Environmental Problems

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Author: search.filters.author.Dyachok, VasilHas files: Yes

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    Effect of Lemna minor population density on bioelectric parameters of electro-biosystems
    (Видавництво Львівської політехніки, 2021-06-01) Rusyn, Iryna; Dyachok, Vasil; Lviv Polytechnic National University
    The article presents a study of the influence of Lemna minor population density on the bioelectric potential and current of model electro-biosystems in the laboratory conditions using 500 and 1000 Ω resistors and in the open circuit. The positive effect of increasing the density of duckweed plants populations from 60 to 120 fronds/ml on the growth of bioelectric parameters of model electro-biosystems under load conditions and without resistors was revealed. Increasing the amount of duckweed biomass is a factor of enhancing the efficiency of electro-biosystems based on L. minor.
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    Bioelectric parameters of Pinus silvestris forest ecosystems
    (Видавництво Львівської політехніки, 2021-06-01) Rusyn, Iryna; Dyachok, Vasil; Lviv Polytechnic National University
    The article presents the study of the bioelectric potential of forest biotopes of Pinus silvestris to evaluate the possibility of their usage as a bioelectricity source. The increase of bioelectric potential in dry soils independent of moisture level was revealed. The positive effect of soil humidity on the generation of bioelectric potential was shown. Insignificant daily and seasonal fluctuations of bioelectric parameters of forest biotopes open their prospects as an important source of renewable energy.
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    To the problems of wastewater treatment from mineral pollutants with the use of microalgae
    (Видавництво Львівської політехніки, 2021-03-03) Dyachok, Vasil; Mandryk, Solomiia; Huhlych, Serhiy; Lviv Polytechnic National University
    This article presents the results of experimental studies on the use of Chlorella microalgae for wastewater treatment from the most common mineral pollutants. The influence of the mineral pollutants, namely anions HSO , NO , H PO on the dynamics of wastewater treatment has been established. Analytical dependences of microalgae biomass growth rate depending on pollutant concentration HSO , NO and H PO are obtained. The values of biomass growth coefficients at the corresponding pollutant concentrations are determined. Based on the obtained experimental research results, mathematical models have been constructed that allow predicting the maximum values of mineral pollutants concentrations at which effective wastewater treatment by chlorophyllsynthesizing microalgae is possible. The technological scheme of wastewater treatment from mineral pollutants and the mechanism of the obtained application biomass are proposed.
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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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    The decision of landfill leachate treatment
    (Publishing House of Lviv Polytechnic National University, 2017) Huhlych, Serhiy; Malovanyy, Myroslav; Dyachok, Vasil; Lviv Polytechnic National University
    This work is an attempt to analyze the theoretical and practical aspects of landfill leachate treatment and analyze the pros and cons of the most widespread methods leachate treatment and suggest the method of complex purification of high-concentration sewage waters from solid domestic wastes (SDW) for example of Hrybovychi municipal solid domestic waste.