The purpose of this study was to identify the impact of wastewater treated in the mechanical & biological wastewater treatment plant in Saczyn upon quality of the water in the Pokrzywnica and recommend actions to be taken to improve cleanness of the surface waters. The analysis embraced identification of characteristics of the Pokrzywnica basin and an analysis of concentrations of selected physical & chemical components of its water and of wastewater treated in Saczyn in 2006–2007. The study also includes a description of treatment technologies applied in the said treatment plant along with photo records. The analysis of selected results of physical & chemical composition tests of the water in the Pokrzywnica was performed in reference to the measurement cross-section of the Porwita 8.0 km based on the criteria contained in the decree by the Minister of Environment (Rozporządzenie Ministra Środowiska z dnia 11 lutego 2004... Dz.U. z 2004 r., nr 32, poz. 284) on classification of surface and underground waters (due to absence of a new one, the analysis and evaluation of the water quality was carried out in accordance with the “cancelled” decree). An analysis of quality of the treated wastewater was performed according to the standards contemporaneously in effect: BZT5 – Jakość wody... PN-EN 1899-1:2002; ChZT-Cr – Oznaczanie... PN-74/C-04578:03, suspension – PB/ZAW-1/05 rev. 1 from 01.10.2005. In 2006–2007 significant exceedance was recorded in relation to the parameters specified in the water permit for the concentration of chemical components and oxygen index in treated wastewater (in 2006 the following parameters were exceeded – BZT5 by 25%, ChZT-Cr by 70.2%, general suspension by 66.0%, general nitrogen by 75.0%, general phosphorous by 118.0%). The water in the Pokrzywnica during the analysis period (2006–2007) belonged to quality class IV, i.e. water contaminated beyond standard (BZT5 2.93 and 2.40 mgO₂ dm⁺³, dissolved oxygen 8.18 and 8.28 mgO₂ dm⁺³, ChZT-Cr 27.3 mgO₂ dm⁺³ (2006), Kjeldahl nitrogen 1.265 and 1.07 mgN dm⁺³, general nitrogen 5.65 and 6.16 mgN dm⁺³, general phosphorous 0.201 and 0.89 mgP dm⁺³). It was found out that the wastewater treated in Saczyn exerted significant impact upon the quality of water in the Pokrzywnica. Modernization of the wastewater treatment plant in Saczyn should be continued taking advantage of the phosphorous precipitation process. Furthermore, the water and wastewater management should be improved accompanied by extension of biological filters along the Pokrzywnica.
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.