The 21st International Conference “Man and Working Environment”
SAFETY ENGINEERING & MANAGEMENT SCIENCE, INDUSTRY, EDUCATION (SEMSIE 2025)   
PROCEEDINGS OF PAPERS 
25-26 September 2025, SOKOBANJA, SERBIA  

Ljiljana Takić , Ivana Mladenović-Ranisavljević , Violeta Stefanović 

REVIEW PAPER

ENVIRONMENTAL PROTECTION BY PRESERVING THE REQUIRED QUALITY OF SURFACE WATER

DOI: 10.46793/SEMSIE25.181T
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Abstract:

The paper provides an assessment of the water quality of the Danube River at the measuring station of Novi Sad as a function of oxygen consumption indicators in surface waters (BOD₅ and NH₄–N). The aim is to achieve the principle of sustainable water management of the Water Framework Directive (WFD). For surface waters, the main goal of the WFD is to achieve "good status", i.e., class II of ecological status of water quality, which shows a low level of changes in the ambient state of the environment. The calculated values of environmental protection indicators (BOD₅ =2.6 mg/l and NH₄–N =0.08 mg/l) at the observed measuring station place the water quality of the Danube into the required class II of the ecological status. The ecosystem approach indicates that the concentrations of the observed parameters BOD₅ and NH₄–N correspond to the target values of the required water quality of the Danube as an integral part of the environment.

Keywords:

Environment, indicators of oxygen consumption, the Danube

ACKNOWLEDGEMENTS:

This paper is supported by the Ministry of Science, Technological Development and Innovation of the Republic of Serbia pursuant to agreement № 451-03-137/2025-03/ 200133 with the University of Niš, Faculty of Technology.

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