CHANGES IN THE QUALITY OF SURFACE WATER OF THE STYR RIVER ON THE BACKGROUND OF THE CURRENT LEVEL OF ANTHROPOGENIC LOAD

Abstract

The results of researches of the ecological condition of the aquatic ecosystem of the river Styr, in the territory of Rivne region, which is subjected to anthropogenic load, are given. The formation of the chemical composition of surface waters occurs under conditions of excessive moisture under the influence of common carbonate rocks. Water is used for industrial (cooling of RNPP reactors) and domestic water supply, fish farming and recreation. Assessment of surface water quality was performed according to the data of hydrochemical control, which is included in the program of monitoring of water resources in Rivne region on the relevant areas of observations during 2015-2019. In 2015, the highest multiplicity of exceeding the MPC was recorded for such substances as copper, phosphates, zinc and nitrites. The worst was the quality of surface water in the area within the village. Ivanchytsia of Zarichne district and create below the village of Captive of Volodymyrets district – waters are "moderately polluted". The average values of the short circuit for the Styr River within the Rivne region in 2015 were 2.36 and corresponded to the level of “slightly polluted”. In 2016, the highest frequency of exceeding the standards was recorded for: copper, zinc, phosphates, nitrites and BSC5. The worst was the quality of surface water in the area within the village. Ivanchytsia of Zarichne district and create below the village of Grandmother of Volodymyrets district – the water is “dirty”. In other areas, the surface waters of the river were “moderately polluted”. The average values of the short circuit for the Styr River within the Rivne region in 2016 were 3.92 and corresponded to the level of “moderately polluted”. In 2018, the average values of short-range on the target was 2.26, which referred to the quality of surface water to the level of “moderately polluted”. The frequency of exceeding the standards was recorded only for copper and zinc. The highest multiplicity of exceeding the standards in 2019 was recorded for copper, phosphates, nitrites and zinc. It was found that the ecological state of surface waters of the Styr River within the Rivne region is significantly affected by substances of toxic (copper, zinc) and tropho-saprobiological (phosphates, nitrites) blocks. The transition from the level of “moderately polluted” to the level of “slightly polluted” water indicates the self-healing potential of the hydroecosystem in modern conditions of anthropogenic pressure.