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Optimum Conditions for Applying the Magnetic Absorption Methodfor Decontamination of Ferrous Sulphate and Chromate-Containing Wastewater

Radovenchyk Vyacheslav, Ivanenko Olena, Otrokh Olena, Overchenko Tetiana, Ivaniuta Serhii, Benatov Daniel, Frolenkova Svitlana, Hurieva Liudmyla

Journal of Ecological Engineering

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2024

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Vol. 25, nr 5

321--334

EN

The article deals with the acute issue of intensive contamination of surface and underground waters with iron and chromium ions, which reduces the amount of water suitable for consumption. It was noted that because of monitoring the state of transboundary rivers of Ukraine within the framework of bilateral agreements, an unacceptable excess of the content of heavy metal ions was recorded. The main polluters of the water environment are machinebuilding enterprises that discharge untreated or insufficiently treated metal-containing wastewater from the processes of steel etching, chrome plating, etc. Recently, the processing of these solutions to obtain a suspension of highly dispersed particles with magnetic properties–magnetite has been increasingly practiced. One of the directions of its use is the sorption of various pollutants in water environments, i.e., the application of the magnetic absorption method. Our study shows the advantages of using magnetite obtained from sulphate solutions in comparison with the traditional sulphate-chloride solution, the influence of the ratio of iron (II) and (III) ions, temperature, pH, nature of the precipitant, salinity on the dispersion of the obtained magnetic particles. When applying the magnetic absorption method, it was determined that hydrolyzed forms of iron (III) ions are best sorbed on magnetite, the removal process of which from aqueous solutions occurs quite intensively during the first two minutes. During the study of various samples of magnetite, it was established that in acidic solutions, with an increase in the ratio of iron (II) and (III) ions, the efficiency of iron ion removal decreases; in neutral and alkaline solutions, such a dependence is not observed. In the proposed technological scheme, purifying wastewater containing 10–100 mg/dm3 of iron ions is advisable by adding 100–1000 mg/dm3 of magnetite suspension and alkali solution to a pH of 8–9. The study showed that during the treatment of chromate-containing waters with magnetite, in addition to the processes of reduction of chromate ions, oxidation of surface Fe2+ ions to Fe3+, sorption of Cr3+ ions or Cr(OH)3 hydroxides, the reduction of chromate anions on its surface is observed, the basis of which may be the formation chemical compounds, as well as the sorption mechanism. The optimal conditions for removing chromium (VI) compounds from model solutions are to conduct the process at an elevated temperature and use magnetite with a 20 mg per 1 mg Cr6+ consumption.

2

Water Softening Systems of Low and Medium Capacity

Radovenchyk Iaroslav, Hordiienko Kateryna, Radovenchyk Vyacheslav, Overchenko Тatiana, Ivanenko Olena, Krysenko Tamara, Sirenko Lyudmila

Ecological Engineering & Environmental Technology

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2024

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Vol. 25, iss. 12

194--202

EN

The current state of the hydrosphere is largely determined by human anthropogenic activities. Discharge of polluted waste waters into surface water bodies significantly worsens their quality and limits the possibility of safe consumption. One of the biggest sources of increasing surface waters mineralization and hardness is the discharge of spent regeneration solutions of natural waters ion-exchange softening processes, which creates a closed circulation cycle of sodium, calcium and magnesium chlorides. The necessity to reduce the intensity of this cycle and decrease environmental pollution is very actually today. The research of traditional soda-sodium softening technology has shown its low suitability for low and medium capacity systems due to necessity of water heating and subsequently pH adjusting. More acceptable solution was found in using phosphate anions as a precipitant, which ensures high efficiency in removing calcium and magnesium ions at a wide range of temperatures and pH levels. It was found that the solid phase formed during such treatment was difficult to separate from the liquid phase. Using of anionic flocculants was proposed as one of the solutions of this problem, which ensure high efficiency in separating the formed solid particles from water. Proposed technological scheme was designed for implementation as a pre-treatment stage in reverse osmosis systems of low and medium capacity.

3

Developmet the complex technology for highly concentrated acid solutions of electroplating industry

Ivanenko Olena, Dovholap Sergii, Nosachova Yuliia, Plashykhin Sergii, Pavliuk Nonna, Skladannyy Denys

Architecture Civil Engineering Environment

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2024

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Vol. 17, no. 1

83--90

EN

The paper presents the results of research on the application of ion-exchange processes for the extraction of iron (II) and copper (II) ions from liquid acid wastes of electroplating production. In the course of experimental studies, it was shown that with an increase in the concentration of sulfuric acid, the total exchangeable dynamic capacity (TEDC) of the cationite significantly decreases both during the sorption of iron ions and during the sorption of copper ions. At the same time, an increase in the iron (II) ions concentration leads to a significant increase in TEDC - even with a sulfuric acid concentration of 8-13 g/dm3, TEDC reached the level of 1.35 g-eq/dm3, which corresponds to the sorption level of neutral dilute solutions. However, it can be seen from the total concentration that the efficiency of sorption of metals from acidic solutions remains quite high and increases with the increase of the initial total content of sorbed ions. The main indicator used when choosing an ion exchange method is the possibility of effective regeneration of the cation exchange material. When using a 5% solution of sulfuric acid already at the specific consumption of the regeneration solution, it was possible to achieve a degree of regeneration at the level of 95-98%, and when using a 10% solution, the degree of regeneration reached 100%. According to the research results, a technological scheme for processing regeneration solutions by precipitation of metals from regeneration solutions into magnetites in a ferritizer reactor was proposed.

4

Assessment of environmental risks from pollution by toxic emissions in heat treatment process of electrode production

Ivanenko Olena, Vahin Andrii, Shabliy Tetyana, Tereshchenko Oksana, Shvachko Denis, Plashykhin Sergii, Pavliuk Nonna

Architecture Civil Engineering Environment

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2024

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Vol. 17, no. 3

97--106

EN

The purpose of this work is to assess the risks to the health of the population living in the zone of influence of emissions of pollutants into the atmospheric air from the operating enterprise for the production of carbon electrodes and to generalize the experience of applying the procedure for assessing risks and damage to the health of the population in the system of new monitoring and management mechanisms air quality. The risk assessment of the impact of planned activities on the health of the population from atmospheric air pollution was carried out based on the risk calculations of the devel-opment of non- carcinogenic and carcinogenic effects. During the assessment of the risk to public health from the emissions of the enterprise for the production of carbon electrodes, carbon monoxide was identified as one of the priority pollutants, to reduce the emissions of which it is proposed to use catalytic methods in the furnaces for firing and graphitizing carbon electrodes. Based on the results of the conducted research, it is proposed to introduce technologies that will allow to achieve the maximum permissible emissions of pollutants into the atmosphere during heat treatment.

5

Alternative Ways of Extracting Oil from Water Bodies

Shabliy Tetyana, Ivanenko Olena, Vozniuk Marta, Snigur Oleksandr, Kozhan Olexei, Nosachova Yuliia

Journal of Ecological Engineering

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2023

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Vol. 24, nr 11

127--134

EN

The article compares the use of sorption and sorption-coagulation methods for cleaning fresh and mineralized oil-containing waters. The sorbents used are thermally expanded graphite obtained by heat treatment of graphite bisulfate in a boiling layer, and activated carbon of BAU-A grade, which is widely used for purification of liquid media from oils and oil products. As an alternative to the sorption method, research was conducted on the application of the sorption-coagulation method with the simultaneous use of aluminum-containing coagulants: aluminum sulfate and aluminum hydroxochloride and activated carbon. It is shown that the advantages of using the sorption method using thermally expanded graphite are based on the high efficiency of oil extraction from water bodies and multiple regeneration of the spent sorbent.

6

Removal of Iron Compounds from Mechanical Filters of Household Reverse Osmosis Systems Water Purification

Radovenchyk Iaroslav, Ivanenko Olena, Karpenko Victorivna Margaryta, Radovenchyk Vyacheslav

Ecological Engineering & Environmental Technology

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2023

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Vol. 24, iss. 6

163--172

EN

Today, the most convenient and widespread option for cleaning and purifying drinking water is to install reverse osmosis systems directly at the water intake points. When operating reverse osmosis systems, most owners are not concerned about the negative consequences of using such systems. After 3–6 months of using mechanical filters in the first stage of water treatment, such filters are thrown out together with other household waste. They pose a significant threat to the environment. Currently, companies in Ukraine would not collect and dispose of such filters. This direction is undeveloped. There are no corresponding data in the scientific literature. According to authors’ calculations, about 20,000 household reverse osmosis systems are operated per 1 million people today, so it is easy to calculate that 44,000 cartridges with a total polypropylene volume of 26 m3 enter the environment during the year. It is difficult to imagine the real environmental damage from the cartridges of even one city. Therefore, the regeneration of mechanical filters of reverse osmosis systems is quite relevant and essential today. This work aimed to develop an environmentally safe technology for regenerating mechanical filters with the possibility of repeated use. Filter lifespan can be prolonged by special cleaning with sulfuric acid with a fixed pH level. This article highlights the research results on the regeneration the mechanical filters, describes the characteristics of the cleaning process using sulfuric acid and shows the options for environmentally safe waste processing from such regeneration.

7

New approaches to comprehensive electrochemical processing of sulfate-chloride high-mineralized wastewater treatment residues

Shabliy Tetyana, Ivanenko Olena, Plashykhin Sergii, Pavliuk Nonna, Safiants Artem, Sidorov Dmytro

Architecture Civil Engineering Environment

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2023

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Vol. 16, no. 3

171--180

EN

The results of electrochemical processing of spent acidic, neutral, and alkaline sulfate-chloride-containing regenerative solutions in two- and three-chamber electrolyzers are presented. It has been determined that the highest current efficiency for the products of electrodialysis can be achieved in the presence of hardness ions when processing acidic sulfate-containing solutions using three-chamber electrolyzers. It has been established that during electrodialysis of alkaline solutions after regeneration of anionites containing chloride ions, accumulation of alkali occurs in the cathodic region, and in the anodic region, chloride ions accumulate due to diffusion through the anion exchange membrane during the first stage, followed by preferential oxidation of chloride ions with liberation of free chlorine during the second stage. It has been shown that electrodialysis can effectively solve the problem of comprehensive processing of neutral, alkaline, and acidic regenerative sulfate-chloride-containing solutions, with the production of alkali and acid at concentrations suitable for reuse in regeneration processes.

8

Development of New Water Deoxidization Systems for Heat and Power Plants

Shabliy Tetyana, Gomelya Mykola, Pohrebennyk Volodymyr, Ivanenko Olena, Nosachova Yuliia

Journal of Ecological Engineering

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2022

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Vol. 23, nr 1

193--205

EN

The analysis of water conditioning methods for closed water supply systems was carried out in the work. The expediency of using redoxites based on ion exchange materials to combat the corrosion processes in water recirculation systems by preliminary deoxidation of water was shown. Modified KU-2–8, Dowex Mac-3, AB-17–8, Dowex Marathon WBA, AMBERLITE IRA 96 ion exchange resins were used as deoxidizing materials.

9

Use of Metal Oxide-Modified Aerated Concrete for Cleaning Flue Gases from Carbon Monoxide

Ivanenko Olena, Gomelya Nikolai, Shabliy Tetyana, Trypolskyi Andrii, Nosachova Yuliia, Leleka Serhii, Trus Inna, Strizhak Peter

Journal of Ecological Engineering

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2021

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Vol. 22, nr 5

104--113

EN

The necessity of development of technical solutions that will allow to reduce carbon monoxide emissions of flue gases of industrial productions is substantiated. It is shown that the most rational design solution to the problem of carbon monoxide pollution during the firing of electrode blanks is the use of aerated concrete blocks with a catalyst, which can be quickly and conveniently located directly on the carbon material of the “green” electrodes pouring in the subfloor space of the firing furnaces. Modified by oxides of Mn4+, Fe2+, Fe3+, Cu2+, Cr3+ -catalysts based on aerated concrete were obtained. It is shown that in an empty reactor in the temperature range 200–400 °С the degree of conversion of carbon monoxide in the absence of a catalyst is zero. It is established that on the investigated catalysts based on aerated concrete 100% oxidation of carbon monoxide is achieved at a temperature of 390 °C in the case of using a mixture of catalyst powders 30% CuO + 70% MnO2, 40% CuO + 60% MnO2, 50% Fe (FexCr1-x) 2O4 + 50% MnO2; 50% Fe3O4 + 50 % MnO2. It is determined that the addition of ferrite catalyst powder in aerated concrete in a mixture or without manganese dioxide does not critically affect the mechanical properties of the products.

10

Development of a Catalyst for Flue Gas Purification from Carbon Monoxide of Multi-Chamber Furnaces for Baking Electrode Blanks

Ivanenko Olena, Trypolskyi Andrii, Gomelya Nikolai, Karvatskii Anton, Vahin Andrii, Didenko Olga, Konovalova Viktoria, Strizhak Peter

Journal of Ecological Engineering

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2021

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Vol. 22, nr 1

174--187

EN

The catalysts based on natural zeolite-clinoptilolite of Sokyrnytsia deposit modified with oxides of Mn4+, Fe2+, Fe3+, Cu2+, Cr3+ were synthesized. It was determined that 100% conversion of carbon monoxide was achieved at a temperature of 390°C when using the copper-manganese-oxide catalyst (30% CuO + 70% MnO2). It was shown that although the use of the manganese-oxide catalyst provided 92.8% of CO conversion degree, this catalyst had the most advantages for application compared to the other studied solids. The structural parameters of the manganese-oxide catalyst were determined using XRD, SEM, and nitrogen adsorption. The composition of the main elements of the catalyst samples was determined by micro-X-ray spectral analysis. It was shown that using the catalyst containers in chambers heated by flue gases in the fire channels of a multi-chamber furnace for baking of electrode blanks can be one of the constructive solutions to the problem of flue gas purification from carbon monoxide. The environmental safety of the copper-manganese-oxide catalyst application for the treatment of the flue gases of electrode production is justified by obtaining a catalyst from spent sorbents for purification of the manganese-containing natural water and its non-toxicity in the case of burial or storage in landfills.

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Assessment of the Effect of Oxygen and Carbon Dioxide Concentrations on Gas Evolution During Heat Treatment of Thermoanthracite Carbon Material

Panov Yevgen, Gomelia Nikolai, Ivanenko Olena, Vahin Andrii, Leleka Serhii

Journal of Ecological Engineering

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2020

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Vol. 21, nr 2

139--149

EN

The processes of the interaction of carbon material (thermoanthracite pouring) with a gas-air mixture in a heat chamber were studied while heating to 800–850°C. The influence of temperature, oxygen and carbon dioxide concentration on the formation efficiency of carbon monoxide, carbon dioxide, hydrogen and methane was determined. A pilot plant was created, which provided heating of the carbon material at the indicated temperatures and regulating the supply of air and carbon dioxide. It was found that a noticeable oxidation of the carbon material in the heat chamber in the presence of oxygen or carbon dioxide occurs at the temperatures above 500°C. Significant concentrations of carbon monoxide were formed at temperatures of 600–800°C. It was shown that when using gas mixtures with an oxygen content of 7–21% minimum concentrations of carbon monoxide are formed at an oxygen content of 14%. At temperatures above 500°C, the formation of hydrogen and methane in gas flows was noted. The methane yield increased with the decreasing oxygen content.

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Application of Potassium Ferrate in Water Treatment Processes

Ivanenko Olena, Shabliy Tetyana, Nosachova Yuliia

Journal of Ecological Engineering

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2020

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Vol. 21, nr 7

134--140

EN

The paper presents the results of the investigation on the efficiency of the potassium ferrate application in water conditioning processes: oxidation of pollutants of different composition by ferrate compounds; clarification of model solutions by coagulation; reduction of corrosive aggressiveness of aqueous solutions. The optimal conditions for the water clarification process using potassium ferrate were: reagent dose 1 mg∙dm-3, pH close to neutral, and temperature 20°C. The oxidation rate of organic substances by the potassium ferrate solutions was 50% when applied in concentrations of 15-20 mg∙dm-3. The studies on the possible application of the reagent as a steel corrosion inhibitor in neutral aqueous media were conducted. The degree of corrosion protection reached 60%, which indicated the prospect of using iron (VI) compounds as inhibitory additives.