic on their content of Zn and Pb. Material consisted of samples of sewage flowing out directly of the road and collected in 16 reservoirs, located on both its sides, taken in July 2011 during the precipitation. Physicochemical parameters (pH, electrolytic conductivity, COD and total nitrogen and chloride) as well as zinc and lead were analysed. The results were compared with those obtained in 2007 and 2008 for wastewater of the same objects. There were found significant differences of physico-chemical parameters and of both metals content in the wastewater flowing into reservoirs and stagnant in them. The average concentration of metals in the wastewater flowing out of the road and accumulated in the reservoirs were similar, but showed less variability and lower maximum levels, so build reservoirs reached the intended target of retardation of water resources degradation. Comparing the waste collected in the same reservoirs in 2007-2011 showed that the average Zn concentration in rain wastewater draining from the road No. 4 has decreased since 2007, from 1.2 to 4 times, which should be regarded as a positive effect of reducing the amount of traffic vehicles, mostly trucks, after being put into use in 2009, the A4 motorway between Kraków-Szarów. The concentration of Pb since 2008 has not changed significantly, which may result from the fact that has not changed significantly traffic intensity, especially cars, which are moving residents of the area. The Zn concentration in the studied rain wastewater flowing out of the road was correlated with the value of COD, and in the case of reservoirs located on the south side of the road with the values of pH and COD. Pb concentration in the effluent flowing out of the road into all reservoirs and located on the north side was correlated with the volume of reservoirs and sealed surface and total their catchment area. Pb content in the wastewater flowing into reservoirs located on the south side of the road and gathered them was correlated with the value of COD, and stored in reservoirs on the northern side depend on the pH value.