Influence of the nitrification stage of biological treatment to the levels of nitrogen compounds in wastewater treatment

The growing urban population in the cities consequently leads to a steady increase in activities in industrial sector, especially in agriculture and farming, thus influence the increased sewage and wastewater generation, respectively. These activities, pose a threat to human health, generating excessive content of pollutants with different chemical compositions in wastewater. Among many pollutants, the ones with bonded nitrogen atoms in form of organic compounds, ammonia and nitrite/nitrate ions, interconvert in wastewaters causing an eutrophication of the aquatic eco-systems (Wang et al., 2010). Furthermore, reduction of nitrates into nitrites is associated with nitrosamines generation, which increase the prevalence of liver cancer, for example (Hosseini et al., 2011). The extent of the wastewater treatment is estimated based on the correlation of the inlet parameters of an influent (wastewater before treatment) and the outlet parameters of an effluent (treated wastewater). The extend of fluctuation in water flow, chemical composition and temperature, due to weather conditions annual variations, impacts the capacity for chemical and biological treatment of wastewater in the wastewater treatment plant. Designing mathematical models based on Linear Regression analyses using the correlated data sets of influent and effluent offer opportunity for prediction SWOT analyses for the efficiency of treatment of the nitrogen compounds (The Nitrates Directives 91/676/EEC) in the wastewater that obey to biological treatment (Morsy et al., 2020). The presented study reveals how the monitoring of the water quality of the surface watercourses across the municipality of Kumanovo.