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Wastewater treatment in the city of Koprivnica

Based on the concept of sustainable development, water must be stored and protected for present and future generations. This also means saving the water trough wastewater treatment. The primary role of the wastewater treatment plants is to treat wastewaters up to a satisfactory level of quality as closer to the natural state. The central wastewater treatment plant (WWTP) of the City of Koprivnica treats wastewater including the tertiary wastewater treatment. Due to considerable fluctuations in wastewater volumes and loads, sequential batch reactor (SBR) technology was selected as the best solution for wastewater treatment. The final stage of treatment at the WWTP of the City of Koprivnica is the process of sludge treatment by aerobic stabilization, dehydration and MID-MIX technology, which produces a chemical inert powder – solidificate. Solidificate can be used in civil engineering or disposed of in a landfill without environmental impact. This paper analyses the physical-chemical indicators of wastewater quality (chemical oxygen demand - COD, biological oxygen demand - BOD5, total nitrogen, total phosphorus, suspended matter) on wastewater samples from the WWTP of the City of Koprivnica in a period from 2014 to 2016. The results indicated that the treated wastewater had a satisfactory quality and that the WWTP of the City of Koprivnica is working efficiently.

wastewater treatment ; Koprivnica ; physical-chemical water indicators ; water quality

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