https://sci.ldubgd.edu.ua/jspui/handle/123456789/10257 2026-04-04T18:25:14Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/15622 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 https://sci.ldubgd.edu.ua/jspui/handle/123456789/13437 Title: ВПЛИВ НВЧ-ОПРОМІНЕННЯ НА СОРБЦІЙНІ ВЛАСТИВОСТІ ГЛАУКОНІТУ В ПРОЦЕСАХ ВОДООЧИЩЕННЯ Authors: Федів, Ірина Сергіївна Abstract: Clays are progressive and functional materials known for their high adsorption capacity. Microwave technology offers a reliable approach for the rapid and efficient synthesis and modification of clays used in water purification. Microwave technology enables the modification of clays by facilitating dealumination, desilication, and cation exchange processes. Microwave synthesis ensures fast reaction rates, homogeneous product formation, and the creation of ordered mesoporous structures. The chemical activity of clays depends on their surface area, and microwave irradiation is faster and more efficient in ion exchange compared to traditional processing methods 2023-01-01T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/13158 Title: Adsorption of Ammonium Ions and Phosphates on Natural and Modified Clinoptilolite: Isotherm and Breakthrough Curve Measurements Authors: Степова, Катерина Вікторівна; Федів, Ірина Сергіївна; Mažeikiene, Aušra; Šarko, Julita; Mažeika, Jonas Abstract: The research focuses on ammonia and phosphate removal from wastewater by using a novel metal and microwave-treated clinoptilolite. For increasing adsorption capacity, the samples were calcinated or microwave irradiated in the solutions of Fe(III), Cu (II), or Ca(II) chlorides. BET-specific surface area measurement revealed that the calcination led to a decrease from 18.254 to 11.658 m2/g. The adsorption results were fitted to theoretical models. The PO43− adsorption in all samples as well as NH4+ adsorption in natural and Fe- and Ca-modified samples is best described using the Langmuir–Freundlich model, but in calcinated and Cu-modified clinoptilolite the NH4+ sorption is better characterized by the Freundlich model. The PO43− adsorption in natural and all modified samples is best described using the Langmuir–Freundlich model. Fe-modified and calcinated clinoptilolite showed the highest NH4+ adsorption capacity of 4.375 and 2.879 mg/g. Ca-modified samples demonstrated the lowest adsorption capacity of 0.875 mg NH4+/g. The metal-modified samples exhibit a significantly higher phosphate sorption capacity (from 800.62 for Cu-sample to 813.14 mg/g for the Fe-modified sample) than natural (280.86 mg/g) or calcinated samples (713.568 mg/g). Experimental studies in dynamic conditions revealed high NH4+ and sufficient PO43− ions captured on modified clinoptilolite. This study provides a feasible approach for the synchronous removal of the main eutrophication agents for implementation in additional (tertiary) wastewater treatment facilities. 2023-01-01T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/13157 Title: Removal of Eutrophication Agents from Wastewater Using Glauconite-Based Sorbents Authors: Степова, Катерина Вікторівна; Федів, Ірина Сергіївна; Mažeikienė, Aušra; Кордан, Василь; Paliulis, Dainius Abstract: Excessive phosphorus and nitrogen in water and sediment may cause eutrophication, which poses a potential risk to drinking water safety and the sustainability of aquatic ecosystems. The research focuses on the removal of phosphates and ammonium ions from aqueous solutions using a new thermally and microwave-treated glauconite. The surface morphology of the samples was studied by SEM. BET surface area, pore volume, and pore size distribution were measured. Adsorption studies were carried out in static and dynamic conditions. The best fit for adsorption of the both pollutants is given by Langmuir-Freundlich and BET models. The calcined sample showed the lowest adsorption capacity for phosphate but the highest capacity for ammonium. Conversely, for the microwave-irradiated sample, the adsorption capacity for phosphate increases, while that for ammonium remains at the same level. In dynamic conditions phosphorus was most efficiently retained by natural glauconite, and ammonium nitrogen by glauconite that was thermally treated in a muffle furnace. 2023-01-01T00:00:00Z