Ад'юнкт кафедри, капітан служби цивільного захисту https://sci.ldubgd.edu.ua/jspui/handle/123456789/8681 2026-04-12T09:46:33Z 2026-04-12T09:46:33Z Fediv, Iryna Mažeikienė, Aušra Stepova, Kateryna https://sci.ldubgd.edu.ua/jspui/handle/123456789/16163 2025-07-02T12:52:42Z 2025-01-01T00:00:00Z

Title: ADVANCED ADSORPTION MATERIALS BASED ON NATURAL MINERALS FOR WATER FILTRATION SYSTEMS IN EMERGENCY SITUATIONS Authors: Fediv, Iryna; Mažeikienė, Aušra; Stepova, Kateryna Abstract: This study investigates the efficiency of removing eutrophication agents—phosphate (PO₄³⁻) and ammonium (NH₄⁺) ions—from wastewater using natural sorbents: glauconite and clinoptilolite. The sorption capacities of natural, thermally treated, and metal-modified samples were compared. It was found that Fe- and Cu-modified samples demonstrated the highest efficiency for phosphate removal, while ammonium was better adsorbed by natural or Fe-modified clinoptilolite and thermally activated glauconite. The adsorption processes were analyzed using Langmuir-Freundlich isotherm models, allowing a detailed assessment of the interaction mechanisms between the sorbents and target ions. Experiments with real wastewater samples confirmed the applicability of these minerals in tertiary filtration systems. The findings highlight the practical value of glauconite and clinoptilolite as environmentally safe, cost-effective materials for the treatment of domestic and industrial wastewater containing eutrophication-inducing substances. Their use may significantly reduce nutrient loads entering natural water bodies and contribute to the preservation of aquatic ecosystems and environmental sustainability.

2025-01-01T00:00:00Z Федів, Ірина Степова, Катерина https://sci.ldubgd.edu.ua/jspui/handle/123456789/16140 2025-06-15T11:31:34Z 2025-01-01T00:00:00Z

Title: ДОСВІД УЧАСТІ У БІЛАТЕРАЛЬНИХ НАУКОВО-ДОСЛІДНИХ ПРОЄКТАХ, ЩО ПРОВОДЯТЬСЯ МІНІСТЕРСТВОМ ОСВІТИ І НАУКИ УКРАЇНИ У СПІВПРАЦІ З ЛИТОВСЬКОЮ НАУКОВОЮ РАДОЮ Authors: Федів, Ірина; Степова, Катерина

2025-01-01T00:00:00Z Федів, Ірина Степова, Катерина Mažeikienė, Aušra https://sci.ldubgd.edu.ua/jspui/handle/123456789/16139 2025-06-23T13:04:45Z 2025-01-01T00:00:00Z

Title: ВИКОРИСТАННЯ ЦЕОЛІТІВ ТА ГЛИН ДЛЯ ОЧИЩЕННЯ СТІЧНИХ ВОД ВІД МИЮЧИХ ЗАСОБІВ Authors: Федів, Ірина; Степова, Катерина; Mažeikienė, Aušra Abstract: У дослідженні розглядаються ефективні методи очищення стічних вод від поверхнево-активних речовин (ПАР) за допомогою природних сорбентів, таких як кліноптилоліт і глауконіт. Модифікація цих матеріалів підвищує їх адсорбційну здатність, що сприяє покращенню якості води та зниженню забруднення екосистем.

2025-01-01T00:00:00Z Fediv, Iryna Stepova, Kateryna Mažeika, Jonas https://sci.ldubgd.edu.ua/jspui/handle/123456789/15622 2025-04-09T09:14:56Z 2023-01-01T00:00:00Z

Title: RESEARCH ON AMMONIUM NITROGEN AND PHOSPHATE REMOVAL FROM WASTEWATER USING NATURAL AND MODIFIED SORBENTS Authors: Fediv, Iryna; Stepova, Kateryna; Mažeika, Jonas Abstract: The work deals with the issues of ammonium nitrogen and phosphate phosphorus removal from wastewater. Natural and modified sorbents: zeolite, glauconite, and bentonite were tested under laboratory conditions. The wastewater after biological treatment with an average ammonium nitrogen concentration of 5 mg/L and an average phosphate phosphorus concentration of 3.4 mg/L was used for experimental studies. Before the test, the phosphate phosphorus concentration in the wastewater was increased to 19.9 mg/L by the addition of potassium hydrophosphate salt. Glauconite (after 3 hours in a muffle furnace at a temperature of 550 °C) had the greatest ability to sorb phosphorus. Under the conditions of this study, the PO4–P sorption efficiency was 58%. Ammonium nitrogen from wastewater was best sorbed by natural glauconite. Under the conditions of this study, the sorption efficiency of NH4–N was 98%. The results showed that the adsorption process on glauconite could be used as an effective method for removing ammonium from wastewater.

2023-01-01T00:00:00Z