Environmental Problems

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Author: search.filters.author.Petrushka, KaterynaSubject: search.filters.subject.ecological safety

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    Features of adsorption processes for wastewater treatment from zinc ions
    (Видавництво Львівської політехніки, 2021-06-01) Petrushka, Ihor; Bratus, Oksana; Petrushka, Kateryna; Lviv Polytechnic National University
    The results of adsorption properties of complex natural sorbents in relation to the neutralization of zinc ions from wastewater are presented. The adsorption isotherm of Zn2+ ions on complex sorbents (clinoptilolite-shungite) (1:1) according to Langmuir and Freundlich models is constructed, the type of adsorption isotherms according to S. Brunauer classification is established. The value of the maximum sorption capacity of Gmax complex sorbents for Zn2+ ions is calculated. The peculiarities of the sorption process of zinc ions with the formation of a monomolecular layer based on the calculated coefficients of the Langmuir and Freundlich were found. The optimal conditions for the dependence of the degree of absorption of Zn2+ ions by complex sorbents on the duration of the sorption process are determined. The ratio “solid (complex sorbent) – liquid” was determined experimentally.
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    Socio-psychological essence of attractiveness for the subjects of entrepreneurial activities of adsorption extraction of Nickel ions (II) by bentonite clays
    (Lviv Politechnic Publishing House, 2019-02-26) Sakalova, Halyna; Palamarchuk, Olha; Vasylinycz, Tamara; Petrushka, Kateryna; Zaharko, Jaroslava; Stocaluk, Oleh; Vinnytsia State Pedagogical University named after Mykhailo Kotsiubynsky; Lviv Polytechnic National University; Lviv State University of Life Safety
    The article considers an actual but not sufficiently developed problem of attractiveness for the subjects of entrepreneurial activity of adsorption extraction of Nickel ions (II) by bentonite clays. The basic social and psychological mechanisms for the adoption of environmentally-oriented activities are analyzed. The styles of entrepreneurs’ response to the attractiveness of adsorption extraction of Nickel ions (II) by bentonite clays are characterized. The process of sorption of Nickel ions (II) with a fixed layer of sorbent by bentonite clays is investigated. The main advantages of using bentonites in water treatment technologies are described: powerful geological reserves, cheap rock formation, simple preparation for transportation and use, the possibility of using spent sorbents in other technologies, eliminating the need for expensive regeneration. The influence of different factors (length of the process, layer of the adsorbent) on the degree of wastewater treatment from Nickel ions, influence of pumping speed on dynamic capacity of the sorbent is investigated and effective volume is determined. The results of the research indicate that the use of natural mineral sorbents, in particular, the bentonite clay of Cherkassy deposit, is promising and effective for purification of waste water from Nickel (II) ions.