Environmental Problems
Permanent URI for this communityhttps://ena.lpnu.ua/handle/ntb/33081
Browse
9 results
Search Results
Item Drying of cenospheres recovered by the wet-based method from coal fly ash for their rational use(Видавництво Львівської політехніки, 2023-02-28) Kindzera, Diana; Atamanyuk, Volodymyr; Hosovskyi, Roman; Mitin, Ihor; Lviv Polytechnic National UniversitySince slag and coal fly ash (CFA) are major global pollutants produced by thermal power plants (TPPs), special attention should be paid to their rational disposal. Scanning electron microscopy (SEM) was used to study the morphology of CFA and it was suggested that the use potential of CFA is high due to the presence of a large number of cenospheres (CSs), that can be recovered mostly by wet methods for the production of the wide range of products with improved properties. However, such decisions regarding the application of the cenospheres are largely related to the problem of their drying after removal. The article is devoted to the investigation of the filtration method as less energy-consuming for the drying of cenospheres. The effect of the drying agent velocity on the mass transfer intensity has been established. The values of mass transfer coefficients have been calculated based on the thin-layer experimental data and equation . Calculated mass transfer coefficients for cenospheres have been correlated by the dimensionless expression , based on which equation has been proposed to calculate the mass transfer coefficients, which is important at the filtration drying equipment design stage.Item Improvement of the municipal solid waste disposal system in Ukraine, on the example of the town of Chortkiv, Ternopil region(Видавництво Львівської політехніки, 2021-06-01) Ratushniak, Maryna; Tymchuk, Ivan; Berezyuk, Dariya; Malovanyy, Myroslav; Lviv Polytechnic National UniversityToday, in Ukraine, there is a problem with solid waste disposal, especially in small towns. The lack of a developed system for the collection and disposal of solid waste, the presence of natural landfills instead of equipped landfills lead to the fact that small towns are abandoned. Therefore, the creation of a new solid waste management policy is an acute problem for these towns and villages. This article is devoted to analysing the global experience of solid waste management and, based on that, formulating recommendations for solid waste management in small towns using Chortkiv as an example.Item Application of slag from thermal power plant for the production of porous filler(Видавництво Львівської політехніки, 2021-06-01) Mitin, Ihor; Kindzera, Diana; Atamanyuk, Volodymyr; Lviv Polytechnic National UniversityThe article is devoted to obtaining a porous filler from the slag of the Thermal Power Plant and investigation of the filtration method for the drying of slag and clay as main raw materials for preparing the charge for porous filler production. The possibility of using TPP slag as the raw material for the production of porous filler has been proved. The main benefits of using such wastes in the production process are environmental protection, conservation of raw resources for the production of finished products. According to the results of the research, insignificant values of the pressure drop confirm the application feasibility of the filtration drying as an energysaving method of the drying of slag and clay for preparing the charge for porous filler production. The influence of the temperature of the drying agent in the range from 313 to 373K on kinetic during filtration drying of slag and clay has been established. Obtained results are useful for the organization and intensification of the filtration drying process of slag and clay as the preliminary stage at the porous fillers production line. The qualitative new porous filler with the bulk density of 230 kg/m3 , the specific heat of 0.82 kJ/kg∙K, the thermal conductivity of 0.067 W/m∙K and compressive strength of 27.7 MPa has been obtained which can be used for the production of lightweight concretes.Item Apparatus-technological scheme of tin cans scrap recycling with obtaining technical products(Видавництво Львівської політехніки, 2021-03-03) Dmitrikov, Valerii; Vakal, Serhii; Vakal, Viktoriia; Pliatsuk, Leonid; Poltava State Agrarian Academy; Scientific-Research Institute of Mineral Fertilizers and Pigments of Sumy State UniversityThe article is devoted to the study of reducing the technogenic load on the environment due to the integrated processing of household metal scrap. A waste-free, resource saving, and environmentally safe method is proposed for extracting technical products from tin cans scrap – iron (III) oxide, tin (II) complex, suitable for further use, a mixture of ammonium and sodium nitrates as fertilizer for agriculture. As a result of theoretical and experimental studies, the direction of cans scrap recycling was selected with an assessment of the parameters and factors affecting the reagent process of scrap disposal. To verify the proposed method for can scrap processing in experimental studies, the reagent method and physical modeling were used together. The processes of the reagent can scrap recycling were studied in a laboratory installation. The results of studies on the reagent can scrap processing with the individual component allocation in the form of their derivatives are presented. A block diagram and a hardware-technological scheme for scrap processing with the receipt of technical products have been developed. The possibility of processing other metal-containing wastes according to the proposed scheme is shown.Item Clean utilization of municipal solid wastes and alternative fuels derived from it(Видавництво Львівської політехніки, 2020-10-10) Topal, Alexander; Holenko, Iryna; Haponych, Luidmyla; Coal Energy Technology Institute of National Academy of Sciences of UkraineFor the municipal solid waste (MSW) to be used in a proper way, it is necessary to implement clean technologies capable of thermal treatment of MSW and RDF in order to produce heat and electricity while meeting current ecological requirements. Nowadays, a number of technologies for MSW/RDF thermal treating are being used worldwide. Among them, the most proven technologies, applicable for industrial introduction, have been considered while analyzing their advantages/ disadvantages accounting for local conditions of Ukraine.Item Waste management problems in the Ternopil region(Видавництво Львівської політехніки, 2020-02-24) Struchok, Volodymyr; Ternopil Technical National University named after Ivan PulyuyThe National Strategy and the National Waste Management Plan in Ukraine until 2030, the regional program for solid waste management in the Ternopil region for 2018– 2020 on the reality of conducting key infrastructure measures and achieving the desired result for society are studied. An improved version of the solid waste management scheme in the Ternopil region and a suitable scheme for solid waste management in the city of Ternopil within the regional complexes for the municipal waste recovery are proposed and the sources of their financing are substantiated.Item Wood wastes utilization of the Pokuttia–Bukovyna Carpathians as the result of introduction of improved production technology of fuel briquettes(Lviv Politechnic Publishing House, 2019-02-26) Masikevych, Andriy; Kolotylo, Mykhailo; Bat, Roman; Masikevych, Yuri; Malovanyy, Myroslav; Atamanyuk, Volodymyr; Petrushka, Kateryna; Bukovinian State Medical University; National Natural Park “Vizhnitsky”; Lvivskyy Beton; Lviv Polytechnic National UniversityEcological danger from uncontrolled accumulation of arboreal wastes in the region of Pokuttia– Bukovyna Carpathians has been estimated. The optimum terms of wood wastes drying in an immobile layer have been studied. The optimum conditions for getting fuel brequettes from wood wastes by the pressing method havw been set. Lignin-containing industrial wastes have been used as a relating component. The principal technological scheme has been offered for fuel granules production from wood wastes by the pressing method.Item Investigation of the method of chemical desorption for extraction of nikel ions (II) from bentonite clays(Lviv Politechnic Publishing House, 2017-11-12) Sakalova, Galyna; Vasylinycz, Tamara; Koval, Nataliya; Kashchei, Viktoriia; Vinnytsia State Pedagogical University named after Mykhailo KotsiubynskyThe problem of accumulation of spent sorbents is considered in the article; The main methods of desorption of pollutants and regeneration of sorbents are described; the effectiveness of the method of chemical desorption for extracting Nikel ions (II) from bentonite clays is investigated; the main ways of utilization of spent sorbents are considered.Item Investigation of the method of chemical desorption for extraction of nikel ions (II) from bentonite clays(Lviv Politechnic Publishing House, 2017-11-12) Sakalova, Galyna; Vasylinycz, Tamara; Koval, Nataliya; Kashchei, Viktoriia; Vinnytsia State Pedagogical University named after Mykhailo KotsiubynskyThe problem of accumulation of spent sorbents is considered in the article; The main methods of desorption of pollutants and regeneration of sorbents are described; the effectiveness of the method of chemical desorption for extracting Nikel ions (II) from bentonite clays is investigated; the main ways of utilization of spent sorbents are considered.