Archives of Environmental Protection

Abstract

Due to insuffi cient operation effi ciency, the studied treatment plant has undergone modernization. The aim of this study was to assess whether this modernization improved quality of the STP effl uent and water quality in the receiver. The research period of fi fty months covered time before and after the modernization. Samples were collected in four sites -upstream and downstream of the STP and by the sewage discharge. Electrolytic conductivity, water temperature and pH were measured onsite. Chemical analyzes were based on ion chromatography and determined the concentration of NH 4