Environmental Problems

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Now showing 1 - 4 of 4
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    The impact of microwave radiation in the processes of carbon dioxide absorption by chlorophyll-producing microalgae
    (Видавництво Львівської політехніки, 2020-02-10) Dyachok, Vasyl; Mandryk, Solomiia; Huhlych, Serhiy; Lviv Polytechnic National University
    The influence of microwave radiation on the rate of СО2 uptake by chlorophyll-producing microalgae of the Chlorella Vulgaris has been established. Experimental dependencies of greenhouse gases absorption by microalgae depending on the impact of microwave electromagnetic (MEM) field have been obtained. The mathematical model of the dynamics of biomass growth of Chlorella Vulgaris microalgae depending on the time of electromagnetic radiation has been constructed. Based on the mathematical model solution and the experimental data obtained, a chart of the dependence of CO2 absorption by microalgae of the Chlorella Vulgaris provided that microwave radiation is present, has been constructed. The optimal value of microwave electromagnetic radiation for the design of technological schemes for the industrial purification of gas emissions from carbon dioxide by biological method has been established.
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    Analysis of the environmental impact of unsorted cullet
    (Lviv Politechnic Publishing House, 2019-03-20) Hurets, Larysa; Kotolevets, Anastasiia; Miakaieva, Hanna; Miakaiev, Oleksandr; Sumy State University
    Prediction of cullet accumulation at municipal solid waste landfills was carried out by linear and multiple regression methods. Over time, the amount of waste at the landfills will increase and the soil condition will deteriorate due to Na+ leaching This is confirmed by the experimental study of leaching of sodium ions from the cullet surface of different fractions with pure water and solutions with pH = 4.8 and pH = 9.2.
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    Activator of carbon dioxide absorption by chlorophyll-synthesizing microalgae
    (Lviv Politechnic Publishing House, 2019-02-26) Dyachok, Vasil; Mandryk, Solomiia; Huhlych, Serhiy; Lviv Polytechnic National University
    The influence of nitrogen oxides on the СО2 uptake rate by chlorophyll-producing microalgae of Chlorella type was investigated. Experimental dependences of microalgae concentration growth over time under certain values of nitrogen oxides concentration in the culture medium were obtained. The mathematical model of microalgae biomass growth depending on nitrogen oxides concentration was developed. Based on the solution of the mathematical model and the obtained experimental data, the concentration of nitrogen oxides for the maximal microalgae growth was determined.
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    Modeling of sewer networks by means of directed graphs
    (Lviv Politechnic Publishing House, 2017-03-21) Berko, Andriy; Zhuk, Volodymyr; Sereda, Igor; Lviv Polytechnic National University
    The paper presents an analysis of the known theoretical models of drainage network of the city as directed graphs of different types. It is proved that ringing sewer networks increases reliability of their work and improves maneuverability and regulation of drainage system as a whole. A theory of solving the optimization problem “capacity – economic efficiency” was proposed to design optimization schemes for sewage system, using the straightdual algorithmproposed by Saharovych.