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GEOCHEMICAL PECULIARITIES OF GROUNDWATER WITHIN THE TERRITORY OF LVIV TROUGH »« STABILITY INDICES AND EQUILIBRIUM CRITERIA OF CALCIUM- HYDROCARBONATE WATER SYSTEMS

POLLUTION OF NATURAL WATERS BY ARSENIC COMPOUNDS: CAUSES AND PERSPECTIVE SOLLUTIONS OF THE PROBLEM

UDC 504.06+628.16

M. Litynska, I. Astrelin, N. Tolstopalova

National Technical University of Ukraine “Kyiv Polytechnic Institute”, Kyiv

e-mail: m.litynska-2017@kpi.ua

The article substantiates the need for the removal of arsenic in drinking water treatment. Possible ways of arsenic compounds getting into natural waters and examples of characteristic arsenic substances for different geochemical and hydro-biological conditions are presented. Possible methods for removing arsenic from natural waters, including settling techniques (coagulation / filtration, lime softening and etc.), adsorption, ion exchange, membrane processes (microfiltration, ultrafiltration, nanofiltration, reverse osmosis) and others. The article shows the need to transform existing in water As(III) to As(V) and provides an overview of the possible oxidizers. Because conventional methods of arsenic removing is not effective, the development of new methods of water purification from arsenic compounds is very important. The use of compounds Fe (III) in the future may become an important part of the combined methods of arsenic compounds removing from natural waters because these compounds have oxidation and sorption properties. Perspective in the context of arsenic removing from natural waters are combinations of traditional techniques such as the adsorption / membrane filtration, the dosage of oxidants / membrane filtration, but information about present systematic research of this subject in Ukraine today is missing.

Keywords: arsenic, arsenic minerals, dearsenication, water purification.

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06.05.2016 at 3:57 pm