https://dspace.bsmu.edu.ua/handle/123456789/1277 Mon, 13 Apr 2026 16:35:15 GMT 2026-04-13T16:35:15Z https://dspace.bsmu.edu.ua/handle/123456789/25761 Title: Evaluation of Water Quality of the Siret River by Zooperiphyton Organisms Authors: Rylskyi, Olexandr F.; Dombrovskiy, Konstantin; Masikevych, Yurij; Masikevych, Andrew; Malovanyy, Myroslav Abstract: Abstract. The extensive nature of natural resource use in the Siret River basin in recent years has led to a significant depletion of its water resources and deterioration of the ecological state of surface waters. The following paper presents the results of assessing the degree of water pollution of the Siret River. A number of biotic water quality indices were used for this purpose. In particular, the Trent Biotic Index (TBI) and the Biological Monitoring Working Party Index (BMWP), both of which use the density ratio of different macroinvertebrate taxa in the aquatic communities, and the Pantlé and Bucca saprobility index, which uses the absolute density and saprobility of indicator species of aquatic organisms. A comprehensive assessment of the aquatic ecosystem of the watercourse was carried out using the water pollution index (WPI). The biological indices were calculated on the basis of data on zooperiphyton communities formed on an artificial fibre media of the «VIYA» type. The VIYA fibre carrier was used for more accurate deter- mination of the species composition and quantitative characteristics of zooperiphyton communities in the studied river sections. The TBI index ranged from 5 to 6 (which corresponds to a water quality assessment of 'satisfactory'). The BMWP index ranged from 8 (very poor) to 32 (good), and the saprobicity index from 1.52 to 1.95 (good water quality). The WPI index at the control sites in the Siret River ranged from 4.6 (which corresponds to a water quality assessment of 'polluted') to 8.1 (which corresponds to a water quality assessment of 'extremely polluted'). Signifi- cant differences in the results of the assessment by different biotic indices indicate that these indices cannot be used as indicators for an exhaustive assessment of water quality using zooperiphyton. They can only be used as relative indicators for comparing the state of water pollution at different locations. The values of hydrochemical indicators of water quality at two observation posts of the river were analysed. The maximum permissible concentrations of nitrite ions, ammonium ions and suspended solids in the control sections of the river were found to be exceeded. Sun, 01 Jan 2023 00:00:00 GMT https://dspace.bsmu.edu.ua/handle/123456789/25761 2023-01-01T00:00:00Z https://dspace.bsmu.edu.ua/handle/123456789/25760 Title: On the issue of sanitary and hygienic condition of the river network of the Pokutsko-Bukovynian Carpathians Authors: Masikevych, Yu.; Masikevych, A.; Malovanyy, M. Abstract: Abstract. The sanitary-hygienic and microbiological condition of surface waters of the river network of the Pokutsko-Bukovynian Carpathians is analyzed. As a benchmark for comparing the impact of anthropogenic activities on the state of mountain ecosystems, we have chosen the protected areas of the Vyzhnytskyi National Nature Park (hereinafter NNP), where for more than two decades a specific ecosystem has been formed related to environmental protection. The main risks to the ecological safety of the hydrosphere of the studied region have been identified. Two types of ecological threats have been identified: microbiological pollution of streams and watercourses by domestic effluents and washes of polonyn farms and pollution of the hydrosphere by effluents of processing enterprises. Contamination of surface waters with organic residues is accompanied by a change in their hydrochemical composition and the level of contamination of indicative forms of bacteria. Based on the monitoring studies of the hydrosphere, the main threats were identified and engineering and technical and management solutions were developed to minimize the level of ecological danger of the mountain ecosystem. In order to improve the quality of surface waters of the river network, the use of special structures "ViKa", mounted on the basis of wooden structures of pulp and fibrous carrier "Via", as well as the use of a modified method of obtaining pellets and wood waste from adjacent loggers based on lignin soap. To reduce the inflow of discharges into the river network of alcohol enterprises, in the absence of centralized treatment facilities in the region, the method of waste treatment using a reagent method based on sodium hypochlorite was quite effective. It is shown that one of the ways to reduce the loss of the river network by wood waste may be the creation of facilities for the production of fuel pellets and briquettes in traditional economic landscapes. Sat, 01 Jan 2022 00:00:00 GMT https://dspace.bsmu.edu.ua/handle/123456789/25760 2022-01-01T00:00:00Z https://dspace.bsmu.edu.ua/handle/123456789/25759 Title: Comparative Evaluation of the Contact Elements Efficiency for Barium Sulfide Solution Carbonization Authors: Masikevych, Yurij; Tseitlin, Musii; Raiko, Valentyna; Shestopalov, Oleksii; Panasenko, Vladimir Abstract: Abstract. The article presents the results of an experimental study aimed at obtaining scientifically valid data on the kinetics of absorption of carbon diox­ ide by a barium sulfide solution and the effect of the design of contact elements (trays) on the mass transfer coefficient in this process. The work was carried out using a laboratory model of the absorber, in which it was possible to install trays of various types. Analysis of literature sources showed that the process of a BaS solution carbonization takes place in two stages, sharply differing in pH. An exper­ imental study of CO2 absorption kinetics under the conditions of the first stage of the process made it possible to identify the most significant factors influencing its rate. It was also found that the limiting stage of mass transfer is the resistance in the gas phase. The carbonization rate at the second stage is significantly lower than at the first stage and is controlled by the kinetics of the chemical reaction of CO2 hydration. Mathematical processing of the results of testing models of the cap, sieve, and double-flow trays made it possible to obtain formulas for calcu­ lating the mass transfer coefficients for each of them. In the studied range of gas velocities, the mass transfer coefficient on a dual-flow tray was 1.5-2 times lower than on a sieve tray and 2-2.5 times lower than on a cap tray. The data obtained were used in the design of the absorption apparatus. Sun, 01 Jan 2023 00:00:00 GMT https://dspace.bsmu.edu.ua/handle/123456789/25759 2023-01-01T00:00:00Z https://dspace.bsmu.edu.ua/handle/123456789/25758 Title: Microbiological pollution of soils and surface waters of the Pokuttia-Bukovyna Carpathians Authors: Masikevych, Andrij; Masikevych, Yurij; Malovanyy, Myroslav S.; Blyzniuk, Mykola Abstract: Abstract: Based on the analysis of a number of studies, it was found that to assess the state of the environment (including surface waters and soils) it is advisable to use indicators of microbiological pollution, which in general integrally reflect the state of the ecosystem. To assess the dynamics of changes in the pollution of the studied areas, a comparison of monitoring data with the corresponding level of pollution in protected areas (Vyzhnytsia National Nature Park) was used. Research methods included soil and surface water sampling, inoculation on appropriate nutrient selective media, counting of colony forming units (CFU) and other microbiological indicators. To assess the biological activity of soils, urease activity was determined by a method generally accepted in biochemistry. It is established that within the protected areas, despite some existing annual fluctuations, the relative stability of the studied indicators of the hydrosphere is preserved. Studies have shown that soils of anthropogenically altered landscapes are characterised by a high content of sanitary-indicative bacteria. As our research shows, according to the colony forming units (CFU), total microbial count, and titer of Escherichia coli, the soils selected in the protected area of the Vyzhnytsia National Nature Park correspond to the “pure” level. The soils of the territories out of the National Nature Park are characterised by high biological capacity, as evidenced by the level of activity of the enzyme urease and the ratio of the main forms of nitrogen compounds. Sat, 01 Jan 2022 00:00:00 GMT https://dspace.bsmu.edu.ua/handle/123456789/25758 2022-01-01T00:00:00Z