Ivan Kozyatnyk

Region Östergötland · Occupational and environmental medicine

This work developed an effective model of the cooperative removal process of organic compounds on biologically active carbon. This model involves the determination of the dynamics of adsorption efficiency and degradation of specific classes of target organic substances but also the dynamics of non-target filling of pores with products of vital micr...

This study evaluates and compares the environmental impacts arising from the disposal of different carbonaceous sorbents used for wastewater treatment. Three different adsorption materials were considered, i.e. activated carbon, biochar and hydrochar, and three end-of-life management approaches, i.e. incineration, regeneration and landfilling. The...

Humic acids (HA) represent an economic and environmental challenge in water treatment, as they have the propensity to foul membranes and create toxic by-products when interacting with chlorine. To overcome this, HA were submitted to hydrothermal carbonization to convert them into an easy to remove, valuable carbon material. The result was a carbona...

This study focused on the challenges of treating groundwater rich in dissolved organic matter and contains both heavy metals and organic pollutants. Activated carbon, fly ash, lignite, peat, torrefied organic material and zero-valent iron were tested as prospective materials for permeable barriers. Removal of different pollutants was analyzed using...

On the composition and type of groundwater pollution are divided into chemical (organic and inorganic), biological, radioactive and thermal. Chemical contamination of groundwater is the most common and difficult to remove. We will focus in this section on the removal from groundwater of chemical (organic and inorganic) and radioactive contamination...

Ground water is a source for drinking and industrial water supply and pollution created by active industrial sites often causes social, health, and environmental problems. This groundwater eventually drains into an adjacent water sources. Filtration Materials for Groundwater: A Guide to Good Practice presents the up-to-date technology of purificat...

Natural organic matter (NOM) interaction with corrosion sediments is important because it can adversely affect the behaviour of many organic and inorganic pollutants in drinking water distribution systems. NOM accumulation onto corrosion sediments can cause serious problems for water supply, such as bacteria regrowth and deterioration of water qual...

Permeable barriers are used for passive remediation of groundwater and can be constructed from a range of materials. The optimal material depends on the types of contaminants and physico-chemical parameters present at the site, as well as the hydraulic conductivity, environmental safety, availability, cost and long-term stability of the material it...

This study evaluates and compares the parameters of equilibrium adsorption from aqueous solutions of river fulvic acids (FA) and peat fulvic acids. Compared to peat FA, the river FA had lower biodegradable dissolved organic carbon (BDOC). We observed a tendency for correlation between change of Gibbs free energy of adsorption and BDOC value. A chlo...

Oxidation is well-known process of transforming natural organic matter during the treatment of drinking water. Chlorine, ozone, and chlorine dioxide are common oxidants used in water treatment technologies for this purpose. We studied the influence of different doses of these oxidants on by-products formation and changes in biodegradable dissolved...

It was studied the effect of the content of biodegradable organic carbon (BDOC) after the processes of aeration and ozonation of the fulvic acid (FA) solutions on the efficiency of its adsorption and biofiltration. It was found that the change of free energy of adsorption of the FA oxidation products correlated with the part of biodegradable organi...

The impact of ozonization on the equilibrium adsorption of fulvic acids (FA) on activated carbon has been studied. The possibility of multicomponent approach to describe the adsorption equilibrium by using two hypothetical components: weakly and strongly adsorbable fractions of FA was examined. The ozone treatment was shown to equalize the ability...

The effect of the varied content of biodegradable organic carbon (BDOC) in solutions of fulvic acids (FA) after the aeration and ozonation processes on the efficiency of adsorption and biofiltration of FA solutions through the activated carbon has been investigated. It has been found that the reduction of the BDOC fraction in FA solutions enhances...

Bioaccessibility of total organic carbon is an important factor affecting water quality in distribution systems of water supply. We have investigated the content of biologically accessible organic carbon in several types of waters (river, artesian, tap, and model) and its change in the course of water treatment by different methods. It has been sho...

The paper presents an analytical review of the possibility of combination and adsorption and the heterogeneous catalysis on the interface in the aqueous medium. Covered are issues on the heterogeneous catalysis on activated carbon in the presence of hydrogen peroxide. The paper has investigated the decomposition mechanisms of hydrogen peroxide in t...

The activated carbon (AC) bioregeneration was shown to proceed more efficiently during the filtration of preozonized tap water as compared with bioregeneration under the similar conditions during the filtration of non-ozonized water. The enhanced efficiency of AC bioregeneration after the filtration of preozonized water is determined by transformat...

We have investigated the impact of the change of the chemistry of the activated carbon surface on the parameters of equilibrium adsorption of fulvic acids from aqueous solutions on carbon in the presence of hydrogen peroxide. The article has considered the possibility of a multicomponent approach to the description of adsorption equilibrium when us...

The adsorption of fulvic acids (FA) from aqueous solutions on activated carbon (AC) with different characteristics of surface chemical state has been investigated. To characterize the adsorbability of FA with complex fractional composition, a method of estimation of modified Freundlich equation constants was employed, and "conventional component" w...

We have quantitatively assessed the impact of surface chemistry and the structure of activated carbon on adsorbability of fulvic acids from aqueous solutions. For assessing adsorption energy of different fractions of fulvic acids the method of “conditional component” was used. It has been shown that in the first approximation in the solution of ful...

The article has investigated structural characteristics and surface chemistry of activated carbon, grade KAU, at various modes of its oxidizing. Differences in the properties of obtained oxidized carbons are determined by the conditions of their oxidation. The paper has substantiated a possibility of obtaining activated carbon with set properties f...

It has been studied hydrogen peroxide influence on efficiency of fulvic acids filtration through biologically activated carbon. It has been defined rational condition of hydrogen peroxide using in processes of BAC filtration. It has been shown that using of H2O2 in concentration 5 mg/l is the most useful. Because it helps to increase oxygen content...

The ad sorp tion pa ram e ters of the ac ti vated car bon (AC) BAU and KAU-TF, which have been used for pu ri fi ca tion of tap wa ter over a long pe riod of time, are es ti mated. It is shown, that the AC with the na tive biofilm is sub jected to spon ta ne ous bioregeneration. As a re sult of this pro cess 68–96% of sur face of AC mesopores is re...

The quantitative estimation of the spontaneous bioregeneration degree of activated carbon (AC) with native biofilm is made under continuous using of the filters for drinking water purification. A number of factors is defined, which are influence on this process. The differences in bioregeneration process oh the AC are caused by its characteristics...

Interaction of low concentration (1-10 mg/l) of hydrogen peroxide with surface of activated carbon KAU in filtration was studied. Change of magnitude of static exchange capacity of activated carbon (AC) and maintenance of functional groups on surface of AC before and after filtration was also studied. It is show, that full reduction of Н2О2 by surf...

We have conducted an analytical survey in the state of the art in the technology of drinking water conditioning at the centralized water treatment facilities. We have covered the issues on the role of natural organic compounds in the formation of the quality of natural and drinking water, we have also studied the possibilities of wastewater pretrea...

The article assessed adsorption characteristics of activated carbons (BAU and KAU-TF), which have been used for purification of tap water for a long time. It is shown that activated carbon with a natural biofilm is subjected to spontaneous bioregeneration. As a result 68 to 98% of the surface of mesopores are recovered. In order to free the carbon...

We have studied the interaction of small concentrations (1-10 mg/dm 3) of hydrogen peroxide with the surface of activated carbon during filtration. We have determined the variation of the value of statistic exchange capacity of carbon and the content of functional groups on its surface before and after filtration. It is shown that complete absorpti...

The influence of combined presence of hydrogen peroxide and nonionic surfactant (polyoxyethylated octhylphenol) on the degree of surfactant sorptional extraction from water solution during filtration through activated carbon has been studied. The equations in codified variable have been got. They demonstrate the qualitative influence of different f...