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Assessment of the impact of operational parameters on the efficiency of reverse osmosis systems

(КПІ ім. Ігоря Сікорського, 2025) Karpenko, Rostyslav; Gomelya, Mykola

This paper addresses the pressing issue of water quality assurance under increasing anthropogenic pressure. The efficiency of reverse osmosis (RO) technology for water purification, particularly in the pharmaceutical industry, is analyzed. Data concerning the impact of key operational parameters (pressure, recovery rate) and physico-chemical characteristics of feedwater (pH, hardness, alkalinity) on membrane purification efficiency are systematized. Particular attention is given to the problems of membrane scaling, especially in regions with high concentrations of hardness salts. Methods for assessing water's scaling tendency (LSI, SDI indices), monitoring strategies, and water pre-conditioning, including antiscalant dosing (phosphonates, polyacrylic acid) and pH adjustment, are examined. Modern approaches to optimizing RO systems, such as the use of digital twins and hybrid technologies (RO-UV, RO-ED), which contribute to improved purification quality, energy efficiency, and reduced fouling risks, are also highlighted. Recommendations are proposed for optimizing operational parameters, developing water stability assessment methodologies, and implementing monitoring systems to ensure the long-term efficiency of reverse osmosis systems.

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Comprehensive environmentally safe water treatment technologies

(Primedia eLaunch, 2021) Trus, Inna; Halysh, Vita; Nikolaichuk, Alina; Gomelya, Mykola; Krysenko, Tamara

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Dependence of corrosion activity of aquaticpetroleum mixtures on characteristics of aquatic environments

(КПІ ім. Ігоря Сікорського, 2022) Homenko, Anna; Gomelya, Mykola; Мakarenko, Iryna; Shabliy, Tetiana

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Development of a waste-free technology of mine water desulphatization involving the use of lime and Aluminium coagulants

(SPC “Sci-conf.com.ua”, 2020-04) Trus, Inna; Radovenchyk, Iaroslav; Nosachova, Julia; Hlushko, Olena; Gomelya, Mykola; Vozna, Ivanna

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Effective solution of the problem of utilization of plant waste in the interest of ecology

(SPC “Sci-conf.com.ua”, 2020-06) Trus, Inna; Halysh, Vita; Gomelya, Mykola; Vozna, Ivanna; Ivanenko, Olena; Krysenko, Tamara

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Evaluation of the efficacy of alkylimidazolines in reducing the corrosion aggressiveness of oilcontaining waters

(КПІ ім. Ігоря Сікорського, 2022) Homenko, Anna; Gomelya, Mykola; Shabliy, Tetiana

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Influence of fractional composition on sorption capacity of walnut shells

(WayScience, 2020-06-08) Kovalchuk, A.; Pochechun, T.; Halysh, Vita; Trus, Inna; Radovenchyk, Iaroslav; Gomelya, Mykola

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Infrared spectroscopy in the research of structural features of membranes made of modified cellulose fiber

(КПІ ім. Ігоря Сікорського, 2025) Mylokost, Sergii; Halysh, Vita; Gomelya, Mykola

This study explores the use of modified cellulose membranes for water purification, focusing on the removal of color from sodium humate solutions. Cellulose, a renewable and eco-friendly polymer, was modified with a 1:1 mixture of monoethanolamine and epichlorohydrin at consumption of 5%, 10%, and 15%. The membranes (80 g/m2) were tested on 100 mg/dm3 sodium humate solutions. Color removal efficiency was highest (98%) with the 15% modified membrane. The infrared spectra confirmed successful modification by the appearance of a peak at 1598 cm-1. The results demonstrate the potential of chemically modified cellulose membranes for sustainable water treatment applications.

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Phosphorylation of lignocellulose for the purpose of wastewater treatment

(SPC “Sci-conf.com.ua”, 2021-07) Halysh, Vita; Trus, Inna; Deykun, Iryna; Benatov, Daniel; Ploskonos, Victor; Gomelya, Mykola; Vozovych, Anton; Horianoi, Volodymyr

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Production of active chlorine and sodium hypochlorite in a closed electrolyser

(КПІ ім. Ігоря Сікорського, 2024) Gomelya, Mykola; Kryzhanovska, Yana; Pliatsuk, Yana

Today, in the conditions of warfare, there is constant local pollution of the environment due to the use of explosives, fires, spillage of fuel and lubricants, etc. Every day, the danger increases when the water drainage systems of various enterprises are damaged, such as mining enterprises, facilities of the energy, metallurgy, chemical, petrochemical industries, sludge storage facilities for highly toxic waste. Next to this, there is a growing problem of highly efficient purification of water, primarily drinking water. As a result of the destruction of the Kakhovsky reservoir in 2023, the problem of disposal of mine waters, which are characterized by a high level of mineralization, a significant content of iron, manganese and other toxicants, has sharply worsened. In this case, there are no water resources for diluting mine waters before their discharge. Despite a significant number of developments in the field of water quality control and water purification technologies, a number of problems in this direction remain unresolved. Existing technologies are ineffective when the levels of mineralization and water hardness are exceeded. We are talking about the southern regions of our country and Donbas. In Mykolaiv, after the aggressor reduced the water intake on the Dnieper, the centralized water supply system supplies brackish water from the estuary. It is known that concentrated salt solutions, which are formed and are still present next to the problems described above, are practically not processed. In most cases, they are dumped into the surface reservoirs of the surrounding natural environment, which significantly worsens the state of water ecosystems of Ukraine. The situation is worsened by the fact that a significant part of mine water suitable for use, due to the problem of disposal of concentrates, is not used, but is discharged into the environment after dilution, or even without dilution and purification, since there is simply no resource for dilution in today's realities. That is why, the problem of processing concentrates of baromembrane purification with obtaining secondary useful products was the aim of the research of this work.

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Removel of iron from water by oxidation on magnetite

(Одеська національна академія харчових технологій, 2021-03) Tverdokhlib, Mariia; Gomelya, Mykola; Shabliy, Tetyana

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Sorbent-Catalyst for Acceleration of The Iron Oxidation Process

(Polish Society of Ecological Engineering (PTIE), 2021) Gomelya, Mykola; Tverdokhlib, Mariia; Shabliy, Tetyana; Radovenchyk, Vyacheslav; Linyucheva, Olga