heavy metals

ASSESSMENT OF HEAVY METAL CONTAMINATION OF THE TECHNOECOSYSTEM OF THE KAKHOVKA MAIN CANAL OF THE KAKHOVKA IRRIGATION SYSTEM

In the present study, the authors demonstrate the accumulation of heavy metals in water and soft tissues of bivalve mollusks (Dreissena polymorphaDreissena bugensis) in the Kakhovka Main Canal within the Kherson and Zaporizhzhia regions (Ukraine) in the summer season (July–August 2018). The average metal concentrations in water decrease in the following order: Ni>Zn>Cr>Co>Cu>Cd.

Determination of competitive adsorption regularities in multi-component systems

Heavy metals in the environment are a source of some concern because of their potential reactivity, toxicity, and mobility in the soil. Zeolites have been used as a adsorbents to prevent potentially toxic metal contamination stemming from mining waste disposal. These materials are characterized by a high cation exchange capacity (CEC) and a predominance of negative charges, favoring their potential utilization in metal cation immobilization. It is widely used in laboratory research and industrial applications. Many physical and chemical processes occur at different interfaces.

INVESTIGATION OF MIGRATION OF HEAVY METALS IN THE SOIL ENVIRONMENT ON THE EXAMPLE OF COPPER SULFATE

The problem of permanent and prolonged pollution of soils by various kinds of pollutants, in particular heavy metals, was analyzed. Experimental investigations of penetration of copper sulfate into a vertical soil profile have been carried out. The adsorption capacity of the sandy environment of copper sulfate
was experimentally determined.

ECOLOGICAL AND GENETIC MONITORING OF THE AGRO - AND BIODIVERSITY OF THE COASTAL ZONE OF WESTERN GEORGIA

The intensity of heavy metals, natural and anthropogenic radionuclides are studied in the cultivated plants and soil in the vicinity of the western coast of Georgia. It is shown that the intensity of their accumulation depends on the type of plant, the place of sampling and the ecological zone. The highest rate of natural radionuclides is 40K, and the lowest - 226Ra, from the technogenic radionuclides the high-quality activeness is characterized to 137Cs, and its accumulation is the highest in the soil. From the hard metals, the plants most actively absorb lead and cadmium.

RESULTS OF THE DRINKING WATER ECOLOGICAL MONITORING ON THE TERRITORY OF THE AJARA AUTONOMOUS REPUBLIC

The research represented in the given work concerns studying the organoleptic, chemical and microbiological indicators in the drinking water on the territory of the Ajara Autonomous Republic. Particularly, among the organoleptic indicators the scent, taste and color of the drinking water have been
determined; as for the chemical indicators – pH, ammonia and nitrite- and out of the heavy metals – lead, arsenic, cadmium and zinc have been determined.

ALTERNATIVE USE OF FALLEN LEAVE SUBSTRATES IN VERMICULTURE

Today there is a need for the development of new technologies of waste utilization, especially biowaste such as fallen leaves because it can accumulate a variety of harmful compounds, including heavy metals. One of the methods of its processing is composting. On the other hand, these leaves can be used to improve soil condition by bioconversion. Actually, a promising way for the realization of this problem is the use of vermiculture technology with the addition of red Californian earthworms.

DYNAMIC OF ADSORPTION SEPERATION OF Сu2+AND Сr3+ CHROMIUM (ІІІ) IONS IN THE FIXED-BED COLUMN

The article presents experimental studies of the adsorption capacity of zeolite in relation to Cu2 + and Сr3 + ions in a column type apparatus. The comparison of theoretical calculations and the results of experimental studies of the process of compatible adsorption of copper and chromium ions on zeolite in dynamic conditions was presented. Experimental data of dynamics of adsorption of ion of cuprum and chromium zeolite in a column type apparatus were presented. The exhaustion time and breakthrough time for different sorts at different bed depth have been set.

ADSORPTION OF Cu (II) and Cr (III) IONS FROM AQUEOUS MEDIUM IN FIXED BED COLUMN

The adsorption of Copper (II) and Chromium (III) from aqueous solution by natural zeolite was investigated in fixed bed column. The effects of selected operating parameters such as flow rate and bed depth were evaluated. The breakthrough data are fitted well to Bed Depth Service Time (BDST) and Thomas models with high correlation coefficient, R2 = 0,91. The results showed that zeolite can be an effective adsorbent for Copper (II) and Chromium (III) removal.

RESEARCH OF MIGRATION PATTERNS OF HEAVY METALS IN THE SOIL ENVIRONMENT IN THE AREA OF PHOSPHOGYPSUM STORAGE INFLUENCE

The paper is focused on the research of migration process of heavy metals in the soil environment in the area of phosphogypsum storage in Sumy region. In the profile of the gray forest soils the corresponding genetic horizons were identified. The various structures of compounds containing heavy metals were detected in the samples by the diffractometric analysis. The increased gross content of lead in comparison with the background concentration in allocated humus and illuvial horizons has been determined.

SORPTION PURIFICATION OF NATURAL WATER FROM MICRO-MIXTURES OF HARD METALS

The research determines the efficiency of the use of activated carbon in the process of water purification from heavy-metal ions for technological purposes in the food industry. Comparative studies of the use of sorbents of various types of activated carbon have been carried out. The study determines the factors that influence the efficiency of drinking water purification from heavy metal ions through activated carbon. It also proves the highest efficiency of oxidized form of activated carbon